In the realm of materials scientific research, where the alchemy of warmth changes base elements right into the foundation of human being, there exists a vessel that stands as the guard of pureness. The Alumina Ceramic Crucible is not just a container; it is the guardian of the molten state, the silent witness to the birth of semiconductors, superalloys, and the rarest earths. For centuries, humanity has actually battled to include fire, often shedding the fight as steel rusted the clay or heat smashed the vessel. We saw a world limited by the delicacy of its tools, where the search of high-temperature processing was shackled by the worry of contamination. This is the tale of exactly how we utilized the crystalline structure of nature to redefine the limits of thermal endurance. We stand at the vanguard of refractory innovation, where the control of light weight aluminum oxide dictates the efficiency of smelting and the durability of commercial cycles. Our brand name was born from the realization that the service to extreme warm did not depend on thicker walls, however in the pureness of the atomic latticework. We sought to present resilience to the inferno, showing that by perfecting the ceramic bond, we can construct a future where temperature is no longer an obstacle to advancement. This is the story of control, pureness, and the fragile equilibrium needed to hold the sunlight in our hands. It is a testament to the power of porcelains to solve the thermal issues of the universe.

(Alumina Ceramic Crucible)

Brand Beginning: The Sorcerer’s Dilemma

Our story starts not in an immaculate research laboratory, however in the disorderly warm of early industrial foundries where the odor of liquified steel was a consistent reminder of the limitations of refractory materials. The creators were disappointed by the typical techniques of crucible building, where graphite eroded into the melt and silica leached impurities into the alloy. They recognized that the secret to pureness lay in chemical inertness, however this created a brand-new issue: a material that might hold up against the heat but ruined under thermal shock. The obstacle was to make a ceramic that was not simply warm immune, but unsusceptible the hostile nature of molten metals. This mystery became our fascination. We pulled away right into the research and development facility, driven by the idea that the solution lay in the mineral diamond. We were established to discover a product that was not simply a container, but a guard that safeguarded the honesty of the melt. We understood that the future of high-temperature applications relied on a crucible that can assure outright purity.

The Genesis of Pureness. The very early days were defined by unrelenting testing. Numerous kiln cycles were run, and thousands of examples were smashed as we looked for the excellent microstructure. We were searching for a density that might stop infiltration while keeping the sturdiness to make it through fast heating. The breakthrough came when we turned our focus to the bit size circulation of our basic materials. We realized that by controlling the penalties and the crude portions, we might achieve a green thickness that converted into a completely thick discharged body. It was a Eureka minute that enabled us to develop a crucible that functioned not simply on the surface, but within the very pores of the ceramic. We had actually split the code of thermal shock resistance, verifying that by regulating the grain boundaries, we can accomplish higher toughness. This exploration noted the birth of our brand name, a brand name committed to redefining the really significance of high-temperature containment.

Core Process: Creating the Fire

The development of our Alumina Ceramic Crucible is not an issue of molding and shooting; it is a precise orchestration of resources selection and thermal profiling. It is a process that requires outright control, where the dimension of a grain or the price of air conditioning can mean the difference between a high-performance crucible and an ineffective lump of clay. We do not make products; we engineer options at the microstructural level. We resource the greatest pureness alumina powders, ensuring that every bit is without iron and silica pollutants that might leach right into the thaw. Our exclusive mixing procedure makes sure an uniform mix that guarantees consistent performance throughout the crucible wall surface. We make use of sophisticated creating methods, consisting of isostatic pressing and slip casting, to accomplish the complicated geometries called for by our clients without compromising the thickness of the material. Whether we are creating a tiny lab crucible or a massive commercial vessel, every form is monitored with armed forces precision. Pressure, dwell time, and mold and mildew release are regulated to guarantee uniformity. When the creating is total, the green ware is dried and subjected to a shooting cycle that is the heart of our process. We use high-temperature kilns that get to over 1600 levels Celsius, where the alumina fragments undergo sintering to create a strong, monolithic structure. This firing profile is a closely guarded trick, established over decades of trial and error. It ensures that the final product has the ideal equilibrium of density, stamina, and thermal conductivity. Every single crucible is after that based on strenuous quality control tests. We measure the dimensional accuracy, the thickness, and the chemical composition. Only when a crucible passes every single examination does it gain the right to birth our logo design. This dedication to high quality makes sure that when an engineer puts their precious merge our crucible, they are putting it into a vessel of outright integrity.

The Scientific research of Inertness. At the heart of our modern technology exists the concept of chemical stability. The molecular framework of aluminum oxide is naturally immune to reaction with many molten steels and slags. Our designers adjust the shooting ambience to guarantee that the grain boundaries are devoid of lustrous phases that could function as a flux. It is this precise manipulation of the ceramic matrix that offers our Alumina Porcelain Crucible its ability to resist corrosion and disintegration. We do not just develop vessels; we create a guard of atoms.

( Alumina Ceramic Crucible)

Accuracy Design and Quality Control. The manufacturing procedure begins with the mindful selection of high-purity alumina hydrate. This is subjected to a collection of calcination actions to get rid of the chemically bound water and transform it to alpha alumina. We make use of advanced milling techniques to accomplish the desired particle dimension circulation. We then add proprietary binders and dispersants to produce a slurry that streams perfectly into our mold and mildews. Once the developing is complete, the eco-friendly ware is dried out gradually to avoid splitting. The shooting cycle is one of the most crucial action. We make use of a regulated ramping routine that enables the binders to stress out slowly without producing internal stress and anxieties. The height temperature is held for a certain time to make sure full sintering. Once cooled down, the crucibles are examined for any surface area defects. We then perform non-destructive testing, consisting of ultrasound scans, to make sure there are no interior voids or laminations. Only the ideal crucibles are selected for delivery. This level of scrutiny makes sure that our product satisfies the highest standards of reliability.

The Art of Application. We understand that an Alumina Porcelain Crucible is not simply used for melting steels. It is a flexible vessel that discovers application in crystal development, glass handling, and even nuclear research. Therefore, our core process includes a layer of application design. We work very closely with our clients to comprehend their particular requirements, whether it is for high-temperature bearings or conductive polymers. We then tailor the surface coating of our crucible to ensure optimal launch of the melt. This bespoke strategy allows us to supply a remedy that is perfectly customized to the work at hand, making sure optimum efficiency regardless of the outside variables. It is this level of service that sets us besides the common crucibles found in the market.

Global Effect: The Quiet Enabler

The influence of our Alumina Ceramic Crucible expands much past the research laboratory. It is embedded in the heating systems of the world’s most advanced manufacturing centers and the activators of innovative study institutions. We are the quiet enablers of development, enabling markets to press the limits of what is feasible. From the semiconductor market to the aerospace sector, our item is the unseen hand that maintains the world moving on. We are honored to be a component of the framework that powers the worldwide economic situation, making certain that the materials that construct our globe are refined with miraculous pureness and efficiency.

Equipping Heavy Sector. In the ruthless setting of heavy machinery and commercial smelting, our Alumina Ceramic Crucible is the distinction in between a successful put and a devastating failing. It is utilized in the melting of precious metals, the handling of unusual earths, and the manufacturing of high-purity glass. By standing up to thermal shock and chemical attack, we expand the life expectancy of vital processing devices, saving industries millions of bucks in upkeep and downtime. We are pleased to be a component of the heavy market field, helping to develop the facilities that powers the contemporary world. Our crucibles are the workhorses of sector, guaranteeing that the steels we depend on are created effectively and safely.

Revolutionizing Electronic devices. Past metallurgy, our Alumina Porcelain Crucible is making waves in the electronic devices market. As the need for high-purity semiconductors expands, so does the requirement for crucibles that can hold up against the aggressive fluxes made use of in crystal growth. Our high-purity crucibles are the foundation for these sophisticated applications, allowing scientists and engineers to expand crystals that are free from flaws. We are at the center of the electronic devices revolution, verifying that our product is not simply a container, however an important element in the creation of the chips that power our electronic lives.

Driving Sustainability. Our payment to the earth is measured in energy saved and waste lowered. By offering a crucible that lasts longer and requires less frequent substitute, we assist to lower the environmental footprint of industrial processing. We are happy to be a part of the green innovation movement, aiding sectors to come to be more sustainable and effective. Our team believe that by making handling vessels that are stronger and more resilient, we can assist to develop a cleaner, greener future for all. We are committed to decreasing our own carbon footprint through energy-efficient manufacturing procedures and the advancement of recyclable refractory materials.

Future Vision: The Age of Smart Refractories

( Alumina Ceramic Crucible)

As we look to the perspective, our vision for the Alumina Ceramic Crucible is one of intelligence and assimilation. We see a future where these ceramic vessels are not just easy containers, yet energetic individuals in the melting process. We are pioneering the advancement of crucibles with ingrained sensors that can keep track of the temperature and chemistry of the thaw in real-time. We are investing greatly in research study to develop nano-composites that incorporate the thermal security of alumina with the durability of zirconia. This will certainly produce products that are not simply heat immune, however practically unbreakable. Moreover, we are discovering the use of additive production to develop complicated inner geometries that enhance heat transfer and liquid dynamics within the crucible. By using 3D printing innovation, we intend to considerably decrease the lead time for personalized crucible designs, allowing our clients to innovate quicker. We are constructing the bridge between traditional ceramics and sophisticated materials scientific research, ensuring that our crucibles continue to be the vessel of choice for the markets of tomorrow.

TRUNNANO chief executive officer Roger Luo claimed:”We exist to understand the warmth of production. Our Alumina Porcelain Crucible transforms molten chaos into pure potential, encouraging mankind to build a brighter and more advanced world.”

Provider

Alumina Technology Co., Ltd focus on the research and development, production and sales of aluminum oxide powder, aluminum oxide products, aluminum oxide crucible, etc., serving the electronics, ceramics, chemical and other industries. Since its establishment in 2005, the company has been committed to providing customers with the best products and services. If you are looking for high quality a alumina, please feel free to contact us.
Tags: Alumina Ceramic Crucible, Alumina Ceramic, Ceramic Crucible

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1. The Scientific Research Behind Silicon Carbide Crucible’s Strength

(Silicon Carbide Crucibles)

To understand why the Silicon Carbide Crucible dominates extreme settings, photo a microscopic fortress. Its structure is a lattice of silicon and carbon atoms bonded by solid covalent links, creating a material harder than steel and almost as heat-resistant as ruby. This atomic arrangement offers it three superpowers: an overpriced melting factor (around 2,730 levels Celsius), reduced thermal growth (so it does not crack when warmed), and exceptional thermal conductivity (spreading warm uniformly to stop hot spots).
Unlike metal crucibles, which wear away in liquified alloys, Silicon Carbide Crucibles repel chemical assaults. Molten aluminum, titanium, or uncommon planet metals can not penetrate its dense surface, thanks to a passivating layer that forms when subjected to heat. Even more outstanding is its stability in vacuum cleaner or inert environments– essential for expanding pure semiconductor crystals, where even trace oxygen can ruin the end product. In short, the Silicon Carbide Crucible is a master of extremes, balancing strength, warm resistance, and chemical indifference like no other product.

2. Crafting Silicon Carbide Crucible: From Powder to Accuracy Vessel

Developing a Silicon Carbide Crucible is a ballet of chemistry and engineering. It starts with ultra-pure resources: silicon carbide powder (commonly synthesized from silica sand and carbon) and sintering aids like boron or carbon black. These are combined into a slurry, formed right into crucible mold and mildews by means of isostatic pressing (applying consistent stress from all sides) or slip casting (putting fluid slurry into porous molds), then dried out to eliminate dampness.
The real magic happens in the heater. Utilizing hot pressing or pressureless sintering, the designed green body is heated to 2,000– 2,200 levels Celsius. Below, silicon and carbon atoms fuse, getting rid of pores and compressing the structure. Advanced methods like response bonding take it even more: silicon powder is packed into a carbon mold, after that heated up– fluid silicon reacts with carbon to form Silicon Carbide Crucible wall surfaces, causing near-net-shape components with minimal machining.
Completing touches matter. Sides are rounded to prevent stress and anxiety cracks, surfaces are brightened to decrease rubbing for simple handling, and some are coated with nitrides or oxides to boost deterioration resistance. Each step is kept an eye on with X-rays and ultrasonic examinations to guarantee no concealed imperfections– since in high-stakes applications, a little split can indicate catastrophe.

3. Where Silicon Carbide Crucible Drives Development

The Silicon Carbide Crucible’s ability to handle heat and pureness has made it vital across sophisticated markets. In semiconductor manufacturing, it’s the go-to vessel for expanding single-crystal silicon ingots. As molten silicon cools down in the crucible, it forms remarkable crystals that come to be the structure of integrated circuits– without the crucible’s contamination-free atmosphere, transistors would fall short. Similarly, it’s used to grow gallium nitride or silicon carbide crystals for LEDs and power electronic devices, where also minor impurities weaken efficiency.
Metal processing relies on it too. Aerospace foundries utilize Silicon Carbide Crucibles to thaw superalloys for jet engine turbine blades, which must hold up against 1,700-degree Celsius exhaust gases. The crucible’s resistance to erosion guarantees the alloy’s structure stays pure, creating blades that last longer. In renewable resource, it holds molten salts for focused solar energy plants, withstanding day-to-day home heating and cooling cycles without fracturing.
Also art and study benefit. Glassmakers use it to thaw specialized glasses, jewelers depend on it for casting precious metals, and laboratories use it in high-temperature experiments examining material habits. Each application depends upon the crucible’s distinct blend of sturdiness and precision– verifying that occasionally, the container is as vital as the contents.

4. Advancements Elevating Silicon Carbide Crucible Performance

As needs expand, so do advancements in Silicon Carbide Crucible style. One breakthrough is slope structures: crucibles with varying densities, thicker at the base to deal with liquified metal weight and thinner on top to lower heat loss. This optimizes both stamina and energy performance. An additional is nano-engineered finishes– slim layers of boron nitride or hafnium carbide related to the inside, enhancing resistance to aggressive thaws like molten uranium or titanium aluminides.
Additive production is also making waves. 3D-printed Silicon Carbide Crucibles permit complex geometries, like inner networks for air conditioning, which were difficult with typical molding. This minimizes thermal anxiety and extends life expectancy. For sustainability, recycled Silicon Carbide Crucible scraps are currently being reground and reused, reducing waste in production.
Smart tracking is emerging as well. Installed sensing units track temperature level and structural honesty in actual time, informing individuals to prospective failures prior to they occur. In semiconductor fabs, this implies less downtime and higher yields. These advancements make certain the Silicon Carbide Crucible remains ahead of progressing demands, from quantum computer products to hypersonic vehicle components.

5. Picking the Right Silicon Carbide Crucible for Your Process

Selecting a Silicon Carbide Crucible isn’t one-size-fits-all– it depends on your certain challenge. Purity is extremely important: for semiconductor crystal development, select crucibles with 99.5% silicon carbide content and minimal totally free silicon, which can infect thaws. For metal melting, prioritize density (over 3.1 grams per cubic centimeter) to withstand erosion.
Shapes and size matter too. Conical crucibles ease pouring, while superficial designs advertise even heating up. If working with destructive thaws, choose layered variations with improved chemical resistance. Distributor competence is essential– try to find makers with experience in your sector, as they can customize crucibles to your temperature variety, melt kind, and cycle frequency.
Expense vs. life-span is another consideration. While premium crucibles cost a lot more in advance, their ability to stand up to thousands of melts minimizes substitute regularity, conserving money long-term. Always demand samples and evaluate them in your process– real-world efficiency beats specs theoretically. By matching the crucible to the job, you unlock its full capacity as a dependable partner in high-temperature work.

Final thought

The Silicon Carbide Crucible is greater than a container– it’s a portal to grasping severe warm. Its trip from powder to accuracy vessel mirrors mankind’s mission to press borders, whether growing the crystals that power our phones or thawing the alloys that fly us to space. As technology advances, its duty will just grow, enabling developments we can not yet envision. For markets where pureness, toughness, and precision are non-negotiable, the Silicon Carbide Crucible isn’t just a device; it’s the foundation of progress.

Supplier

Advanced Ceramics founded on October 17, 2012, is a high-tech enterprise committed to the research and development, production, processing, sales and technical services of ceramic relative materials and products. Our products includes but not limited to Boron Carbide Ceramic Products, Boron Nitride Ceramic Products, Silicon Carbide Ceramic Products, Silicon Nitride Ceramic Products, Zirconium Dioxide Ceramic Products, etc. If you are interested, please feel free to contact us.
Tags: Silicon Carbide Crucibles, Silicon Carbide Ceramic, Silicon Carbide Ceramic Crucibles

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1.1 Make-up, Crystallography, and Phase Security

(Alumina Crucible)

Alumina crucibles are precision-engineered ceramic vessels made largely from light weight aluminum oxide (Al ₂ O THREE), one of the most extensively used sophisticated ceramics due to its extraordinary mix of thermal, mechanical, and chemical stability.

The dominant crystalline stage in these crucibles is alpha-alumina (α-Al ₂ O THREE), which comes from the corundum structure– a hexagonal close-packed setup of oxygen ions with two-thirds of the octahedral interstices inhabited by trivalent light weight aluminum ions.

This thick atomic packaging results in strong ionic and covalent bonding, conferring high melting point (2072 ° C), superb firmness (9 on the Mohs scale), and resistance to slip and deformation at elevated temperature levels.

While pure alumina is perfect for many applications, trace dopants such as magnesium oxide (MgO) are commonly included throughout sintering to hinder grain development and enhance microstructural uniformity, thereby boosting mechanical stamina and thermal shock resistance.

The phase pureness of α-Al ₂ O three is important; transitional alumina phases (e.g., γ, δ, θ) that develop at reduced temperatures are metastable and go through volume modifications upon conversion to alpha phase, potentially causing breaking or failure under thermal biking.

1.2 Microstructure and Porosity Control in Crucible Construction

The efficiency of an alumina crucible is greatly affected by its microstructure, which is established throughout powder handling, developing, and sintering phases.

High-purity alumina powders (normally 99.5% to 99.99% Al Two O FOUR) are shaped into crucible kinds making use of strategies such as uniaxial pressing, isostatic pushing, or slide spreading, adhered to by sintering at temperatures in between 1500 ° C and 1700 ° C.

Throughout sintering, diffusion systems drive bit coalescence, minimizing porosity and raising density– preferably attaining > 99% theoretical density to reduce leaks in the structure and chemical infiltration.

Fine-grained microstructures enhance mechanical strength and resistance to thermal anxiety, while controlled porosity (in some customized grades) can improve thermal shock resistance by dissipating strain power.

Surface area coating is additionally crucial: a smooth indoor surface lessens nucleation websites for unwanted responses and helps with simple removal of solidified materials after handling.

Crucible geometry– including wall thickness, curvature, and base layout– is maximized to stabilize heat transfer effectiveness, structural integrity, and resistance to thermal gradients during rapid home heating or cooling.

( Alumina Crucible)

2. Thermal and Chemical Resistance in Extreme Environments

2.1 High-Temperature Performance and Thermal Shock Habits

Alumina crucibles are consistently utilized in atmospheres going beyond 1600 ° C, making them indispensable in high-temperature materials research study, metal refining, and crystal development processes.

They display low thermal conductivity (~ 30 W/m · K), which, while limiting heat transfer prices, also offers a degree of thermal insulation and helps keep temperature gradients required for directional solidification or zone melting.

A key obstacle is thermal shock resistance– the capacity to hold up against sudden temperature changes without splitting.

Although alumina has a relatively reduced coefficient of thermal development (~ 8 × 10 ⁻⁶/ K), its high rigidity and brittleness make it susceptible to crack when subjected to steep thermal slopes, especially throughout rapid home heating or quenching.

To reduce this, users are recommended to follow controlled ramping methods, preheat crucibles progressively, and avoid direct exposure to open up fires or cool surface areas.

Advanced qualities incorporate zirconia (ZrO TWO) strengthening or rated compositions to enhance fracture resistance through systems such as phase change toughening or residual compressive stress generation.

2.2 Chemical Inertness and Compatibility with Reactive Melts

One of the specifying benefits of alumina crucibles is their chemical inertness towards a vast array of liquified metals, oxides, and salts.

They are very resistant to fundamental slags, molten glasses, and numerous metal alloys, including iron, nickel, cobalt, and their oxides, which makes them appropriate for use in metallurgical evaluation, thermogravimetric experiments, and ceramic sintering.

Nevertheless, they are not universally inert: alumina responds with highly acidic fluxes such as phosphoric acid or boron trioxide at heats, and it can be corroded by molten antacid like sodium hydroxide or potassium carbonate.

Specifically critical is their communication with light weight aluminum steel and aluminum-rich alloys, which can reduce Al two O five using the response: 2Al + Al ₂ O TWO → 3Al ₂ O (suboxide), causing matching and ultimate failing.

In a similar way, titanium, zirconium, and rare-earth steels display high reactivity with alumina, forming aluminides or complex oxides that compromise crucible integrity and contaminate the melt.

For such applications, alternate crucible materials like yttria-stabilized zirconia (YSZ), boron nitride (BN), or molybdenum are favored.

3. Applications in Scientific Research and Industrial Processing

3.1 Role in Products Synthesis and Crystal Development

Alumina crucibles are central to various high-temperature synthesis paths, consisting of solid-state responses, change development, and melt handling of useful porcelains and intermetallics.

In solid-state chemistry, they work as inert containers for calcining powders, synthesizing phosphors, or preparing precursor materials for lithium-ion battery cathodes.

For crystal development techniques such as the Czochralski or Bridgman approaches, alumina crucibles are made use of to have molten oxides like yttrium aluminum garnet (YAG) or neodymium-doped glasses for laser applications.

Their high pureness ensures minimal contamination of the expanding crystal, while their dimensional security sustains reproducible growth conditions over prolonged periods.

In change development, where single crystals are expanded from a high-temperature solvent, alumina crucibles must stand up to dissolution by the flux medium– typically borates or molybdates– needing careful selection of crucible quality and handling specifications.

3.2 Use in Analytical Chemistry and Industrial Melting Workflow

In logical research laboratories, alumina crucibles are typical equipment in thermogravimetric evaluation (TGA) and differential scanning calorimetry (DSC), where accurate mass measurements are made under controlled environments and temperature ramps.

Their non-magnetic nature, high thermal stability, and compatibility with inert and oxidizing atmospheres make them suitable for such accuracy measurements.

In commercial setups, alumina crucibles are utilized in induction and resistance heaters for melting rare-earth elements, alloying, and casting procedures, specifically in precious jewelry, dental, and aerospace element manufacturing.

They are additionally made use of in the manufacturing of technical porcelains, where raw powders are sintered or hot-pressed within alumina setters and crucibles to avoid contamination and make sure consistent heating.

4. Limitations, Managing Practices, and Future Material Enhancements

4.1 Functional Constraints and Ideal Practices for Longevity

Regardless of their effectiveness, alumina crucibles have well-defined functional restrictions that should be respected to make certain security and performance.

Thermal shock continues to be one of the most common cause of failing; for that reason, steady home heating and cooling cycles are essential, especially when transitioning through the 400– 600 ° C array where residual tensions can gather.

Mechanical damages from messing up, thermal biking, or contact with tough products can launch microcracks that propagate under tension.

Cleansing need to be performed very carefully– staying clear of thermal quenching or rough methods– and used crucibles should be checked for signs of spalling, discoloration, or contortion prior to reuse.

Cross-contamination is an additional concern: crucibles made use of for responsive or toxic products should not be repurposed for high-purity synthesis without extensive cleaning or should be disposed of.

4.2 Arising Trends in Compound and Coated Alumina Solutions

To extend the capabilities of typical alumina crucibles, scientists are developing composite and functionally rated products.

Examples consist of alumina-zirconia (Al two O TWO-ZrO TWO) compounds that improve durability and thermal shock resistance, or alumina-silicon carbide (Al two O THREE-SiC) variants that improve thermal conductivity for even more consistent heating.

Surface layers with rare-earth oxides (e.g., yttria or scandia) are being explored to create a diffusion obstacle versus responsive steels, consequently expanding the range of suitable thaws.

Furthermore, additive production of alumina elements is emerging, enabling custom-made crucible geometries with inner networks for temperature tracking or gas flow, opening up brand-new opportunities in procedure control and reactor layout.

In conclusion, alumina crucibles continue to be a cornerstone of high-temperature technology, valued for their reliability, purity, and versatility throughout clinical and commercial domains.

Their proceeded evolution via microstructural engineering and crossbreed product design makes sure that they will continue to be essential devices in the improvement of products scientific research, power technologies, and progressed manufacturing.

5. Distributor

Alumina Technology Co., Ltd focus on the research and development, production and sales of aluminum oxide powder, aluminum oxide products, aluminum oxide crucible, etc., serving the electronics, ceramics, chemical and other industries. Since its establishment in 2005, the company has been committed to providing customers with the best products and services. If you are looking for high quality alumina crucible with lid, please feel free to contact us.
Tags: Alumina Crucible, crucible alumina, aluminum oxide crucible

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