High-purity Alumina Ceramic Crucibles High-temperature Resistant Alumina Ceramic Crucibles for Melting
Product Description
Alumina ceramic crucible is a container made of high-purity aluminum oxide (Al₂O₃) ceramic material, typically in the shape of a cup or bowl, used for melting, sintering, burning, or chemically processing samples at high temperatures.
It is made by dry-pressing, isostatically pressing, or slip-casting fine aluminum oxide powder (95%-99.9% Al₂O₃), followed by sintering at temperatures between 1600°C and 1800°C. Its performance and value depend entirely on the purity of the aluminum oxide and the manufacturing process.
Core Performance and Advantages
The advantages of alumina ceramic crucibles are the fundamental reason they can operate under extreme conditions:
1. Extremely High Temperature Resistance:
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Long-term operating temperatures can reach 1500-1700°C, with short-term maximum operating temperatures reaching 1800°C. Its melting point is as high as 2050°C, far exceeding that of most metals.
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Advantages: Capable of handling processes requiring extremely high temperatures, whereas graphite crucibles oxidize in air and metal crucibles melt.
2. Excellent Thermal Stability and Thermal Shock Resistance:
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The low coefficient of thermal expansion allows it to withstand drastic temperature fluctuations (rapid heating and cooling) without cracking.
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Advantage: Safer and more reliable for use in high-temperature furnaces, reducing the risk of damage from thermal shock.
3. Excellent Chemical Inertness:
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It is highly resistant to most chemicals and is resistant to attack by strong acids, strong bases, various molten salts, and slag.
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Advantage: It does not contaminate samples, ensuring experimental accuracy. It can be used to handle highly corrosive fluxes (such as sodium carbonate and sodium peroxide) and molten metals.
4. High Hardness and Good Wear Resistance:
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High hardness and excellent mechanical strength make it resistant to scratching and wear, and it has a long service life.
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Advantage: More scratch-resistant than platinum crucibles and not susceptible to "poisoning" (forming alloys with certain metals).
5. High Purity and Low Contamination:
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High-purity alumina crucibles (e.g., 99.7% Al₂O₃) inherently contain very low impurities.
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Advantages: Ideal for high-end material synthesis (e.g., phosphors, lithium battery cathode materials, electronic ceramics) and precision analysis (e.g., XRF/XRD sample pretreatment), avoiding the introduction of impurities that could interfere with results.
Main Application Areas
Alumina ceramic crucibles are widely used in scientific research and industry, primarily for laboratory analysis and high-end material synthesis. The higher the purity, the better the temperature resistance, corrosion resistance, and purity, but also the higher the price.
1. Material Synthesis and R&D:
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Lithium Battery Materials: Sintered cathode materials (such as lithium iron phosphate and lithium cobalt oxide), solid-state electrolytes.
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Phosphors: Synthesize phosphors for LEDs using a high-temperature solid-phase method.
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Electronic Ceramics: Prepare ceramic powders, sintered varistors, ceramic capacitors, and other components.
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Ceramic Coatings: Used for the melt processing of thermal spray powders.
2. Chemical and Analytical Experiments:
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Sample Preparation: Prepare samples using the melt process for X-ray Fluorescence (XRF) and X-ray Diffraction (XRD) analysis, melting the sample with a flux such as lithium borate.
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Ignition Precipitation: Ignite the precipitate at high temperatures in a muffle furnace to calculate its weight.
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Ashing: Ashing organic matter at high temperatures for the determination of inorganic components.
3. Metal Processing:
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Used for melting low-reactivity metals and alloys such as aluminum, copper, zinc, silver, and their alloys. Note: Do not use for melting highly reactive metals such as titanium, zirconium, and tantalum, as these will reduce aluminum oxide.
4. Glass Industry:
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Used for melting and purifying small batches of specialty glass or glass glazes.
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