What material is alumina ceramic?
Release time:
2025/02/06
Alumina ceramic is a ceramic material with alumina (Al₂O₃) as the main component, featuring extremely high hardness and high thermal conductivity, making it one of the widely used oxide ceramics in industry.
Chemical Composition and Physical Properties
The main component of alumina ceramic is alumina (Al₂O₃), and its purity can vary according to application requirements, commonly found in 75% alumina ceramic, 95% alumina ceramic, 99% alumina ceramic, etc. Alumina ceramic has characteristics such as high hardness, high wear resistance, good corrosion resistance, and thermal stability. Its hardness can reach HRA80-90, second only to diamond, with excellent wear resistance.
Preparation Process
Alumina ceramic is usually made from bauxite and can be prepared through various processes such as injection molding, die pressing, isostatic pressing, slip casting, diamond machining, and extrusion. Additionally, it can be produced through dry pressing and sintering or using appropriate sintering aids for hot pressing.
Applications
Mechanical Equipment: Alumina ceramic is commonly used in mechanical equipment as bearings, seals, and cutting tools, with its high hardness and excellent mechanical properties ensuring a long service life and stable performance.
Electronic Devices: In electronic devices, alumina ceramic is often used as a high-temperature and wear-resistant insulator or thermal conductive material, meeting the demands of electronic equipment in high-temperature and high-speed environments.
Chemical Industry: Due to its resistance to acid and alkali corrosion, alumina ceramic is widely used in the preparation of containers, pipelines, and catalysts, protecting equipment from chemical corrosion.
Other Applications: Alumina ceramic is also used to make wear-resistant linings, knife sharpeners, and precision components in high wear environments.
Advantages and Disadvantages
Advantages: High hardness, high wear resistance, good corrosion resistance and thermal stability, excellent insulation, and low high-frequency loss.
Disadvantages: Mechanical strength decreases at high temperatures, and due to the significant difference in thermal expansion coefficients, thermal shock resistance is not very effective.
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