1. Preparation of High-Purity Aluminum Oxide Powder

  The preparation of high-purity aluminum oxide ceramics demands a high standard for the raw powder. Typically, the primary raw material consists of aluminum oxide powder with a crystalline phase of α-phase and purity exceeding 99.99%. The characteristics of ultra-fine, high-purity aluminum oxide powder play a crucial role in determining the final properties of high-purity aluminum oxide ceramics. During the preparation of the high-purity aluminum oxide powder, several factors come into play: the purity of the powder, small and uniform particle size, high powder reactivity, and minimal agglomeration. These attributes allow the production of high-purity aluminum oxide ceramics at relatively lower temperatures. Therefore, the initial step in creating high-purity aluminum oxide ceramics involves the production of high-purity aluminum oxide powder. Presently, methods for producing high-purity ultra-fine aluminum oxide powder include improved Bayer process, aluminum hydroxide thermal decomposition method, precipitation method, and high-purity aluminum hydroxide hydrolysis method.

2. Methods for Preparing High-Purity Aluminum Oxide Ceramics

  Following the acquisition of high-purity aluminum oxide powder, the next step involves shaping it into well-formed green bodies. The selection of a suitable sintering method for producing high-purity aluminum oxide ceramics is influenced by product requirements and cost considerations. Some commonly employed sintering methods include atmospheric pressure sintering, hot pressing sintering, two-step sintering, spark plasma sintering, and microwave sintering.

In Conclusion

  In conclusion, the methods for preparing high-purity aluminum oxide ceramics have been outlined. These ceramics exhibit high melting points, exceptional hardness, and remarkable mechanical strength, making them highly versatile for applications in precision bearings, instruments, measurement devices, pen manufacturing, mechanical components, extrusion dies, oil fields, hydrochloric acid laboratories, hardness testers, fishing equipment, counterweights, decoration, and precision machining industries.

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