Surface-modified nano zirconium oxide ceramic powder particles and preparation method thereof

Abstract

The invention relates to a preparation system of surface-modified nano zirconium oxide ceramic powder particles. The preparation system at least comprises a first refining device and a modifying device, wherein the first refining device is provided with a first air flow channel, the first air flow channel is configured to allow a first external air flow to screen out a first part of raw materialsand a second part of raw materials with different refining degrees in reaction raw materials in the mode of gathering reaction raw materials which are refined at least one time in the first refining device, then the first external air flow diffuses the first part of raw materials from a first cavity of the first refining device to a second cavity of the first refining device, and therefore the first part of raw materials can be screened and / or flow back through pneumatic force applied by the first external air flow on the first part of raw materials in the mode of being prevented from making impact contact with the first inner wall of the first refining device in the diffusing process and adhering to the first inner wall.

Description

technical field [0001] The invention relates to the field of powder technology, in particular to a surface-modified nano zirconia ceramic powder and a preparation method thereof. Background technique [0002] The surface modification method of powder refers to the method of changing the physical and chemical properties of the surface or interface of non-metallic mineral powder, mainly including surface physical coating, chemical coating, inorganic precipitation coating or thin film, mechanochemistry, chemical intercalation, etc. . At present, the commonly used methods of powder surface modification in industry mainly include surface chemical coating modification method, precipitation reaction modification method, mechanochemical modification method and composite method. [0003] Due to the small particle size and high surface energy of ultra-fine powder, especially nano-scale powder, it is easy to agglomerate and form secondary particles, which cannot show its favored surfa...

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Problems solved by technology

[0013] Aiming at the deficiencies of the prior art, such as the problems in the prior art that there are many residual powders in the device when crushing solid raw materials, which leads to low fine grinding efficiency and the powder cannot meet the requirements after crushing, the inventors of the present invention Practice and comparison of a large number of related experiments proves that the existing conventional solutions to enhance the fluidity of solid raw material particles by adding sufficient grinding aids under mechanical mixing, due to the grinding systems of different processes, mills of different specifications and Different types of raw materials will directly affect the adaptability of grinding aids and its effective dosage cannot be controlled. Especially in the case of excessive grinding aids, it will inevitably reduce the fluidity between powder particles and fail to achieve the expected goal. It proves that the existing improved feeding equipment or grinding equipment will not only bring a lot of cost and uncontrollable factors, but also the pure mechanical pulverization method will cause local overheating and long-term pressure and friction and wear effects

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