Surface-modified nano-zirconia ceramic powder and preparation method thereof

Abstract

The invention relates to a preparation system of surface-modified nano-zirconia ceramic powder. The preparation system at least includes a first refinement device and a modification device. The first refinement device is provided with a first air flow channel, and the first air flow channel It is configured to allow the first external airflow to sieve out the first part of the raw material and the second part of the raw material that are different in degree of refinement from the reaction raw material in a manner of trapping the reaction raw material that has undergone at least one refinement in the first refinement device. The first ambient air flow in turn diffuses the first portion of the raw material from the first chamber of the first refiner to the second chamber of the first refiner and enables the first portion of the raw material to be The aerodynamic force it exerts carries out at least one sieving and / or refluxing in such a way that it avoids its impingement contact with the first inner wall of the first refiner during the diffusion process causing the first portion of raw material to adhere 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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