Preparation method of oxidecocrystal structureceramic powder

Abstract

The invention discloses a preparation method of oxideeutecticstructureceramic powder. The method comprises the following steps: preparing an eutecticmaterial with fine and uniform tissue through a laser floating zone melting technology, then preserving a microcosmiceutectic structure with strong interface bonding into eutectic powder through crushing and screening, and further preparing eutectic powder with certain particle size distribution, thereby effectively reserving an eutecticstructure in an initial eutectic sample into a sinteredeutectic crystalthrough reasonable collocation of lamellar spaces and eutectic powder particle size of the initial eutectic sample. Theoxideeutecticstructureceramic powder is in a typicaleutectic morphology; eutecticmaterials with different lamellar spaces are obtained by changing the withdrawal rate during a laser floating zone melting process; eutectic powder with differentparticle size distribution is obtained through the combination of the withdrawal rate and ball milling time.

Description

technical field [0001] The invention relates to the field of preparation of oxide eutectic ceramic powder. Specifically, the alumina-based eutectic ceramics with a eutectic structure are prepared by laser suspension zone melting, and then the eutectic ceramic powder with a certain particle size distribution is prepared by crushing and sieving. Background technique [0002] Aluminum oxide-based composite ceramics have a high melting point, excellent high-temperature strength and high-temperature oxidation resistance, and have become one of the preferred high-temperature structural materials in high-temperature oxidizing atmospheres. The traditional powder sintering method has begun to take shape in industrial applications, and can prepare highly dense ceramic materials, but the samples prepared by it are generally polycrystalline, and the grain boundaries and amorphous phases existing in the material are weakened at high temperatures. Phase, which in turn makes the performan...

AI Technical Summary

Problems solved by technology

[0004] literature( E,Ayas E.Fabrication and microstructural stability ofspark plasma sintered Al 2 o 3 / Er 3 al 5 o 12 eutectic[J].Ceramics International,2015,41(10):12869-12877.), melting Al by crushing arc 2 o 3 / Er 3 al 5 o 12 The eutectic sample obtained eutectic powder particles with a particle size of less than 100 μm, and then used spark plasma sintering technology to obtain a highly dense sintered eutectic composite ceramic material. The hardness of the material is 14.11-15.86GPa. However, since the initial eutectic sample prepared by arc melting exhibits different microstructures in different regions, the uniformity of the microstructure in the obtained sintered eutectic composite ceramics is poor. During the preparation of crystal powder, the powder particles with smaller particle size are not removed, so more polycrystalline structure will be introduced, which will affect the performance of the material

Images