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通过沉降实验并借助SEM观察探讨了不同分散剂、不同分散介质对纳米ZrO2 颗粒分散效果的影响。介绍了SiC晶须分散工艺,探讨了多相悬浮液混合法制备ZrO2 (n) MoSi2 复合粉体及SiC(W) ZrO2 (n) MoSi2 复合粉体的均匀混合工艺。结果表明:以PEG为分散剂、水为分散介质可以有效地分散纳米ZrO2 并能与基体MoSi2 粉末均匀混合;通过调节乙醇悬浮液的pH值,可将SiC晶须均匀分散在ZrO2 (n) MoSi2 复合粉体中,获得分布均匀的SiC(W) ZrO2 (n) MoSi2 复合粉。
The effects of different dispersants and different dispersion mediums on the dispersion of nano-ZrO2 particles were discussed by sedimentation experiments and SEM observations. The SiC whisker dispersion process is introduced. The uniform mixing process of ZrO2 (n) MoSi2 composite powders and SiC (W) ZrO2 (n) MoSi2 composite powders by multiphase suspension mixing is discussed. The results showed that nano-ZrO2 can be effectively dispersed with PEG as dispersant and water as dispersion medium and can be uniformly mixed with matrix MoSi2 powder. The SiC whiskers can be uniformly dispersed in ZrO2 (n) MoSi2 by adjusting the pH of ethanol suspension. In the composite powder, SiC (W) ZrO2 (n) MoSi2 powder with uniform distribution was obtained.