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采用溶胶—凝胶技术制备Al2O3/Mo复合粉末,研究了过程控制剂(PCA)———硬脂酸和无水乙醇对Al2O3/Mo复合粉末细化的影响。利用X射线衍射仪和扫描电镜对复合粉末进行物相和形貌分析,利用激光粒度分布测试仪测试了粉末的粒度分布。结果表明:添加过程控制剂可以有效降低粉末粘球和结块的现象,提高出粉率;不添加过程控制剂时,粉末颗粒大小极不均匀;以硬脂酸和无水乙醇作PCA时,随着球磨时间的延长,Al2O3/Mo复合粉末逐渐被细化,颗粒大小相对均匀,颗粒形态经历了从球状向片状再到球形的转化,其中以无水乙醇作PCA时,粉末被细化的速率较高。以硬脂酸作PCA最终制得的粉末较以无水乙醇作PCA最终得到的粉末,粒度分布较为均匀,且细小颗粒的粒径分布较多。
Al2O3 / Mo composite powders were prepared by sol-gel technique. The effects of process control agent (PCA) --- stearic acid and anhydrous ethanol on the refining of Al2O3 / Mo composite powders were studied. The phase and morphology of the composite powder were characterized by X-ray diffraction and scanning electron microscopy. The particle size distribution of the powder was tested by laser particle size distribution tester. The results show that adding the process control agent can effectively reduce the sticking and caking of the powder and increase the output rate of the powder. When the process control agent is not added, the particle size of the powder is extremely uneven. When stearic acid and anhydrous ethanol are used as the PCA, With the milling time prolonging, the Al2O3 / Mo composite powder is gradually refined, the particle size is relatively uniform, and the particle morphology undergoes transformation from spherical to flaky to spherical shape. When anhydrous ethanol is used as PCA, the powder is refined The rate is higher. The final powder with stearic acid as PCA was more stable than anhydrous ethanol with PCA. The particle size distribution was more uniform and the distribution of fine particles was more.