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针对原位自生Al2O3增强钼基复合材料晶粒较大的问题,采用溶胶-凝胶与高能球磨相结合的方法细化复合材料晶粒,并利用SEM、XRD对不同球磨工艺所制备Al2O3/Mo复合粉末及复合材料的组织进行了观察和分析。结果表明:随着球磨时间的延长,Al2O3/Mo复合粉末颗粒由球状变为层片状再成为细小的球状,颗粒大小由约1.5μm细化为约500nm,其中的钼晶粒不断细化;高球料比所得粉末的分散性和破碎细化程度较好;转速提高使得粉末颗粒的尺寸均匀程度降低,且伴有结块现象,不利于粉末的细化。在球料比5∶1、转速300r/min、球磨时间60h条件下获得的复合粉末,经压坯烧结可制备出Al2O3颗粒为纳米级的钼基复合材料。
Aiming at the large grain size of in-situ self-reinforced Al2O3-reinforced molybdenum matrix composites, composite grains were refined by a combination of sol-gel and high-energy ball milling. SEM and XRD were used to study the effect of Al2O3 / Mo Composite powder and composite materials were observed and analyzed. The results show that the particle size of Al2O3 / Mo composite powder changes from spherical to lamellar to spherical, and the grain size changes from about 1.5μm to about 500nm. The molybdenum crystal grains are continuously refined. High sphericity of the material than the resulting powder dispersion and fine degree of fragmentation better; speed increases the size of the powder particles to reduce the degree of uniformity, and with caking phenomenon, is not conducive to the refinement of the powder. In the ball material ratio of 5: 1, speed 300r / min, ball milling time of 60h obtained under the conditions of the composite powder, the sintering of the compact can be prepared Al2O3 particles nanoscale molybdenum matrix composites.