球磨方式对TiC/316L复合粉末压缩性及烧结行为的影响  

Effect of milling technique on compactability and sintering behavior of TiC/316L composite powders

作　　者：蔺绍江[1,2] 熊惟皓[2] 姚振华[2] 石其年[1] 

机构地区：[1]湖北理工学院机电工程学院,黄石435003 [2]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《粉末冶金材料科学与工程》2012年第4期430-436,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：湖北省教育厅科研计划项目(B20123002);湖北省重点学科"机械电子工程"资助项目

摘　　要：应用双对数压制方程和相关烧结模型,分析和探讨不同球磨方式对TiC/316L复合粉末的压制特性及烧结行为的影响,并采用扫描电镜观察复合粉末的形貌。结果表明,采用湿磨方式获得的复合粉末,其破碎程度不够,很多316L不锈钢颗粒特别是颗粒较小的不锈钢颗粒变形不大,仍然呈球形,不利于其后续的压制和烧结;采用直接干磨获得的复合粉末,其表面新鲜断裂面多,粉末表面活性大,有利于粉末的烧结致密化,但其加工硬化明显,压制成形性能较差;与其他球磨方式相比,采用先干磨再湿磨的球磨方式获得的复合粉末不仅具有较好的成形性能,而且粉末烧结激活能低,以该粉末为原料可以获得较高相对密度的烧结体。The effect of milling technique on eompactahility and sintering behavior of TIC/316L composite powders were investigated by using HUANG Pei-yun＇s log-log powder compacting theory and relevant sintering theory, and composite powders morphology was characterized by scanning electron microscope. The results indicate that ball milling in alcohol results in TIC/316L composite powders having sphere shape grains with a fewer broken, which has a negative effect on their subsequent compression and sintering; the dry ball milling results in more fresh fracture surface, and the composite powders show much larger surface activity, which is conducive to powder sintering densification, but the apparent hardening during ball milling process leads to a poor pressing performance. Compared with other milling methods, the TiC/316L composite powders prepared by the milling method of dry first and then wet grinding exhibit a better formability, and lower activation energy of sintering, and the powder can be used to obtain sintered body with a higher relative density.

关 键 词：球磨方式 压制特性 烧结 

分 类 号：TB331[一般工业技术—材料科学与工程]