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创新性地采用多物理场活化烧结微成形技术(Micro-FAST)制备了316L不锈钢和纯Cu微型齿轮。探讨了电流大小对316L不锈钢和纯Cu粉末体系在烧结过程中颗粒变形的影响。结果表明,在电场、力场和温度场的耦合作用下,升温过程是粉末体系实现致密化的主要过程。由于电塑性效应的影响,粉末体系在致密化过程中表现出的显著特征之一是颗粒的塑性变形。电流越大,颗粒的变形量越大,粉末体系的轴向尺寸减小量越多,最终微型烧结体的相对密度也越大。
Innovative 316L stainless steel and pure Cu micro gears were produced using multi-physics activated-sintered micro-forming technology (Micro-FAST). The effect of current on the grain deformation of 316L stainless steel and pure Cu powder during sintering was investigated. The results show that the heating process is the main process of powder densification under the coupling of electric field, force field and temperature field. Due to the influence of the electrical plasticity, one of the salient features of the powder system during densification is the plastic deformation of the particles. The larger the current, the greater the deformation of the particles, the smaller the axial size of the powder system, the greater the relative density of the final micro-sintered body.