金刚石抛光用钨合金的热压烧结

Hot pressing sintering process of tungsten alloy for polishing diamond

为了获得适用于摩擦化学抛光单晶金刚石用的高性能W-Mo-Cr合金抛光材料,采用机械合金化法制备的微细W-Mo-Cr合金粉末为原料,研究热压烧结参数(烧结温度、压力和保温时间)对材料致密度和硬度的影响,并采用扫描电镜(SEM)对材料的显微组织进行观察。结果表明:采用机械合金化和热压固相烧结相结合的方法可以制备出高致密度、高硬度的合金材料,合金材料组织致密,平行精度良好;在烧结温度为1400℃、压力为30 MPa、保温时间为30 min的工艺条件下,所制备的W-Mo-Cr合金材料相对密度为96.49%,硬度为777.78HV。

In order to obtain high-performance W-Mo-Cr alloy material which is suitable for polishing diamond by dynamic friction polishing, the micro W-Mo-Cr composite powder prepared by mechanical alloying was used as original material. Through controlling the hot pressing sintering process, the effects of sintering temperature, pressure, holding time on the density, hardness and micro structure of the alloy materials were investigated. The results show that W-Mo-Cr alloy materials with high density and high hardness can be prepared by the method of mechanical alloying combining with hot pressing solid phase sintering, and the component of the materials can keep dense, the parallel precision of the materials is excellent. The materials with high density were fabricated under the processing conditions of sintering temperature of 1400 ℃, pressure of 30 MPa and holding time of 30 min. The relative density of materials is 96.49%, and the hardness is 777.78 HV.