摘要
选用不同粗细粒度的原材料,采用进口Dorst压机,研究了压力大小对压坯密度以及线收缩系数的影响,建立了压制曲线,并运用光学显微镜分析了压坯烧结后的金相孔隙。结果表明,压力小于100MPa时,压坯密度随压力增加而快速增加,继续加大压力,密度增加趋势减缓。若采用过小的压力压制压坯,正常烧结后产品不能完全致密化,而当压力过大时,压坯出现裂纹。
This paper chose different granularity of raw materials, used import dorst press, the pressure on the com- pact density and the influence on the linear shrink factor were analyzed and the pressing curve was established. Optical mi- croscope was used to calculate sample metallographic pore after sintering. The results show that when the pressure is less than IOOMPa, compact density increases quickly with pressure increase, continue to increase the pressure, the rapid in- creasing slowly. Too small pressure pressed compact, after normal sintering, product can＇ t completely densification, too much pressure, product cracks.
出处
《工具技术》
北大核心
2015年第6期47-50,共4页
Tool Engineering
基金
国家科技重大专项(2013ZX04009-031)
关键词
硬质合金
压制压力
收缩系数
cemented carbide
pressure
linear shrink factor
