一种烧结铁基合金Fe-Cr-Mo-Ni-Co-C的热致密化过程

来源期刊：中南大学学报(自然科学版)2006年第3期

论文作者：朱远志 尹志民 李学谦

文章页码：455 - 460

关键词：粉末冶金;铁基材料;致密化;烧结;临界生坯密度

Key words：powder metallurgy; Fe-based material; densification; sintering; threshold compact density

摘    要：利用金相、扫描电镜和密度测试等方法研究Fe-Cr-Mo-Ni-Co-C合金的致密化过程,烧结过程中烧结密度与压实密度的关系,烧结致密化过程中孔隙的变化规律与烧结体积的收缩规律。通过研究合金烧结体积的收缩规律,提出临界压坯密度的概念,并从理论上推导出临界压坯密度计算方程。研究结果表明:合金中的孔隙主要有2种类型,即粒径为30μm左右的大孔隙和粒径在10μm以下的小孔隙,这2种孔隙分别由生坯中的2种主要间隙在烧结过程中演变而成。

Abstract: Optical microscopy, scanning electronic microscopy and density measurement were used to study hot densification behavior of Fe-Cr-Mo-Ni-Co-C alloy, relationship between density of sintering density and sintered density, and the law of shrinkage of bulk. Evolution of porosity and microstructure were discussed. Based on the research of bulk shrinkage, an equation used for calculation of threshold green compact density was suggested. The results show that there are two types of pore in the sintered alloy, i.e., one is coarsen pores with diameter more than 30μm, the other is thin pores with diameters less than 10μm. These two types of pore evolve from two voids in green compacts respectively.