纳米硬质合金粉的桥接团粒对粉末成形影响  

Effects of Bridged Particles on the Compressibility of Nanometer Cemented Carbide Powder

作　　者：张丽英 郭志猛[1] 林涛[1] 李汶霞[1] 吴成义[1] 吴庆华 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京中拓科技所,北京100096

出　　处：《北京科技大学学报》2002年第2期103-106,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助课题(No.50004001)

摘　　要：采用汞压仪和ＡＭＴ—２４００孔径分析仪，研究纳米硬质合金粉末“桥接”团粒对粉末及 其压坯中孔隙体积分布曲线的影响．用沉降分离、高能剪切粉碎。（ＢＥＴ）比表面分析和扫描电镜 观察等手段研究了桥接团粒在分离和破碎过程中，相对松装密度和比表面积的变化及高能破 碎对粉末成形致密化的影响．结果表明“桥接”团粒会造成不同的孔隙体积分布高峰，高能破碎 使粉末的相对松装密度成倍增加，并可使压坯的密度大幅度增加．By means of the mercurial barometer and pore size analyzer, the effects of bridged particles on the pore volume distribution in nano-meter cemented carbide powder and its compact were investigated. Also the apparent density, specific surface area and green density were studied before and after sedimentation sep- arating and high energy shear milling by BET specific surface area analyzer and SEM. The results show that there is more than one peak on pore volume distribution pattern because of the presence of bridged particles. The apparent density and green density can be greatly improved by high-energy milling.

关 键 词：纳米硬质合金粉 桥接团粒 粉未成形 高能剪切粉碎 压坯 纳米粉末 

分 类 号：TF125.3[冶金工程—粉末冶金] TF124.5[冶金工程—冶金物理化学]