压制压强对WC-8%Ni硬质合金性能的影响

2019-08-30

作者：李亚军1，3，栾道成1，袁宏辉2，孙文文1，王正云1，邓天鑫1，李缘1，任阳1，左城铭1 单位：1西华大学；2成都工具研究所有限公司；3中国石油集团济柴动力有限公司成都压缩机分公司

摘要：采用不同的压制压强160MPa、240MPa、320MPa、400MPa压制WC8%Ni硬质合金B型试样，在真空烧结炉中进行1480℃×60min烧结。通过排水法实验、硬度实验、弯曲试验、金相显微镜等分析方法，研究了压制压强对WC8%Ni硬质合金的相对密度、孔隙度、线收缩系数、硬度和抗弯强度的影响。结果表明，随着压制压强的增加，相对密度逐渐增加，线收缩系数逐步减小，硬度和抗弯强度先增加而后减少。在压制压强320MPa时，WC8%Ni硬质合金的性能达到最佳值。

关键词：压制压强；WC8%Ni硬质合金；相对密度；硬度；抗弯强度

中图分类号：TG306；TH161文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.09.009

Effects of Compacting Pressure on Properties of WC8% Ni Cemented Carbides

Li Yajun，Luan Daocheng，Yuan Honghui，Sun Wenwen，Wang Zhengyun，

Deng Tianxin，Li Yuan，Ren Yang，Zuo Chengming

Abstract:Btype specimens of WC8%Ni cemented carbides are pressed under different pressures of 160MPa，240MPa，320MPa and 400MPa，and sintered in a vacuum sintering furnace at 1480℃ for 60 minutes.The effects of compacting pressure on relative density，porosity，linear shrinkage coefficient，hardness and traverse strength of WC8%Ni cemented carbides are researched drainage test，hardness test，bending test and metallographic microscope.The results show that with the increase of compacting pressure，the relative density increases gradually，the linear shrinkage coefficient decreases gradually，and the hardness and traverse strength first increase and then decrease.The best performance of WC-8% Ni cemented carbide when the compacting pressure is 320MPa.

Keywords:compacting pressure；WC8%Ni cemented carbides；relative density；hardness；traverse strength