纳米复合WC-6Co粉末的快速烧结

Fast Sintering of Nanocrystalline WC-6Co Composite Powder

摘要:

以液相复合-连续还原碳化方法制备的纳米复合WC-6Co粉末为原料，采用放电等离子烧结（SPS），制取了超细硬质合金。利用扫描电镜、维氏硬度仪、洛氏硬度仪、密度测试仪、MTS陶瓷测试系统等，观察烧结体显微结构，测试其硬度、密度、断裂强度、矫顽磁力、磁饱和度。结果表明采用放电等离子烧结获得的烧结体的硬度HVl≥19500MPa，断裂强度TRS≥2800MPa，平均晶粒度150nm～300nm。制备了高强度、高硬度的超细WC-6Co硬质合金。

Abstract:

Nanocrystalline WC-6Co composite powder that was produced by spray thermal decomposition-continuous and carbonizatio technology was used as raw material, and this paper adopted spark plasma sintering technology to prepare ultrafine cemented carbide. Th microstructure, grain size, porosity, Vickers hardeness, density and Rockwell a hardness (HRA), transverse rupture strength (TRS magnetic saturation induction and magnetic coercivity were studied. The results show that grain of specimen that was prepared by spar plasma sintering technology is 150 nm~300 nm, transverse rupture strength (TRS) is more than 2800 MPa, and Vickers hardness o specimen is more than 19 500 MPa. Ultrafine cemented carbide with high strength and high hardness is obtained.