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以锌熔回收料为原料,用常规硬质合金生产工艺制备出再生WC-8Co硬质合金试样;用X射线衍射金相显微镜、场发射扫描电子显微镜/EDS能谱分析等测试方法研究了不同稀土钇添加方式制备的再生WC-8Co硬质合金孔隙、孔隙度、杂质形态及成分的差异,并采用截距法测量了WC晶粒尺寸及晶粒度分布。研究结果表明:添加稀土钇可抑制WC晶粒的非均匀长大,在一定程度上减小再生硬质合金的WC晶粒尺寸;可以显著减少再生硬质合金中的A类和B类孔隙,降低合金的孔隙度;稀土钇与杂质元素结合能够改善杂质相形态,由不规则和棒状Ca-S-O相转变为球状或类球形的Ca-Y-S-O相,并显著细化杂质相尺寸;采用复合粉的稀土添加方式使稀土钇元素分布更为均匀,微观组织和含稀土杂质相的均匀细化效果更加显著。
Recycled WC-8Co cemented carbide samples were prepared by conventional cemented carbide process with zinc melt recycled materials as raw materials. X-ray diffraction metallography, field emission scanning electron microscopy (EDS) and energy dispersive spectroscopy The porosity, porosity, impurity morphology and composition of regenerated WC-8Co cemented carbide prepared by different rare earth yttrium additions were measured. The grain size and grain size distribution of WC were measured by intercept method. The results show that the addition of rare earth yttrium can suppress the non-uniform growth of WC grains and reduce the WC grain size of regenerated cemented carbide to a certain extent. It can significantly reduce the A and B porosity of regenerated cemented carbide, And reduce the porosity of the alloy. The combination of rare earth yttrium and impurity elements can improve the impurity phase morphology, from irregular and rod Ca-SO phase into spherical or spheroidal Ca-YSO phase, and significantly refine the impurity phase size; The addition of rare earth makes the distribution of yttrium in rare earth more uniform, and the effect of uniform refinement of microstructure and impurity phase containing rare earth is more remarkable.