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采用基于高温煅烧-破碎法、S含量为0.004 3%的WC-Co再生复合粉末为原料,制备脱碳(含η相)与正常碳含量2种控碳水平的WC-12%Co和WC-12%Co-0.05%Y_2O_3的合金。扫描电镜与X射线衍射分析与观察结果表明,在合金烧结体表面均观察到了明显的CaS杂质富集相。合金烧结体表面CaS物相的形成,可以抑制稀土的表面迁移,不会破坏WC晶粒的结晶完整性,不会对合金抗弯强度产生不利影响,正常控碳水平的合金具有高强度特征。烧结过程中杂质的迁移不会对合金微观组织结构产生不利影响,合金微观组织结构为典型的粗细随机搭配非均匀结构,WC晶粒结晶完整。0.05%Y_2O_3的添加,有利于WC晶粒邻接度的降低,有利于合金中WC晶粒结晶完整性的进一步改善,使合金硬度提升0.6 HRA。
WC-12% Co and WC-Co were prepared by using high-temperature calcining-crushing method with WC-Co regenerated composite powder with 0.004 3% S content. 12% Co-0.05% Y_2O_3 alloy. Scanning electron microscopy and X-ray diffraction analysis and observation results show that the obvious CaS impurity-enriched phase is observed on the surface of the alloy sintered body. The formation of CaS phase on the surface of the alloy sintered body can restrain the surface migration of the rare earth, does not destroy the crystal integrity of the WC grains, does not adversely affect the bending strength of the alloy, and the alloy with the normal carbon control level has the characteristics of high strength. During the sintering process, the migration of impurities will not adversely affect the microstructure of the alloy. The microstructure of the alloy is a random combination of typical thickness and non-uniform structure, and the WC crystal grains are completely crystallized. The addition of 0.05% Y_2O_3 is conducive to the reduction of WC grain contiguity, which is conducive to the further improvement of the crystal grain integrity of the WC grain and the hardness of the alloy by 0.6 HRA.