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采用扫描电镜、能谱仪以及X射线衍射仪对具有WC+β(β为钴基粘结相)两相结构的WC-11Co-0.71Cr3C2-0.06RE(RE为含La、Ce、Pr、Nd的混合稀土)硬质合金烧结体表面进行观察与分析。结果表明,在烧结过程中合金中的La、Ce、Pr、Nd通过定向迁移与烧结炉内气氛中的S、O等杂质元素结合,在合金烧结体表面形成RE2S3(主)和RE2O2S(少量)弥散相。从合金中Cr3C2的热力学稳定性、Cr在Co中的溶解度特性以及稀土原子激发等3个方面,对稀土迁移活性的激发机制和稀土原子的定向迁移机制进行分析与讨论。
The structure of WC-11Co-0.71Cr3C2-0.06RE (RE is La, Ce, Pr, Nd) with WC + β (β is cobalt based binder phase) Mixed rare earth) cemented carbide sintered body surface were observed and analyzed. The results show that during the sintering process, La, Ce, Pr and Nd in the alloy are combined with S, O and other impurity elements in the atmosphere of the sintering furnace by directional migration to form RE2S3 (main phase) and RE2O2S (small amount) on the surface of the alloy sintered body. Diffuse phase. The excitation mechanism of rare earth migration activity and the directional migration mechanism of rare earth atoms are analyzed and discussed from three aspects of the thermodynamic stability of Cr3C2, the solubility characteristics of Cr in Co, and the rare earth atomic excitation.