CAJ | 학술논문

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。
채용소묘전경、능보의이급 X 사선연사의대구유 WC+β(β위고기점결상)량상결구적 WC-11Co-0.71Cr3C2-0.06RE (RE위함La、Ce、Pr、Nd 적혼합희토)경질합금소결체표면진행관찰여분석。결과표명，재소결과정중합금중적La、Ce、Pr、Nd통과정향천이여소결로내기분중적S、O등잡질원소결합，재합금소결체표면형성RE2S3(주)화RE2O2S(소량)미산상。종합금중Cr3C2적열역학은정성、Cr재Co중적용해도특성이급희토원자격발등3개방면，대희토천이활성적격발궤제화희토원자적정향천이궤제진행분석여토론。
The as-sintered sinter skin of WC-11Co-0.71Cr3C2-0.06RE cemented carbide with WC+βmicrostructure was analyzed by scanning electron microscope, energy dispersive X-ray spectroscope and X-ray diffractometer. RE represents La-, Ce-, Pr- and Nd-containing mischmetal, andβis cobalt-based binder phase. It was discovered that La, Ce, Pr and Nd migrated directionally from the alloy to the sinter skin to combine with the impurity elements S and O from the sintering atmosphere during the sintering process. As a result, main dispersed phase RE2S3 and minor RE2O2S were formed in situ on the sinter skin. The mechanisms for the stimulation of the migration activity and the directional migration of RE atoms were discussed in terms of the thermodynamics stability of Cr3C2, solubility characteristic of Cr in Co and the polarization or ionization of RE atoms.