【摘要】 利用粉末冶金熔渗技术制备出添加不同稀土的W-Cu-RE电触头材料。比较不同稀土对其组织和力学性能的影响,并通过扫描电镜分析电弧烧蚀后的微观组织形貌。结果表明,W-Cu合金中最适宜添加的稀土单质为La,它使粘结相Cu呈连续网络分布。W-Cu-RE电触头材料较传统的W-Cu合金抗电弧烧蚀性能有了明显提高,达到30%。主要原因是触头间产生的电弧由于稀土的加入更容易使金属Cu气化而带走大量热能,从而起到保护基体的作用。更多还原

【Abstract】 W-Cu contact materials containing different RE additives were prepared by powder metallurgy infiltration technology. Microstructure and properties of W-Cu contact materials containing different RE additives were compared, and the microstructure of the W-Cu alloys after arc erosion was observed by scanning electron microscope(SEM). The results show that RE La element that is the desirable RE additive can make Cu phase continuously to distribute in W-Cu contact alloy. Compared with that of conventional W-Cu alloy, the arc erosion resistance of W-Cu-RE contact materials is obviously improved by about 30%, which is attributed to more easy vaporization of Cu under the action of arc from the contacts due to the La addition to take away lots of heat.更多还原