For geological diamond bits Fe–Co–Cu alloys are the a generation of metal matrix. In this paper, the Fe–Co–Cu pre-alloys with various chemical compositions were synthesized using the co-precipitation method, which were subsequently sintered at different temperatures. The structural, thermal and properties of the powders and its sintered materials were characterized by various techniques. X-ray diffraction studies indicated that solid solutions were formed for the alloys during co-precipitation process. Microstructures of these pre-alloyed powders exhibited that the sintering process was facilitated by the irregular shapes, interconnected fine particles as well as the large surface areas. The thermal effects of the pre-alloyed powders were explored by differential scanning calorimetry. The optimal sintering temperature for each pre-alloyed powder was determined by the mechanical analysis. Scanning electron microscopic results show that the composition ratio of Fe and Cu had a significant impact on the microstructures of the sintered materials, and the 65%Fe-20%Cu-15%Co alloy reached the best surface coverage over the diamond bits. The drilling performances for various pre-alloyed powders were verified by micro-drilling experiments. Those results suggested that the 65%Fe-20%Cu-15%Co alloy exhibited the optimal performance for application in geological diamond drilling bits.

中文翻译：

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地质金刚石钻头用Fe-Co-Cu预合金粉的组织和性能

对于地质金刚石钻头，Fe–Co–Cu合金是一代金属基体。在本文中，使用共沉淀法合成了具有各种化学成分的Fe-Co-Cu预合金，然后在不同温度下烧结。通过各种技术对粉末及其烧结材料的结构，热和性能进行了表征。X射线衍射研究表明，在共沉淀过程中，合金形成了固溶体。这些预合金粉末的微观结构表明，不规则形状，相互连接的细颗粒以及较大的表面积促进了烧结过程。通过差示扫描量热法研究了预合金粉末的热效应。通过机械分析确定每种预合金粉末的最佳烧结温度。扫描电子显微镜结果表明，Fe和Cu的组成比对烧结材料的显微组织有显着影响，并且65％Fe-20％Cu-15％Co合金的表面覆盖率超过金刚石钻头。通过微钻孔实验验证了各种预合金粉末的钻孔性能。这些结果表明65％Fe-20％Cu-15％Co合金在地质金刚石钻头中显示出最佳性能。65％Fe-20％Cu-15％Co合金在金刚石钻头上达到了最佳的表面覆盖率。通过微钻孔实验验证了各种预合金粉末的钻孔性能。这些结果表明65％Fe-20％Cu-15％Co合金在地质金刚石钻头中显示出最佳性能。65％Fe-20％Cu-15％Co合金在金刚石钻头上达到了最佳的表面覆盖率。通过微钻孔实验验证了各种预合金粉末的钻孔性能。这些结果表明65％Fe-20％Cu-15％Co合金在地质金刚石钻头中显示出最佳性能。