摘要
使用Ni-Cr合金在保护气氛炉中制备钎焊金刚石试样,使用扫描电镜、激光拉曼光谱、ZMC-Ⅱ型金刚石抗压强度测试仪和TI-03型冲击试验机等分析了钎焊后金刚石颗粒的形貌和力学性能。结果表明:钎焊后金刚石颗粒产生石墨化、化学侵蚀和裂纹;金刚石石墨化程度非常小,主要发生在金刚石颗粒表面;化学侵蚀比较明显;在金刚石和Ni-Cr合金钎料界面处产生的较大残余应力导致金刚石表面产生裂纹;金刚石颗粒的抗压强度和热冲击韧性分别降低23%和58.4%。
The sample of brazed diamond was prepared with Ni-Cr alloy in protective atmosphere furnace. Scanning electron microscope, laser Raman spectrum, ZMC-II type diamond compressive strength tester, and TI-03 fiiability index tester were used to investigate the morphologies and mechanical properties of brazed diamond grits. The results show that it forms graphitization, chemical erosion and crack on the surface of diamond grits. The graphitization of diamond is very small and it only appears on the surface of the diamond. The chemical erosion is very apparent, and the high residual stress at interface between diamond and Ni-Cr alloy results in crack on the surface of diamond. The compressive strength and TTI of brazed diamond grits decrease by 23% and 58.4% respectively.
出处
《热加工工艺》
CSCD
北大核心
2017年第9期221-223,227,共4页
Hot Working Technology
基金
国家级大学生创新创业训练项目(201511305025)
蚌埠学院自然科学研究项目(2015ZR09
2015ZR011)
