钎焊气氛对金刚石钎焊性能的影响

主要利用Cu-10Sn-5Ti钎料粉末,在空气、Ar气保护和真空气氛下分别对金刚石进行钎焊试验,通过扫描电子显微镜观测金刚石钎焊形貌、X射线衍射仪分析界面生成物成分、激光拉曼光谱仪检测金刚石石墨化程度、磨损试验分析金刚石破损形式等手段,考察研究不同钎焊气氛对金刚石钎焊性能的影响。试验结果表明,在空气中钎焊时,钎料粉末出现了一定的氧化,生成的氧化膜阻碍了界面反应的充分进行,对钎焊性能有一定的影响,金刚石也出现了较严重的热损伤,磨削过程中出现了少数部分颗粒脱落的情况;而在Ar气保护和真空钎焊时,钎料充分润湿和铺展,实现了对金刚石的高强度把持,金刚石石墨化程度很小,金刚石主要经历了完整、小块破碎、大块破损、磨平等正常磨损形式,金刚石利用率高。

Effect of Brazing Atmosphere on Brazing Performance of Diamond

Diamond grits are brazed with Cu-10Sn-5Ti alloy powder in air,vacuum and argon gas respectively,and the effect of brazing atmospheres on brazing performance is investigated through the analysis of morphological structure of brazed diamonds by scanning electron microscope,the phase composition between diamond and brazing alloy are detected by X-ray diffraction,the degree of graphite on diamond surface are analyzed by laser Raman spectroscopy,the wear characteristics of diamond are analyzed by wear test.The experimental test indicated that the brazing alloy powder appear oxidation and affect the interfacial reaction due to the oxidation film,the diamond grits appear thermal damage and graphitizing,and there are some grits pull-out during the grinding processing.The wett-ability of the Cu-10Sn-5Ti alloy to the diamond grits is improved in vacuum and argon gas,it realizes strong adhesion between diamonds and brazing alloy,and the graphitization of diamonds is not obvious.The brazed diamonds mainly occur integrity,micro-fracture,fracture and rubdown in grinding process.