【摘要】 本文用Ni基合金在15秒内升温至1050℃高频感应钎焊镀钛金刚石和无镀层金刚石。通过电镜、能谱和X射线衍射等测试分析了金刚石和钎料界面之间的微观结构。结果显示,钎焊镀钛金刚石表面的碳化铬法向生长且较为致密,钎焊无镀层金刚石表面的碳化铬切向生长且较为疏松。进一步特别设计的实验表明,正是镀钛层改变了钎焊金刚石表面的碳化铬形态。研磨实验证实,法向生长且较为致密的碳化铬同金刚石表面的结合强度较高。更多还原

【Abstract】 In the paper two types of diamond were brazed with Ni-based filler alloy by high-frequency induction under argon atmosphere at 1050 ℃ within 15 seconds.The interfacial microstructures between brazed diamond and the filler alloy were analyzed by scanning electron microscopy,energy dispersion spectrometer and X-ray diffraction.It is surprisingly found that Cr-carbides form normally and compactly on Ti-coated diamond brazed surface,whereas Cr-carbides form tangentially and loosely on uncoated diamond brazed surface.Furthermore,the suggestion that Ti changed the morphology of Cr-carbides on Ti-coated diamond brazed surface was discussed and confirmed by the further tests specially designed.The abrading experiment results for the brazed diamonds showed that the bonding strength between the normally formed Cr-carbides and the diamond is higher than that between Cr-carbides and uncoated diamond.更多还原