高频感应钎焊金刚石界面特征

Interfacial characteristics of diamond brazed by high-frequency induction

讨论了在相同高频感应钎焊工艺条件下用两种不同成分的NiCr钎料钎焊镀Ti金刚石和无镀层金刚石的界面特征。利用扫描电镜、能谱仪和X射线衍射研究了深腐蚀处理后的钎焊金刚石颗粒。结果表明,钎料成分不同、金刚石镀Ti与否,金刚石表面生成的碳化物成分和形态各异。钎焊镀Ti金刚石表面的碳化物致密且呈法向生长,而钎焊无镀层金刚石表面的碳化物疏松且切向生长。钎焊金刚石颗粒的研磨试验证实,界面碳化物成分和形态的不同决定了它们同金刚石结合强度的高低。

The interfacial characteristics of the Ti-coated diamonds and uncoated diamonds was investigated. The interfaces were brazed by high-frequency induction with two kinds of NiCr alloys on the same conditions. The grains brazed by high-frequency induction were immerged into the mixed acids for several hours and then rinsed with acetone. The interfacial characteristics of the grains were studied with scanning electron microscope, energy dispersion spectrometer and X-ray diffraction. The results show that the composition and the shape of carbides of the brazed diamond grains are different when different solders were used to braze diamonds with or without Ti coatings. The Cr-carbides of brazed Ti-coated diamond grains are normally and compactly formed, whereas, the Cr-carbides on the surface of brazed uncoated diamond are tangentially and loosely formed. The abrasive experiment indicates that the bond strengths between the carbide and the diamonds are also different with different carbides.