添加Ni-Cr-B-Si的Cu基复合钎料真空钎焊金刚石界面微结构

摘要/Abstract

摘要： 为了降低钎焊金刚石的热损伤和调控钎料性能，采用添加适量Ni-Cr-B-Si的Cu基钎料对金刚石磨粒进行真空钎焊试验。采用扫描电镜、能谱仪和X射线衍射仪对金刚石焊后形貌、界面微结构、钎料组织进行了分析。结果表明：添加20%Ni-Cr-B-Si的CuSn混合粉能够与金刚石实现化学冶金结合，金刚石热损伤降低明显，焊后形貌完整，表面基本光滑，并在金刚石表面的不同晶面生成了不同类型和形貌的碳化物。钎料凝固过程中首先析出α-Cu枝晶，经过包晶转变和共析转变，形成了α-Cu枝晶、Cu5.6Sn、Cu3Sn、Ni3Sn和共析α-Cu。随着Ni-Cr-B-Si含量的增大，钎料的硬度在增大，当添加量为20%时，硬度达到360~400HV0.2。

关键词: 真空钎焊, 金刚石, Ni-Cr-B-Si, 碳化物, Cu基钎料

Abstract: In order to reduce the heat damages of the diamonds and to adjust the properties of the filler metals, Cu-based composite filler metals adding Ni-Cr-B-Si were used to carry out the vacuum brazing experiments on diamond abrasives. The morphology and microstructure of the diamonds and the brazing filler metals were analyzed by scanning electron microscope(SEM), energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD) respectively. The results show that the composite filler metals of CuSn powder adding Ni-Cr-B-Si at 20% is suitable for brazing the diamonds, which may realize the chemical metallurgical bonding with the diamonds. The thermal damage of diamonds is obviousty reduced, the morphology of the diamonds is intact, the surfaces are smooth and there are different carbides with specific morphology formed on the different crystal faces of the diamonds. In the solidification processes of the filler metals, α-Cu dendrites separate out firstly, then through the peritectic and eutectoid transformations, α-Cu dendrites, Cu5.6Sn, Cu3Sn, Ni3Sn and α-Cu are finally formed. With the content of Ni-Cr-B-Si increasing, the hardness of the brazing filler metals improves, which can reach 360-400 HV when the content of Ni-Cr-B-Si is as 20%.

Key words: vacuum brazing, diamond, Ni-Cr-B-Si, carbide, Cu-based composite filler metal

中图分类号:

TG401

卢金斌1，2;李华1，2;刘威1，2;钟素娟3;马佳3. 添加Ni-Cr-B-Si的Cu基复合钎料真空钎焊金刚石界面微结构[J]. 中国机械工程.

LU Jinbin1,2;LI Hua1,2;LIU Wei1,2;ZHONG Sujuan3;MA Jia3. Interfacial Microstructure of Diamond Vacuum Brazed with Cu-based Composite Filler Metals Adding Ni-Cr-B-Si Alloy[J]. China Mechanical Engineering.

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