Cr元素对Ni基无硼钎料钎焊金刚石的组织及性能影响

针对B元素易使钎焊金刚石接头出现较多硬脆相的问题,制备一种新型Ni–Cr–Si–Cu–Sn无硼活性钎料,分析Cr元素对钎料组织和钎焊金刚石试样性能的影响规律。结果表明:Cr元素具有细化钎料晶粒和调控钎料中各元素分布的作用,可以提高钎料合金的显微硬度。当Cr元素质量分数过高时,会使钎料的熔点升高,钎料的润湿性能下降。综合来说,含有质量分数为15%的Cr的无硼钎料性能最佳,钎焊金刚石试样的磨削性能较优良,接头处出现多种形状的Cr_(7)C_(3)相,实现了钎料对金刚石的高强度连接。

Research progress of nickel based filler for development of diamond tools

Owing to diamond excellent physical and chemical properties,so synthetic diamond abrasives are extensively used in manufacturing diamond tools are utilized in machining hard and brittle materials.The brazing technology is exploited with strong bonding force between the diamond and substrate,which can realize metallurgical and chemical bonding between the filler metals and diamond abrasives.In this paper,the research reports on nickel-based fillers for brazing diamond grains at home and abroad in recent years are reviewed systematically,with emphasis on the influence of alloying elements and active elements on the properties of nickel-based fillers.The advantages and disadvantages of Cr,B,Si,P,Mn,Fe,Cu,W,C in nickel-based fillers and the negative effects of impurity elements were summarized.The shortcomings in the research and application of nickel-based fillers were pointed out,which provided theoretical guidance for further systematic research and development of related technologies.

添加ZrC增强相的Cu-Sn-Ti钎料真空钎焊金刚石的微观结构和磨削性能的研究

采用Cu-Sn-Ti-xZrC增强相复合钎料钎焊金刚石/45钢,实现其高强度连接。用扫描电镜,能谱仪、X射线衍射仪对真空钎焊后的金刚石和钎料界面层的宏观形貌和微观组织进行分析,同时通过维氏硬度计和磨擦磨损试验机对钎焊后金刚石的力学性能进行表征。结果表明:添加15wt.%ZrC的Cu-Sn-Ti钎料真空钎焊金刚石结合界面钎料铺展较均匀,金刚石的出露度较高,并且未出现明显裂纹等缺陷;金刚石表面有碳化物和少量的金属间化合物生成;随着ZrC含量的增加,界面处的硬度逐渐提高,且界面处的硬度高于基体和钎料层部分;添加15wt.%ZrC的钎焊接头磨损试验后的摩擦因数、磨削阻力及金刚石掉落率相对其他成分的较低,且被磨件的被去除量更大,这表明添加15wt.%ZrC的钎焊金刚石接头具有最佳的性能。