碳化硼陶瓷与高氮钢钎焊接头组织和性能研究

杨晶; 薛鹏; 张永锋; 房旭; 江晨雨; 石凯

doi:10.12073/j.hjxb.20230601001

碳化硼陶瓷与高氮钢钎焊接头组织和性能研究

Study on microstructure and properties of Boron Carbide ceramic brazed joints with high nitrogen steel

摘要

摘要: 使用 Ag-Cu-Ti 钎料实现了碳化硼(B₄C)陶瓷与高氮钢之间的可靠钎焊连接，研究了Ti元素含量对Ag-Cu-Ti 钎料润湿铺展性能的影响，分析了Ti元素影响钎焊接头界面组织的作用机制，并在室温条件下测试了钎焊接头的抗剪强度. 结果表明，当钎料Ag-Cu-Ti钎料中的Ti含量为4.5%时，钎料在B4C陶瓷与高氮钢上均表现出良好的润湿性能，铺展形貌良好，铺展面积更大，在钎焊温度910 ℃，保温时间25 min的焊接条件下，Ti含量为4.5%的钎料与B₄C陶瓷和高氮钢均实现了良好的冶金结合. 显微组织分析结果表明，钎焊接头组织在陶瓷侧反应层存在TiB和TiC，而在高氮钢侧反应层中出现了TiFe₂，TiN和CuTi₂，B₄C陶瓷/高氮钢钎焊接头的最大抗剪强度为54 MPa.

Abstract: The reliable joining between B₄C ceramic and high nitrogen steel was obtained using Ag-Cu-Ti filler metal. The wettability and spreadability of Ag-Cu-Ti filler metal with different Ti contents on B₄C ceramics and high nitrogen steel were studied, as well as the microstructure and shear strength of brazed joints were investigated. The results indicated that when the Ti content reaches 4.5wt%, the filler metal possess better wettability and spreadability effect on both B₄C ceramics and high nitrogen steel. The result of microstructure analysis indicated that TiC and TiB exist in the microstructure of brazing joints along ceramic side, while TiFe₂, TiN and CuTi₂ exist along steel side. As a result, the maximum shear strength of brazed joint reached 54 MPa,.

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