Cu-Pd-V钎料真空钎焊C_f/SiBCN复合材料的界面组织与性能
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摘要
利用Cu-Pd-V钎料对新型四元陶瓷基复合材料C_f/SiBCN进行了真空钎焊连接.利用座滴法研究了CuPd-V钎料对C_f/SiBCN复合材料的动态润湿性.利用SEM和XRD对钎焊接头微观组织及断口物相进行了分析表征.结果表明,经1 170℃保温30 min后钎料在复合材料上的润湿角为57°.在1 170℃-10 min钎焊规范下,CuPd-V钎料在C_f/SiBCN复合材料表面形成厚度约为1μm的V(C,N)反应层,主要包括VC和VN化合物,钎缝中央为Cu_3Pd和CuPd两种固溶体相.接头的室温三点弯曲强度为58.1 MPa,当测试温度提高至600℃时接头强度上升至90.2 MPa,在700和800℃测试温度下钎焊接头强度呈下降趋势,但仍然可以维持在室温强度水平,分别为66.9和64.6 MPa.
Cu-Pd-V filler alloy was used to join C_f/Si BCN composite. Its dynamic wettability on the composite was studied with the sessile drop method. After heating at1 170 °C for 30 min, the filler alloy showed a contact angle of57°. The microstructure and phase confirmation of the joint were analyzed by SEM and XRD, respectively. When brazed at 1 170 °C for holding time of 10 min, the interfacial reactions resulted in resulted in the formation of V(C,N) reaction band with the thickness of 1 μm at the surface of C_f/Si BCN composite, and the microstructure in the central part of the joint is composed of Cu3 Pd and Cu Pd solid solutions. The average three-point bend strength of C_f/Si BCN-C_f/Si BCN joints at room temperature is 58.1 MPa. When the test temperature was increased to 600 °C, the average joint strength was even elevated to 90.2 MPa. Eventhough the strength of brazed joints decreased at 700 °C and 800 °C, which was 66.9 MPa and 64.6 MPa respectively, it still maintained at room temperature strength value.
Cu-Pd-V filler alloy was used to join C_f/Si BCN composite. Its dynamic wettability on the composite was studied with the sessile drop method. After heating at1 170 °C for 30 min, the filler alloy showed a contact angle of57°. The microstructure and phase confirmation of the joint were analyzed by SEM and XRD, respectively. When brazed at 1 170 °C for holding time of 10 min, the interfacial reactions resulted in resulted in the formation of V(C,N) reaction band with the thickness of 1 μm at the surface of C_f/Si BCN composite, and the microstructure in the central part of the joint is composed of Cu3 Pd and Cu Pd solid solutions. The average three-point bend strength of C_f/Si BCN-C_f/Si BCN joints at room temperature is 58.1 MPa. When the test temperature was increased to 600 °C, the average joint strength was even elevated to 90.2 MPa. Eventhough the strength of brazed joints decreased at 700 °C and 800 °C, which was 66.9 MPa and 64.6 MPa respectively, it still maintained at room temperature strength value.
引文
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[6]Sun Y,Zhang J,Geng Y P,et al.Microstructure and mechanical properties of an Si3N4/Si3N4 joint brazed with Au-Ni-Pd-V filler alloy[J].Scripta Materialia,2011,64(5):414-417.
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[8]Liu W,Cao L M,Xu C H,et al.Processing and properties of the Cf/Si BCN ceramic matrix composites prepared by PIP[J].High Temperature Ceramic Matrix Composites 8:Ceramic Transactions,2014:248 335-343.
[9]Xiong H P,Chen B,Kang Y S,et al.Wettability of Co-V,and Pd Ni-Cr-V system alloys on Si C ceramic and interfacial reactions[J].Scripta Materialia,2007,56(2):173-176.
[10]Kim Y C,Saida K,Zhou Y H,et al.Selection of insert layer materials in Si3N4/steel joining[C]//Welding,Joining,Coating and Surface Modification of Advanced Materials,Proceedings the PreAssembly Symposium of 47th Annual Assembly of IIW,Vol.II,Dalian,China.1994:336-341.