ZrO_2陶瓷与310S不锈钢反应空气钎焊接头的组织与性能

Microstructure and mechanical properties of reactive air brazed joints of ZrO_2 ceramic and 310S stainless steel

在钎焊温度1 050℃,保温时间15 min的工艺条件下,采用的Ag-n(CuO)x(x=2%,4%,6%,8%)钎料对ZrO_2陶瓷与310S不锈钢进行反应空气钎焊连接。利用扫描电镜(SEM)、电子探针(EPMA)及X射线衍射仪(XRD)对接头的界面组织和钎焊机理进行了研究,分析了CuO含量对接头组织和力学性能的影响。结果表明:Ag-CuO钎料在空气气氛下可以实现ZrO_2陶瓷和310S不锈钢的钎焊,ZrO_2陶瓷与钎料没有发生反应,310S不锈钢与钎料反应在界面处生成了复合氧化物反应层。随着钎料中CuO含量的升高,ZrO_2陶瓷侧的组织没有明显的变化,310S不锈钢侧的复合氧化物反应层逐渐增厚,接头强度则随着CuO含量的增加先提高后降低,在钎料中n(CuO)为4%时,接头抗剪强度达到最大值为69 MPa。

ZrO_2 ceramic and 310 S stainless steel were reactive air brazed using Ag-n(CuO)x(x=2%, 4%, 6%,8%) brazing filler at 1 050 ℃ for 15 min. The typical microstructure and brazing mechanism of the joints were investigated with SEM, EPMA and XRD, the effects of CuO content on the interfacial microstructure and mechanical properties of the joints were analyzed. The results showed that ZrO_2 ceramic and 310 S stainless steel were sucessfully brazed using Ag-CuO brazing filler in air, no reaction occurred between ZrO_2 ceramic and brazing filler, a mixed oxides reaction layer was formed along the steel interface due to the reaction between 310 S and brazing filler. With increaing CuO content, the microstructure near the ZrO_2 side changed unsignifcant, while the mixed oxides reaction layer on the 310 S side became thick, the shear strength of the brazed joint showed a distint changed with the different CuO content, the maximum shear strength of 69 MPa was achieved using n(CuO) 4% braze composition.