Al2O3/SUS304 Brazing via AgCuTi-W Composite as Active Filler

作者：Su, Cherng Yuh^*; Zhuang, Xie Zongyang; Pan, Cheng Tang

来源：Journal of Materials Engineering and Performance, 2014, 23(3): 906-911.

DOI：10.1007/s11665-013-0837-z

• brazing
• interfacial microstructures
• mechanical properties
• W particles

Alumina ceramic (alpha-Al2O3) was brazed to stainless steel (SUS304) using an Ag-Cu-Ti W composite filler and a traditional active brazing filler alloy (CuSil-ABA). Then, the effects of the presence of W particles and of the brazing parameters on the microstructures and mechanical properties of the brazed joints were investigated. The maximum tensile strength of the joints obtained using Ag-Cu-Ti W composite filler was 13.2 MPa, which is similar to that obtained using CuSil-ABA filler (13.5 MPa). When the joint was brazed at 930 A degrees C for 30 min, the tensile strengths decreased for both kinds of fillers, although the strength was slightly higher for the Ag-Cu-Ti W composite filler than for the Ag-Cu-Ti filler. The interfacial microstructure results show that the Ti reacts with W to form a Ti-W-O compound in the brazing alloy. When there are more W particles in the brazing alloy, the thickness of the Ti (X) O (Y) reaction layer near the alumina ceramic decreases. Moreover, W particles added to the brazing alloy can reduce the coefficient of thermal expansion of the brazing alloy, which results in lower residual stress between the Al2O3 and SUS304 in the brazing joints and thus yields higher tensile strengths as compared to those obtained using the CuSil-ABA brazing alloy.

• 出版日期2014-3
• 单位中山大学