电焊机2026，Vol.56Issue(9)：46-57,12.DOI:10.7512/j.issn.1001-2303.2026.09.05
高熵复合钎料钎焊Si3N4/42CrMo异质接头焊缝组织调控与性能提升机制
Microstructure Control and Strengthening Mechanisms of Si3N4/42CrMo Dissimilar Joints Brazed with a High-Entropy Composite Filler Alloy
张晓航 1盛兰兵 1尹东坤 1沈宇 1佘春 1沈元勋1
作者信息
- 1. 中国机械总院集团郑州机械研究所有限公司 高性能新型焊接材料全国重点实验室,河南 郑州 450001
- 折叠
摘要
Abstract
In this study,FeCoNiCr high-entropy alloy particles were employed for the first time to reinforce an AgCuTi ac-tive brazing filler,enabling reliable brazing of Si3N4 ceramic to 42CrMo steel at 880℃for 10 min.A continuous reaction layer composed of TiN and Ti5Si3 formed at the Si3N4 interface.The brazing seam mainly consisted of Ag-rich and Cu-rich solid solutions,Cu-Ti phases,FCC-structured FeCoNiCr particles,Cr-rich phases,and Ti(CuFeCoNi)ₓ phases,while Cu-Ti and Fe₂Ti reaction products formed adjacent to the 42CrMo steel.The addition of FeCoNiCr particles altered the diffusion,dissolution,and reaction behavior of active Ti in the brazing seam,promoted the formation of multicomponent reaction phases,and suppressed the formation of coarse and continuous brittle Cu-Ti phases.An appropriate addition refined the brazing-seam microstructure and transformed the reaction products from continuous or blocky morphologies into fine and dispersed phases,thereby improving interfacial stress transfer and alleviating the thermal-expansion mismatch between the ceramic and metal.Excessive addition,however,reduced the fluidity and interfacial wettability of the filler,resulting in local agglomeration of FCC particles and reaction products and creating additional stress-concentration regions.At a FeCoNiCr content of 0.5 wt.%,the joint achieved a maximum shear strength of approximately 136 MPa,representing a 64%increase compared with the joint without FeCoNiCr.Meanwhile,the fracture mode changed from predominantly brittle fracture on the ceramic side to mixed fracture involving the ceramic,interface,and brazing seam,thereby improving the overall load-bearing stability of the joint.关键词
Si3N4陶瓷/异种材料钎焊/高熵合金/力学性能/界面组织Key words
Si3N4 ceramic/heterogeneous material brazing/high-entropy alloy/mechanical properties/interfacial microstructure分类
矿业与冶金引用本文复制引用
张晓航,盛兰兵,尹东坤,沈宇,佘春,沈元勋..高熵复合钎料钎焊Si3N4/42CrMo异质接头焊缝组织调控与性能提升机制[J].电焊机,2026,56(9):46-57,12.
