摘要
设计了CoNi(Si,B)CrTi和CoFeNi(Si,B)CrTi两种成分的钴基钎料,对SiC陶瓷进行了钎焊试验。结果表明CoFeNi(Si,B)CrTi钎料可用于SiC陶瓷的钎焊。钎料/SiC界面由多层硅化物和TiC条带组成,钎缝中央的基体为Co-Fe-Ni-Cr-Ti-Si相和Fe-Co-Cr-Ni金属相,其上弥散分布着许多细小的TiC颗粒。在1150℃/10 min,采用120μm厚的CoFeNi(Si,B)CrTi钎料钎焊的SiC接头室温四点弯曲强度最高,为161 MPa,且该接头具有稳定的高温强度,室温、700和800℃下钎焊接头的三点弯曲强度分别为176,178和184 MPa。
SiC ceramics was brazed with two kinds of newly-designed Co-based filler metals,CoNi（Si,B）CrTi and CoFeNi（Si,B）CrTi.The results showed that the CoFeNi（Si, B）CrTi filler metal could be used for the brazing of SiC ceramics.The reaction layer at the interface between SiC and the filler metal was composed of multilayer silicides and TiC band.In the central part of the joint,many small TiC particles distributed scatteringly in the matrix of Co-Fe-Ni-Cr-Ti-Si phase and Fe-Co-Cr-Ni phase.The maximum joint room-temperature four-point bend strength of 161 MPa was achieved under the optimum brazing condition of CoFeNi（Si,B）CrTi filler metal,120 μm thickness of the filler metal foils,brazing temperature of 1150 ℃,brazing time of 10 min.The joint exhibited stable high-temperature strength,and the joints gave the average three-point bend strength of 176,178 and 184 MPa at room temperature,700 and 800 ℃,respectively.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2007年第6期766-771,共6页
Chinese Journal of Rare Metals
基金
国家自然科学基金资助项目(59905022
50475160)
关键词
SIC陶瓷
钎焊
接头组织
接头强度
SiC ceramic
brazing
joint microstructure
joint strength
