摘要
采用真空钎焊方法研究钎焊温度对SiC_p/Al复合材料钎焊接头组织性能的影响。选用Al-Cu-Mg系钎料,添加一定量的Ni元素,通过分析钎料金相和测量断裂应变值选择最优钎料,比较不同钎焊温度下接头的金相组织,并对接头的剪切强度进行测试分析。结果表明:当Ni质量分数为3%时,钎料的断裂应变值最高、塑韧性最好,相应的甩带成型性能最好;当钎焊温度从560℃升高到600℃时,SiC_p/Al复合材料接头的剪切强度随温度的升高先增加后降低,在最佳钎焊温度为570℃、保温30 min时,接头剪切强度达到最大值,为40.49 MPa;当钎焊温度超过570℃时,随着钎焊温度的升高,钎料层中金属元素的合金反应加剧,生成的金属间化合物会残留在焊缝中并与周边增强相之间形成弱连接,降低接头强度。
Using vacuum brazing technology,the effects of brazing temperature on microstructure and performance of brazed joints of SiCp/Al composite were investigated. By analyzing the metallographic structure and fracture strain value,the optimal brazing filler metal was selected from Al-Cu-Mg brazing filler metal with different Ni content. Meanwhile,the metallographic structure and shear strength of the joints with different brazing temperature were compared and measured. The results show that the brazing filler metal with 3% Ni content has the maximum fracture strain value,the greatest plasticity and toughness and the best melt-spinning moldability. Increasing the brazing temperature from 560 ℃ to 600 ℃,the shear strength of joint first increases and then decreases. With optimal brazing temperature of 570 ℃ and holding time of 30 min,the maximum shear strength reaches 40.49 MPa. When the brazing temperature exceeds 570 ℃,alloying reaction in filler metal will intensify with the increase of brazing temperature. The generated intermetallic compound will remain in the weld seam and form the weak connection between the weld seam and reinforcement in composite,which decreases the joint strength.
作者
高增
冯建广
王鹏
徐朝阳
牛济泰
GAO Zeng;FENG Jianguang;WANG Peng;XU Zhaoyang;NIU Jitai(He.nan Polytechnic University,Jiaozuo 454000,China;Henan Jingtai Aerospace High-tech Materials Technology Co.,Ltd,Jiaozuo 454000,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2018年第5期57-61,共5页
Ordnance Material Science and Engineering
基金
河南省科技攻关资助项目(182102210312)
河南省高等学校重点科研资助项目(15A430007)
