SiC-石墨复相陶瓷的反应连接法焊接特性

Welding properties of SiC-graphite composite ceramics prepared by reaction bonding route

为研究料浆涂覆工艺及反应连接法焊接Si C-石墨复相陶瓷的焊接特性,以w(Si C)=95%、w(石墨)=0的SG0和w(Si C)=65%、w(石墨)=30%的SG30两种陶瓷材料为母材,以硅粉和活性炭粉按n(Si)n(C)=1 1.2配制的65%固相体积分数的混合料浆(分散介质为酚醛树脂和酒精)为焊料,采用涂覆法及反应烧结工艺进行Si C-石墨复相陶瓷的焊接,并对焊接接头的抗弯强度、焊缝的显微形貌以及物相组成进行了测试及分析。结果表明:焊缝具有与母材类似的微观结构及物相组成,焊缝与基体结合紧密;对比SG0-SG30和SG30-SG30两种焊接试块的抗弯强度,其中具有同质母材的焊接试块SG30-SG30的接头抗弯强度较高,达到了81.96 MPa。

In order to research the welding properties of SiC-graphite composite ceramics welded by slurry coating method and reaction bonding route,the SiC-graphite composite ceramics were welded using SG0 （ SiC 95 mass%, graphite 0 mass% ） and SG30 （ SiC 65 mass%, graphite 30 mass% ） as mother materials, 6.5% （solid volume fraction） mixing slurry of silicon powder and activate carbon powder （n（Si）： n（C） =1 ： 1.2） as welding material. The flexural strength, microstructure and phase composition of.the welding joints were investigated. The results show that the welding joints have the similar microstructure and phase composition with the mother materials, and they joint with matrix closely Compared with the specimen SG0-SG30,the specimen SG30-SG30 with homogenous mother materials has higher flexural strength, reaching 81. 96 MPa.