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TiNiNb钎焊Cf/SiC与TC4接头组织结构

Brazed Joint of Cf/SiC to TC4 with TiNiNb filler materials

    摘要
  • 摘要: 文中在钎焊温度980℃、钎焊时间15 min的条件下，采用Ti54.8Ni34.4Nb10.8（原子分数，%）共晶合金粉末真空钎焊Cf/SiC复合材料与TC4钛合金.用SEM，EDS及差热分析法（DTA）观察测定了钎料组织、成分及熔点，分析了钎焊接头的微观组织结构.结果表明，Ti54.8Ni34.4Nb10.8共晶钎料由Ti2Ni及Ti（Nb，Ni）化合物组成，实际熔点为935℃.钎焊过程中，Ti和Nb元素与复合材料反应形成TiC和NbC混合反应层；钎料中的镍与TC4中的镍发生互扩散，在TC4钛合金侧形成扩散层；连接层由弥散分布的Ti（Nb，Ni）化合物和Ti2Ni相组成.Cf/SiC与连接层界面为接头最薄弱环节，此处易形成裂纹.

     

    Abstract: Cf/SiC composite and TC4 were successfully joined with the Ti54.8Ni34.4Nb10.8(at.%) filler materials at 980℃ for 15 min under the vacuum condition.The melting point of Ti54.8Ni34.4Nb10.8 alloy was measured by differential thermal analysis method (DTA). Microstructures of Ti54.8Ni34.4Nb10.8 alloy and the brazed joints were investigated by SEM,EDS. The results showed that Ti54.8Ni34.4Nb10.8 alloy consists of Ti2Ni and Ti(Nb, Ni) phases. In the brazing process, a reaction layer consisting of TiC and NbC formed at the Cf/SiC composite interface. A diffusion layer grew on the interface of TC4 alloy. In the bonding layer, the massive Ti(Nb, Ni) phases are distributed in Ti2Ni matrix. The Cf/SiC composite interface, where the crack generated easily, is the weakness position in brazed joints.

     

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