Composite brazing of C/C composite and Ni-based superalloy using (Ag-10Ti)+TiC filler material
Composite brazing of C/C composite and Ni-based superalloy using (Ag-10Ti)+TiC filler material
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使用(Ag-10Ti)TiC填充材料的C/C复合材料与镍基高温合金的复合钎焊
DOI：
10.1016/j.jmatprotec.2020.116886
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发表时间：
2021-02
影响因子：
6.3
通讯作者：
Shuhai Chen
中科院分区：
文献类型：
--
作者：
Yonglei Wang;Wanli Wang;Jihua Huang;Shuanbao Zhou;Jian Yang;Shuhai Chen
为降低C/C-GH 3044接头的残余热应力，采用Ag-Ti反应复合钎焊和TiC颗粒增强复合钎焊相结合的新型复合钎焊方法，采用（Ag-10 Ti）+TiC复合钎料实现了C/C复合材料与Ni基高温合金GH 3044的连接。结果表明，复合中间层中引入的TiC、原位合成的AgTi和Ti 2Ni相以及残余Ti颗粒等4种增强相对复合中间层起到了增强作用。随着TiC含量从0增加到32%，复合中间层的热膨胀系数下降了18.2%，这有助于缓解接头中的残余热应力。此外，TiC颗粒的引入降低了填料的流动性，抑制了GH 3044与填料之间的原子互扩散。结果表明，复合中间层中连续脆性化合物Ti 2Ni得到有效减少，复合中间层具有良好的塑性。同时，复合中间层厚度从260 μm逐渐增加到520 μm，有限元分析表明，对应的von Mises应力峰值降低了20.1%。在1020°C保温30 min时，（Ag-10 Ti）+24%TiC的接头剪切强度最高，达到67.2MPa，与本研究中所用的C/C复合材料基体的剪切强度相当。
With the aim of alleviating the residual thermal stress in the C/C-GH3044 joints, a novel composite brazing, which combines Ag-Ti reactive composite brazing and TiC particle-reinforced composite brazing, was adopted for joining C/C composite to Ni-based superalloy GH3044 using (Ag-10Ti)+TiC composite filler material. The results showed that the composite interlayer was strengthened by four kinds of reinforcements, containing the introduced TiC, thein situ synthesizedAgTi and Ti2Ni phases, and the residual Ti particles. With increasing TiC content from 0 to 32 %, the thermal expansion coefficient of the composite interlayer declined by 18.2 %, which is helpful in alleviating the residual thermal stress in the joints. In addition, the introduced TiC particles decreased the fluidity of the filler material and inhibited the inter-diffusion of atoms between GH3044 and filler material. As a result, the continuous brittle compound Ti2Ni in the composite interlayer was effectively reduced, so the composite interlayer had good plasticity. Meanwhile, the thickness of the composite interlayer gradually increased from 260 μm to 520 μm, and the finite element analysis showed that the corresponding peak value of von Mises stress decreasedby 20.1 %. The highest shear strength of the joints was 67.2 MPa obtained with (Ag-10Ti)+24 %TiC at 1020°C for 30 min,which is almost the same strength as the C/C composite matrix used in this study.
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