Molybdenum-fiber strengthened brazing of carbon/carbon composite and nickel-based superalloy
Molybdenum-fiber strengthened brazing of carbon/carbon composite and nickel-based superalloy
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碳/碳复合材料与镍基高温合金的钼纤维强化钎焊
DOI：
10.1016/j.matdes.2022.111101
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发表时间：
2022-08
影响因子：
8.4
通讯作者：
Jihua Huang
中科院分区：
文献类型：
--
作者：
Zhihang Hou;Wanli Wang;Duohuan Niu;Zheng Ye;Jian Yang;Shuhai Chen;Jihua Huang
碳/碳（C/C）复合材料与金属的牢固可靠连接在航空航天领域具有重要的应用价值。然而，当连接两种不同材料时，低的界面结合强度仍然是一个持续的问题，并导致低的连接强度。在这项工作中，一种新的界面强化钎焊连接C/C复合材料和镍基高温合金（GH 3044）已经开发出来。连接前，在C/C复合材料表面种植高强度钼（Mo）纤维，然后用BNi-2钎料将纤维处理后的C/C复合材料钎焊到GH 3044高温合金上。结果表明，钎焊接头中Mo纤维穿过C/C基体与钎焊层界面，具有良好的连接性能。由于钼纤维的钉扎作用，增加了连接界面面积，有效地防止了裂纹的产生。因此，粘合接头具有优异的机械性能。接头的最大剪切强度为60 MPa，是未植纤维接头的2.14倍。接头的最大三点弯曲强度为31 MPa，是未植纤维接头的2.58倍。
The robust and reliable joining of carbon/carbon (C/C) composites and metals has important application value in the aerospace field. However, the low interface bonding strength when joining the two dissimilar materials remains a persistent problem and leads to low joint strength. In this work, a novel interface strengthened brazing process has been developed for joining a C/C composite and a nickel-based superalloy (GH3044). Before joining, high-strength molybdenum (Mo) fibers are planted on the surface of the C/C composite, then the fiber-treated C/C composite is brazed to the GH3044 superalloy using a BNi-2 filler. The results show that a sound joint with robust Mo fibers crossing the interface between the C/C substrate and the brazing layer is obtained. Owing to the pinning effect of the Mo fibers, the joining interface area is increased and cracking is effectively prevented. As a result, the bonded joint exhibits excellent mechanical properties. The maximum shear strength of the joint was measured to be 60 MPa, which is 2.14-times that of the joint without fiber-planting. The maximum three-point bending strength of the joint was measured at 31 MPa, which is 2.58-times that of the joint without fiber-planting.
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