For high-temperature joining of SiC ceramics, a multi-element AuPdCoMnNi alloy was designed and used as filler metal to join SiC ceramics to metal Mo. The brazing experiment was conducted under the condition of 1150 °C for 5 min and 10 min, respectively. The results show that numerous micro-cracks are visible in the directly brazed Mo/SiC joints, which are continuously distributed in bands of (Co, Ni)-Si and (Pd, Ni)₂Si compounds. SiC was further joined to Mo using a Kovar interlayer under the same brazing conditions, and the metallurgical quality of the joints was evidently improved compared with the joints without this interlayer. The joining layer was mainly composed of (Au, Mn)_ss layer mixed with element C, (Fe, Co, Ni, Mo)-Si compound layer and (Fe, Co, Ni)-Si compound with discontinuous (Pd, Ni)₂Si phases and some small fragments of (Fe, Co, Ni, Mo)-Si compounds. In addition, the shear strength of the joints with Kovar interlayer reaches 55.36 MPa, remarkably higher than the void. The joining mechanism was also discussed.

中文翻译：

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用AuPdCoMnNi合金连接SiC陶瓷和金属Mo以及界面反应

对于SiC陶瓷的高温连接，设计了多元素AuPdCoMnNi合金作为填充金属，将SiC陶瓷连接到金属Mo上。在1150°C的条件下分别进行了5分钟和10分钟的钎焊实验。 。结果表明，在直接钎焊的Mo / SiC接头中可见许多微裂纹，这些裂纹连续分布在（Co，Ni）-Si和（Pd，Ni）₂ Si化合物的能带中。在相同的钎焊条件下，使用Kovar夹层将SiC进一步与Mo结合，与没有该夹层的接头相比，接头的冶金质量明显提高。接合层主要由（Au，Mn）_ss组成层与元素C，（Fe，Co，Ni，Mo）-Si化合物层和（Fe，Co，Ni）-Si化合物混合且具有不连续的（Pd，Ni）₂ Si相和（Fe，Co， Ni，Mo）-Si化合物。此外，具有科瓦合金夹层的接头的剪切强度达到55.36 MPa，明显高于空隙。还讨论了连接机制。