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陶瓷以优良的性能正成为极具潜力的新型结构材料 ,在其应用过程中往往需与金属连接 ,但因两者间的组织结构及物化性质相差悬殊 ,往往得不到满意的连接结果。在陶瓷与金属间用一定厚度的成分和结构呈梯度变化的梯度过渡层作为连接二者的焊缝层 ,是解决陶瓷与金属连接时所存在问题的较好措施之一。本文将自蔓延高温合成技术引入焊接领域 ,探索了陶瓷 -金属焊接时接头中梯度过渡层的制备工艺。试验结果表明 ,采用自蔓延高温合成技术可成功地制取陶瓷—金属的梯度过渡层 ,这种过渡层可以有效地缓和因线膨胀系数差在陶瓷 -金属焊接时界面处所产生的热应力 ,为获得综合性能良好的异种材料焊接接头开辟了一条新途径。
Ceramics are becoming promising new structural materials with excellent properties. They are often linked to metal during their application. However, the structural and physicochemical properties of the ceramics are not the same. Therefore, satisfactory connection results are often not obtained. In ceramic and metal with a certain thickness of the composition and gradient gradient structure of the transition layer as the connection between the two seam layer is to solve the ceramic and metal connection problems when one of the better measures. In this paper, self-propagating high-temperature synthesis technology into the field of welding to explore the ceramic-metal welding gradient transition layer in the preparation process. The experimental results show that the ceramic-metal gradient transition layer can be successfully prepared by SHS technique. The transition layer can effectively reduce the thermal stress caused by the difference of linear expansion coefficient at the ceramic-metal interface. Get a good overall performance of dissimilar materials welded joints opened up a new way.