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首页> 外文会议>International Conference on Proceeding amp; Manufacturing of Advanced Materials; 20060704-08; Vancouver(CA) >Selection and Design of Brazing Fillers for Metal-Ceramic Joints
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Selection and Design of Brazing Fillers for Metal-Ceramic Joints

机译：金属陶瓷接头钎料的选择与设计

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摘要

Three different approaches for metal to ceramic brazing are compared using the example of Si_3N_4/TiN-steel joints: the use of an active filler metal (single layer brazing system), the metallisation of the ceramic and brazing with a non active filler (two-layer brazing system), the use of a composite brazing filler system (three layer brazing system). Different aspects are analysed: the development of the joint's microstructure in the as-brazed state, the thermally induced residual stresses and the resulting bend strength of the joint's strength. With two layers and three layers brazing system, bend strength of about 400 Mpa, about 15% higher then single filler metal, were achieved. The three layer brazing system has two advantages: firstly one step processing secondly lower scattering of joint bend strength compared to two layers brazing system. The key factors in all cases are the selection of the brazing fillers and the braze design. In all cases a careful selection of the brazing fillers and the braze design are the key factors. The first criteria for the selection of the brazing fillers for joints of dissimilar materials can be done by considering only the main filler characteristics like titanium content, processing temperature and yield stress. It's necessary to simulate the joint behaviour by finite element simulation for verifying the final selection of filler metals. It was clearly seen that the plasticity of the filler metal is the main factor affecting residual stresses for the joint geometry in this current work.
机译：以Si_3N_4 / TiN钢接头为例，比较了三种不同的金属陶瓷钎焊方法：使用活性填充金属（单层钎焊系统），陶瓷金属化和使用非活性填料钎焊（两种层钎焊系统），使用复合钎料系统（三层钎焊系统）。分析了不同方面：钎焊状态下接头的微观结构的发展，热诱导的残余应力以及接头强度的弯曲强度。使用两层和三层钎焊系统，可获得约400 Mpa的弯曲强度，比单一填充金属高约15％。三层钎焊系统具有两个优点：首先，一步加工，其次，与两层钎焊系统相比，接头弯曲强度的散射更低。在所有情况下，关键因素都是钎料的选择和钎焊设计。在所有情况下，仔细选择钎焊填料和钎焊设计都是关键因素。选择异种材料接头的钎料的第一个标准可以通过仅考虑主要的填料特性（例如钛含量，加工温度和屈服应力）来确定。为了验证填充金属的最终选择，必须通过有限元模拟来模拟接头行为。可以清楚地看到，在当前的工作中，填充金属的可塑性是影响接头几何形状残余应力的主要因素。

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