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发表于 2009-1-8 23:11:07
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Summary
This study showed that yttria stabilized zirconia can be brazed to 444 stainless steel by in-situ alloying of pure Ni-Ti foils at temperatures around 1000°C. The best brazes were produced when brazing for 60 minutes at 1010°C and 30 minutes at 1030°C. Four different regions were identified across the braze metal which were influenced by the interactions of the Ni/Ti alloy with the metal and ceramic substrates. Significant interactions occurred between the Ni/Ti braze metal and the stainless steel. Cr and Fe were found to diffuse into the braze metal, but did not reach a narrow braze metal band near the YSZ. There was little interaction between the braze metal and the YSZ, but a strong bonding was produced at this interface. It is speculated that the bonding occurred due to the localized reduction of ZrO2 and oxidation of Ti that formed a solid solution.
概要
此文验证了氧化钇稳定的氧化锆在1000°C下可以使用纯镍、钛箔现场配制的合金进行钎焊444不锈钢。1010℃钎焊60分钟,1030℃钎焊30分钟可以达到最好效果。试验发现了钎焊金属由于受ni/ti合金与金属及陶瓷基的相互作用而影响的四个不同区域。主要是焊材ni/ti与不锈钢基体之间的相互作用,cr及fe有向焊材金属扩散的现象,但近YSZ处很窄一部分焊材金属不发生类似相互作用。焊材金属与YSZ也能溶合得非常牢固但是彼此几乎没有相互作用或影响,据推测接触面处的溶合是由于局部收缩的ZrO2与氧化钛生成固溶体。 |
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