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本文对钨—石墨高温钎焊接头的再熔化温度进行了研究.如用钛基钎料(Ti-10Ta)在真空中钎焊的温度为1600-1900℃.钎焊接头的再熔化温度达2500-3000℃。文章讨论了钎焊时间、钎焊温度、钎焊间隙及焊后扩散处理对钎焊接头再熔化温度的影响。结果表明,扩散处理及钎焊间隙对钎焊接头的再熔化温度有强烈的影响。文章还重点讨论了获得高的再熔化温度的钎焊接头的机理。研究表明,钎焊时,发生了钛与石墨的反应,形成了高熔点的TiC相;同时,钎焊接头中的其余成分也发生了变化,已不同于原始的钎料成分:钨溶解到钎焊接头中;钽含量有所提高等等。从而,钎焊接头的成分就由高熔点的TiC相和Ti-Ta-W难熔合金所组成。这样,在相应工艺的配合下,可得到高的再熔化温度(2500-3000℃)。
In this paper, the remelting temperature of tungsten-graphite high temperature brazed joints was studied, such as Ti-10Ta brazing in vacuum at a temperature of 1600-1900 ° C. The remelting temperature of the brazed joints reached 2500 -3000 ° C. The effects of brazing time, brazing temperature, brazing clearance and post-weld diffusion on the remelting temperature of brazed joints are discussed. The results show that the diffusion treatment and brazing gap have a strong influence on the remelting temperature of the brazed joint. The article also focuses on the mechanics of brazed joints for obtaining high remelting temperatures. The results show that when brazing, the reaction between titanium and graphite takes place and a high-melting TiC phase is formed. At the same time, the remaining components in the brazed joint also change, which is different from the original brazing filler metal. Welding head; tantalum content has increased and so on. Thus, the composition of the brazed joint consists of a high-melting TiC phase and a Ti-Ta-W refractory alloy. In this way, in the corresponding process with the match, you can get a high remelting temperature (2500-3000 ℃).