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Characterization of interface of Al_2O_3-304 stainless steel braze joint

机译：Al_2O_3-304不锈钢钎焊接头界面的表征

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摘要

Sintered Al_2O_3 is brazed with 304 stainless steel (SS) using 97(Ag28Cu)3Ti active filler alloy at 900 and 1000 deg C. The interfaces developed during brazing have been systematically characterized and the results show that the thickness of the interfaces is 15-20 mu m and 10-15 mu m on SS side and Al_2O_3 side respectively. The presence of TiO, Cu_3Ti_3O and FeTi phases at the Al_2O_3 interface and FeTi, and Fe_(35)Cr_(13)Ni)3Ti)7 phases at the SS interface have been confirmed through XRD and TEM studies. Microhardness analysis across the brazed interfaces suggest that the SS interface (300-600 Hv) is harder than that of the SS substrate (200-250 Hv) whereas alumina interface (550-900 Hv) is softer than that of the alumina substrate (~ 1900 Hv). It is concluded that the various new phases that are formed during brazing are responsible for the variation in the hardness values.
机译：使用97（Ag28Cu）3Ti活性填充合金在900和1000摄氏度下用304不锈钢（SS）钎焊烧结的Al_2O_3。系统地表征了钎焊过程中形成的界面，结果表明界面的厚度为15-20在SS侧和Al_2O_3侧分别为10μm和10-15μm。通过XRD和TEM研究已经证实，在Al_2O_3界面处存在TiO，Cu_3Ti_3O和FeTi相，在SS界面处存在FeTi和Fe_（35）Cr_（13）Ni）3Ti）7相。钎焊界面的显微硬度分析表明，SS界面（300-600 Hv）的硬度比SS基板（200-250 Hv）的硬度高，而氧化铝界面（550-900 Hv）的硬度比氧化铝基板（〜 1900 Hv）。结论是，在钎焊期间形成的各种新相是硬度值变化的原因。

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