Alumina and monel superalloy was successfully joined by active metal brazing technique using Ticusil (68.8Ag-26.7Cu-4.5Ti in wt%) filler alloy in a vacuum furnace at 910°C for 10 min under a vacuum of 5×10–6 Torr. Phase analysis of the monel-filler alloy and alumina-filler alloy interfaces was conducted by X-ray diffraction analysis. Interfacial and cross-sectional microstructural investigation and determination of elemental composition were performed by scanning electron microscopy and energy dispersive X-ray analysis. No crack was found at the joint interfaces after thermal cycling test for 100 cycles between 50° and 600°C. Microhardness was estimated by Vickers hardness tester at the cross-section of the joint after thermal cycling test. Typical brazing strength of the thermally cycled joint was above 23 MPa. Helium leak tests indicated good hermiticity of the thermally cycled brazed joints. GRAPHICAL ABSTRACT

中文翻译：

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热循环氧化铝-蒙乃尔合金钎焊接头的界面和横截面研究

使用 Ticusil（68.8Ag-26.7Cu-4.5Ti，wt%）填充合金，在 5×10-6 Torr 的真空条件下，在 910°C 的真空炉中通过活性金属钎焊技术成功连接氧化铝和蒙乃尔合金. 蒙乃尔-填料合金和氧化铝-填料合金界面的相分析通过X-射线衍射分析进行。通过扫描电子显微镜和能量色散 X 射线分析进行界面和横截面显微结构研究和元素组成的测定。在 50°C 和 600°C 之间进行 100 次循环热循环试验后，接头界面未发现裂纹。显微硬度是在热循环试验后通过维氏硬度计在接头横截面处估计的。热循环接头的典型钎焊强度高于 23 MPa。氦泄漏测试表明热循环钎焊接头具有良好的密封性。图形概要