Microwave-assisted brazing of alumina ceramics for electron tube applications

Bulletin of materials science

A K Shukla²  M Sathiya¹  K Ramesha¹  A S Prakash¹  Giridhar Madras² 

[1] CSIR Central Electrochemical Research Institute-Madras Unit, CSIR-Madras Complex, Taramani, Chennai 600 113, India$$CSIR Central Electrochemical Research Institute-Madras Unit, CSIR-Madras Complex, Taramani, Chennai 600 113, IndiaCSIR Central Electrochemical Research Institute-Madras Unit, CSIR-Madras Complex, Taramani, Chennai 600 113, India$$;Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, IndiaSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Joining;    ceramics;    interfaces;    microhardness;    brazing strength;    Helium leak test.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Alumina was joined with alumina using microwave-assisted and conventional brazing methods at 960$^{circ}$C for 15 min using TiCuSil (68.8Ag�??26.7Cu�??4.5Ti in wt.%) as the brazing alloy. The brazed joints were characterizedby X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Vickers microhardness evaluation, brazing strength measurement and helium leak test. X-ray diffraction analysis confirmed the formationof Ti-based compounds at the substrate-filler alloy interfaces of the microwave and conventionally brazed joints. The elemental compositions at the joint cross-section were determined by energy dispersive X-ray analysis. Vickers microhardness measurement indicated reliable joint performance for the microwave-assisted brazed joints during actual application in an electron tube. Brazing strength measurement and helium leak test provided the evidence forgood alumina-alumina joint formation.

【 授权许可】

Unknown