Interfacial strength and chemistry of additive-free silicon nitride ceramics brazed with aluminium |
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Authors: | X S Ning K Suganuma T Okamoto A Koreeda Y Miyamoto |
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Affiliation: | (1) The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, 567 Ibaraki, Osaka, Japan;(2) Present address: National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, 239 Kanagawa, Japan |
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Abstract: | Two kinds of additive-free silicon nitride ceramics were brazed with aluminium; one was with as-ground faying surfaces and
the other was with faying surfaces heat-treated at 1073K for 1.8 ksec in air. The heat-treatment of the silicon nitride ceramics
formed a silicon oxynitride layer on the faying surfaces and increased the brazing strength of the joints. A silica-alumina
non-crystalline layer and a β′-sialon layer were formed successively from the aluminium side at the interface of the joints.
The heat-treatment which made the former layer thicker is a necessary process in making reliable, strong brazed joints. |
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