レーザ加熱による窒化けい素セラミックスのき裂の修復

概要

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Repairing of minute cracks on a surface of the advanced ceramics is one of the important technology for practical use, since the cracks decrease the flexural strength. This paper describes the repairing method for sintered silicon-nitride based on heating with pulsed YAG laser irradiation. Laser heating for 20 seconds in atmosphere of nitrogen gas increases surface temperature to 1600-1750℃. A controlled surface flaw introduced with Vickers indentation, depth of which is 100 μm, disappeared after the laser heating, and the flexural strength at room and elevated temperatures became the value of a specimen without surface flaw. This method is applicable for repairing cracks on the ground surface with diamond grinding wheels. The repairing with laser irradiation is thought to be caused by resintering with the sintering aids and by boundary consolidation with crystallization siliconnitride-yittrium-oxide.
公益社団法人精密工学会の論文
1993-05-05