Comparison between Pulse Electric Current Sintering and Hot Pressing of Silicon Nitride Ceramics.

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  • 窒化ケイ素セラミックスのパルス通電焼結とホットプレス焼結の比較

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Abstract

Samples of a Si3N4 mixed powder with oxide sintering additives, Y2O3 5mass% and Al2O3 3mass%, were sintered separately by pulse electric current sintering (PECS) and by hot pressing to discuss the characteristic features of these two processing techniques. The low-temperature consolidation and the plasma effect, which have been reported to be features of the PECS process, could not be confirmed in this study. In the sintering of Si3N4 ceramics as a material for electrical insulators, the rapid consolidation, which enables the nanometer-scale grain size to be maintained in the dense material, was shown to be the only advantage of the PECS process.

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