Mechanical Properties of Silicon Nitrides with Tailored Microstructure by Seeding

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  • 種結晶添加により微構造制御された窒化ケイ素焼結体の機械特性
  • タネ ケッショウ テンカ ニ ヨリ ビ コウゾウ セイギョサレタ チッカ ケイソ

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Abstract

The effect of seeding on microstructure development and mechanical properties of silicon nitride was investigated by the use of two kinds of morphologically regulated β-Si3N4 single crystal particles. Silicon nitrides with bimodal grain-size distribution were obtained by seeding. The seeding of an appropriate amount of β-Si3N4 particles with an appropriate size allowed the development of optimal microstructures, where large elongated grains grown from the seed particles were highly dispersed. As a result, fracture toughness increased retaining the high strength levels of about 1GPa. On the other hand, specimens with large amount of seed particles presented lower strength owing to the coalescence of large elongated grains. The increase in fracture toughness can be associated with diameter as well as volume fraction of well dispersed large β-Si3N4 grains, assuming toughening by the bridging mechanism.

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