Effects of Seeding with β-Si3N4 Rod Crystals on Mechanical Properties of Silicon Nitride Ceramics

Abstract

Abstract: In this paper, the effects of seeding β-Si₃N₄ rod crystals prepared by self-propagating high-temperature synthesis on the mechanical
properties of silicon nitride ceramic were investigated. The experimental results showed that with the increase of β-Si₃N₄ rod crystals
content, the fracture toughness increases, while the flexile strength decreases. The fracture toughness can increase from 4.0MPa·m^1/2
to 6.7MPa·m^1/2 when 8wt%β-Si₃N₄ rod crystal was added compared with that without seeding. The improvement of fracture
toughness results from the grain pullout and bridging, branching of elongated grains.

Key words: β-Si₃N₄ rod crystals, silicon nitride, fracture toughness

CLC Number:

TQ174

CHEN Dian-Ying,ZHANG Bao-Lin,ZHUANG Han-Rui,LI Wen-Lan. Effects of Seeding with β-Si₃N₄ Rod Crystals on Mechanical Properties of Silicon Nitride Ceramics[J]. Journal of Inorganic Materials.

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Effects of Seeding with β-Si₃N₄ Rod Crystals on Mechanical Properties of Silicon Nitride Ceramics

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