Effect of Starting Powders on Microstructure and Properties of Silicon Nitride Nanoceramics

Hai Jiang; Chun Yan Tian

doi:10.4028/www.scientific.net/AMM.217-219.239

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 217-219Effect of Starting Powders on Microstructure and...

Effect of Starting Powders on Microstructure and Properties of Silicon Nitride Nanoceramics

Abstract:

Silicon nitride nanoceramics were fabricated by hot press sintering two kinds of Si₃N₄ nano-sized powders. The effect of starting powders on microstructure, mechanical properties and thermal shock resistance were investigated. The microstructure of sintered materials consists of spherical grains and the addition of α–Si₃N₄ to starting powders does not affect the grain morphology. The flexural strength, fracture toughness and thermal shock resistance increase with the increase in amount of α–Si₃N₄ starting powders, and the maximum mechanical properties are obtained when the amount of α–Si3N4 powders is 40wt.%. The hardness values decrease with the increase of α–Si₃N₄ amount.

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Applied Mechanics and Materials (Volumes 217-219)

Pages:

239-244

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.217-219.239

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Online since:

November 2012

Authors:

Hai Jiang, Chun Yan Tian

Keywords:

Si₃N₄, Mechanical Property, Microstructure, Nanoceramic, Thermal Shock Resistance

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