Preparation and Thermal Fatigue Behaviors of Silicon Nitride Nano-Ceramics

Abstract:

Silicon nitride nanoceramics were prepared by hot press sintering amorphous Si₃N₄ and α-Si₃N₄ nanopowders. The microstructures as well as the effect of starting powders size on the mechanical properties and thermal fatigue properties were investigated. The results show that microstructure of sintered materials consists of spherical grains with approximate size of 100 nm. The mechanical properties and thermal fatigue resistance vary with the addition of α–Si₃N₄ powders. The maximum flexural strength and fracture toughness are obtained when the α–Si₃N₄ powders amount is 40wt.%. And the Si₃N₄ nanoceramic added 40wt.% α–Si₃N₄ powders has the best capability to suppress crack propagation and the highest critical temperature difference.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 48-52
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.48
• Online since: March 2015
• Authors: Chun Yan Tian*, Hai Jiang
• Keywords: Mechanical Properties, Nanoceramic, Silicon Nitride, Thermal Fatigue Resistance

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