Effect of Nanosized Al₂O₃ as Additive on the Sintering Characteristics and Vickers Hardness of Al₂O₃/Si₃N₄ Compound Ceramics

Abstract:

In order to enhance the density and decrease the sintering temperature，Al2O3/Si3N4 compound ceramics were sintered by pressureless using β- Si3N4 as raw materials and Al2O3 as sintering additives. The effects of Al2O3 as additive on the Vickers hardness and the sintering characteristic of Al2O3/Si3N4 compound ceramics were studied. The results shows that adding 9-15% nano- Al2O3 can get Al2O3/Si3N4 compound ceramics only in 1650°C by pressureless sintering because of nano- Al2O3’sintered. As a consequence, the relative density increases from 89% with micro alumina to above 97% with nano- Al2O3, the Vickers hardness increases from 1043.5MPa to 1356.0 MPa.

• Periodical: Advanced Materials Research (Volume 214)
• Pages: 178-181
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.214.178
• Online since: February 2011
• Authors: Hui Fang Wang, Shi Ming Hao, Yu Bao Bi, Ren Hong Yu
• Keywords: Al₂O₃/Si₃N₄ Compound Ceramics, Nanosized Al₂O₃, Sintering Characteristics, Vickers Hardness

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