Effect of Si3N4 Starting Powders on Formation of Elongated Ca-α-Sialon Grains

Journal of Inorganic Materials

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Effect of Si₃N₄ Starting Powders on Formation of Elongated Ca-α-Sialon Grains

LI Ya-We¹; WANG Pei-Ling¹; YAN Dong-Sheng¹; CHENG Yi-Bing²

1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai institute ofCeramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. Department of Materials Engineering; Monash University, Clayton, Victoria, 3168, Australia

Received:1999-01-11 Revised:1999-03-15 Published:2000-02-20 Online:2000-02-20

Abstract

Abstract: Two kinds of Si₃N₄ starting powders with different α/β ratios were used to prepare
Ca-α-Sialon with the composition Ca_1.8Si_6.6Al_5.4O_1.8N_14.2 by pressureless sintering. The densification process, reaction
sequence and microstructure of the corresponding materials were studied by XRD analysis and SEM observation. Elongated α-Sialon grains were observed in the materials sintered
with either Si₃N₄ starting powders. On the other hand, Si₃N₄ starting powders with high β phase content resulted in poorer densification
during sintering and the temperature for complete dissolution of β-Si₃N₄ was 100℃ higher than that for α-Si₃N₄. The higher the content of β phase in the starting powders, the fewer nucleation sites there were, and the coarser α-Sialon grains were.
A broad size distribution of the Si₃N₄ starting powders led to the inhomogeneity of α-Sialon grain sizes.

Key words: Ca, α-Sialon, phase formation, microstructure

CLC Number:

TQ163

LI Ya-We,WANG Pei-Ling,YAN Dong-Sheng,CHENG Yi-Bing. Effect of Si₃N₄ Starting Powders on Formation of Elongated Ca-α-Sialon Grains[J]. Journal of Inorganic Materials.

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Effect of Si₃N₄ Starting Powders on Formation of Elongated Ca-α-Sialon Grains

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