EFFECT OF HEAT TREATMENT ON THE STRUCTURE OFSiC−Si3N4COMPOSITE ULTRAFINE POWDER

X. Li, Y. Nakata, H. Nagai, T. Okutani and M. Suzuki
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X. Li: Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
Y. Nakata: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan
H. Nagai: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan
T. Okutani: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan
M. Suzuki: Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 79-83

Abstract: Effect of heat treatment on the structure ofSiC−Si3N4composite ultrafine powder was studied.SiC-Si3N4composite ultrafine powder synthesized by laser-induced gas-phase reaction was heat-treated at various temperatures below 1773 K in 99%Ar+1% H2gas mixture. The change of the structure was studied by chemical analysis, x-ray diffraction (XRD), and transmission electron microscope (TEM). The structure of the powder did not change significantly in lattice constant, particle size, and composition by the treatment up to1573K. The structure of the powder changed drastically by the treatment above1673K. The broad XRD pattern due toβ-Sifor the original powder changed to the four phases ofβ-SiC,Siand α,β-Si3N4by the treatment at1773K, accompanied by large increases in particle size and lattice parameter, and decreases in nitrogen content and specific surface area.

Date: 1996
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DOI: 10.1142/S0218625X96000188

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