TY - JOUR
T1 - Characterization of ultrafine SiC-Si3N4 composite powder after heat-treatment in Ar + N2
AU - Li, Xingguo
AU - Chiba, Akihiko
AU - Nakata, Yoshinori
AU - Nagai, Hideaki
AU - Suzuki, Masaaki
PY - 1996/11/30
Y1 - 1996/11/30
N2 - Ultrafine SiC-Si3N4 composite powder synthesized by laser-induced gas-phase reaction was heat-treated at a temperature range of 295-1773 K in a mixture gas flow of Ar + N2. The changes in crystalline structure, shape, particle size, crystalline size, chemical composition, specific surface area and defect state were investigated by X-ray diffraction (XRD), transition electron microscope, chemical analysis, specific surface area analysis and electron spin resonance. No significant changes in the structure are observed after the heat treatment below 1673 K in Ar + N2, similar to the result of the heat-treatment in Ar. At or above 1673 K, the characteristic changes occur, but these depend on the heating atmosphere. The precipitation of metallic silicon, which is observed in the heat-treatment in Ar, is suppressed by introducing only 5% N2 to the atmosphere. The composite powder with a desired composition of SiC and Si3N4 can be obtained by adjustment of the nitrogen partial pressure.
AB - Ultrafine SiC-Si3N4 composite powder synthesized by laser-induced gas-phase reaction was heat-treated at a temperature range of 295-1773 K in a mixture gas flow of Ar + N2. The changes in crystalline structure, shape, particle size, crystalline size, chemical composition, specific surface area and defect state were investigated by X-ray diffraction (XRD), transition electron microscope, chemical analysis, specific surface area analysis and electron spin resonance. No significant changes in the structure are observed after the heat treatment below 1673 K in Ar + N2, similar to the result of the heat-treatment in Ar. At or above 1673 K, the characteristic changes occur, but these depend on the heating atmosphere. The precipitation of metallic silicon, which is observed in the heat-treatment in Ar, is suppressed by introducing only 5% N2 to the atmosphere. The composite powder with a desired composition of SiC and Si3N4 can be obtained by adjustment of the nitrogen partial pressure.
KW - Crystalline structure
KW - Heat treatment
KW - X-ray diffraction
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U2 - 10.1016/S0921-5093(96)10417-2
DO - 10.1016/S0921-5093(96)10417-2
M3 - Article
AN - SCOPUS:0030284148
SN - 0921-5093
VL - 219
SP - 95
EP - 101
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -