In Situ Analysis of the Liquid Phase Sintering Process of α-SiC Ceramics

doi:10.15541/jim20150461

Abstract

Abstract:

The densification process of liquid phase sintered SiC ceramics with Al₂O₃ and Y₂O₃ as sintering additives was investigated by in situ measurement apparatus combined with conventional methods. The shrinkage curve, morphology of the sample and liquid phase formation process simulation were observed by high temperature in-situ observation furnace. The relative density, flexural strength and microstructure evolution were characterized by analysis of samples sintered at temperatures ranging from 1640℃ to 1920℃ at 40℃ interval. The obvious temperature that liquid phase began to function was confirmed between 1640℃ to 1680℃. The classical liquid phase sintering theory was testified. Highly-densified SiC ceramics were obtained by being sintered at 1880℃, of which the relative density was (99.46 ± 0.37)%, and the flexural strength was (650 ± 26) MPa.

Key words: SiC, liquid phase sintering, in-situ measurement, microstructure

CLC Number:

TQ174

LIANG Han-Qin, YAO Xiu-Min, HUANG Zheng-Ren, ZENG Yu-Ping. In Situ Analysis of the Liquid Phase Sintering Process of α-SiC Ceramics[J]. Journal of Inorganic Materials, 2016, 31(4): 443-448.

Figures/Tables 5

Fig. 2 Evolution of relative density and flexural strength as function of sintering temperatures

Fig. 3 XRD analysis of samples heated at temperature from 1640℃ to 1920℃

Fig. 4 SEM fracture surface micrographs of samples sintered at different temperatures (a) 1640℃; (b) 1680℃; (c) 1720℃; (d) 1760℃; (e) 1800℃; (f) 1840℃; (g) 1880℃; (h) 1920℃

Fig. 5 “Simulation” of the liquid phase composition melting and wetting process on the SiC wafer. Morphologies of six characteristic temperature points (a) 35℃; (b) 1450℃; (c) 1481℃; (d) 1582℃; (e) 1644℃; (f) 1793℃

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