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http://dx.doi.org/10.4191/KCERS.2003.40.8.751

Liquid Phase Sintered SiC-30 wt% TiC Composites by Spark Plasma Sintering  

조경식 (금오공과대학교 재료공학전공)
이광순 (금오공과대학교 재료공학전공)
송진호 (금오공과대학교 재료공학전공)
김진영 (쌍용머티리얼주식회사)
송규호 (쌍용머티리얼주식회사)
Publication Information
Abstract
Rapid densification of a SiC-30 wt% TiC powder with additive 10 wt% A1$_2$O$_3$-Y$_2$O$_3$-CaO was conducted by Spark Plasma Sintering(SPS). The fully-densified materials can be obtain through the SPS process with very fast heating rate and short holding time. In the present work, the heating rate and applied pressure were kept to be $100^{\circ}C$/min and 40 MPa, while sintering temperature varied from $1600^{\circ}C$ to $1800^{\circ}C$ for 10 min. The full densification of SiC-30 wt% TiC composites with the addition of $Al_2$O$_3$, $Y_2$O$_3$ and CaO was achieved at the temperature above $1700^{\circ}C$ by spark plasma sintering. The XRD found that 3C-SiC and TiC were maintained the entire SPS process temperature, without phase transformation of SiC and formation of YAG phase to $1800^{\circ}C$. The microstructures of the rapidly densified SiC-30 wt% TiC composites consisted of smaller equiaxed SiC grains and larger TiC grains. The biaxial strength of 635.2 MPa and fracture toughness of 6.12 MPaㆍ$m^{1/2}$ were found for the specimen prepared at $1750^{\circ}C$.
Keywords
SiC-TiC composites; Spark plasma sinteting; Rapid densification;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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