An, HG Kim, YW Lee, JG 2024-01-21T13:04:34Z 2024-01-21T13:04:34Z 2021-09-04 2001-01 0955-2219 https://pubs.kist.re.kr/handle/201004/140829 By using alpha- and beta -SiC starting powders, the effects of initial alpha -phase content of SiC on microstructure and mechanical properties of the hot-pressed and subsequently annealed SiC-30 wt.% TiC composites were investigated. The microstructures developed were analyzed by image analysis. Their microstructures consist of uniformly distributed elongated alpha -SiC grains, equiaxed TiC grains and an amorphous grain boundary phase. During annealing, the beta-->alpha phase transformation of SiC leads to the in-situ growth of elongated alpha -SiC grains. The average diameter of SiC increases with increasing alpha -SiC content in the starting powder and the aspect ratio shows a maximum at 1% alpha -SiC and decreases with increasing alpha -SiC content in the starting powder. Such results suggest that microstructure of SiC-TiC composites can be controlled by changing alpha -SiC content in the starting powder. The strength increased with increasing alpha -SiC content when alpha -SiC content is higher than 10% while the fracture toughness decreased with increasing alpha -SiC content, i.e. the same trend with the variation of aspect ratio of SIC in the composites. (C) 2000 Elsevier Science Ltd. All rights reserved. English ELSEVIER SCI LTD TOUGHENED SILICON-CARBIDE FRACTURE-TOUGHNESS BETA->ALPHA TRANSFORMATION CERAMICS Effect of initial alpha-phase content of SiC on microstructure and mechanical properties of SiC-TiC composites Article 10.1016/S0955-2219(00)00160-6 1 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.21, no.1, pp.93 - 98 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 21 1 93 98 scie scopus 000166013600013 2-s2.0-0035172431 Materials Science, Ceramics Materials Science Article TOUGHENED SILICON-CARBIDE FRACTURE-TOUGHNESS BETA->ALPHA TRANSFORMATION CERAMICS composites mechanical properties microstructure SiC-TiC TiC