In situ-toughened silicon carbide-titanium carbide composites

Kyeong Sik Cho, Young Wook Kim, Heon Jin Choi, June Gunn Lee

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A process based on liquid-phase sintering and subsequent annealing for grain growth is presented to obtain in situ-toughened SiC-30 wt% TiC composites. Its microstructures consist of uniformly distributed elongated α-SiC grains, matrixlike TiC grains, and yttrium aluminum garnet (YAG) as a grain boundary phase. The composites were fabricated from β-SiC and TiC powders with the liquid forming additives of Al2O3 and Y2O3 by hot pressing. During the subsequent heat treatment, the β → α phase tansformation of SiC led to the in situ growth of elongated α-SiC grains. The fracture toughness of the SiC-30 wt% TiC composites after 6-h annealing was 6.9 MPa·m1/2, approximately 60% higher than that of as-hot-pressed composites (4.4 MPa·m1/2). Bridging and crack deflection by the elongated α-SiC grains appear to account for the increased toughness of this new class of composites.

Original languageEnglish
Pages (from-to)1711-1713
Number of pages3
JournalJournal of the American Ceramic Society
Volume79
Issue number6
DOIs
Publication statusPublished - 1996 Jan 1

Fingerprint

Titanium carbide
Silicon carbide
titanium
silicon
Composite materials
annealing
Annealing
Liquid phase sintering
yttrium
liquid
fracture toughness
Garnets
Hot pressing
Yttrium
grain boundary
Grain growth
deflection
Powders
Toughness
Fracture toughness

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

Cho, Kyeong Sik ; Kim, Young Wook ; Choi, Heon Jin ; Lee, June Gunn. / In situ-toughened silicon carbide-titanium carbide composites. In: Journal of the American Ceramic Society. 1996 ; Vol. 79, No. 6. pp. 1711-1713.
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abstract = "A process based on liquid-phase sintering and subsequent annealing for grain growth is presented to obtain in situ-toughened SiC-30 wt{\%} TiC composites. Its microstructures consist of uniformly distributed elongated α-SiC grains, matrixlike TiC grains, and yttrium aluminum garnet (YAG) as a grain boundary phase. The composites were fabricated from β-SiC and TiC powders with the liquid forming additives of Al2O3 and Y2O3 by hot pressing. During the subsequent heat treatment, the β → α phase tansformation of SiC led to the in situ growth of elongated α-SiC grains. The fracture toughness of the SiC-30 wt{\%} TiC composites after 6-h annealing was 6.9 MPa·m1/2, approximately 60{\%} higher than that of as-hot-pressed composites (4.4 MPa·m1/2). Bridging and crack deflection by the elongated α-SiC grains appear to account for the increased toughness of this new class of composites.",
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In situ-toughened silicon carbide-titanium carbide composites. / Cho, Kyeong Sik; Kim, Young Wook; Choi, Heon Jin; Lee, June Gunn.

In: Journal of the American Ceramic Society, Vol. 79, No. 6, 01.01.1996, p. 1711-1713.

Research output: Contribution to journalArticle

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