In situ enhancement of toughness of SiC-TiB2 composites

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

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A process based on liquid phase sintering and subsequent annealing for grain growth is presented to obtain the in situ enhancement of toughness of SiC-30 wt%, 50 wt%, and 70 wt% TiB2 composites. Its microstructures consist of uniformly distributed elongated α-SiC grains, relatively equiaxed TiB2 grains, and yttrium aluminium garnet (YAG) as a grain boundary phase. The composites were fabricated from β-SiC and TiB2 powders with the liquid forming additives of Al2O3 and Y2O3 by hot-pressing at 1850°C and subsequent annealing at 1950°C. The annealing led to the in situ growth of elongated α-SiC grains, due to the β → α phase transformation of SiC, and the coarsening of TiB2 grains. The fracture toughness of the SiC-50 wt% TiB2 composites after 6 h annealing was 7.3 MPa m1/2, approximately 60% higher than that of as-hot-pressed composites (4.5 MPa m1/2). Bridging and crack deflection by the elongated α-SiC grains and coarse TiB2 grains appear to account for the increased toughness of the composites.

Original languageEnglish
Pages (from-to)211-214
Number of pages4
JournalJournal of Materials Science
Volume33
Issue number1
DOIs
Publication statusPublished - 1998 Jan 1

Fingerprint

Toughness
Annealing
Composite materials
Liquid phase sintering
Garnets
Coarsening
Hot pressing
Yttrium
Grain growth
Powders
Fracture toughness
Grain boundaries
Phase transitions
Cracks
Aluminum
Microstructure
Liquids

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Cho, Kyeong Sik ; Choi, Heon Jin ; Lee, June Gunn ; Kim, Young Wook. / In situ enhancement of toughness of SiC-TiB2 composites. In: Journal of Materials Science. 1998 ; Vol. 33, No. 1. pp. 211-214.
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abstract = "A process based on liquid phase sintering and subsequent annealing for grain growth is presented to obtain the in situ enhancement of toughness of SiC-30 wt{\%}, 50 wt{\%}, and 70 wt{\%} TiB2 composites. Its microstructures consist of uniformly distributed elongated α-SiC grains, relatively equiaxed TiB2 grains, and yttrium aluminium garnet (YAG) as a grain boundary phase. The composites were fabricated from β-SiC and TiB2 powders with the liquid forming additives of Al2O3 and Y2O3 by hot-pressing at 1850°C and subsequent annealing at 1950°C. The annealing led to the in situ growth of elongated α-SiC grains, due to the β → α phase transformation of SiC, and the coarsening of TiB2 grains. The fracture toughness of the SiC-50 wt{\%} TiB2 composites after 6 h annealing was 7.3 MPa m1/2, approximately 60{\%} higher than that of as-hot-pressed composites (4.5 MPa m1/2). Bridging and crack deflection by the elongated α-SiC grains and coarse TiB2 grains appear to account for the increased toughness of the composites.",
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In situ enhancement of toughness of SiC-TiB2 composites. / Cho, Kyeong Sik; Choi, Heon Jin; Lee, June Gunn; Kim, Young Wook.

In: Journal of Materials Science, Vol. 33, No. 1, 01.01.1998, p. 211-214.

Research output: Contribution to journalArticle

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