Effects of additive amount on microstructure and fracture toughness of SiC-TiB2 Composites

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

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Powder mixtures of β-SiC-30 wt% TiB2 containing 5 wt% (ST1), 10 wt% (ST2), and 20 wt% (ST3) Al2O3-Y2O3 as sintering additives were liquid-phase sintered at 1850°C for 1 h by hot-pressing and subsequently annealed at 1950°C for 2, 6, and 12 h. These materials had a microstructure of 'in situ-toughened composites' as a result of the β→α phase transformation of SiC during annealing. The introduction of larger amount of additives accelerated the grain growth of elongated α-SiC grains with higher aspect ratio, resulting in the improved fracture toughness. The fracture toughnesses of 12-h annealed materials with 5, 10, and 20 wt% additives were 5.7, 5.9, and 7.1 MPam1/2, respectively.

Original languageEnglish
Pages (from-to)299-305
Number of pages7
JournalCeramics International
Volume24
Issue number4
DOIs
Publication statusPublished - 1998 Jan 1

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Fracture toughness
Microstructure
Composite materials
Hot pressing
Grain growth
Powders
Aspect ratio
Sintering
Phase transitions
Annealing
Liquids

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Cho, Kyeong Sik ; Choi, Heon-Jin ; Lee, June Gunn ; Kim, Young Wook. / Effects of additive amount on microstructure and fracture toughness of SiC-TiB2 Composites. In: Ceramics International. 1998 ; Vol. 24, No. 4. pp. 299-305.
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Effects of additive amount on microstructure and fracture toughness of SiC-TiB2 Composites. / Cho, Kyeong Sik; Choi, Heon-Jin; Lee, June Gunn; Kim, Young Wook.

In: Ceramics International, Vol. 24, No. 4, 01.01.1998, p. 299-305.

Research output: Contribution to journalArticle

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T1 - Effects of additive amount on microstructure and fracture toughness of SiC-TiB2 Composites

AU - Cho, Kyeong Sik

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AB - Powder mixtures of β-SiC-30 wt% TiB2 containing 5 wt% (ST1), 10 wt% (ST2), and 20 wt% (ST3) Al2O3-Y2O3 as sintering additives were liquid-phase sintered at 1850°C for 1 h by hot-pressing and subsequently annealed at 1950°C for 2, 6, and 12 h. These materials had a microstructure of 'in situ-toughened composites' as a result of the β→α phase transformation of SiC during annealing. The introduction of larger amount of additives accelerated the grain growth of elongated α-SiC grains with higher aspect ratio, resulting in the improved fracture toughness. The fracture toughnesses of 12-h annealed materials with 5, 10, and 20 wt% additives were 5.7, 5.9, and 7.1 MPam1/2, respectively.

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