Mechanochemical synthesis and pressureless sintering of TiB 2-AlN composites

Hyung Jong Kim, Heon Jin Choi, June Gunn Lee

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

TiB 2-AlN composites have been fabricated by the pressureless sintering of a mechanochemically processed Ti, Al, and BN powder mixture. TiB 2-AlN powder was obtained from the mixture of Ti, Al, and BN, which had a composition corresponding to 45.7 wt% TiB 2-54.3 wt% AlN, after mechanochemical processing for longer than 24 h. X-ray diffraction and transmission electron microscopy analysis showed that the powder subjected to mechanochemical processing for 60 h consisted of crystallites less than 300 nm in size with a disordered crystal structure. TiB 2-AlN composites with 95% relative density, a flexural strength of 172 MPa, a fracture toughness of 4.6 MPa·m 1/2, a hardness of 12.0 GPa, and an electrical resistivity of 1488 μΩ·cm were obtained by pressureless sintering at 1700°C for 2 h of the powder subjected to mechanochemical processing for 60 h.

Original languageEnglish
Pages (from-to)1022-1024
Number of pages3
JournalJournal of the American Ceramic Society
Volume85
Issue number4
Publication statusPublished - 2002 Apr 1

Fingerprint

Powders
Sintering
Composite materials
Processing
Crystallites
Bending strength
Fracture toughness
Crystal structure
Hardness
Transmission electron microscopy
X ray diffraction
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "TiB 2-AlN composites have been fabricated by the pressureless sintering of a mechanochemically processed Ti, Al, and BN powder mixture. TiB 2-AlN powder was obtained from the mixture of Ti, Al, and BN, which had a composition corresponding to 45.7 wt{\%} TiB 2-54.3 wt{\%} AlN, after mechanochemical processing for longer than 24 h. X-ray diffraction and transmission electron microscopy analysis showed that the powder subjected to mechanochemical processing for 60 h consisted of crystallites less than 300 nm in size with a disordered crystal structure. TiB 2-AlN composites with 95{\%} relative density, a flexural strength of 172 MPa, a fracture toughness of 4.6 MPa·m 1/2, a hardness of 12.0 GPa, and an electrical resistivity of 1488 μΩ·cm were obtained by pressureless sintering at 1700°C for 2 h of the powder subjected to mechanochemical processing for 60 h.",
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Mechanochemical synthesis and pressureless sintering of TiB 2-AlN composites. / Kim, Hyung Jong; Choi, Heon Jin; Lee, June Gunn.

In: Journal of the American Ceramic Society, Vol. 85, No. 4, 01.04.2002, p. 1022-1024.

Research output: Contribution to journalArticle

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AB - TiB 2-AlN composites have been fabricated by the pressureless sintering of a mechanochemically processed Ti, Al, and BN powder mixture. TiB 2-AlN powder was obtained from the mixture of Ti, Al, and BN, which had a composition corresponding to 45.7 wt% TiB 2-54.3 wt% AlN, after mechanochemical processing for longer than 24 h. X-ray diffraction and transmission electron microscopy analysis showed that the powder subjected to mechanochemical processing for 60 h consisted of crystallites less than 300 nm in size with a disordered crystal structure. TiB 2-AlN composites with 95% relative density, a flexural strength of 172 MPa, a fracture toughness of 4.6 MPa·m 1/2, a hardness of 12.0 GPa, and an electrical resistivity of 1488 μΩ·cm were obtained by pressureless sintering at 1700°C for 2 h of the powder subjected to mechanochemical processing for 60 h.

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