Stress and dislocations in diamond-SiC composites sintered at high pressure, high temperature conditions

Stephen Nauyoks, Monika Wieligor, T. W. Zerda, L. Balogh, T. Ungár, Peter Stephens

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Diamond-silicon carbide composites were sintered at 10 GPa and three different temperatures: 1600, 1800, and 2000 °C. Distributions of residual surface stresses in diamond crystals were obtained by the analysis of Raman band shifts and splitting. It was noted that stresses concentrate around points of contacts between diamond crystals. Average stress increase with increasing sintering temperature. Complementary information on average sizes of crystallites, concentration of stacking faults, and population of dislocations in both diamond and SiC were obtained from X-ray diffraction profile analysis. It was observed that for both diamond and silicon carbide phases the average crystallite sizes decrease. The population of dislocations in the diamond phase increases with increasing sintering temperature and the population fluctuates in the SiC phase. Concentration of stacking faults was significant only in SiC.

Original languageEnglish
Pages (from-to)566-572
Number of pages7
JournalComposites Part A: Applied Science and Manufacturing
Volume40
Issue number5
DOIs
Publication statusPublished - May 2009

Fingerprint

Diamond
Diamonds
Composite materials
Stacking faults
Silicon carbide
Temperature
Sintering
Crystals
Crystallite size
Dislocations (crystals)
Crystallites
X ray diffraction analysis

Keywords

  • A. Ceramic-matrix composites (CMCs)
  • B. Microstructures
  • B. Residual/internal stress
  • E. Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

Cite this

Stress and dislocations in diamond-SiC composites sintered at high pressure, high temperature conditions. / Nauyoks, Stephen; Wieligor, Monika; Zerda, T. W.; Balogh, L.; Ungár, T.; Stephens, Peter.

In: Composites Part A: Applied Science and Manufacturing, Vol. 40, No. 5, 05.2009, p. 566-572.

Research output: Contribution to journalArticle

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AU - Ungár, T.

AU - Stephens, Peter

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