Preparation, microstructure, and mechanical properties of silicon carbide-dysprosia composites

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Abstract

Composites of silicon carbide (SiC) with up to 30 vol% of dysprosia (Dy 2O 3) were fabricated by hot pressing and hot isostatic pressing. The effects of Dy 2O 3 dispersions on the microstructure and on selected mechanical properties of the composites were investigated. When 10-15 vol% of Dy 2O 3 was dispersed in the SiC matrix, the fracture toughness increased by -40%, whereas the flexural strength was comparable to that of unreinforced SiC. The increased fracture toughness was due to crack, deflection, in conjunction with crack-interface grain bridging, and was not related to a phase transformation of Dy 2O 3 in the matrix.

Original languageEnglish (US)
Pages (from-to)2997-3008
Number of pages12
JournalJournal of the American Ceramic Society
Volume80
Issue number12
StatePublished - Dec 1997

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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