Indentation fracture toughness of sintered silicon carbide in the Palmqvist crack regime

Journal Article · Thu Jun 01 00:00:00 EDT 1989 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb06242.x· OSTI ID:6113430

Li, Z ^[1]; Ghosh, A ^[2]; Kobayashi, A S ^[3]; Bradt, R C ^[4]

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1. Argonne National Lab., IL (United States)
2. Oak Ridge National Lab., High Temperature Materials Lab., Oak Ridge, TN (US)
3. Washington Univ., Seattle, WA (United States). Coll. of Engineering
4. Nevada Univ., Reno, NV (United States). Mackay School of Mines

This paper reports on the fracture toughness of a sintered dense {alpha}-SIC estimated by the Vickers indentation microfracture method in the low-load Palmqvist crack regime. It was observed that the use of simultaneously Vickers hardnesses does not yield reliable fracture toughness values, nor does application of the median-crack -derived equation. It is necessary to utilize a load-independent, crack-free hardness value with this toughness estimation method.

• OSTI ID: 6113430
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 72:6; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
FRACTURE PROPERTIES
VICKERS HARDNESS
SINTERING
CARBIDES
CARBON COMPOUNDS
FABRICATION
MECHANICAL PROPERTIES
SILICON COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties