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High temperature fracture of a SiC whisker-reinforced alumina in air and vacuum
Chalmers University of Technology.
Chalmers University of Technology.
Luleå tekniska universitet.
1994 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 13, no 5, p. 427-436Article in journal (Refereed) Published
Abstract [en]

The fracture behaviour of a SiCw/alumina composite was studied between room temperature and 1320°C in vacuum by four-point bend testing of specimens pre-cracked by bridge indentation. The results are compared to those of earlier work on a similar material in air. In vacuum, the composite begins to exhibit stable crack growth (SCG) and increasing apparent toughness at about 1100°C. Between 1100 and 1320°C, the extent of SCG increases and the toughness rises to almost three times the room temperature fracture toughness. The toughness enhancement is due mainly to such processes as crack deflection, crack branching, microcrack zone formation and crack tip blunting rather than any temperature-related increase in intrinsic fracture resistance of the material. In air, the fracture processes are similar to those in vacuum but the toughness increase is delayed by about 100°C and the level of toughening is lower. These differences arise from the formation of a glass phase in air which delays microcrack formation but reduces the resistance to stable crack growth.

Place, publisher, year, edition, pages
1994. Vol. 13, no 5, p. 427-436
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-11191DOI: 10.1016/0955-2219(94)90020-5Local ID: a18ecac0-fd37-11db-b816-000ea68e967bOAI: oai:DiVA.org:ltu-11191DiVA, id: diva2:984140
Note
Godkänd; 1994; 20070508 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21Bibliographically approved

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