A new SiC-whisker-reinforced lithium aluminosilicate composite

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb04016.x· OSTI ID:5606304

Xue, L A; Chen, Iwei ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

The glass-ceramic matrix of the well-known lithium aluminosilicate (LAS)/SiC composite is usually formulated near the spodumene composition. The authors report a new composition which is rich in alumina and lean in silica and lithia. This formulation offers a new option of converting the glass-ceramic matrix to a mullite/alumina matrix upon annealing above 1,400 C, and hence better creep resistance and other high-temperature mechanical properties. Using a transient-phase processing method that they developed previously for the superplastic forming of mullite, the authors are able to hot-press a composite containing 30 vol% SiC whiskers at [approximately]1,350 C to achieve full density. Flexural strength measurements up to 1,400 C have confirmed the improved high-temperature strength and creep resistance over conventional LAS. The fracture toughness is also higher than that of LAS. The results suggest that the new composition may be chosen as a better candidate matrix for SiC-fiber-reinforced composites.

• OSTI ID: 5606304
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ANNEALING
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTALS
FABRICATION
FIBERS
HEAT TREATMENTS
LITHIUM COMPOUNDS
LITHIUM SILICATES
MATERIALS
MECHANICAL PROPERTIES
MONOCRYSTALS
OXYGEN COMPOUNDS
SILICATES
SILICON CARBIDES
SILICON COMPOUNDS
WHISKERS