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High‐Temperature Mechanical Properties of a Uniaxially Reinforced Zircon‐Silicon Carbide Composite
Author(s) -
Singh Raj N.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb07604.x
Subject(s) - materials science , zircon , composite material , silicon carbide , brittleness , composite number , ceramic , transgranular fracture , ceramic matrix composite , intergranular corrosion , boron carbide , intergranular fracture , microstructure , geology , paleontology
Mechanical properties of a monolithic zircon ceramic and zircon‐matrix composites uniaxially reinforced with either uncoated or BN‐coated silicon carbide monofilaments were measured in flexure between 25° and 1477°C. Monolithic zircon ceramics were weak and exhibited a brittle failure up to about 1300°C. An increasing amount of the plastic deformation was observed before failure above about 1300°C. In contrast, composites reinforced with either uncoated or BN‐coated SiC filaments were stronger and tougher than the monolithic zircon at all test temperatures between 25° and 1477°C. The ultimate strength and work‐of‐fracture of composite samples decreased with increasing temperature. A transgranular matrix fracture was shown by the monolithic and composite samples tested up to about 1200°C, whereas an increasing amount of the intergranular matrix fracture was displayed above 1200°C.