Mechanical properties and microstructures of sol-gel derived ceramic-matrix composites

1995 ◽  
Vol 30 (11) ◽  
pp. 2769-2784 ◽  
Author(s):  
J. M. Chant ◽  
S. M. Bleay ◽  
B. Harris ◽  
R. Russell-Floyd ◽  
R. G. Cooke ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sol Gel ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites

scholarly journals Thermal-Shock behaviour of Short-Fibre Ceramic-Matrix Composites Made by the Freeze-Gelation Process

1993 ◽  
Vol 2 (2) ◽  
pp. 096369359300200 ◽  
Author(s):  
R S Russell-Floyd ◽  
R Johnson ◽  
R G Cooke ◽  
B Harris
Keyword(s):  
Mechanical Properties ◽  
Thermal Shock ◽  
Sol Gel ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Quenching Temperature ◽  
Sol Gel Process ◽  
Shock Behaviour ◽  
Thermal Shock Behaviour

This paper discusses the effect of thermal shock on the mechanical properties of some ceramic matrix composites manufactured by the sol-gel process. The composites were prepared by the freeze-gelation of aqueous sols of two different matrix compositions, each containing about 10vol% of Saffil alumina fibres. The properties of one composite remained almost unaffected by the thermal shock, while those of the second material remained unaffected up to about 300°C and then fell smoothly as the water-quenching temperature was further increased to 600°C.

Fabrication, microstructure, and mechanical properties of TaC particulate and SiC fiber-reinforced lithia-alumina-silica composites

1995 ◽  
Vol 10 (3) ◽  
pp. 602-608 ◽  
Author(s):  
Hyun-Ho Shin ◽  
Randolph Kirchain ◽  
Robert F. Speyer
Keyword(s):  
Mechanical Properties ◽  
Glass Ceramic ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Particulate Reinforcement ◽  
Sic Fiber ◽  
Reinforced Composite ◽  
Ceramic Route ◽  
Particulate Reinforced

Additions of O to 9 mol % Ta2O5 to a lithia-alumina-silica glass-ceramic matrix Nicalon SiC-reinforced composite increased the elastic modulus and ultimate strength of the composite. The additive fostered sphereulitic growth of β-eucriptite solid solution crystals which concentrated Ta2O5 at sphereulite boundaries and adjacent to the fiber-matrix carbon-rich interphases. These regions reacted with the interphases as well as soluble carbon monoxide gas to convert them to TaC. The former reaction was shown to be thermodynamically favorable above 983 °C, while the latter was favorable above 1249 °C. The improvement in mechanical properties was attributed to TaC particulate reinforcement, and suggests a simple glass-ceramic route to the fabrication of particulate-reinforced ceramic matrix composites.

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