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33. Effect of Silicon Carbide Whiskers on the Physicomechanical Properties of ZrB2/SiC Ceramic Composite Materials.

Author

Voronov, V. A., Lebedeva, Yu. E., Chainikova, A. S., Tkalenko, D. M., and Shavnev, A. A.

Subjects
CRYSTAL whiskers, CERAMIC materials, SILICON carbide, BENDING strength, THERMOPHYSICAL properties, COMPOSITE materials, MICROHARDNESS
Abstract

ZrB2/(20 – х)SiC/хSiCw (х = 0.5–1.5 vol %) ceramic composite materials have been produced by spark plasma sintering, and their physicomechanical and thermophysical properties have been shown to be influenced by the percentage of the silicon carbide whiskers. The best properties are offered by the ZrB2/SiC ceramic composite material containing 0.5 vol % silicon carbide whiskers. The addition of silicon carbide whiskers has been shown to ensure an increase in apparent density to 99.7% and a reduction in open porosity to 0.13%. Moreover, it increases the microhardness of the composites to 16.4 GPa, their critical stress intensity factor to 5.7 MPa m1/2, and their bending strength to 580 MPa. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Investigation of the Interaction of Y2O3–Al2O3–SiO2 Coatings with Water Vapor and Na2SO4 at Temperatures to 1450°C.

Author

Lebedeva, Yu. E., Chainikova, A. S., Shchegoleva, N. E., and Solntsev, S. S.

Subjects
*WATER vapor, *SURFACE coatings, *CHEMICAL resistance, *WEIGHT gain, *SILICON carbide
Abstract

Coatings based on the system Y2O3–Al2O3–SiO2 are promising for protecting silicon carbide based materials from the effects of an oxidizing atmosphere, water vapor, and salt vapors. The interaction of Y2O3–Al2O3–SiO2 coatings, obtained by the sol-gel method, with water vapor and Na2SO4 salt was investigated. Coatings based on the yttrium aluminosilicate system were found to have good oxidative and chemical resistance to water vapor and Na2SO4 salt at temperatures 1300 – 1450°C. The weight gain for the coated samples tested in Na2SO4 salt vapor did not exceed 1%. The initial SiC substrates are characterized by active oxidation processes with weight reduction from 8 to 11%. [ABSTRACT FROM AUTHOR]

Published
2021
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