Abstract. A comparative analysis of thermoelastic characteristics of ceramic matrix composite materials (CMC) obtained by liquid- and gas-phase technologies, reinforced with two types of carbon fibers (CF), is carried out based on different model structural-phase composition of the obtained matrix material. It is noted that when implementing the liquid-phase siliconizing and using high-modulus carbon fibers with high negative values of the absolute value of the coefficients of linear thermal expansion (CLTE), a simplified model of the matrix material consisting of only one SiC phase can be correctly used. When implementing PIP and CVI technologies, CMC with low-modulus CF and CF with low negative CLTE values show the greatest sensitivity to an increase in matrix porosity. For CMC based on CF T800, the change in the longitudinal CLTE was about 66% with a porosity of 20%. An increase in porosity leads to a decrease in all elastic characteristics of the CMC, to the greatest extent for the transverse modulus of elasticity and the shear modulus.

Keywords: ceramic matrix composite materials, carbon fibers, SiC matrix, LSI technology, PIP technology, CVI technology, thermoelastic characteristics

For citation: Mikhailyuk N. V., Oborin A. I., Nilov A. S. Comparative analysis of thermoelastic characteristics of ceramic matrix composite materials determined by various model representations of structural-phase composition of the matrix material. Aerospace Engineering and Technology. 2024. Vol. 2, no. 3, pp. 57–68. DOI 10.52467/2949-401X-2024-2-3-57-68. EDN KUSYYI (In Russian)