SiC-Fiber Reinforced Silicon Carbide-Based Ceramic Composite
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Fiber Reinforced Silicon Carbide-Based Ceramic Composite M. G. Frolovaa, *, Yu. F. Kargina, A. S. Lysenkova, S. N. Perevislovb, D. D. Titova, K. A. Kima, E. I. Istominac, A. V. Alpatova, and K. A. Solntseva aBaikov
Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, 119334 Russia Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199034 Russia c Institute of Chemistry, Komi Scientific Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, 167000 Komi Republic, Russia *e-mail: [email protected]
bGrebenshchikov
Received February 4, 2020; revised March 20, 2020; accepted April 3, 2020
Abstract—Dense silicon carbide-based ceramic composites reinforced with SiCf fiber have been produced by hot pressing at a temperature of 1850°C. The reinforcing agent used was silicon carbide fiber produced by siliciding carbon cloth with SiO vapor. It has been shown that raising fiber content from 1 to 7 wt % increases the density, bending strength, and fracture toughness of the material, which reach ρ = 3.20 ± 0.01 g/cm3, δb = 450 ± 26 MPa, KIс = 5.6 ± 0.1 MPa m1/2 at 7 wt % SiC fiber. Keywords: SiC ceramics, fiber, hot pressing, fracture toughness, mechanical properties DOI: 10.1134/S0020168520090058
INTRODUCTION Silicon carbide-based ceramics are oxidationresistant and withstand prolonged mechanical loading and high temperatures (up to 1800°C). Owing to their attractive properties, silicon carbide-based ceramics are promising for use as parts of internal combustion and gas turbine engines, cutting tools, slide and roller bearings, heating elements, etc. [1–7]. Silicon carbide has a combination of useful mechanical properties, but its main drawback is brittleness. To produce SiC-based ceramics and composite materials, use is made of reaction sintering [8], silicidation of carbon matrices with molten silicon [9] (including complex-shaped parts [10]), liquid-phase sintering [11, 12], and other processes. Dense ceramics with good mechanical properties and performance parameters can be produced by hot pressing [13]. Silicon carbide fiber reinforcement improves the fracture toughness and wear resistance of ceramics and allows the range of traditional applications of composites to be considerably extended [14]. Interest in composites is aroused mainly by the possibility of controlling their mechanical and physical characteristics, which depend primarily on the properties of their constituent components: reinforcing agents and matrix [1]. The role of the matrix is to ensure a monolithic structure of the composite, fix the shape of an article and the mutual arrangement of reinforcing fibers, distribute the acting stress over the bulk of the
material (ensuring a uniform load on the fiber), and redistribute it upon fracture of some fibers [15]. The possibility of using silicon carbide fiber as a reinforcing agent ensures a combination of properties, such as high strength and electrical conductivity, good resistance to corrosion and high-temperature creep, heat resistance,
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