HEAT-PROOF AND HEAT-RESISTING COMPOSITE MATERIAL Russian patent published in 2000 - IPC

FIELD: manufacture of materials used in oxidizing media at high temperatures; manufacture of high-temperature electric heaters; parts, sensors and instruments working at temperatures up to 1900 C and higher. SUBSTANCE: proposed material contains the components in the following ratio, vol.-%: Mo₅Si₃ and W₅Si₃ and/or (Mo,W)₅Si₃ and/or (Mo,W)₅Si₃C and/or Mo₅Si₃C, 15 to 85: MoSi₂, WSi₂ and/or (Mo,W)Si₂, 0.8 to 55; silicon carbide, 2 to 84.2; content of molybdenum and tungsten in total mass of refractory metals in silicide phases of material, mass-%: molybdenum, 7 to 80 and tungsten, 20 to 93. Composite material may additionally include in silicide phases the following components, mass-%: rhenium, 0.5 to 30; tantalum, 0.1 to 18; niobium, 0.1 to 8; titanium, 0.5 to 10; zirconium, 0.05 to 8 and hafnium, 0.1 to 16. Composite material may contain inclusions of graphite and/or carbon fibers in the amount of 5 to 80 vol-% of volume not occupied by silicides of refractory metals. Composite material may consist of several layers with one or several inner layers of graphite and/or layers of pyrolitically thickened carbon fabric or other dense carbon and/or silicon carbide material. Material may have pores in the amount of 15 to 78 vol.-%. Proposed composite material may be used for manufacture of high temperature electric heaters and various parts working at high temperatures. EFFECT: enhanced high-temperature strength, resistance to thermal shocks and heat-resistance. 14 cl, 7 ex