A kind of organosilicon thermal insulation layer for engine and preparation method thereof

Abstract

The invention discloses a silicone thermal insulation layer for an engine and a preparation method thereof. The raw materials of the silicone thermal insulation layer include: heat vulcanized two-component liquid silicone rubber as a base material, powdery ablation-resistant filler, density-reducing filler, anti-ablation filler, Oxidants, coolants, phosphorus-based flame retardants and fiber fillers; among them, the powdery ablation-resistant fillers are zirconium silicide and holmium trioxide, the density-reducing fillers are phenolic hollow microspheres, the antioxidant is boron carbide, and the coolant is alkali Formula magnesium carbonate, phosphorus flame retardant is FR‑103 flame retardant, fiber filler is phenolic fiber and high silica fiber. The invention can prepare the organosilicon thermal insulation layer for the engine which is resistant to ablation, has good mechanical properties, low heat conduction, low density and low glass transition temperature.

Description

technical field [0001] The invention relates to a thermal insulation layer for engines. The thermal insulation layer is suitable for thermal protection of various engines, especially suitable for thermal protection of afterburning chambers of ramjet engines that work for a long time and have relatively harsh working conditions, and can be widely used in aerospace, aviation, weapons, etc. , Ships and other fields. Background technique [0002] According to the molecular structure, the engine insulation layer materials can be generally divided into three categories, namely silicon-based insulation layer, carbon-based insulation layer and organic polymer-based insulation layer. Carbon-based insulation layer material has excellent ablation resistance and anti-scouring performance, but its high density increases the negative weight of the engine; its thermal conductivity is high, and it cannot achieve the purpose of heat insulation when used alone; it cannot be integrally formed ...

AI Technical Summary

Problems solved by technology

The "High-efficiency Silicone Thermal Insulation Layer Technology Research" carried out by Weapon 204 during the "Eleventh Five-Year Plan" period successfully passed the final assembly acceptance in 2010. The ablation performance of the developed silicon-based thermal insulation layer reached the leading position in China, and it took more than 300 seconds for the first time in my country Solid ramjet flight test assessment; With the development of ramjet technology, higher requirements are put forward for the mechanical properties, density, thermal conductivity, long storage life and glass transition temperature of the formula. The existing formula technology cannot cover many excellent properties, so the improvement The mechanical properties of the heat insulation layer extend the storage life, reduce the density, heat conduction and glass transition temperature (below -55 ℃) to become the research direction of the new generation of engine heat insulation layer formula

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