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Study on New-Typed High-Temperature Endurable Multilayer Insulation

Author: LiJianFang
Tutor: HeXiaoDong
School: Harbin Institute of Technology
Course: Materials Science
Keywords: High temperature SiO2 airgel Multilayer insulation structure Thermal conductivity
CLC: V430
Type: Master's thesis
Year: 2007
Downloads: 672
Quote: 5
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Abstract


Spacecraft re-entry , will be subjected to severe aerodynamic forces and heat , so consider meet aerodynamic conditions , in order to avoid the body reentry aerodynamic heating burned to ensure the normal working of the internal devices in the appropriate temperature range anti / insulation must spacecraft design. Advanced thermal protection system (TPS) is one of the key technologies that determine the success or failure of the spacecraft , which is efficient, light-weight , high-temperature insulation structure is an essential part of the thermal protection system . Developed on the basis of the analysis of the heat transfer mechanism of the multi - layered insulation structure , an aluminum silicate fiber paper and quartz fiber web as the insulation material of the base body , the high temperature binder for the spacer layer , adding a hydrophobic silica airgel plastic insulation filler bonding process prepared the new high-temperature multi-layer insulation structure . Its novelty is that known as \The first basic insulation component materials were characterized by scanning electron microscope ( SEM ) , differential thermal - thermal ( DTA -TG ) , X - ray diffraction (XRD) and infrared absorption spectroscopy (FT-IR) and other modern analytical technical observation and characterization of aluminum silicate fiber paper , the quartz fiber network and hydrophobic SiO2 airgel explore the basic performance of the selected material insulation properties, heat stability . By repeated tests, it is determined the filling process of the insulation filler material in a high-temperature plastic . By changing the addition amount of the heat - insulating filler , and studied the relationship between the added amount of the insulation performance with the new multilayer insulation structure filler . Using a scanning electron microscope (SEM) characterization add the insulation packing adhesives morphology , investigate the effect of the the filler dispersion effect of insulation , adhesive bonding and its insulation properties . The quartz lamp array photoelectric heating means and PBD-02P tablet , thermal conductivity measured by the novel high temperature insulation properties of the multi - layered insulation structure . This article prepared a new type of high-temperature multi-layer insulation structure long-term use temperature of up to 800 to 1000 ℃ , the density is lower than 250kg/m3 , hot surface temperature of 200 ℃, the thermal conductivity is 0.037W / ( m · K ) , hot The surface temperature of 1000 ℃ thermal conductivity preferably 0.080W / ( m · K) . Excellent overall performance can be widely applied in the field of aerospace insulation .

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Propulsion system ( engine, propeller ) > Engine theory and computing
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