Thermal insulation and anti-vibration properties of MoSi2-based coating on mullite fiber insulation tiles

To obtain new high-temperature resistant composites that can meet the requirements of aircraft development for thermal insulation and mechanical properties, SiBCO aerogel composites were prepared by sol-gel, supercritical drying and high-temperature pyrolysis with trimethyl borate (TMB) or phenylboronic acid (PBA) as the boron source and mullite fiber as reinforcement. The structure and composition of the SiBCO aerogel and its composites were characterized with SEM, FT-IR, ICP and nitrogen adsorption tests. The specific surface area of the SiBCO aerogel is 293.22 m2/g, and the pore size is concentrated in the range of 10–150 nm. The mechanical properties, the thermal insulation properties and the temperature resistance were also studied. Due to the introduction of boron, the temperature resistance of SiBCO aerogel composites is improved greatly, and the service temperature of composites reached 1773 K. When n (TMB)/n (TEOS) = 1/1, the temperature resistance of the composites is the best. After heating in air at 1773 K for 30 min, the shrinkage of SiBCO aerogel composites is only 2.45%, and the thermal conductivity of the composites is 0.138 W/(m·K) at 1773 K. In addition, the type and amount of catalyst also have certain effects on the mechanical properties and temperature resistance of the composites.

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Performance Comparison of Aerospace High-Temperature Resistant Ceramic Fiber Felt

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1036.168 ◽

2021 ◽

Vol 1036 ◽

pp. 168-174

Author(s):

Jian Ye Guo ◽

Li Jun Su ◽

Chao Jun Wu ◽

Wen Jing Li ◽

Jie Ying Yang ◽

...

Keyword(s):

High Temperature ◽

Thermal Insulation ◽

Silica Fiber ◽

Ceramic Fiber ◽

Quartz Fiber ◽

Temperature Resistance ◽

Mullite Fiber ◽

High Silica ◽

Better Than ◽

Resistant Ceramic

Be aimed at the development and application of aerospace high-temperature resistant ceramic fiber felt, in this paper, as the common ceramic fiber felt in the field of high temperature resistance, quartz fiber felt, high silica fiber felt and mullite fiber felt were compared. The microstructure, thermal insulation, temperature resistance and mechanical properties were analyzed respectively, the performance advantages and disadvantages of three kinds of ceramic fiber felt were given, and its internal causes were studied. The results show that, the temperature resistance of mullite fiber felt is better than that of quartz fiber felt and high silica fiber felt, mainly due to its polycrystalline mullite structure, the thermal insulation performance of mullite fiber felt and high silica fiber felt is better than quartz fiber felt at high temperature, mainly due to the thermal reflection of polycrystalline mullite and the small pore structure of high silica fiber felt, the compressibility of quartz fiber felt is better than high silica fiber felt and mullite fiber felt.

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Multiscale mullite fiber/whisker reinforced silica aerogel nanocomposites with enhanced compressive strength and thermal insulation performance

Ceramics International ◽

10.1016/j.ceramint.2020.08.013 ◽

2020 ◽

Vol 46 (18) ◽

pp. 28561-28568

Author(s):

Xiang Zhang ◽

Tao Zhang ◽

Zhehan Yi ◽

Liwen Yan ◽

Shan Liu ◽

...

Keyword(s):

Compressive Strength ◽

Thermal Insulation ◽

Silica Aerogel ◽

Mullite Fiber ◽

Insulation Performance

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The Effect of Fiber on EPDM Inhibitor Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1035.118 ◽

2014 ◽

Vol 1035 ◽

pp. 118-121 ◽

Cited By ~ 1

Author(s):

Guo Hui Chen ◽

Jun Tian ◽

Chen Liu ◽

Dong Li ◽

Xiang Hui Lu

Keyword(s):

Thermal Insulation ◽

Ablation Rate ◽

Aramid Fiber ◽

Insulation Material ◽

Insulation Layer ◽

Ablation Resistance ◽

Mullite Fiber ◽

Result Show ◽

High Silica ◽

Different Content

In this paper, we studied the different content of aramid fiber, aramid pulp, carbon fiber, high silica fiber, mullite fiber, alumina fiber's effect on EPDM inhibitor material. The result show that aramid fiber can significantly improve the ablation resistance of thermal insulation layer, when the content of aramid fiber up to 6.7%,the inhibitor material's ablating rate get the minimum value 0.04mm/s. Aramid pulp can improve ablation resistance of thermal insulation layer, but its dispersion in insulation material is difficult. Others inorganic fiber can't lower the ablating rate as much as aramid fiber, it mainly because of the brittleness of inorganic fiber, during the dispersion process, most of fiber had been triturated, so those fiber can't decrease the liner ablation rate of the inhibitor.

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