Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 19, Pages 28032-28036Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.06.136
Keywords
Mullite fiber; Phenolic; Sol-gel; Thermal conductivity; Ambient pressure impregnation
Categories
Funding
- National Natural Science Foundation of China [21978097, U1710252]
- Fundamental Research Funds for the Central Universities [222201817001, 50321041918013, 50321042017001]
- Doctoral Foundation of Tangshan Normal University [2018A08]
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A novel lightweight mullite fiber/phenolic ablator with low density, relatively high bending strength, and low thermal conductivity was prepared, showing excellent thermal insulation and ablation resistance in high temperature environments.
A novel lightweight mullite fiber/phenolic ablator is readily fabricated using mullite fiber felt as the substrate and phenolic aerogel as the matrix via ambient pressure impregnation, sol-gel reaction and ambient pressure drying. The phenolic aerogel with a large amount of macropore can be well-embedded into the voids of flexible mullite fiber felt and form a superior interfacial interaction. The as-prepared mullite fiber/phenolic ablator has a low density of 0.30-0.33 g/cm3 and a relatively high bending strength of 3.4-13.6 MPa. Compared to conventional ablative materials, the mullite fiber/phenolic ablator shows a much lower thermal conductivity of 0.036-0.039 W/(m.K) at room temperature. Moreover, the obtained ablator with linear ablation rate as low as 0.031 mm/s, exhibits excellent ablation resistance and thermal insulation in oxyacetylene flame simulated high temperature of 2000 degrees C.
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