Studies on Ablation-resistant Properties of Inorganic Nano-particles Hybrid Phenolic resin
- Paper number
IAC-10.C2.4.9
- Author
Mr. Nai-liang Liu, China
- Coauthor
Mrs. Huang Ying, Northwestern Polytechnical University, China
- Coauthor
Mr. Li Chunhua, Northwestern Polytechnical University, China
- Coauthor
Ms. Yanmei Shi, Shenyang Liming Aero-Engine (Group) Co., Ltd., China
- Year
2010
- Abstract
Ablative thermal protection is a common thermal protection technology for recoverable spacecraft, which makes use of the decomposition, depolymerization, melting, evaporation, gasification or ionization of materials to transfer a large quantity of heat in order to ensure the safety of the internal device. The ablation-resistant properties of hybrid phenolic materials with 5wt\% SiC, SiO\small 2 and Al\small 2O\small 3 inorganic nano-particles were studied in this paper. Glass transition temperature (Tg) of hybrid phenolic materials with SiC, SiO\small 2 and Al\small 2O\small 3 inorganic nano-particles which studied by differential scanning calorimetry (DSC) increased by 6.31℃, 1.35℃ and 4.93℃ separately. This indicated that adding inorganic nano-particles hindered movement of molecular chain. Moreover the Tg values were also raised. Activation energies of thermal decomposition of different kinds of materials were calculated by Kissinger and Flynn-Wall-Ozawa method. It was found that after adding inorganic particles activation energy of thermal decomposition in the first stage decreased slightly, which made post-curing reaction easier. The degree of decreasing was: SiO\small 2$>$Al\small 2O\small 3$>$SiC. While in the third stage activation energy of thermal decomposition increased to improve heat resistance of materials at high temperatures. The degree of increasing was: Al\small 2O\small 3$>$SiC$>$SiO\small 2. The average linear ablation rate of glass fiber reinforced pure phenolic, phenolic with SiC -hybrid, phenolic with SiO\small 2-hybrid and phenolic with Al\small 2O\small 3-hybrid tested by oxygen-acetylene ablation were 0.210 mm/s, 0.178 mm/s, 0.194 mm/s and 0.166 mm/s separately. The morphologies of composite materials observed by scanning electron microscopy (SEM) after ablation showed that glass fiber were melted during ablation, which formed a compact insulating layer at the surface. The carbon layer ablated beside the decomposed aera kept the porous structure caused by ablation, which reduced thermal conduction.
- Abstract document
- Manuscript document
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