Zhou C.-J.,Shandong University |
Zhang H.,Shandong University |
Zhou K.-Y.,Shandong University |
Zhang C.,Shandong University |
And 5 more authors.
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2015
Polymethylphenylsiloxane (PMPS) elastomer ablative composite filled with polysilazane, fumed silica and carbon fibers was prepared and tested using an oxyacetylene torch. After the ablation, the material structure, composition and thermal-oxidative properties of the composite were analyzed using the SEM, FT-IR, XRD and EDS. The results show that a silica layer, a ceramic layer, a pyrolysis layer and the matrix are formed in turn by decomposition, ceramization and oxidation reactions of the virgin ablative composite. Aromatic carbon is formed in the porous pyrolysis and ceramic layers by the degradation of the silicone rubber matrix, which transforms into inorganic carbon in the zone close to the ceramic layer. Silicon carbide crystallite is produced in the ceramic layer. Oxidation of the compounds in the ceramic layer yields a silica layer, which is primarily composed of silica. The thermo-oxidative stabilities of the ablative layers are better than that of the virgin material as a result of the formation of dense carbon layer structure. ©, 2015, Journal of Solid Rocket Technology. All right reserved.