2026-10-14T14:07:41Z https://www.scidb.cn/oai

10.57760/sciencedb.j00125.00162 2026-05-14T10:00:34Z

2026-05-14 Discontinuous Ablation Behavior of Four-Directional Dual-Matrix C/C Composites under Dual-Pulse Solid Rocket Motors doi:10.57760/sciencedb.j00125.00162 en Four-directional dual-matrix C/C composites were fabricated using a combined approach of soft-hard hybrid weaving preform molding, chemical vapor infiltration, high pressure impregnation and carbonization. The ablation resistance of the composites was evaluated through ablation testing in a dual-pulse solid rocket motor, and their discontinuous ablation behavior was investigated. The results showed that the carbon rods in the composites exhibited a hexagonal shape, with a dense pyrolytic carbon "wall" structure formed around them. The unilateral linear ablation rates of the composites after pulse I and pulse II were 0.068 mm/s and 0.113 mm/s, respectively. The cellular-like PyC layer and nanowire structures deposited during the ablation process were attached to the surface of the throat convergent section, while cracks and delamination occurred on and within the divergent section. The ablation of C/C composites under dual-pulse rocket motor conditions involved a complex process, including high-temperature, high-speed gas scouring, oxygen-containing thermochemical ablation, and thermal shock. This work elucidates the ablation behaviors of C/C composites under dual-pulse conditions and provides technical guidance and a theoretical basis for designing and fabricating C/C composites for extreme ablation environments. C/C composites; Ablation; Dual-pulse solid rocket motor; Microstructure evolution; Four-directional dual-matrix Dr. Wang Running Zhang Jiaping Li Kezhi Cui Hong RESTRICTED dataset http://www.doi.org/10.2139/ssrn.5327947 Science Data Bank