Research on the Mechanical and Ablation Properties of Scratchable Stress Release Materials
LI Yang1,2,*, CHEN Yanbin1, HU Junjie1, WU Qianqiu1, HUANG Hailong1
1 Hubei Institute of Aerospace Chemotechnology, Xiangyang 441003, Hubei, China 2 National Key Laboratory of Aerospace Chemical Power, Xiangyang 441003, Hubei, China
Abstract: To enhance the efficiency of stress release layer formation, a novel scratchable composite is devised to develop the stress-release material. Herein, the effects of carbon fiber powder, polyimide fiber, and aramid pulp on the mechanical and ablation properties of CTBN-based composites are studied. It is found that the addition of carbon fiber powder can increase the tensile strength of the composites from 3.97 MPa to 4.54 MPa, and the ablation resistance of the composites is also improved to a certain extent. In addition, the addition of polyimide fiber can reduce the line ablation rate of the composites from 0.292 mm/s to 0.151 mm/s, but the mechanical properties are also significantly reduced. Moreover, the addition of aramid pulp can greatly improve the ablation performance while retaining the most mechanical properties of the composites. Furthermore, with 0.9 phr aramid pulp added, the CTBN-based composites maintain the tensile strength of 3.96 MPa, the elongation at break of 144%, the ablation rate of 0.165 mm/s, and the tear strength from EPDM-based composites of 1.80 MPa, and can be formed through scrape coating, which is a potential candidate for the scratchable stress release materials.
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2025, Vol. 39 
