Abstract: Carbon fiber-reinforced resin matrix composites (CFRP) are lightweight, high-strength and can be applied to space vehicle tanks to significantly reduce the structural weight and geometric volume of the propulsion system. However, the leakage of CFRP tanks has seriously affected the tank application. This article first introduced the metal-lined CFRP tank, and then reviewed the research progress of anti-leakage of the non-metal-lined CFRP cryogenic tank, including the leakage mechanism, anti-leakage design, leakage detection methods, etc. The anti-leakage design methods for nanomaterial doping enhancement, resin matrix modification and toughening, and layered structure optimization design at home and abroad were summarized, and the research direction of non-metal-lined CFRP cryogenic tank anti-leakage research was prospected.

Key words: composites, cryogenic tank, leakage mechanism, anti-leakage, leakage examination