关键词: 高温高膛压火炮, 身管寿命, 新型内膛表面性能提升技术, 镀铬, 对比试验

Abstract: Aiming at the problem of incomplete theoretical research and engineering verification of the technology for improving the surface performance of the inner chamber of the gun barrel under high chamber pressure load, through comparative tests on the barrel samples under the traditional single-layer chromium plating technology and the new double-layer composite chromium plating technology, various performance indicators of the inner chamber coating of the barrel were obtained. On this basis, the failure and protection mechanisms of the coating were revealed through various material property characterization methods such as surface contour testing. Meanwhile, the ablation resistance of different coatings under high chamber pressure and internal ballistic environment was experimentally verified by combining gunpowder ablation and scouring tests and shooting tests. Thus, a new type of coating with excellent overall performance, long service life and applicable to high-temperature and high-chamber pressure body tubes was determined. The research results show that the new double-layer composite chromium plating layer can effectively prevent the crack propagation inside the barrel, has better ablation resistance and wear resistance, and can effectively increase the service life of a certain high-temperature and high-chamber pressure artillery barrel by nearly double. The research on the technology of extending the service life of the body tube under high-temperature and high-pressure working conditions is of great significance.

Key words: high temperature and high pressure gun, barrel life, new bore surface performance improvement technology, chromium plating, comparative test