Research Of Gun Barrel Bore Enhancement Based On TiAlN And TiAlYN Thin Films

The barrel is the main part of the gun system,related to the overall efficiency of the weapon.The service life of the barrel by the ablation degree in bore surface,thermal and chemical factors and mechanical factors seriously affect the ablation degree,reduce the three main influencing factors of the barrel is necessary to improve the way of barrel life.According to the ablation factors of the gun barrel,the Ti Al N thin film shield steel matrix was put forward to reduce the damage of the three main factors to the barrel.Using the method of material performance test and numerical simulation are combined,around the high temperature oxidation experiment,the friction and wear experiment,the thermal structure coupling simulation,the friction and wear simulation expansion,in order to have the enlightenment to the barrel protective coating research..1)The thermal static coupling analysis of the barrel and the coating barrel.Research shows:that the temperature gradient distribution along the tube,the main heat affected zone is less than 1mm;the maximum temperature appears on the surface of the contact with the powder gas,the maximum value of the barrel stress appears on the inner surface,the maximum value of the coating barrel stress occurs at the interface between the coating and the gun steel.2)The oxidation properties of Ti_0.70Al_0.30N thin films and Ti_0.50Al_0.50N thin films were compared and analyzed.Research shows:that before oxidation,two kinds of films are combined well with gun steel;after oxidation,Ti_0.70Al_0.30N film formed on the surface of the iron oxide film formed,on the surface of Ti_0.50Al_0.50N were Al₂O₃ and Ti O₂ mixed oxide film;the relative content of Al is the key of Ti Al N thin film and oxidation,the oxidation resistance of Ti_0.50Al_0.50N film is better than that of Ti_0.70Al_0.30N film.3)The oxidation properties of Ti_0.50Al_0.50N thin films and Ti_0.495Al_0.495Y_0.01N thin films were compared and analyzed.Research shows:that before oxidation,combining the two film and gun steel,less white particles on the surface of Ti_0.495Al_0.495Y_0.01N film;after oxidation,the small grain size of Ti_0.495Al_0.495Y_0.01N thin film surface oxide;oxidation resistance of Ti_0.495Al_0.495Y_0.01N films is better than Ti_0.50Al_0.50N films.4)The friction coefficient of Ti_0.50Al_0.50N film and Ti_0.495Al_0.495Y_0.01N film were tested.Research shows:that under the same conditions,the friction coefficient of convergence of Ti_0.495Al_0.495Y_0.01N films is smaller than the Ti_0.50Al_0.50N film,and found that Ti_0.495Al_0.495Y_0.01N film adhesion is better;with Ti_0.50Al_0.50N coating gun steel surface hardness is larger,but less than the hardness of the film itself;using LS-DYNA software to simulate two kinds of thin film friction stress,stress mainly concentrated in the recovery area and tensile area,at the junction of the stretch zone and compression zone,the Von Mises equivalent stress decreases with the extension of the wear scar.