Research On The Mechanism Of Improving Cannon Gun Barrel Life By Electrical Explosion Spraying Technology

Electrical explosion directional spraying as a new kind of thermal sprayingtechnology has a unique advantage compared with the traditional hot sprayingtechnology. It is very significant to study the mechanism of using the technology toimprove anti-erosion in artillery barrel life. In this paper, appropriate improvementis made in the existing electric explosion spraying equipment. Pneumatic clampingway is used to improve the efficiency of spraying. The environmental protectivedust removal system is made in order to reduce the harm of toxic smoke. Wireelectrical explosion spraying principle and the present research status is also studiedin this paper.65Mn,0Cr18Ni9Ti,2Cr13coating is prepared by improved electricexplosion spraying equipment. Coating microstructure was observed with opticalmicroscope and scanning electron microscopy (SEM). The microstructure andhardness are analyzed. It is show that the coating organization is refined than theoriginal microstructure, and coating/substrate interface combined well. There isobvious element diffusion phenomenon, and micro hardness of coating issignificantly enhanced than the original hardness.Take0Cr18Ni9Ti coating for example, technological parameters of sprayingprocess are analyzed, the thickness and porosity in different spraying conditions arecompared by kinds of methods. It is showed that: with the increase of sprayingvoltage, coating porosity decreases and coating thickness increases, but the increaseamplitude decrease; Coating thickness decreases and coating porosity increases,with the increase of the spraying distance; Coating thickness increases and coatingporosity decreases with the increase of spraying times.Take FeCrBSi coating for example, using numerical analysis method toanalysis stress changes in the process of spray particle impacting the steel plate anddeposition process of spray particle. The influence of coating thickness, internalstress of substrate and coating temperature on the coating, substrate temperature andcooling rate are discussed by means of the finite element method. Calculations showthat shock wave of electrical explosion spraying process produced in differentspraying distance and times, the internal stress of steel plate substrate changes little,almost without any damage to substrate. When coating thickness is unchanged, thehigher coating initial temperature the greater influence is happened on substrate temperature of similar depth inner, temperature alteration ratio. In different depthsof substrate, the higher coating initial temperature the greater influence ontemperature and temperature alteration ratio of different depth inner substrate, thegreatest influence occur at near junction surface of substrate and coating. In case ofcoating with same initial temperature the thinner coating thickness, the greaterinfluence on temperature and temperature alteration ratio of different depth inner ofsubstrate. In different depths of substrate, the thinner coating thickness the greaterinfluence on temperature and temperature alteration ratio of different depth anddirection inner of substrate, the greatest influence occur at near junction surface ofsubstrate and coating.Some performance contrast test are made between coating prepared byelectrical explosion spraying technology and chromium coating of existingartillery barrel tube surface re-ablation after analysis on the characteristics ofartillery barrel tube surface modification coatings.Coating prepared by electrical explosion directional spraying is significantlybetter than chrome coating in anti-erosion when it is used in artillery chamber. Themechanism research results of improve artillery barrel life by electrical explosionspraying technology are got.