Preparation And Performance Of New Ablation Inhibitors For Barrel Weapons

Barrel is an important component of gun and other barrel weapons.With the continuous improvement of the power of gun propellants in modern warfare,barrel ablation is more serious,which has become one of the key factors restricting the performance and life of barrel weapons.Adding ablation inhibitors to propellants is the simplest and most effective method,but traditional ablation inhibitors have problems such as poor fluidity and uneven dispersion,resulting poor ability to fill and repair barrel cracks.In fact,the extension and expansion of cracks formed after ablation of barrel are is the main reason for reducing the life.If the expansion of cracks can be prevented,all ablation can only occur on the surface of the chromium layer,not extend to the inside layer,thereby preventing the detachment of the chromium layer,and ultimately significantly improving the service life of barrel weapons.In response to the above issues,in this paper,the preparation and performance of two new types of ablation inhibitors,including composite high-temperature lubrication self-repairing ablation inhibitor（CCI）and high-sphericity amorphous calcium carbonate ablation inhibitor（ACC）,have been studied.The main research contents and conclusions are as follows:（1）Composite high-temperature lubrication self-repairing corrosion inhibitor（CCI）:A composite high-temperature lubrication self-repairing corrosion inhibitor was designed and prepared by ball milling using Mo S₂,WS₂,talc powder,graphite powder,B-Si,Mg（OH）₂as raw materials.The results of SEM,particle size distribution,EDS,XRD,DSC-TG and ablation inhibition performance tests on CCI show that the particle size distribution of the inhibitor samples are significantly improved after ball milling for 8 hours;after ball milling,components do not react and no new substances are generated;the high-temperature lubricating phase does not decompose at high temperatures,which is conducive to the high temperature lubrication effect.The melting of B-Si is conducive to the glass transition process;when the addition amount of CCI ablation inhibitor is 0.5%,it has a certain ablation inhibition effect;the ablation inhibition mechanism analysis shows that the prepared high-temperature lubrication self-repairing ablation inhibitor has significant repair effects on micro-sized cracks and holes.（2）High-sphericity amorphous calcium carbonate ablation inhibitor（ACC）:Using Ca Cl₂and Mg Cl₂·6H₂O as raw materials,a high-sphericity amorphous calcium carbonate ablation inhibitor was prepared by gas diffusion method.The prepared ACC was tested by SEM,particle size distribution,EDS,sphericity,XRD,OM,stability,and ablation inhibition performance.The results show that the prepared ACC is a spherical amorphous CaCO₃with uniform size and smooth surface,and its particle size is mainly distributed in about 5.4μm along with the sphericity as high as 0.98;In a freeze drying environment or in the presence of organic solvents such as acetone and ethyl acetate,the crystal form and morphology of ACC exhibit excellent stability;In high-temperature environments,although ACC may undergo crystal transformation,its good spherical morphology can still largely ensure its high fluidity;when the addition amount of ACC is 1%,the ablation amount is smaller than that of common Ca CO₃ablation inhibitors,and is very close to the ablation amount of standard gun propellants,indicating a good ablation reduction effect.