表面技术2025，Vol.54Issue(5)：106-115,10.DOI:10.16490/j.cnki.issn.1001-3660.2025.05.008
火炮身管内壁等离子渗镀Ta-W合金层及性能研究
Preparation and Properties of Plasma Diffusion Ta-W Alloy Layer on the Inner Wall of Gun Barrel
摘要
Abstract
In the process of artillery use,friction and wear often occur in high pressure and high temperature environment.The inner wall needs to withstand the impact of high-speed projectiles and the erosion of high temperature and high pressure gas,resulting in a significant reduction in the firing accuracy and strength of the artillery after multiple launches and severely limiting the service life.After W is added to pure Ta,the alloy exhibits good combination properties,such as high strength,high melting point and good high temperature ductility,which can significantly improve wear resistance and ablation resistance.In addition,according to the Ta-W phase diagram,no brittle intermetallic compounds are formed between Ta and W.The related preparation technologies mainly include magnetron sputtering technology,arc ion plating technology,electro-spark deposition technology,plasma spraying technology,etc. The wear resistance and ablation resistance of the inner wall of gun steel barrel were improved by plasma diffusion Ta-W alloy layer.Ta-W alloy coating was prepared on the inner wall of gun steel barrel by plasma diffusion technology.The wear resistance of the Ta-W alloy layer was analyzed by friction and wear test at 500℃.The erosion resistance of the Ta-W alloy layer was evaluated by oxyacetylene ablation test. The surface of the Ta-W alloy layer was dense and uniform,and the elements of the cross-section alloy layer were gradiently distributed.The metallurgical bonding between the alloy layer and the substrate was realized.The Ta-W alloy layer was composed of a single α-Ta and had a(211)preferred orientation.The wear rates of the substrate under three loads at 500℃for 15 min were 7.49×10-5,4.2×10-5 and 7.7×10-5 mm3/(N·m),respectively,while the wear rates of the Ta-W alloy layer were 1.77×10-5,1.53×10-5 and 3.38×10-5 mm3/(N·m),respectively.The average friction coefficient of the Ta-W alloy layer did not change much under the same load,but the overall fluctuation range of the friction coefficient was obviously reduced.Oxygen-acetylene ablation after 15 seconds,the mass loss and mass ablation rate of the gun steel substrate were 5.78 mg and 0.34 mg/s,respectively,and the mass loss and mass ablation rate of the Ta-W alloy layer were 5.02 mg and 0.28 mg/s,respectively.WO3 and Ta2O5 phases were produced during the ablation process of Ta-W alloy layer.The wear rate of Ta-W alloy layer was only 23.63%,36.00%and 43.84%of that of gun steel substrate,and the wear resistance was significantly improved. The Ta-W alloy layer is characterized by abrasive wear and oxidation wear.The Ta-W alloy layer shows abrasive wear and oxidation wear.The thermal erosion resistance of the Ta-W alloy layer is significantly improved. The thermal erosion resistance of the Ta-W alloy layer is significantly improved,and the ablation failure mechanism of the Ta-W alloy layer is the repeated cycle of the melting-shedding process of WO3 and Ta2O5 caused by high temperature airflow erosion.关键词
火炮身管/等离子渗镀/Ta-W合金层/微观结构/高温磨损/氧乙炔烧蚀Key words
gun barrel/plasma diffusion/Ta-W alloy layer/microstructure/high temperature wear/oxyacetylene ablation分类
金属材料引用本文复制引用
石龙,魏东博,谷佳慧,陈小虎,徐永东,张平则..火炮身管内壁等离子渗镀Ta-W合金层及性能研究[J].表面技术,2025,54(5):106-115,10.基金项目
国家科技重大专项基础研究项目(Y2022-Ⅲ-0004-0013) （Y2022-Ⅲ-0004-0013）
南京航空航天大学"前瞻布局科研专项"重点培育项目(ILB23015) Basic Research Project of National Science and Technology Major Projects(Y2022-Ⅲ-0004-0013) （ILB23015）
Nanjing University of Aeronautics and Astronautics'Forward-Looking Scientific Research Special Project'Key Cultivation Project(ILB23015) （ILB23015）
