| SHI Long,WEI Dongbo,GU Jiahui,CHEN Xiaohu,XU Yongdong,ZHANG Pingze.Preparation and Properties of Plasma Diffusion Ta-W Alloy Layer on the Inner Wall of Gun Barrel[J],54(5):106-115 |
| Preparation and Properties of Plasma Diffusion Ta-W Alloy Layer on the Inner Wall of Gun Barrel |
| Received:May 17, 2024 Revised:October 14, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.05.008 |
| KeyWord:gun barrel plasma diffusion Ta-W alloy layer microstructure high temperature wear oxyacetylene ablation |
| Author | Institution |
| SHI Long |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| WEI Dongbo |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| GU Jiahui |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| CHEN Xiaohu |
Ningbo Branch of Chinese Academy of Ordance, Zhejiang Ningbo , China |
| XU Yongdong |
Ningbo Branch of Chinese Academy of Ordance, Zhejiang Ningbo , China |
| ZHANG Pingze |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| 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. |
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