Failure mechanism of sputtered Ta coatings on short rifled gun bore under vented vessel tests
Year: 2025
Type: article
Abstract: Tantalum is a promising candidate for chromium electrodeposition in large gun bore coatings. However, brittle β-Ta phase can be easily obtained by magnetron sputtering at low temperatures. In this study, Ta coatings were deposited on the inner surfaces of short rifled tubes using high-power impulse magnetron sputtering technology. The Ta coatings were confirmed to be pure α-Ta phase. When subjected to vented vessel test (VVT) firings, all α-Ta coatings exhibited excellent adhesion. After 10 VVT firings, the total average mass loss was only 0.07 g, indicating strong anti-ablation property against 320 MPa gunpowder explosions. A chemically affected zone eroded by the gunpowder explosion was formed less than 2.1 μm. Additionally, several bulges form on Ta coating surface. This primary failure mode is attributed to decarbonization behavior during VVT firings, while the external collapse of interfacial carbon leads to the formation of bulges and opening cracks in the coating.
Source: npj Materials Degradation
Institutions: Chinese Academy of Sciences, Institute of Metal Research, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Henan Institute of Science and Technology, Nanjing University of Science and Technology, Shenyang National Laboratory for Materials Science, Northeastern University
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,590
Awards: G2804997205, G2883089354, G3975431528
OpenAlex ID: W4409246510