Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Bipolar High-power Impulse Magnetron Sputtering of Ta-W Alloy Film on the Inner Surface of 2,800 mm Stainless-Steel Tube

  • Kyoungho Jeon (National Security & Disaster Safety Technology Group, Korea Institute of Science and Technology (KIST)) ;
  • Gyuwon Han (National Security & Disaster Safety Technology Group, Korea Institute of Science and Technology (KIST)) ;
  • Seoung Hyeon Eum (National Security & Disaster Safety Technology Group, Korea Institute of Science and Technology (KIST)) ;
  • Sang Ho Lim (Department of Materials Science and Engineering, Korea University) ;
  • Seunghee Han (National Security & Disaster Safety Technology Group, Korea Institute of Science and Technology (KIST))
  • Received : 2024.08.23
  • Accepted : 2024.10.05
  • Published : 2024.10.31
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Abstract

Chrome plating is a method used to protect the inside of a gun barrel from the severe environment (3,000 K and 4,000 MPa for 20 ms) created by the propellant gas when a cannon is fired. However, Cr-plated films have physical limitations, and the formation of hexavalent Cr compounds has a harmful effect on the environment. Ta-W alloy film has been explored as an alternative to Cr plating owing to the high melting point and corrosion resistance of Ta. However, obtaining pure α-phase Ta by sputtering is difficult, and the autofrettage effect in gun barrels limits the use of annealing. Therefore, a deposition method without the use of additional heat treatment is required to prepare Ta-W films with alpha-phase Ta. We explored the feasibility of depositing Ta-W alloy film inside a 2,800 mm-long stainless-steel tube using bipolar high-power impulse magnetron sputtering. A specially designed cylindrical magnetron sputtering equipment and a four-stage experimental process was employed to deposit a coating with uniform thickness (10.59%) throughout the tube, high adhesive strength (51.51 MPa), and pure alpha-phase Ta. The findings of this study are useful for deposition of Ta-W alloy films inside large-caliber canons.

Keywords

Acknowledgement

This research was supported by the "Tantalum alloy plasma coating technology (Code No.2G11181)" programs of the Korea Institute of Science and Technology, Republic of Korea.

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