Abstract
Reactive materials such as titanium and tantalum are not suitable for the manufacture of pure and corrosion-resistant layers by atmospheric spraying processes, and thus are normally processed by vacuum plasma spraying. However, because of the large specific area of the feedstock, large amounts of previously adsorbed oxygen and nitrogen are included in the coating, often resulting in unsatisfactory corrosion behavior. This can be avoided by vacuum arc spraying using a single wire. The spraying material is a cathodic poled wire that is led without contact through a nonconsumable, water-cooled nozzle. The wire is melted by a high-frequency arc that burns between the wire and the nozzle. The process gas (argon) at-omizes the wire and accelerates the particles onto the component being coated. The process parameters strongly influence the stability of the process and the resulting microstructure of the deposit.
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References
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Steffens, H.D., Nassensteln, K. Recent developments in single-wire vacuum arc spraying. JTST 3, 412–417 (1994). https://doi.org/10.1007/BF02658987
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DOI: https://doi.org/10.1007/BF02658987