Plasma Sputtering of a Nanostructured Hafnium-Oxide Coating by Means of a Prandtl–Meyer Flow
- 7 Downloads
The geometric characteristics of the supersonic nozzle of a plasmatron intended for vacuum plasma sputtering, which creates a Prandtl–Meyer expansion fan, are estimated. The nozzle facilitates nanoparticle condensation from the vapor phase of the sputtered material due its cooling in the vicinity of the nozzle cross section rotated by 6° and 27°. During the process of sputtering, a coating containing mainly large-scale particles and their fragments and a film consisting of nanoparticles are formed if the central part of the nozzle and its peripheral regions pass over the sample, respectively. Investigation into the surface structure of a HfO2–9% Y2O3 coating 30 μm thick indicates the existence of deformed particles and nanostructured regions in the form of thin film fragments.
Keywordshafnium oxide plasma spraying Prandtl–Meyer flow supersonic nozzle nanostructured coating
Unable to display preview. Download preview PDF.
- 1.D. Zhu and R. A. Miller, Surf. Coat. Technol. 108–109, 104 (1998). doi 10.1016/S0257-8972(98)00669-0Google Scholar
- 2.D. Zhu, N. P. Bansal, and R. A. Miller, in Proc. 105th Annual Meeting and Exposition of the American Ceramic Society (Nashville, TN, April 27–30, 2003), pp. 1–9.Google Scholar
- 6.J. A. Schetz and A. E. Fuhs, Fundamentals of Fluid Mechanics (John Wiley and Sons, 1999).Google Scholar
- 7.V. S. Avduevskii, E. A. Ashratov, A. V. Ivanov, and U. G. Pirumov, Gas Dynamics of Supersonic An-Isobaric Jets (Mashinostroenie, Moscow, 1989) [in Russian].Google Scholar
- 9.G. N. Abramovich, Applied Gas Dynamics (Nauka, Moscow, 1969) [in Russian].Google Scholar