Vacuum-plasma-sprayed silicon coatings

D. J. Varacalle; H. Herman; G. A. Bancke; T. D. Burchell; G. R. Romanoski

doi:10.1016/0257-8972(91)90026-S

Vacuum-plasma-sprayed silicon coatings

D. J. Varacalle, H. Herman, G. A. Bancke, T. D. Burchell, G. R. Romanoski

Metals and Composites Processing

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Vacuum plasma spraying produces well-bonded dense stress-free coatings for a variety of materials on a wide range of substrates. The process is used in many industries for the excellent wear, corrosion resistance and high temperature behavior of the fabricated coatings. In this study, silicon metal was deposited on graphite to study the feasibility of preventing corrosion and oxidation of graphite components for nuclear reactors. Operating parameters were varied in a Taguchi design of experiments to display the range of the plasma processing conditions and their effect on the measured coating characteristics. The coating attributes evaluated were thickness, porosity, microhardness and phase content. This paper discusses the influence of the processing parameters on as-sprayed coating qualities. The paper also discusses the effect of thermal cycling on silicon samples in an inert helium atmosphere. The diffraction spectrum for a sample that experienced a 1600 °C temperature cycle indicated that more than 99% of the coating transformed to β-SiC. The silicon coatings protected the graphite substrates from oxidation in one experiment.

Original language	English
Pages (from-to)	24-30
Number of pages	7
Journal	Surface and Coatings Technology
Volume	49
Issue number	1-3
DOIs	https://doi.org/10.1016/0257-8972(91)90026-S
State	Published - Dec 10 1991

Funding

The technical input of M. Hankins, V. L. Smith-Wackerle, D. V. Miley and A. Erickson is gratefully acknowledged. The work described in this paper was supported by the U.S. Department of Energy under contract DE-ACO7-76ID0l 570.

Funders	Funder number
U.S. Department of Energy	DE-ACO7-76ID0l 570

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10.1016/0257-8972(91)90026-S

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abstract = "Vacuum plasma spraying produces well-bonded dense stress-free coatings for a variety of materials on a wide range of substrates. The process is used in many industries for the excellent wear, corrosion resistance and high temperature behavior of the fabricated coatings. In this study, silicon metal was deposited on graphite to study the feasibility of preventing corrosion and oxidation of graphite components for nuclear reactors. Operating parameters were varied in a Taguchi design of experiments to display the range of the plasma processing conditions and their effect on the measured coating characteristics. The coating attributes evaluated were thickness, porosity, microhardness and phase content. This paper discusses the influence of the processing parameters on as-sprayed coating qualities. The paper also discusses the effect of thermal cycling on silicon samples in an inert helium atmosphere. The diffraction spectrum for a sample that experienced a 1600 °C temperature cycle indicated that more than 99% of the coating transformed to β-SiC. The silicon coatings protected the graphite substrates from oxidation in one experiment.",

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Vacuum-plasma-sprayed silicon coatings

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