Authors: Heimann, Robert B.; Pentinghaus, Horst J.; Wirth, Richard

Source: European Journal of Mineralogy, Volume 19, Number 2, March-April 2007 , pp. 281-291(11)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

Abstract:

2:1-mullite coatings of (17-23) ± 6 μm thickness were deposited by atmospheric plasma spraying (APS) onto flat aluminium coupons. Scanning transmission electron microscopy (STEM) showed that the coatings immediately adjacent to the substrate interface consisted predominately of an aluminium silicate glass with varying Al/Si ratios. Residual compressive coating stresses with in-plane levels ranging from 100 to 300 MPa were determined by Cr³⁺ photoluminescence piezospectroscopy. The aluminium silicate glass was characterised by wide-angle x-ray scattering (WAXS) using synchrotron radiation to determine the composition (62-63 mole% Al₂O₃) as well as the amount of glass in the coatings (32 ± 2%).

Keywords: MULLITE; PLASMA-SPRAYED COATINGS; RESIDUAL STRESS; ALUMINIUM SILICATE GLASS; PHOTOLUMINESCENCE PIEZOSPECTROSCOPY; WIDE-ANGLE X-RAY SCATTERING

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0935-1221/2007/0019-1716

Publication date: 2007-03-01

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