Plasma-sprayed 2:1-mullite coatings deposited on aluminium substrates

Author: Heimann Robert B.   Pentinghaus Horst J.   Wirth Richard  

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

ISSN: 0935-1221

Source: European Journal of Mineralogy, Vol.19, Iss.2, 2007-03, pp. : 281-291

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

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%).