ISSN:
1662-8985
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
To combine the merits of both metals and ceramics into one material, many researchershave been studying the deposition of alumina coating using plasma spray on metal substrates.However, as the coatings are deposited at a high temperature, residual thermal stresses develop due tothe mismatch of thermal expansion coefficients of the coating and substrate and these are responsiblefor the initiation and expansion of cracks, which induce the possible failure of the entire material. Inthis paper, the residual thermal-structural analysis of a Fe3Al/Al2O3 gradient coating on carbon steelsubstrate is performed using finite element modelling to simulate the plasma spray. The residualthermal stress fields are obtained and analyzed on the basis of temperature fields in gradient coatingsduring fabrication. The distribution of residual thermal stresses including radial, axial and shearstresses shows stress concentration at the interface between the coatings and substrate. The mismatchbetween steel substrate and composite coating is still the dominant factor for the residual stresses
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.71.pdf
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