Ceramic coating on ceramic with metallic bond coating |
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| Authors: | K Kishitake H Era F Otsubo T Sonoda |
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| Affiliation: | (1) Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology, Kita-Kyushu 804, Japan;(2) Kyushu Institute of Technology, Kyoritu Alloy Co. Ltd., Japan |
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| Abstract: | The change in structure and adhesion strength of the interface by heating in air has been investigated for a plasma- sprayed
alumina coating on a ceramic substrate with a 50Ni- 50Cr alloy bond coating. A veined structure composed of NiO, NiCr
2O4, and NiAl2O4 oxides grew from the bond coating into cracks or pores in the top coating and the alumina substrate after heating at 1273
K for 20 h in air. The NiAl2O4 spinel may have formed by the oxidization of nickel, which subsequently reacted with the alumina coating or the substrate.
The mechanism of the penetration of the spinel oxides into the cracks or pores is not clear. The adhesion strength of the
coating is increased to about 15 MPa after heating at 1273 K for 20 h in air, compared to an as- sprayed coating strength
of only 1.5 MPa. |
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| Keywords: | adhesion strength alumina coating bond coating plasma spraying veined oxide |
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