Improvement of the adhesion of a ceramic coating on a ceramic substrate |
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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) Graduate student of Kyushu Institute of Technology (currently: Kyoritu Alloy Co. Ltd.), Kyushu, Japan |
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| Abstract: | The structure and adhesion of an alumina coating on a ceramic substrate with NiCrAlY alloy bond coating was investigated by
heating at 1573 and 1673 K in the air. Phases of NiO, NiCrO3, NiAl2O4, αAl2O3, and Ni were revealed in a 100 μm thick bond coating on heating at 1573 and 1673 K. A veined structure was also detected
in the coating heated at 1573 K. The adhesion strength of the coating was improved and reached approximately 20 MPa on heating
at 1573 and 1673 K for 14.4 ks in air although the strength of the as-sprayed coating was only 2 MPa. The improvement of adhesion
strength may arise from the formation of NiAl2O4 with a spinel structure at the interfaces of the top coating/bond coating/substrate coating system. The adhesion strength
of the coating improved on decreasing the bond coating thickness and reached approximately 45 MPa for a 20 μm thick bond coating
which was heated at 1673 K. Only NiAl2O4 oxide was formed in the bond coating. |
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| Keywords: | adhesion strength alumina coating bond coat post treating spinel |
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