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Analytical electron microscopy study of plasma sprayed layers solidified on the metallic substrate.

Czeppe T., Pawłowski A., Baliga W., Górski L.

Archives of Materials Science

2005

Vol. 26, nr 1-2

103-109

The mixture of the ?-Al2O3 and 40 wt.% of TiO2 (rutile) powders, 10-80 žm grade, was plasma sprayed on the Ni-20Cr-5Fe-2Al substrate, after generation of the Ni-25Cr-5Al-1Ti interlayer on the surface. The material was annealed at 1500 K for 10 hours. The microstructure and composition of the phases was analyzed on the cross-sections with the use of TEM (Philips CM 20) with EDX systems. A multilayer structure composed of alternative Al oxide and Ti solid solutions sub-layers was revealed. The sub-layers were composed of columnar crystals of different titanium solid solution composition, or of ?-Al2O3 phase. In direct contact with the substrate the sub-layer composed of Al2TiO5 and Al2Ni3 phases was found. Three compositions of Ti solid solutions were found: Tix(Al2O3)y, Ti(O) and Ti(Al,O).