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Properties of Al2O3/TiO2 and ZrO2/CaO flame sprayed coatings

Czupryński A.

Spajanie Materiałów Konstrukcyjnych

2017

Nr 2 (36)

32--39

The article presents the results of the study on exploitation properties of flame sprayed ceramic coatings produced by oxide ceramic material in the form of powder based on the aluminum oxide Al2O3 matrix with addition of 3% titanium oxide TiO2 and also on the zirconium oxide (ZrO2) matrix with 30% calcium oxide (CaO) on the substrate of unalloyed structural steel of S235JR grade. The buffer layer was produced by metallic powder on the base of Ni-Al-Mo. Plates with dimensions of 5x200x300 mm and also front surfaces of ø40x50 mm cylinders have been flame sprayed. The buffer coatings were produced using RotoTec 80 torch and external specific coatings were produced by CastoDyn DS 8000 torch. Investigations of coating properties were based on metallography tests, phase composition research, measurement of microhardness, coating adhesion to the substrate research, abrasive wear resistance (acc. to ASTM G65 standard) and erosion wear resistance (acc. to ASTM G76-95 standard) and thermal stroke study. The coatings were characterized by high adhesion to the substrate and also high erosion and abrasive wear resistance and the resistance for cyclic thermal stroke.