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S. ISLAK1,* , S. BUYTOZ2, E. ERSOZ2, N. ORHAN2, J. STOKES3, M. SALEEM HASHMI3, I. SOMUNKIRAN2, N. TOSUN2
In this study, Al2O3-TiO2 composite coatings were thermally sprayed on the SAE 1040 steel using atmospheric plasma spray (APS) process of mixed different rates micron–sized TiO2 and micron-sized Al2O3 powders. The effects of TiO2 addition on the microstructure, phase compositions and microhardness of the coatings were investigated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and microhardness tester. The results show that the Al2O3-TiO2 composite coatings consists of both fully melted regions and partially melted regions, and the fully melted region has a lamellar-like structure. Phase transformations from mainly stable α-Al2O3 and anatase-TiO2 in the powders to predominant metastable γ-Al2O3, rutile-TiO2 and Al2TiO5 phase in the Al2O3-TiO2 composite coatings were observed. It was determined that the pore content decreased with the increased in the TiO2 powder rate. The microhardness of the coating layers was 3-4.5 times higher than substrate material. The average microhardness values of the coatings were found to reach 650-860 HV..
Plasma spray, Ceramic coating, γ-Al2O3, Rutile-TiO2.
S. ISLAK, S. BUYTOZ, E. ERSOZ, N. ORHAN, J. STOKES, M. SALEEM HASHMI, I. SOMUNKIRAN, N. TOSUN, Effect on microstructure of TiO 2 rate in Al 2 O 3 TiO 2 composite coating produced using plasma spray method, Optoelectronics and Advanced Materials - Rapid Communications, 6, 9-10, September-October 2012, pp.844-849 (2012).
Submitted at: May 15, 2012
Accepted at: Sept. 20, 2012
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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