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Microstructure, wear and mechanical properties of plasma sprayed TiO2 coating on Al–SiC metal matrix composite

Dinesh Babu P., Prasannakumar B., Marimuthu P., Mishra R. K., Ram Prabhu T.

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 3

756--767

In the present study, the hard TiO2 coating was plasma sprayed on the Al/SiC composite substrate. The coating was characterised for microstructure, mechanical and tribological properties and compared with the substrate. The key findings from the present study are: (1) The lamellae structure of the coating contains semi and fully melted particles, round porosity without any evidence of spallation or delamination or un-melted particles and non-stoichiometric and oxygen deficient phases and shorter stand-off distance would be a probable reason for the occurrence of partial melted regions and porosity in the coating, (2) The coating has improved significantly scratch resistance, hardness, fracture roughness, friction coefficient and wear resistance of the substrate, and (3) mild abrasive wear is responsible for low wear loss in the coated sample whereas the combination of severe delamination wear and abrasive wear causes the considerable wear loss in the uncoated sample.

Research into morphology and properties of TiO2 – NiAl atmospheric plasma sprayed coating

Maruszczyk A., Dudek A., Szala M.

Advances in Science and Technology. Research Journal

2017

Vol. 11, no 3

204--210

Titania (TiO2) based coatings are ceramic products with unique properties that make them widely applicable (e.g. in automotive industry, optoelectronics, chemical processing or medicine). Atmospheric plasma spray process enables to deposit TiO2 with addition of NiAl feedstock material which has an influence on coating cohesion and adhesion to substrate. However, the literature and technical notes give little information about parameters of spraying of TiO2-10 wt.% NiAl feedstock powders enables producing coating without nonuniformities including cracks and delamination form substrate. The aim of the work was to verify the parameters of plasma spraying by evaluation of the morphology and properties of manufactured the TiO2-10 wt.% NiAl coatings. Titania based coatings were deposited by means of atmospheric plasma sprayed on steel substrate using TiO2-10 wt.% NiAl feedstock powders. Morphology and microstructure were examined using light optical microscope (LOM) and scanning electron microscope (SEM). Coating chemical composition were analysed by means of SEM-EDS method. Coating surface topography and Knoop microhardness were determined. Porosity and thickness were evaluated by using quantities image analysis programme. Plasma spraying parameters used in our research allow to obtain uniform coating without cracks and delamination at coating-substrate interface. It acknowledges that uniformity of coating technological properties as well manufactured coatings can be put to wear tests, such as high temperature oxidation, corrosion, erosion or cavitation erosion resistance evaluation.

Wpływ przygotowania powierzchni na elektronową emisję polową powłok TiO2 natryskanych plazmowo z zawiesin

Znamirowski Z., Kozerski S., Łatka L., Pawłowski L.

Przegląd Spawalnictwa

2016

R. 88, nr 3

27--31

W pracy badano elektronową emisję polową z powłok TiO2 na podłożach ze stali austenitycznej. Powłoki natryskiwano plazmowo z użyciem zawiesin. Zawiesiny sporządzano na bazie mieszaniny alkoholu etylowego 50% i wody 50%. Powierzchnie próbek toczono lub poddawano obróbce strumieniowo-ściernej. Stwierdzono, że emitery polowe natryskane na powierzchnie poddane wcześniej obróbce strumieniowo-ściernej charakteryzują się lepszą stabilnością emisji elektronowej.

The electron field emission of TiO2 coatings on substrates made of austenitic steel has been investigated. Plasma sprayed coatings using suspensions. The suspensions were prepared based on a mixture of 50% ethyl alcohol and 50% water. The surfaces of the samples machined or subjected to abrasive blasting. It has been found that the field emitters been sprayed onto the surface before blasting, they have better stability of electron emission.