Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Journal of Achievements in Materials and Manufacturing Engineering

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: high velocity oxy-fuel technique

Sortuj według:

Ogranicz wyniki do:

The wear resistance of thermal spray the tungsten and chromium carbides coatings

Richert M. W.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 47, nr 2

177--184

Purpose: The objective of the work concerns of wear-resistance of different kinds of thermal spray coatings covering industrial fun blades. The coatings were sprayed onto the fun blades by Plasma Spraying and High Velocity Oxygen Fuel Spraying (HVOF) methods. The Cr3C2, WC and also its compositions were sprayed into the fun blades. The coatings were tested in industry conditions and the effect of influence of centrifugation industry emissions on the stage of the wearing after the exploitation was compared for deposited coatings. Design/methodology/approach: The investigations of coating microstructures by optical microscopy (MO) and transmission electron microscopy (TEM) were performed. The examination of fun blades after the exploitation and the analysis of the obtained results was correlated with the performed microstructure observations and microhardness data of coatings. Findings: The microstructures of Cr and W carbides coatings were observed and analyzed. The micro hardness of the sprayed coatings was compared. The coatings were evaluated from the point of view resistance against the wear. Practical implications: The performed investigations provide information, which kind of carbide coatings characterize the most wear resistance in the industrial conditions. Originality/value: It was assumed that HFOV coats have more uniform microstructure, higher microhardness, which could suggests better resistance against the wear and grindability.

The Cr3C2 thermal spray coating on Al-Si substrate

Richert M., Książek M., Leszczyńska-Madej B., Nejman I., Grzelka R., Pałka P.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 38, nr 1

95-102

Purpose: The objective of this work was to present the changes between the plasma sprayed and high velocity oxy-fuel (HVOF) wear Cr3C2 resistant coats. The differences in microstructure and microhardness of coatings were investigated. The characterization of fully melted, un- melted and partly melted areas was performed. Design/methodology/approach: The investigated coats contained very differentiate areas, especially plasma sprayed layers. Systematic investigations of microstructure by using optical, electron scanning microscopy and transmission electron microscopy selected fully melted, un- melted or partly melted areas and their characteristic features were performed. Microhardness of coats was measured and compared with the similar literature results. Findings: Microstructure of plasma sprayed coats was finding as consisting from elongating splats, additionally contained un-melted previous particle of powder and some voids and oxides. Contrary to this the HFOV coatingss were more uniform containing almost equiaxial grains. The microhardness of HFOV coatings was almost two times higher than plasma sprayed ones. Practical implications: The performed investigations provide information, which could be useful in the industrial practice about the essential features of wear resistant plasma sprayed coatings. Originality/value: It was assumed that HVOF coatings have more uniform microstructure, higher microhardness, which could suggests better resistance before the wear and grindability.