scholarly journals Determination of selected properties and fracture toughness of HVOF coatings

2016 ◽  
Vol 60 (5) ◽  
pp. 148-153 ◽  
Author(s):  
M. Landová ◽  
J. Brezinová
Keyword(s):  
Fracture Toughness ◽  
Basic Material ◽  
Thermal Cycles ◽  
Thermally Sprayed Coatings ◽  
Steel Aisi ◽  
Experimental Works ◽  
Thermally Sprayed ◽  
Sprayed Coatings

Abstract The article is aimed at evaluation of chosen properties of thermally sprayed coatings based on tungsten carbide. It was evaluated two types of coatings – WC-FeCrAl and WC-WB-Co. The coatings were deposited on basic material steel AISI 316L. The aim of experimental works was to determine the quality and resistance of coatings in corrosion environment depending on number of thermal cycles. The quality of coatings was evaluated by determination of their adhesion depending on thermal cycles, determination of microhardness and indentation fracture toughness. Coatings were exposed in tribo-corrosion conditions with the presence of 1% NaCl. The results of experimental showed a higher quality of coating WC-WB-Co.

Standardization of Metallographic Practices for Thermally Sprayed Coatings in the Automotive Industry

1998 ◽  
Author(s):  
G.A. Blann
Keyword(s):  
Microstructural Analysis ◽  
Substrate Material ◽  
Polished Surface ◽  
Reaction Products ◽  
Thermally Sprayed Coatings ◽  
Polishing Procedures ◽  
Thermally Sprayed ◽  
Substrate Temperatures ◽  
Sprayed Coatings

Abstract Thermally-sprayed coatings are applied 10 various materials 10 provide protection for beat-loaded parts as well as corrosion and wear. They also serve as a thermal barrier 10 reduce metal substrate temperatures. Microstructural analysis is used to characterize the substrate, the coating, and the adherence of the coating 10 the substrate. Accurate evaluation or these coatings depends heavily upon the quality of the polished surface produced by metallographic preparation. A well-prepared surface must first be free c1 plucked material and have minimal relief between the hard and soft constituents. The entire surface must be flat to allow a clear view of the interface and any reaction products that might be present in the coating or the substrate. Furthermore, the finished polished specimen must be scratch-free and have no resolution destroying films or stains. Various metal and oxide coatings on ferrous substrate material are used 10 demonstrate the excellent microstructural detail that is revealed when correct polishing procedures are used. These special techniques successfully address the problems normally encountered when preparing hard, brittle coatings or softer metallic coatings and substrates. As a result, clear microstructures are revealed across the specimen surface and valuable information is obtained.

scholarly journals Study of Selected Properties of Thermally Sprayed Coatings Containing WC and WB Hard Particles

2016 ◽  
Vol 10 (4) ◽  
pp. 296-299 ◽  
Author(s):  
Janette Brezinová ◽  
Anna Guzanová ◽  
Dagmar Draganovská ◽  
Pavlo O. Maruschak ◽  
Mariana Landová
Keyword(s):  
Base Material ◽  
Metallographic Analysis ◽  
Wear Resistant Coatings ◽  
Hard Particles ◽  
Analysis Measurement ◽  
Thermally Sprayed Coatings ◽  
Steel Aisi ◽  
Pin On Disk ◽  
Thermally Sprayed ◽  
Sprayed Coatings

Abstract The paper presents results of research of the essential characteristics of two kinds of advanced coatings applied by HVOF technology. One studied coating: WB-WC-Co (60-30-10%) contains two types of hard particles (WC and WB), the second coating is eco-friendly alternative to the previously used WC-based coatings, called “green carbides” with the composition WC-FeCrAl (85-15%). In green carbides coating the heavy metals (Co, Ni, NiCr) forming the binding matrix in conventional wear-resistant coatings are replaced by more environmentally friendly matrix based on FeCrAl alloy. On the coatings was carried out: metallographic analysis, measurement of thickness, micro-hardness, adhesion, resistance to thermal cyclic loading and adhesive wear resistance (pin-on-disk test). One thermal cycle consisted of heating the coatings to 600°C, dwell for 10 minutes, and subsequently cooling on the still air. The number of thermal cycles: 10. The base material was stainless steel AISI 316L, pretreatment prior to application of the coating: blasting with white corundum, application device JP-5000.

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