Comparative study on the corrosion and wear behavior of plasma-sprayed vs. high velocity oxygen fuel-sprayed Al8Si20BN ceramic coatings

2018 ◽  
Vol 44 (11) ◽  
pp. 12180-12193 ◽  
Author(s):  
Mitra Akhtari Zavareh ◽  
Ehsan Doustmohammadi ◽  
Ahmed A.D.M Sarhan ◽  
Ramin Karimzadeh ◽  
Pooria Moozarm Nia ◽  
...  
Keyword(s):  
Comparative Study ◽  
High Velocity ◽  
Wear Behavior ◽  
Ceramic Coatings ◽  
Corrosion And Wear ◽  
High Velocity Oxygen Fuel ◽  
Plasma Sprayed ◽  
Oxygen Fuel

Comparative analysis of tribological behavior of plasma- and high-velocity oxygen fuel-sprayed WC-10Co-4Cr coatings

2017 ◽  
Vol 69 (2) ◽  
pp. 325-332 ◽  
Author(s):  
Shiyu Cui ◽  
Qiang Miao ◽  
Wenping Liang ◽  
Yi Xu ◽  
Baiqiang Li
Keyword(s):  
Plasma Spraying ◽  
High Velocity ◽  
Wear Mechanisms ◽  
Wear Behavior ◽  
High Velocity Oxygen Fuel ◽  
Hvof Spraying ◽  
Content Type ◽  
Q235 Steel ◽  
Oxygen Fuel ◽  
Sprayed Coatings

Purpose The purpose of this study is to prepare WC-10Co-4Cr coatings using two processes of plasma spraying and high-velocity oxygen fuel (HVOF) spraying. The decarburization behaviors of the different processes are analyzed individually. The microstructural characteristics of the as-sprayed coatings are presented and the wear mechanisms of the different WC–10Co–4Cr coatings are discussed in detail. Design/methodology/approach The WC–10Co–4Cr coatings were formed on the surface of Q235 steel by plasma and HVOF spraying. Findings Plasma spraying causes more decarburizing decomposition of the WC phase than HVOF spraying. In the plasma spraying process, η(Cr25Co25W8C2) phase appears and the C content decreases from the top surface of the coating to the substrate. Practical implications In this study, two WC–10Co–4Cr coatings on Q235 steel prepared by plasma and HVOF spraying were compared with respect to the sliding wear behavior. Originality/value The wear mechanisms of the plasma- and HVOF-sprayed coatings were abrasive and oxidation, respectively.

Study on Replacement of EHC Using HVOF Sprayed Coatings

2012 ◽  
Vol 518-523 ◽  
pp. 3984-3988
Author(s):  
Bai Lin Zha ◽  
Xiao Jing Yuan ◽  
De Wen Wang
Keyword(s):  
Wear Resistance ◽  
Environmental Protection ◽  
High Velocity ◽  
Corrosion And Wear ◽  
Worker Safety ◽  
High Velocity Oxygen Fuel ◽  
Safety Measures ◽  
Hard Chrome ◽  
Oxygen Fuel ◽  
Sprayed Coatings

Environmental protection and worker safety measures against the extensively used hard chrome plating (EHC) is becoming more stringent, which leads to the development and application of alternative technology. As one of the most promising replacement technology of EHC, WC/Co coatings deposited by High Velocity Oxygen Fuel (HVOF) have well performances in corrosion and wear resistance. The paper analyzed technical characteristics, property and cost of EHC and HVOF deposited WC-Co coatings, while results show that performance of HVOF sprayed WC-Co coatings is superior or equal to EHC with much higher expense, so current replacement of EHC by HVOF centers airplane and military arm field which have relatively higher profit.

Characteristics of MCrAlY Coatings Sprayed by High Velocity Oxygen-Fuel Spraying System

1999 ◽  
Vol 122 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Y. Itoh ◽  
M. Saitoh ◽  
M. Tamura
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
High Velocity ◽  
Gas Turbines ◽  
High Velocity Oxygen Fuel ◽  
Hvof Spraying ◽  
Vacuum Plasma ◽  
Mcraly Coatings ◽  
Plasma Sprayed ◽  
Oxygen Fuel

High velocity oxygen-fuel (HVOF) spraying system in open air has been established for producing the coatings that are extremely clean and dense. It is thought that the HVOF sprayed MCrAlY (M is Fe, Ni and/or Co) coatings can be applied to provide resistance against oxidation and corrosion to the hot parts of gas turbines. Also, it is well known that the thicker coatings can be sprayed in comparison with any other thermal spraying systems due to improved residual stresses. However, thermal and mechanical properties of HVOF coatings have not been clarified. Especially, the characteristics of residual stress, that are the most important property from the view point of production technique, have not been made clear. In this paper, the mechanical properties of HVOF sprayed MCrAlY coatings were measured in both the case of as-sprayed and heat-treated coatings in comparison with a vacuum plasma sprayed MCrAlY coatings. It was confirmed that the mechanical properties of HVOF sprayed MCrAlY coatings could be improved by a diffusion heat treatment to equate the vacuum plasma sprayed MCrAlY coatings. Also, the residual stress characteristics were analyzed using a deflection measurement technique and a X-ray technique. The residual stress of HVOF coating was reduced by the shot-peening effect comparable to that of a plasma spray system in open air. This phenomena could be explained by the reason that the HVOF sprayed MCrAlY coating was built up by poorly melted particles. [S0742-4795(00)00701-8]

Isothermal oxidation resistance comparison between air plasma sprayed, vacuum plasma sprayed and high velocity oxygen fuel sprayed CoNiCrAlY bond coats

2010 ◽  
Vol 204 (15) ◽  
pp. 2499-2503 ◽  
Author(s):  
Martina Di Ferdinando ◽  
Alessio Fossati ◽  
Alessandro Lavacchi ◽  
Ugo Bardi ◽  
Francesca Borgioli ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
High Velocity ◽  
Isothermal Oxidation ◽  
High Velocity Oxygen Fuel ◽  
Air Plasma ◽  
Bond Coats ◽  
Vacuum Plasma ◽  
Plasma Sprayed ◽  
Oxygen Fuel
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