The enhancement of the properties of WC-Co HVOF coatings through the use of nanostructured and microstructured feedstock powders

Guilemany, J.M.; Dosta, S.; Miguel, J.R.

doi:10.1016/j.surfcoat.2006.01.041

Cited by 165 publications

(104 citation statements)

References 20 publications

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“…The high kinetic energy of the sprayed powder particles will compensate for the lower thermal energy of the impacting droplets, leading to the fabrication of dense coatings, with porosity less than 1% ( Ref 296). HVOF spraying usually produces MMC coatings with WC content in excess of 80 wt.%, hardness of 800-1300 HV 0.3 and wear rates that are on the order of 4 9 10 À6 to 20 9 10 À6 mm 3 /N m after exposure to ASTM Standard G65 testing (Ref 302,304). Despite the advantages of the HVOF spraying process, changes in chemical composition, decarburization and possible oxidation of the sprayed powder, as a result of the high temperature of the flame, can occur.…”

Section: Advances In Science Andmentioning

confidence: 99%

The 2016 Thermal Spray Roadmap

et al. 2016

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Considerable progress has been made over the last decades in thermal spray technologies, practices and applications. However, like other technologies, they have to continuously evolve to meet new problems and market requirements. This article aims to identify the current challenges limiting the evolution of these technologies and to propose research directions and priorities to meet these challenges. It was prepared on the basis of a collection of short articles written by experts in thermal spray who were asked to present a snapshot of the current state of their specific field, give their views on current challenges faced by the field and provide some guidance as to the R&D required to meet these challenges. The article is divided in three sections that deal with the emerging thermal spray processes, coating properties and function, and biomedical, electronic, aerospace and energy generation applications.

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Section: Advances In Science Andmentioning

confidence: 99%

The 2016 Thermal Spray Roadmap

et al. 2016

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“…Higher hardness, strength, toughness and abrasion resistance than the conventional counterpart was reported in coatings obtained from nanostructured WC-Co feedstock powder due to the size effect [17,24]. However, other authors [5,15] revealed a decrease of sliding and abrasive wear resistance of nanostructured WC-Co coatings.…”

Section: Introductionmentioning

confidence: 92%

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

Myalska¹,

Dybowski²,

Moskal³

2017

Adv. Sci. Technol. Res. J.

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The different concepts of WC-Co thermally sprayed coatings improvement may be considered and the application of nanoparticles, as the mechanical strengthening addition, is one of them. Nanostructured WC-Co coatings are characterized by higher hardness than the coatings formed from micrometric WC grains; whereas coatings with bimodal distribution of particles reveal greater wear resistance than the coatings obtained exclusively from nano-sized powders. Mixed effect of the matrix reinforcement by nanoparticles and strong fix of the micron-sized WC grains was proposed as a possible reason for enhanced wear resistance of bimodal coatings. In order to obtain a bimodal distribution of particles in the material standard WC-Co (83-17) powder was mixed with nanometric TiC powder (40-100 nm). The amount of TiC in powder mixtures was in the range from 1 to 7 wt.%. The mixtures were deposited on steel substrate using HVAF method and also hot pressed in vacuum. The microstructure of obtained coatings and sinters was quantitatively evaluated. Sinters revealed more homogenous distribution of the nano-sized TiC particles than the coatings. The addition of nano-sized TiC in the case of coatings has led to the decrease of its porosity. The agglomeration of nano-sized TiC particles in the coatings results in the decrease of material's hardness.

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“…Both, density of corrosion current and corrosion potential were significantly lower for nanostructured coating. The reason of different corrosion resistance were differences in coatings microstructure, phase composition and porosity [15,16]. …”

Section: Corrosion Resistancementioning

confidence: 99%

Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders

Żórawski

Makrenek

Góral

2016

Archives of Metallurgy and Materials

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Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure and composition of WC-12Co nanostructured powder were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Investigations revealed nano grains of WC with the size in the range of 50-500 nm. The nanostructured sprayed coating was analysed by SEM and phase composition was investigated by X-ray diffractometer (XRD). A denser coating structure with higher hardness was observed compared to conventional coating with a small amount of W2C, WC1−x, W and some amorphous phase. Young’s modulus and hardness were determined by depth sensing indentation in HVOF sprayed WC-12Co nanostructured coatings. Results were compared to conventional coatings and the relevance of the nanostructure was analyzed. An indentation size effect was observed on the polished surface and cross-section of both coatings. Data provided by indentation tests at maximum load allow to estimate hardness and elastic modulus. Enhanced nanomechanical properties of conventional coating in comparison to nanostructured one were observed. Nanostructured coatings WC-12Co (N) revealed significantly better corrosion resistance.

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The enhancement of the properties of WC-Co HVOF coatings through the use of nanostructured and microstructured feedstock powders

Cited by 165 publications

References 20 publications

The 2016 Thermal Spray Roadmap

The 2016 Thermal Spray Roadmap

WC-Co COATINGS AND SINTERS MODIFIED WITH NANO-SIZED TiC MICROSTRUCTURE – QUANTITATIVE EVALUATION

Mechanical Properties and Corrosion Resistance of HVOF Sprayed Coatings Using Nanostructured Carbide Powders

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