Comparative Study of WC-Cermet Coatings Sprayed via the HVOF and the HVAF Process

Jacobs, L.; Hyland, Margaret; Bonte, Marc De

doi:10.1361/105996398770350954

Cited by 100 publications

(42 citation statements)

References 5 publications

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“…The coatings show better adhesive performance, possibly because the particle was firmly embedded in the substrate at high velocity by using HVOF spraying and the residual compressive stress could also be a reason. It has been reported that higher adhesion strength (>80 MPa) of coatings could be obtained in both the HVOF and the HVAF systems [25].…”

Section: Mechanical Propertiesmentioning

confidence: 97%

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

et al. 2017

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Abstract:In this work, the Cr 3 C 2 -25% NiCr powder was deposited on stainless steel with different combustion pressures and powder feed rates using HVOF technique. The microstructure, porosity, micro-hardness, indentation fracture toughness, adhesion strength, and wear resistance at 500 • C of the coatings were investigated. The results showed that HVOF sprayed Cr 3 C 2 -25% NiCr coatings possessed low porosity, high micro-hardness, and enough adhesion strength. The powder feed rate had obvious effect on porosity, micro-hardness and indention fracture toughness of the coatings, and the coating sprayed under the powder feed rate of 33.5 g/min possessed the optimal performance. The wear tests illustrated that the HVOF sprayed Cr 3 C 2 -25NiCr coating possessed good wear resistance at the temperature of 500 • C, in which the coating sprayed at the powder feed rate of 33.5 g/min had the best wear resistance due to its dense structure and enough fracture toughness.

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Section: Mechanical Propertiesmentioning

confidence: 97%

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

et al. 2017

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“…Figure 6 represents the XRD results for the as-received powder ( Fig. 6(a)) and as-sprayed coating spraying of WC particles and therefore the presence of W 2 C peaks can be expected in the analysis [5]. The other XRD results from specimens heated in air showed the formation of metal oxides of (NiWO 4 , WO 3 , CrO 2 , CrWO 4 ) for all three heat treatment temperatures (300, 500 and 700°C).…”

Section: Wds and Xrd Resultsmentioning

confidence: 82%

“…shown that the presence of the W 2 C phase in the coating is an indication of the decarburization reactions that take place during spraying [5]. Additionally, it has been discussed that during the combustion process, the decarburization of tungsten carbide to tungsten (W) and reaction of tungsten with other binding metals can form complex compounds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Wear Performance of Nanostructured WC-Ni/Cr HVOF Sprayed Coatings

2017

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The extraction and processing of bitumen from oil sands exposes machinery parts to constant abrasive wear which can cause severe surface degradation and component failure, resulting in production shut-downs. To reduce the effect of wear on performance of production machinery, wear resistant coatings must be used to extend component life. Recently, thick microstructured cermet coatings based on WC dispersions have been used to protect surfaces. In this study a nanostructured 83WC-17Ni/Cr coating was deposited on to C-Mn steel surfaces using High Velocity Oxy-Fuel (HVOF) spraying. The effect of heat treatment in air and nitrogen atmosphere on changes in the microstructure, hardness and wear resistance was investigated. The results showed that both the hardness and wear resistance increased with increasing heat treatment temperature in both air and nitrogen atmosphere. However, the use of heat treatments in air led to the formation of brittle metal oxides which resulted in micro-cracking within the coatings. This caused the coatings to fail by brittle fracture during wear testing. In comparison heat treatment in nitrogen produced better wear resistance because metal oxide formation was avoided.

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“…8) This result implies that the HVAF spraying possesses a lower flame energy than the HVOF spraying because the former combusts smaller amount of fuel than the latter when campared at the same volume of supply gas. Therefore, the higher oxygen ratio in the supply gas was expected to be necessary to get the higher flame energy.…”

Section: )mentioning

confidence: 99%

Oxidation Restriction of In-flight Particles upon GS-HVOF Spraying by Nitrogen Addition to Combustion Gas

Kawakita

Katayama

2004

Mater. Trans.

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In order to improve the environmental barrier property of coatings fabricated by the HVOF spray process with a gas shroud, their oxygen content of 0.19 mass% as the lowest conventional figure was still more reduced by changing the composition of combustion gas. Introduction of nitrogen gas to the combustion chamber lowered the temperature of the in-flight spray particles while maintaining their high velocity. This method could reduce the oxygen level of a HastelloyC coating to 0.063 mass% at the lowest present value, which is comparable to that of the feedstock with 0.042 mass%. Other coating with 0.14 mass% could be obtained along with the open porosity below 0.1 vol%. The latter coating exhibited the improved environmental barrier property in artificial seawater.

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Comparative Study of WC-Cermet Coatings Sprayed via the HVOF and the HVAF Process

Cited by 100 publications

References 5 publications

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

Influence of Process Parameters on High Velocity Oxy-Fuel Sprayed Cr3C2-25%NiCr Coatings

Effect of Heat Treatment on Wear Performance of Nanostructured WC-Ni/Cr HVOF Sprayed Coatings

Oxidation Restriction of In-flight Particles upon GS-HVOF Spraying by Nitrogen Addition to Combustion Gas

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