Processing optimization, surface properties and wear behavior of HVOF spraying WC–CrC–Ni coating

Fang, Wei; Cho, T.Y.; Yoon, Jeong Hyun; Song, Ki Oh; Hur, Sung Kang; Youn, S.J.; Chun, Hui-Gon

doi:10.1016/j.jmatprotec.2008.08.024

Cited by 96 publications

(33 citation statements)

References 15 publications

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“…High-velocity oxy-fuel (HVOF) is one of the technologies, which formed coating such as Cr 3 C 2 -NiCr and WC-Co with very small porosity (a few %), high adhesion strength (above 80 MPa), high hardness, wear resistance, thermal stability, and corrosion resistance, and many more carbide particles remain in matrix compared with the plasma spraying process (Ref [1][2][3]. High wear resistance, hardness, thermal conductivity, and excellent wettability of chromium carbide by NiCr alloy and strong adhesion between phases has caused the Cr 3 C 2 -NiCr coatings to become one of the promising materials for use on highly loaded components made of ductile cast iron in the automotive and aerospace industries.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Tribological Properties of HVOF-Sprayed (Cr3C2-NiCr+Ni) Composite Coating on Ductile Cast Iron

Książek

Radecka

Richert

et al. 2016

J. of Materi Eng and Perform

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The aim of the investigations was to compare the microstructure, mechanical, and wear properties of Cr 3 C 2 -NiCr+Ni and Cr 3 C 2 -NiCr coatings deposited by HVOF technique (the high-velocity oxygen fuel spray process) on ductile cast iron. The effect of nickel particles added to the chromium carbide coating on mechanical and wear behavior in the system of Cr 3 C 2 -NiCr+Ni/ductile cast iron was analyzed in order to improve the lifetime of coated materials. The structure with particular emphasis of characteristic of the interface in the system of composite coating (Cr 3 C 2 -NiCr+Ni)/ductile cast iron was studied using the optical, scanning, and transmission electron microscopes, as well as the analysis of chemical and phase composition in microareas. Experimental results show that HVOF-sprayed Cr 3 C 2 -NiCr+Ni composite coating exhibits low porosity, high hardness, dense structure with large, partially molten Ni particles and very fine Cr 3 C 2 and Cr 7 C 3 particles embedded in NiCr alloy matrix, coming to the size of nanocrystalline. The results were discussed in reference to examination of bending strength considering cracking and delamination in the system of composite coating (Cr 3 C 2 -NiCr+Ni)/ductile cast iron as well as hardness and wear resistance of the coating. The composite structure of the coating provides the relatively good plasticity of the coating, which in turn has a positive effect on the adhesion of coating to the substrate and cohesion of the composite coating (Cr 3 C 2 -NiCr+Ni) in wear conditions.

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Section: Introductionmentioning

confidence: 99%

Mechanical and Tribological Properties of HVOF-Sprayed (Cr3C2-NiCr+Ni) Composite Coating on Ductile Cast Iron

Książek

Radecka

Richert

et al. 2016

J. of Materi Eng and Perform

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“…SEM micrographs (Fig. 3) shows that all coated surfaces have randomly distributed small pores with different sizes and lamellar structure which is characteristic for these kinds of coatings [5][6][7][8]. All coated samples have the same phases, WC, W 2 C, and Co phases, as seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…WC-Co cermet surface coatings are commonly used to enhance the high hardness, wear resistance, thermal stability, and corrosion resistance of many types of engineering components, deposited via air plasma (APS) and HVOF spraying. It has been well established that thermally sprayed WC-Co coatings can exhibit complex, multiphase microstructures, with a significantly lower volume fraction of primary carbide than that of their starting powders [4][5][6][7]. The degree of decomposition of the powders during spraying, resulting from these complex microstructures, depends primarily upon two factors, the time-temperature history of the particle and the particle characteristics such as size, porosity, and WC grain size within the particle.…”

Section: Introductionmentioning

confidence: 99%

“…Decomposition occurs due to high temperatures and low velocities and the use of small carbide grain sizes within the powder particles, all of which promote carbide dissolution in the molten matrix and * corresponding author; e-mail: yyarali@sakarya.edu.tr subsequent decarburization. However, while decomposition has been reported to affect wear behavior, low temperature spraying has, in some cases, shown to produce coatings with poorer adhesion between the splats, again resulting in high rates of wear [5][6][7][8][9]. Steel allows the weldability of cemented carbides so it is recommended to join cemented carbide towards steel therefore; studies have been made to reveal the thermal stability and the reaction products of tungsten carbide and steel [10].…”

Section: Introductionmentioning

confidence: 99%

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The Mechanical Properties and Wear Resistance of HVOF Sprayed WC-Co Coatings

2016

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In this work, the Woka 5810 powders (88% tungsten carbide-12% cobalt) were used to produce coating by high velocity oxy-fuel spraying. WC-Co is widely used as a tribological coating material providing a combination of high toughness, high hardness, and good strength. The treated samples were characterized by using optical micrograph, stereo microscope and scanning electron microscopy, X-ray diffractometry, and microhardness tests. Also the wear performance of the coatings was investigated. The results indicated that the coating shows slight higher microhardness and better abrasive wear resistance than the conventional counterpart. The friction coefficient of coating was low. The scanning electron microscopy and energy dispersive spectroscopy analyses were applied to worn surfaces.

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“…This Through laboratory wear test was possible to observe a coefficient of friction with a value of 4.2 on the coated surface, which was lower than the value of 6.6 found on the regular surface. In a qualitative way, the coated sample showed less wear on the pin-on-disc test [12]. Table 4 presents the comparison between the production results obtained with the regular tool and the batch forged with the coated tool.…”

Section: Wear Test-pin-on-disc Methodsmentioning

confidence: 99%

Analysis of Forging Dies Coated with Tungsten Carbide through HVOF Processing

Souza¹,

Marques²,

Huff³

et al. 2016

JMEA

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Abstract:In this paper we present a performance evaluation of thermal spraying coated hot forging dies conducted in a production line. The High Velocity Oxy-Fuel process was used for the deposition of a tungsten carbide coating, which is characterized by its optimal adherence and low porosity. A metallurgical characterization of the layer was previously done, in order to obtain reference information to assist in the interpretation of the practical tests results. The coated die allowed an increase in productivity of 37.5%, besides better dimensional stability results through the process and legibility of printed numbers.

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Processing optimization, surface properties and wear behavior of HVOF spraying WC–CrC–Ni coating

Cited by 96 publications

References 15 publications

Mechanical and Tribological Properties of HVOF-Sprayed (Cr3C2-NiCr+Ni) Composite Coating on Ductile Cast Iron

Mechanical and Tribological Properties of HVOF-Sprayed (Cr3C2-NiCr+Ni) Composite Coating on Ductile Cast Iron

The Mechanical Properties and Wear Resistance of HVOF Sprayed WC-Co Coatings

Analysis of Forging Dies Coated with Tungsten Carbide through HVOF Processing

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