Microstructure and properties of HVOF-sprayed chromium alloyed WC–Co and WC–Ni coatings

Berger, Lutz‐Michael; Saaro, S.; Naumann, T.; Schorr, M.; Weihnacht, Volker; Thiele, S.; Suchánek, Jan

doi:10.1016/j.surfcoat.2008.04.019

Cited by 75 publications

(29 citation statements)

References 1 publication

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“…As for other WC-based hardmetal coatings [42], the three investigated coatings in this study showed a maximum wear rate at 45°. The study of the effect of impingement angle on erosion-corrosion behavior of HVOF WC-based coatings [43] demonstrates the greater vulnerability of the hardmetal coatings to solid/liquid streams impinging at higher angles, and this trend appears to exist over a range of solid loads.…”

Section: Erosion Wear Testsupporting

confidence: 56%

Comparative Study of Thermally Sprayed Coatings Under Different Types of Wear Conditions for Hard Chromium Replacement

et al. 2011

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The tribological properties of part surfaces, namely their wear resistance and friction properties, are decisive in many cases for their proper function. To improve surface properties, it is possible to create hard, wear-resistant coatings by thermal spray technologies. With these versatile coating preparation technologies, part lifetime, reliability, and safety can be improved. In this study, the tribological properties of the HVOF-sprayed coatings WC-17%Co, WC-10%Co4%Cr, WC-15% NiMoCrFeCo, Cr 3 C 2 -25%NiCr, (Ti,Mo)(C,N)-37%NiCo, NiCrSiB, and AISI 316L and the plasma-sprayed Cr 2 O 3 coating were compared with the properties of electrolytic hard chrome and surface-hardened steel. Four different wear behavior tests were performed; the abrasive wear performance of the coatings was assessed using a dry sand/ rubber wheel test according to ASTM G-65 and a wet slurry abrasion test according to ASTM G-75, the sliding wear behavior was evaluated by pin-on-disk testing according to ASTM G-99, and the erosion wear resistance was measured for three impact angles. In all tests, the HVOF-sprayed hardmetal coatings exhibited superior properties and can be recommended as a replacement for traditional surface treatments. Due to its tendency to exhibit brittle cracking, the plasma-sprayed ceramic coating Cr 2 O 3 can only be recommended for purely abrasive wear conditions. The tested HVOF-sprayed metallic coatings, NiCrSiB and AISI 316L, did not have sufficient wear resistance compared with that of traditional surface treatment and should not be used under more demanding conditions. Based on the obtained data, the application possibilities and limitations of the reported coatings were determined.

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Section: Erosion Wear Testsupporting

confidence: 56%

Comparative Study of Thermally Sprayed Coatings Under Different Types of Wear Conditions for Hard Chromium Replacement

et al. 2011

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“…Figure 8 shows the XRD patterns for the HVOF-sprayed NiCrBSi-SiC coatings and it is evident that the coatings mainly consist of γ -nickel-based face-centred cubic (fcc) structure as a principal phase. This situation is a feature common in all the nickel-based coated [24][25][26][27][28][29][30][31][32][33]. XRD patterns of the coatings have also revealed the presence of very low intensity peaks of Ni 4 B 3 , BNi 2 , BNi 3 , SiC and Cr 7 C 3 phases.…”

Section: Resultsmentioning

confidence: 78%

“…Carbon produces carbides with high hardness levels that improve the wear resistance of coatings [20,21]. Considerable research studies were carried out to examine the HVOF coatings [22][23][24][25][26][27]. Wear and corrosion resistance of NiCrBSi coating deposited using AC-HVOF technique was investigated by Liu et al [24].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and Wear Characteristics of High Velocity Oxygen Fuel (HVOF) Sprayed NiCrBSi–SiC Composite Coating on SAE 1030 Steel

et al. 2013

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In this paper, wear properties of NiCrBSi-SiC coatings were investigated using the ball-on-disk wear test. In experimental study, NiCrBSi-SiC powders were sprayed using a high-velocity oxygen fuel technique on an SAE 1030 steel substrate. Powder mixtures with different weight mixing ratios, NiCrBSi + 10 wt% SiC, NiCrBSi + 20 wt% SiC and NiCrBSi + 40 wt% SiC coatings were prepared. The deposited coatings are compared in terms of their phase composition, microstructure and hardness. It is proved that the degree of mixing of the NiCrBSi and SiC components in the powder has a massive effect on the phase composition, microstructure and hardness of the coatings. Wear tests were conducted on both the uncoated and coated substrates at same normal load, speed, and wear distance. It has been determined that the coated substrates exhibit a very good tribological performance in comparison to the uncoated substrate. The increase in the adhesive wear resistance provided by the

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“…Berger et al reported that when chromium is present as the binding metal in the matrix, compounds such as (WCr) 2 C can be formed within the coating. In general, it can be stated that formation of compounds other than WC can greatly influence the matrix microstructure and chemistry and consequently, mechanical properties, hardness and therefore, wear performance of the coatings will be affected [6].…”

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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Microstructure and properties of HVOF-sprayed chromium alloyed WC–Co and WC–Ni coatings

Cited by 75 publications

References 1 publication

Comparative Study of Thermally Sprayed Coatings Under Different Types of Wear Conditions for Hard Chromium Replacement

Comparative Study of Thermally Sprayed Coatings Under Different Types of Wear Conditions for Hard Chromium Replacement

Microstructural and Wear Characteristics of High Velocity Oxygen Fuel (HVOF) Sprayed NiCrBSi–SiC Composite Coating on SAE 1030 Steel

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

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