Dry sliding wear behaviour of HVOF thermal sprayed WC-Co-Cr and WC-CrxCy-Ni coatings

Song, Bo; Murray, James W.; Wellman, R.G.; Pala, Zdeněk; Hussain, Tanvir

doi:10.1016/j.wear.2019.203114

Cited by 38 publications

(13 citation statements)

References 56 publications

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“…For all samples, at the coatings-substrate interface it could be seen well adhered coating material, which good fi lled substrate surface irregularities. On the crosssection views a good mechanical interlocking with the substrate [34,35]. Such type of structure is a result of the HVOF spraying technology [36].…”

Section: Coatings Microstructurementioning

confidence: 99%

Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates

Jonda¹,

Łatka²

2021

Adv. Sci. Technol. Res. J.

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Magnesium alloys are very interesting engineering materials due to their very high strength to density ratio (the best among metallic alloys). However, because of low hardness as well as low resistance against erosion, abrasion and corrosion, their applications in the industry is very limited. In order to improve mechanical performances, deposition of hardening coating by thermal spraying was proposed. In this work, the WC-based coatings with different binder (Co or Ni) and co-hardening additives (Cr or Cr 3 C 2 ) manufactured by high velocity oxy-fuel (HVOF) were studied. These coatings were deposited onto AZ31 magnesium alloy. The crucial problem is obtaining goodadhered coating without damage the substrate, because of relatively low temperature resistance of magnesium alloys (about 300 °C). To solve this problem, HVOF method, which is low temperature and high velocity, was proposed. Also an important role plays process parameters (e.g. spray distance, fuel medium, type of nozzle). The goal of the study was to compare three types of cermet coatings manufactured from commercially available powders (WC-Co, WC-Co-Cr and WC-Cr 3 C 2 -Ni) in terms of their microstructure features, microhardness, instrumented indentation and fracture toughness. Results revealed that selected process parameters made it possible to obtain well-adhered coating with good fulfillment of the surface unevenness of the AZ31 substrate. The most noticeable effect was influence of cobalt matrix on higher hardness (1.4 -1.6 GPa) and Young modulus (330 -340 GPa) of deposited coatings in compare to the nickel matrix ones (1.2 GPa and 305 GPa, respectively). The same trend was observed in case of fracture toughness, c.a. 6.5 MPa•m 1/2 for Co-matrix and 4.9 MPa•m 1/2 for Ni-matrix.

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Section: Coatings Microstructurementioning

confidence: 99%

Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates

Jonda¹,

Łatka²

2021

Adv. Sci. Technol. Res. J.

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“…All coatings are characterized by relatively dense and homogeneous structure. Such type of structure is typical for HVOF coatings [32][33][34][35]. Moreover, the thickness of the deposited coatings was c.a.…”

Section: Microstructure Of the Coatingsmentioning

confidence: 90%

The Effect of Spray Distance on Porosity, Surface Roughness and Microhardness of WC-10Co-4Cr Coatings Deposited by HVOF

Górnik

Jonda

Nowakowska

et al. 2021

Advances in Materials Science

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The paper presents the computational studies on the microstructure of WC-Co-Cr coatings deposited by High Velocity Oxy Fuel spraying (HVOF). The study covers the porosity assessment according to ASTM E2109-01 standard, carried out in ImageJ software, in terms of volume porosity, size and shape of the pores. The evaluation was preceded by scanning electron microscope (SEM) observations at magnifications of 2000x and 5000x. Additionally, topography analysis has been performed by confocal laser scanning microscope (CLSM), and the surface roughness Ra was evaluated by the contact method with use of a stylus profilometer. Finally, the influence of porosity was observed for coatings microhardness HV0.3. According to the results, the total closed porosity was found to be in the range of 5.01 vol.% and 5.38 vol.%. The dominated pores in the coatings were of size 0.1-1.0 μm. Studies showed that HVOF process enabled deposition of dense coatings, characterized by homogenous distribution of pores and low roughness.

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“…In modern research, the type of coating, paste is still used for carburizing [12], chromium-nickel plating [13], Fe-TiB2 [14] with plasma heating by a non-consumable electrode system in an inert gas (TIG). It is known that chromium carbides (CrxCy) are repeatedly added to matrix compositions to improve the hardened property [15][16][17]. The combination of the hard CrxCy component in the tin-bronze alloy during plasma heating to high temperatures can increase the solubility of chromium in the soft Cu matrix, thereby improving the properties of the resulting coating as compared to a pure Cu-Sn coating.…”

Section: Introductionmentioning

confidence: 99%

Study of the Formation of the Alloyed Surface Layer During Plasma Heating of Mixtures of Cu-Sn/CrXCY Alloys

Nguyen¹,

Astafeva²,

Balanovskiy³

2021

Tribol. Ind.

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In this work, to assess the possibility of obtaining an alloyed layer by plasma heating of the mixture of the PRV-BrO10 alloy and the coating of the welding electrode OK 84.78. The study of the structure is given using the optical microscope MET-2 and the measurement of microhardness -hardness testers of the HMV-G series. It is established that with a thin layer of pre-coating, the coatings are completely saturated, and with a thick layer -the formed zones are different in microstructure and microhardness. In the case of 0.25 mm precoating thickness, the addition of chromium carbide leads the strong increasing of the hardness compared to tin-bronze alone. In the case of 0.50 mm pre-coating thickness, for the upper soft zone rich in copper, the average microhardness value is below 250 HV, and for hard particles in this zone in the range of 500-700 HV, the lower saturated zones have high hardness in a wide range . The slow scanning speed of the torch and a thick layer of pre-coating are the reason for incomplete saturation and the appearance of defects on the surface of St3 steel.

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Dry sliding wear behaviour of HVOF thermal sprayed WC-Co-Cr and WC-CrxCy-Ni coatings

Cited by 38 publications

References 56 publications

Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates

Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates

The Effect of Spray Distance on Porosity, Surface Roughness and Microhardness of WC-10Co-4Cr Coatings Deposited by HVOF

Study of the Formation of the Alloyed Surface Layer During Plasma Heating of Mixtures of Cu-Sn/CrXCY Alloys

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