Wear Characteristics of Ni-WC Powder Deposited by Using a Microwave Route on Mild Steel (original) (raw)
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Effect of WC Concentration on Abrasive Wear Properties of the Thermally Sprayed WC-Ni Coatings
2013
In this work the effects of WC concentration on abrasive wear behavior by thermally sprayed WC coating was evaluated using three body abrasive wear tester. A different combination of WC and NI coatings were deposited on steel substrates by flame spraying using powder with different WC concentrations (0 %, 12.5 %, 25 %, and 50 %). Flame torch was used for heating and coating of process. Microstructure properties of coated samples were evaluated using optical microscope and wear testing, were performed on the samples.. Experimental results were compared to determine which coating shows the best quality in terms of the wear resistance. It was found that wear resistance is strongly depend on percentage of WC up to a certain level of mixing after that wear resistance will start decreasing.
Materials Processing and Interfaces, 2012
This paper describes effect of the lanthanum oxide (La 2 O 3 ) and remelting on microstructure; hardness and abrasive wear behavior of Ni-WC composite powder flame sprayed coatings. It was found that La 2 O 3 modification and remelting of flame sprayed Ni-base composite coating refined the microstructure and increased microhardness and resistance to abrasive wear. La 2 O 3 modification and remelting of the coating increased hardness by 1.2 to 1.3 folds. Abrasive wear behavior of unmodified and La 2 O 3 modified coating in as spayed and re-melted conditions were studied against at different normal loads (5, 10, 15 and 20N) and abrasive mediums of 120 and 600 grit sizes. La 2 O 3 modified composite coating in re-melted condition showed minimum wear rate irrespective of normal load and abrasive medium. Abrasive wear study results were supported by SEM analysis of worn out surfaces.
Development of Ni-WC composite clad using microwave energy
Materials Today: Proceedings, 2017
Cladding of suitably designed materials on functional surface which are subjected to sever tribological loading can lead to increase in components life. Development of clad includes several techniques such as thermal spraying, High velocity oxy fuel and laser cladding. However cladding done through the above listed process pertain certain defects like cracks, distortion, poor adhesion strength etc.In the present work a new process method has been developed to clad Ni (matrix)-80 wt.%WC (reinforcement)-20 wt.% powder on poor wear resisting material through microwave irradiation of frequency 2.45GHz. The characterization of developed clad is done using X-ray diffraction (XRD), Field emission electron microscope (FE-SEM), Back scattered electron image and Vickers micro hardness. XRD pattern of developed composite clad showed presence of compounds like NiSi, NiW, and W 2 C phase. The wear resistant complex carbide phase have been seen in the structure of the clad transverse section showed good metallurgical bonding between the substrate and the developed clad.
Microwave Sintering of Electroless Ni Plated WC Powders
Gazi University Journal of Science, 2009
Nickel matrix reinforced with WC has been manufactured by microwave sintering at various temperatures. A uniform nickel layer on WC powders was deposited prior to sintering using electroless plating technique, allowing close surface contact than can be achieved using conventional methods such as mechanical alloying. The reactivity between WC powders to form compounds is controlled through Ni layer existing on the starting powders. A composite consisting of quaternary additions, a ceramic phase, WC, within a matrix of Ni WC and etc., has been prepared at the temperature range 500°C-900°C under Ar shroud. XRD (X-Ray diffraction, SEM (Scanning Electron Microscope), compressive testing and hardness measurements were employed to characterize the properties of the specimens. Experimental results carried out for 900°C suggest that the best properties as σmax and Vikers Hardness (HV) were obtained at 900°C and the microwave sintering of electroless Ni plated WC powders can be used to produce ceramic reinforced Nickel composites.
Fraction on Wear Properties of Nicrbsi / WC Coatings
2012
To increase the lifetime of mechanical parts submitted to severe abrasive environments, a strategy is to reinforce their top surface by depositing a more resistant layer. This approach is particularly interesting for metallic parts exhibiting a poor wear resistance at high temperature. The incorporation of a dispersed ceramic phase within the reinforcing layer is known to increase dramatically the resistance and hardness of the top surface layer. In the present work, laser cladding was used to process thick metal/ceramic coatings on steel substrates. Metal matrix composite (MMC) coatings composed of Ni-based alloy containing hard tungsten carbide particles have been considered to improve the wear resistance of steel parts (S235 low carbon steel). The secondary phase amount and its particle size have been studied. In order to limit the formation of cracks during the layer cooling down, subsequent to laser cladding, preand postheating at 400 °C of the samples were performed.
Wear, 2011
Present work reports on the investigation of sliding wear of cladding developed through a novel processing technique. Wear resistant WC10Co2Ni cladding was developed using microwave irradiation on austenitic stainless steel (SS-316). The microwave claddings were characterized through field emission scanning electron microscope (FESEM), X-ray elemental analysis, X-ray diffraction (XRD) and measurement of Vicker′s microhardness. The FESEM study showed good metallurgical bond with substrate and the clads are free of cracks. Clads were formed with partial dilution of a thin layer of the substrate. The clad is composed of relatively soft metallic matrix and uniformly distributed hard carbide phase with ‘skeleton’ likes structure. The developed clads exhibit an average microhardness of 1064 ± 99 Hv. The porosity of developed clad has been significantly less at approximately 0.89%. Tribological properties of cladding have been analyzed through pin on disc sliding method against an EN-31 (HRC-70) counter surface. The clads show significant resistance to sliding wear. Wear resistance was observed to be the better at lower sliding speeds. An unstable metallic oxide layer is formed during rubbing of clad surface. The loss of material from the mating surfaces is mainly due to spalling, growth of microcracks, and smearing of the unstable oxide layer.► Cermet cladding (WC10Co2Ni) developed using microwave heating. ► Dilution of material identified using electron microscopy and X-ray technique. ► Confirmed cermet cladding with composite characteristics. ► The approach appears suitable for producing crack and porosity free clads. ► Sliding wear resistance of the microwave clads has been evaluated.
Effect of deposition temperature on the wear behavior of WC-Co coated mild steel substrate
2019
Mild steel offers versatile properties at relatively lower cost. Therefore, the alloy has a large application base in the industry, nonetheless mild steel still possesses application limitations required by the increasing complexity and severity of service environments. Atomic-scale surface microstructure modification by rf magnetron sputtering deposition presents a technological solution to improve material properties and performance for a wide range of industrial applications. The focus of this work was to investigate and comment on the wear behavior of surface modified mild steel surfaces subjected to different deposition temperatures. The effect of deposition temperature on the surface morphology of the material is also reported and correlated to the wear performance. The results showed that resistance to dry sliding wear of mild steel increased with increasing deposition temperature as well as decreasing roughness. Keywords—mild steel; rf magnetron sputtering; wear perfomance
Surface & Coatings Technology, 2007
In present paper the influence of the tungsten carbide (WC) particle addition on the microstructure, microhardness and abrasive wear behaviour of flame sprayed Co-Cr-W-Ni-C (EWAC 1006) coatings deposited on low carbon steel substrate has been reported. Coatings were deposited by oxy-acetylene flame spraying process. Wear behaviour of coatings was evaluated using pin on flat wear system against SiC abrasive medium. It was observed that the addition of WC particle in a commercial Co-Cr-W-Ni-C powder coating increases microhardness and wear resistance. Wear behaviour of these coatings is governed by the material parameters such as microstructure, hardness of coating and test parameters (abrasive grit size and normal load). Addition of WC in a commercial powder coating increased wear resistance about 4-9 folds. WC modified powder coatings showed better wear resistance at high load. Heat treatment of the unmodified powder coatings improved abrasive wear resistance while that of modified powder coating deteriorated the wear resistance. SEM study showed that wear of coatings largely takes place by microgroove, crater formation and scoring. Electron probe micro analysis (E.P.M.A.) of unmodified and WC modified powder coating was carried out for composition and phase analysis.
Powder Metallurgy and Metal Ceramics, 2016
The effects of Fe and Cu on the wear behaviour of W-Ni alloys is investigated. W-Ni-Fe and W-Ni-Cu alloys are produced with six different compositions by the powder metallurgy technique. The microstructure is examined after shaping and sintering. Electron microscopy (SEM+EDS) and X-ray diffraction (XRD) are used to characterize the density, hardness, and grain size of W-Ni-Fe and W-Ni-Cu alloys produced by powder metallurgy technique. A pin-on-disc apparatus is used for the wear tests. All of the samples are tested under loads of 20 and 30 N, at a rate of 1 m/s and for five different sliding distances.