Electro spark deposition of WC–TiC–Co–Ni cermet coatings on St52 steel

Aghajani, Hossein; Hadavand, Ebrahim; Peighambardoust, Naeimeh Sadat; Khamenehasl, S H

doi:10.1016/j.surfin.2019.100392

Cited by 29 publications

(10 citation statements)

References 28 publications

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“…The production of ESD protective coatings has also found wide application in the automotive industry [ 24 ]. Many works have been devoted to assess the effect of electro-spark deposition parameters on the properties of coatings [ 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Laser Beam Processing on the Properties of WC-Co Coatings Deposited on Steel

et al. 2021

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The main objective of the present work is to determine the effects of laser processing on properties of WC-Co electro-spark deposited (ESD) coatings on steel substrates. Tungsten carbide coatings have been applied to steel substrates using a manual electrode feeder, model EIL-8A. The laser beam processing (LBP) of electro-spark coatings was performed using an Nd:YAG fiber laser. The microstructure and properties of laser treated/melted coatings were evaluated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), surface geometric structure (SGS) and roughness measurements and adhesion, microhardness, residual stresses, corrosion resistance and application tests. The obtained experimental data were subjected to statistical analysis and multidimensional numerical and visual exploratory techniques. It has been shown conclusively that the laser-treated ESD WC-Co coatings are characterized by lower microhardness, higher resistance to corrosion, increased roughness and better adhesion to the substrate. LBP homogenizes the chemical composition, refines the microstructure and heals microcracks and pores of ESD coatings. The laser treated ESD WC-Co coatings can be used in frictional sliding nodes (e.g., on the front seal rings used in pumps) and as protective layers.

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Section: Introductionmentioning

confidence: 99%

The Effect of Laser Beam Processing on the Properties of WC-Co Coatings Deposited on Steel

et al. 2021

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“…Nevertheless, poor sinterability and fracture toughness of ZrB 2 has restricted its applications to some extent, which should be addressed in one way or another [9][10][11]. One possible solution to tackle the poor sinterability of ZrB 2 is implementing a modern sintering process like hot-press sintering (HP) and spark plasma sintering (SPS) in place of the conventional powder metallurgy technique [12][13][14][15][16]. The intrinsic characteristics of the HP and SPS routes have made them suitable to produce dense ZrB 2 -based ceramics at roughly low sintering temperatures [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Beneficial effect of low BN additive on densification and mechanical properties of hot-pressed ZrB2–SiC composites

Shafagh

Jafargholinejad

Javadian³

2021

Synth. Sinter.

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The incorporation of 1 wt% hexagonal BN (hBN) into ZrB2–30 vol% SiC could noticeably better the fracture toughness, hardness, and consolidation behavior of this composite. This research intended to scrutinize the effects of various amounts of hBN (0–5 wt%) on different characteristics of ZrB2–SiC materials. The hot-pressing method under 10 MPa at 1900 °C for 120 min was employed to sinter all designed specimens. Afterward, the as-sintered samples were characterized using X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), and Vickers technique. The hBN addition up to 1 wt% improved relative density, leading to a near fully dense sample; however, the incorporation of 5 wt% of such an additive led to a composite containing more than 5% remaining porosity. The highest Vickers hardness of 23.8 GPa and fracture toughness of 5.7 MPa.m1/2 were secured for the sample introduced by only 1 wt% hBN. Ultimately, breaking large SiC grains, crack bridging, crack deflection, crack branching, and crack arresting were introduced as the chief toughening mechanisms in the ZrB2–SiC–hBN system.

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“…Rukanskis [22] has shown the advantages of the economical use of ESD coatings on metal surfaces. Many of the research papers concern the deposition of anti-wear electro-spark coatings on steel substrates to improve their operating properties [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

et al. 2020

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Electro-spark deposition (ESD) and laser beam machining (LBM) are the technologies using the concentrated energy flux. This paper deals with the issue of the impact of laser modification on the morphology and mechanical properties of carbide/copper coatings produced by electro-spark treatment. The coatings were applied to C45 carbon steel samples using the EIL-8A device. The following three types of electrodes made using the powder metallurgy (PM) hot pressing technique, from copper and tungsten carbide powders of different percentage compositions, were used for the coatings: 25% WC and 75% Cu; 50% WC and 50% Cu; and 75% WC and 25% Cu. Laser modification of the surface layers was performed with an Nd:YAG laser. The research focused on the analysis of the morphology of coatings applied by electro-spark technology before and after laser processing. The analysis of the morphology of electro-spark coatings revealed that the coatings had microcracks and pores. The laser beam machining of ESD coatings led to the homogenization of chemical composition, fragmentation of the structure, and elimination of microcracks. In addition, measurements of porosity, microhardness, adhesion, and analysis of XRD phase composition of the electro-spark coatings were performed. Laser processing proved to have a positive effect on improving the adhesion of coatings and reducing their porosity. This paper also presents a simulation model of heat transfer processes for the case of laser radiation impact on a WC-Cu coating. The developed numerical model, describing the influence of laser treatment on the distribution of temperature fields in the heated material (at a given depth) is of significant importance in the development of treatment technologies. Laser-modified ESD coatings perform anti-wear and protective functions, which enable their potential application in means of transport such as rolling stock.

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Electro spark deposition of WC–TiC–Co–Ni cermet coatings on St52 steel

Cited by 29 publications

References 28 publications

The Effect of Laser Beam Processing on the Properties of WC-Co Coatings Deposited on Steel

The Effect of Laser Beam Processing on the Properties of WC-Co Coatings Deposited on Steel

Beneficial effect of low BN additive on densification and mechanical properties of hot-pressed ZrB2–SiC composites

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

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