Materials Science and Technological Aspects of Electrospark Deposition of Nanostructured WC‐Co Coatings onto Titanium Substrates

Левашов, Е. А.; Zamulaeva, E. I.; Kudryashov, A. E.; Vakaev, P.V.; Петржик, М. И.; Sanz, Alejandro

doi:10.1002/ppap.200600148

Cited by 26 publications

(24 citation statements)

References 7 publications

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“…With an increase in the pulse energy, an increase in the diameter and time of the spark discharge occurs, as a result of which the erosion of the electrodes increases. The depth and size of the craters of the solidified material on the cathode grows and, as a result, the roughness increases [6][7][8][9][14][15]. In the ESD of the samples with initial roughness Ra=1.67, 2.5 and 3 μm, the roughness Ra of the coatings of all used electrodes at pulse energy up to 0.03 J is close to that of the initial titanium surface (Fig.…”

Section: J)mentioning

confidence: 91%

“…The ESD surface layer changes the friction conditions in two main directions: a change of surface composition, the structure, and the surface microgeometry change. It is known that most often after ESD the roughness of the coatings is higher than that of the base and the relatively high roughness of ESD coatings adversely affects the wear resistance of coated products [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Surface Topography and Roughness Parameters of Electrospark Coatings on Titanium and Nickel Alloys

Kostadinov¹,

Danailov²,

Dimitrova³

et al. 2021

Applied Engineering Letters

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This paper examines the topography and roughness of coatings of hard alloyed materials deposited by electrospark deposition (ESD) on titanium and nickel alloys with different initial roughness. The influence of the electrode materials and the energy parameters of the ESD process on the roughness parameters Ra, Rt, Rq, Rz, Rmax, on the depth of waviness Wt, the asymmetry Rsk, the excess Rku, on the depth of core roughness Rk and the depth of the reduced picks roughness Rpk was established. The conditions for ESD are indicated, under which the traces of the previous treatment are erased and the characteristics of the initial substrate surface are improved. The numerical values of the roughness parameters for electrospark coatings from five types of hard alloys and one type of TiB2 based electrode with nanosized additives have been established.

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Section: J)mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Surface Topography and Roughness Parameters of Electrospark Coatings on Titanium and Nickel Alloys

Kostadinov¹,

Danailov²,

Dimitrova³

et al. 2021

Applied Engineering Letters

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“…The grain size of WC in these electrodes was 1–2 µm and the residual porosity below 0.1 vol.‐%. The structures of both electrode materials were documented in a previous publication 4…”

Section: Experimental Partmentioning

confidence: 99%

Nanoparticle Dispersion Strengthened WC–C Based Coatings on Ti‐alloy Produced by Sequential Chemical Reaction Assisted Pulsed Electrospark Deposition

Левашов¹,

Zamulaeva²,

Pogozhev³

et al. 2009

Plasma Processes & Polymers

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IntroductionAs it is known, the method of pulsed electrospark deposition (PED) is being used to improve the service life of machine parts and instruments working under severe conditions. However, the surface roughness and friction coefficients of the PED coatings do not always meet the requirements of some applications, limiting the process applicability. Thus, PED process modification for coatings with low friction coefficients and surface roughness became important. In principle, the problem can be resolved with one of the following ways: [1][2][3] (a) use of low-energy discharge pulses, (b) deposition of thick coatings followed by their surface machining, and (c) smoothing the deposited coatings by surface finishing treatment with carbon-based electrodes. Typically, PED is carried out using hard alloy electrodes, e.g., cemented carbide alloy made of 92 wt.-% WC and 8 wt.-% Co. Comparative analysis of the coatings deposited on titanium alloys with microstructured and nanostructured WC-8% Co electrodes was reported in recent publications. [4,5] It was shown that the electrode structure strongly affects the resulting coating phase composition, structure, and tribological properties. For coatings deposited with nanostructured electrodes, the content of (Ti,W)C and W 2 C carbide phases in the coating composition was found to increase from 60 to 95%, the coating hardness increased from 5 to 8 GPa, while the friction coefficient K fr decreased from 0.7 to 0.3. Correspondingly, the service life of such coatings was found to increase by a factor of 2 to 3. Meanwhile, for some applications it is needed to further decrease K fr along with the coating endurance during the service life. In this work, we explored the effects of additional chemical reaction assisted PED (CRAPED) finishing In this work, we explored the effects of the electrode material constituents and structure on the composition, tribological properties, and roughness of electrospark deposited coatings. Nanostructured (WC grain size below 0.1 mm) and microstructured (WC grain size 1-2 mm) electrodes based on 92% WC-8% Co composition were used to produce coatings on titanium alloy substrates. Fine-pored graphite (FPG) and carbon-carbon fiber composite (CCFC) electrodes were additionally used for surface smoothing as a finishing operation. The use of the nanostructured electrodes resulted in the formation of fine-grained, hard, and wear-resistant coatings. Surface finishing treatment with graphite-containing electrodes was found to decrease friction coefficients and improve the wear resistance of coatings deposited with both nano-and microstructured electrodes. This finishing operation provided lower surface roughness, change in the phase composition of the coatings, and formation of surface graphite for solid lubrication. treatment with carbon electrodes on the phase composition, structure, surface roughness, and tribological properties of coatings deposited with micro-and nanostructured electrodes onto a titanium alloy. Experimental PartDeposition of coati...

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“…Tungsten carbidebased hard alloys with cobalt binders have become widespread as electrode materials for the fabrication of coatings [4][5][6][7][8]. However, these electrode materials have a high erosion resistance and transfer poorly to the cathode.…”

Section: Introductionmentioning

confidence: 99%

Electrospark Coatings Based on WC-Co Alloys with Aluminium Oxide and Carbon Additives

Pyachin¹,

Николенко²,

Бурков³

et al. 2013

MSA

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The structure and properties of coatings based on WC-Co alloys containing additives of 1% - 5% aluminium oxide and 2.5% - 4.5% carbon were investigated. The coatings had a nanocrystalline structure. Depending on the duration and frequency of the discharge pulses, the ratio between WC and W₂C in the coatings was different. The additives in the hard alloy allowed us increase the microhardness and wear resistance of the coatings by a factor of 2 - 3 in comparison to coatings created using a conventional WC-10%Co alloy.

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Materials Science and Technological Aspects of Electrospark Deposition of Nanostructured WC‐Co Coatings onto Titanium Substrates

Cited by 26 publications

References 7 publications

Surface Topography and Roughness Parameters of Electrospark Coatings on Titanium and Nickel Alloys

Surface Topography and Roughness Parameters of Electrospark Coatings on Titanium and Nickel Alloys

Nanoparticle Dispersion Strengthened WC–C Based Coatings on Ti‐alloy Produced by Sequential Chemical Reaction Assisted Pulsed Electrospark Deposition

Electrospark Coatings Based on WC-Co Alloys with Aluminium Oxide and Carbon Additives

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