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Properties of WC-Co coatings with Al2O3 addition

Radek Norbert

Production Engineering Archives

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2023

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Vol. 29, Iss. 1

94--100

EN

Properties of WC-Co coatings with Al2O3 addition on the C45 mild steel surface in acidic chloride solution were examined. The WC-Co-Al2O3 coatings on steel surfaces were deposited by an electro-spark (ESD) technique. The anti-corrosion properties of the coatings were mainly investigated by electrochemical methods. Moreover, the scanning electron microscope (SEM) was employed for the observation of the surface of materials. The structure of coatings depended on the composition of electrospark electrodes. In the WC80-Co5-Al2O315 coating, the largest corrosion resistance was shown. The corrosion rate of the specimen was approximately eight times smaller than the coating with out of Al2O3 addition. The aim of the research was to obtain, by adding alumina, an improvement in the functional properties of WC-Co coatings produced by the ESD method. Due to the original features of ESD coatings, they can be used in sliding friction pairs and as anti-wear coatings on cutting tools. C-Co coatings with AlO3 addition.

2

Operational properties of the cermet electro-spark coatings after laser treatment – technology and application

Radek Norbert, Pietraszek Jacek, Konstanty Janusz

System Safety : Human - Technical Facility - Environment

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2019

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Vol. 1, nr 1

797--804

EN

The paper is concerned with determining the influence of the laser treatment process on the properties of electro-spark coatings. The properties of the coatings after laser treatment were assessed based on following methods: microstructure and X-ray diffraction analysis, adhesion tests, roughness measurement, hardness tests, tribological properties and application tests. The tests were carried out on WC-Co coating (the anode) obtained by electro-spark deposition over carbon steel C45 (the cathode) and molten with a laser beam. The coatings were deposited by means of the EIL-8A and they were laser treated with the Nd:YAG. The tests show that the laser-treated electro-spark deposited WC-Co coatings are characterized by lower hardness, higher seizure resistance, roughness and adhesion. The laser treatment process causes the homogenization of the chemical composition, the structure refinement and the healing of microcracks and pores of the electro-spark deposited coatings. Laser treated electro-spark deposited coatings are likely to be applied in sliding friction pairs and as protective coatings.

3

The Electro-Spark Deposited WC-Cu Coatings Modified by Laser Treatment

Radek N., Konstanty J., Scendo M.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 4

2579--2584

EN

The main objective of the present work was to determine the influence of laser treatment on microstructure, X-ray diffraction, microhardness, surface geometric structure and roughness, corrosion resistance and tribological properties of coatings deposited on C45 carbon steel by the electro-spark deposition (ESD) process. The studies were conducted using WC-Cu electrodes produced by the powder metallurgy route. The tests show that the laser-treated electro-spark deposited WC-Cu coatings are characterized by higher corrosion resistance, surface roughness and seizure resistance which come at the expense of lower microhardness. The laser treatment process causes the homogenization of the chemical composition, structure refinement and healing of microcracks and pores of the electro-spark deposited coatings. Laser treated ESD coatings can be applied in sliding friction pairs and as protective coatings.

PL

W pracy badano wpływ obróbki laserowej na mikrostrukturę, skład fazowy, mikrotwardość, topografię powierzchni, chropowatość, odporność na korozję oraz własności tribologiczne powłok nakładanych na stal C45 metodą elektroiskrową (ESD). W badaniach wykorzystano elektrody WC-Cu otrzymane metodą metalurgii proszków. Badania wykazały, że pomimo nieco niższej mikrotwardości, powłoki poddane obróbce laserowej posiadają wyższą odporność na korozję, chropowatość oraz odporność na zatarcie. Ponadto, obróbka laserowa przyczynia się do rozdrobnienia ziarna i ujednorodnienia składu chemicznego powłoki, a także do usunięcia porów i mikropęknięć. Z badań wynika, że obrabiane laserowo powłoki otrzymywane metodą ESD mogą być z powodzeniem wykorzystywane do pracy w węzłach tarcia oraz jako powłoki ochronne.

4

Własności warstw stellitowych wytwarzanych na drodze osadzania elektroiskrowego

Depczyński W., Radek N.

Logistyka

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2010

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nr 6

PL

W pracy badano właściwości powłok nanoszonych elektroiskrowo na podstawie obserwacji mikrostruktury, badań odporności korozyjnej oraz pomiarów siły tarcia. Badania przeprowadzono wykorzystując stellit jako materiał powłokowy, nakładanej elektroiskrowo na próbki ze stali C45. W wyniku przeprowadzonych badań stwierdzono, że grubość otrzymanych warstw stellitowych wynosi 10÷15 ?m oraz że warstwy charakteryzują się brakiem porów i mikropęknięć i mają charakter połączenia dyfuzyjnego z podłożem. Mikrotwardość naniesionych warstw stellitowych jest około 2,5 razy większa, w stosunku do mikrotwardości materiału podłoża. Testy korozyjne wykazały większą odporność korozyjną warstw stellitowych, w odniesieniu do materiału podłoża. Powłoki tego typu wykazują zwiększoną odporność na zużycie oraz korozję.

EN

The paper is concerned with the properties of electro-spark deposited Stellite alloy coatings. The properties were determined by analyzing the microstructure and corrosion resistance of the layers and measuring the friction forces. The tests were conducted for Stellite alloy coatings electro-spark deposited over the C45 carbon steel substrate. It was found that the Stellite alloy layers were 10÷15 ?m in height, they had no pores or microcracks, and there was diffusive interaction with the substrate. Moreover, the microhardness of the Stellite layers was about 2.5 times higher than that of the substrate. The tests show that the electro-spark deposited Stellite coatings are characterized by higher higher resistance corrosion than that of the substrate. Coatings of this type provide improved wear and corrosion protection.