Process and properties of TiC0.7N0.3-based cermet coating deposition on steel by electrospark deposition technique

Molybdenum alloying or modified layer was fabricated on the H13 steel substrate by electronic spark deposition technique (EDS). The microstructure, element distribution and microhardness of the modified layer were analyzed using metalloscope, X-ray diffraction (XRD), Glow Discharge Optical Emission Spectroscopy (GDOES) and microhardness tester, respectively. The modified layer is composed of white layer, diffuse layer and heat affected zone. The interdiffusion between Mo element and other elements in H13 substrate results in Metallurgical bonding. Microhardness of the coating is 1482HK0.025 which is 5 times higher than that of H13 steel base (280HK0.025). The ball-on-disc dry sliding test indicates that the friction coefficient of H13 substrate is decreased obviously by the molybdenum modified layer. The wear mass loss of Mo modified H13 substrate is only one seventh of that of the substrate. The wear resistance of H13 is improved significantly by the Mo modified layer.

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EFFECT OF La2O3 ADDITION ON MICROSTRUCTURE AND WEAR BEHAVIOR OF ELECTROSPARK DEPOSITED Ni-BASED COATINGS

Surface Review and Letters ◽

10.1142/s0218625x13500601 ◽

2013 ◽

Vol 20 (06) ◽

pp. 1350060 ◽

Cited By ~ 2

Author(s):

GAO YUXIN ◽

YI JIAN

Keyword(s):

Wear Resistance ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Wear Behavior ◽

Deposition Technique ◽

Electrospark Deposition ◽

X Ray ◽

Wear Process ◽

Hardness Tester ◽

Scanning Electron

La 2 O 3 doped Ni -based coatings have been prepared by electrospark deposition technique. The effect of La 2 O 3 on the microstructure, hardness and wear behavior of the as-prepared Ni -based coatings is investigated by using X-ray diffractometer, scanning electron microscope, wear tribometer and Vickers hardness tester. Results indicates that the microstructure, hardness and wear resistance of La 2 O 3 doped Ni -based coatings are effectively improved as compared to the undoped one, and the coating with the addition of 2.5 wt.% La 2 O 3 shows the optimal improvement effects. The addition of La 2 O 3 can reduce the defects, refine grains and increase hardness of the coating, which can inhibit the nucleation and propagation of cracking, consequently resist cutting and fracture during the wear process. Moreover, the addition of La 2 O 3 leads to changes in abrasion mechanism of the coatings, and the reasons resulting in different abrasion mechanisms are discussed.

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Arc Plasma Deposition of TiO2 Nanoparticles from Colloidal Solution

Metallurgical and Materials Engineering ◽

10.30544/587 ◽

2020 ◽

Vol 26 (4) ◽

pp. 341-348

Author(s):

Vesna Maksimović ◽

Milovan Stoiljković ◽

Vladimir Pavkov ◽

Jovan Ciganović ◽

Ivana Cvijović‐Alagić

Keyword(s):

Electron Microscopy ◽

Surface Properties ◽

Plasma Deposition ◽

Arc Plasma ◽

Tio2 Layer ◽

Deposition Technique ◽

Implant Surface ◽

Metallic Implant ◽

Coating Deposition ◽

Cp Ti

Surface modifications of metallic biomaterials can in great merit, improve the properties of the hard-tissue implants and in that way contribute to the success of the surgical implantation process. Coating deposition stands out as one of the many surface-modifying techniques that can be used to improve implant surface properties and, in turn, induce successful osseointegration. Deposition of the TiO2 layer on the surface of the metallic implants has a great potential to enhance not only their osseointegration ability but also their biocompatibility and corrosion resistance. In the present study, the possibility of successful deposition of the TiO2 layer on the surface of commercially pure titanium (CP-Ti), as the most commonly used metallic implant material, by spraying the colloidal nanoparticles aqueous solution in the electric discharge plasma at atmospheric pressure was investigated. To characterize the colloidal TiO2 nanoparticle solution, used for the coating deposition process, transmission electron microscopy (TEM) was utilized, while scanning electron microscopy (SEM) and optical profilometry were used to investigate the deposited surface layer morphology and quality. Estimation of the deposited film quality and texture was used to confirm that the arc plasma deposition technique can be successfully used as an advanced and easy-to-apply method for coating the metallic implant material surface with the bioactive TiO2 layer which favors the osseointegration process through the improvement of the implant surface properties. The TiO2 coating was successfully deposited using the arc plasma deposition technique and covered the entire surface of the CP-Ti substrate without any signs of coating cracking or detachment.

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