Research on microstructure and wear resistance of coatings obtained by adding nanoparticles of refractory compounds in laser cladding

2nd Conference on Plasma & Laser Research and Technologies

Murzakov, M.A.^1 ; Chirikov, S.N.^1 ; Markushov, Y.V.^1

National Research Nuclear University MEPhI, Moscow, Russia^1

关键词: Acceleration voltages;    Elemental compositions;    Metallographic microscope;    Refractory compounds;    Resistance measurement;    Technological characteristics;    Wavelength dispersive spectrometers;    X-ray microanalysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/747/1/012062/pdf
DOI  :  10.1088/1742-6596/747/1/012062

来源: IOP

【 摘 要 】

The paper is aimed at research of coatings, which are achieved by means of laser cladding with additives of nanoparticles of high-melting compounds in form of tungsten carbide and tantalum (WC and TaC). In the course of experiment, various ceramic powder concentrations were tested. Main technological characteristics were determined. Power density amounted to 0.68-0.98 MW/cm2. During the coating wear resistance measurement, it was discovered that increase in nanopowder concentration extended wear resistance of coating 2-6 times. Wear resistance measurement and wear coefficient calculation were performed using Brinell-Howarth method. The load was 15 N, load time was 10 minutes. Optical metallographic microscope Neophot-30 was used to study microstructure of the deposited coatings. To reveal microstructure of the deposited coatings, the samples were exposed to chemical etching. Elemental composition of the samples was determined by the methods of X- ray microanalysis in testing solution using electron microscope EVO-50 under acceleration voltage 10-20 kV (probe current 5-50 nA) using energy- and wavelength-dispersive spectrometers.