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INFLUENCE OF THE DEPOSITION PARAMETERS ON MICROSTRUCTURE AND PROPERTIES OF HVOF SPRAYED WC-CRC-NI COATING
Vražina, Tomáš ; Šulák, Ivo ; Poloprudský, Jakub ; Zábranský, K. ; Gejdoš, P. ; Hadraba, Hynek ; Čelko, L.
This paper investigates the influence of thermal spray parameters of the high-velocity oxygen fuel (HVOF) process on the properties of cermet coatings prepared from commercially available Amperit 551 WC-CrC-Ni powder. Three different processing parameters were applied to optimize the production process with the aim to achieve preeminent mechanical properties and fully dense material without microstructural defects. The deposition was carried out by a GLC5 gun. The velocity and temperature of powder particles in the spray stream were monitored by Accuraspray Tecnar diagnostic tool. The quality of deposited coatings was analyzed by means of light microscopy, scanning electron microscopy, and X-ray diffraction. The chemical composition of the used powder and sprayed WC-CrC-Ni coating was determined by energy dispersive spectroscopy. It was found that the spray parameters have a negligible effect on the resulting microstructure and phase composition of the coating. However, the porosity and surface roughness were significantly affected by the variation in process parameters. To assess the basic mechanical properties of HVOF sprayed coating instrumented Vickers hardness measurements were utilized. The coating hardness reached mean values over 1400 HV 0.1 and the indentation modulus varied from 152-279 GPa.
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Vliv tepelného zpracování na mechanické vlastnosti slitiny FeNiB
Zábranský, Karel ; Jirásková, Yvonna
An influence of thermal treatment in the temperature range 150 - 350 °C on the structural and mechanical properties of an amorphous FeNiB alloy is investigated. The high tensile strength of 2200 MPa in the as-prepared amorphous state slightly decreases with increasing annealing temperature up to approximately 200 °C in opposite to microhardness where an increase is observed. Above 200 °C a pronounced deterioration of both characteristics is observed which reflects the embrittlement of amorphous structure without any indication of crystallization.
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Porovnání fyzikálních a chemických vlastností slitin Fe80Nb3Cu1B16 a Fe33,5Ni40Nb3Cu1Si13,5B9
Zábranský, Karel
Two FINEMET-type alloys FeNbCuB (F) and FeNiNbCuSiB (FNS) in the as-quenched amorphous, relaxed amorphous and nanocrystalline states have been investigated using Mössbauer spectroscopy, X-ray diffraction, magnetic and electrochemical methods. Present work summarizes the results obtained in the as-quenched and relaxed amorphous states. A partial substitution of Si for B and mainly of Ni for Fe (FNS-alloy) had a pronounced influence on the majority of the physical and chemical properties. A significant decrease in Curie temperature, an increase in crystallization temperature, a decrease in saturation magnetic polarization supported also by a decrease of hyperfine induction were observed.
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Physical and chemical properties of FINEMET-type alloys
Zábranský, Karel
FINEMET-type alloys Fe80Nb3Cu1B16 (FM1), Fe80Nb3Cu1Si6B10 (FM2), and Fe33,5Ni40Nb3Cu1Si13, 5B9 (FM3) are investigated in the amorphous states. The aim of these studies is to follow an influence of variations in metalloid (Si, B) and metal (Fe, Ni) elements on the structural, magnetic, chemical, and mechanical properties.
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Vliv tepelného namáhání na mechanické vlastnosti FeNiB amorfní slitiny
Zábranský, Karel ; Jirásková, Yvonna
An influence of thermal treatment in the temperature range of 150 - 350 °C on the structural and mechanical properties of an amorphous FeNiB alloy is investigated. The high tensile strength of 2200 MPa in the as-prepared amorphous state slightly decreases with increasing temperature of annealing up to approximately 200 °C in opposite to microhardness where an increase is observed. Above 200 °C a pronounced deterioration of both characteristics reflect the embrittlement of amorphous structure without any indications of crystallization.
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