The item deals with the possibilities of utilization HVOF coatings in thermal cyclic loading conditions. There were evaluated three types of coatings based on WC-Co, WC-Co-Cr and Cr3C2-25NiCr. The quality of coatings was evaluated in terms of their adhesion as sprayed and also during the cyclic thermal loading, EDX analysis and evaluation of microhardness. Construction and structure of coatings...

A planar Bi–Sb multijunction thermal converter was fabricated on the LPCVD Si3N4/SiO2/Si3N4-diaphragm, prepared by silicon bulk micromachining, which thermally isolated a bifilar Ptor NiCr-heater and the hot junctions of a Bi–Sb thermopile from the silicon substrate. The voltage responsivity, the ac–dc transfer difference, and the fluctuations of the output thermoelectric voltage and heater res...

Highly scattering plasma-sprayed thermal barrier coatings (TBCs) present a challenge for optical diagnostic methods to monitor TBC delamination because scattering attenuates light transmitted through the TBC and usually degrades contrast between attached and delaminated regions of the TBC. This paper presents a new approach where reflectance-enhanced luminescence from a luminescent sublayer inc...

The transmission line pulse method (TLP) is used to characterise the reliability of bolometric GaAs microwave power-sensors. Two degradation mechanisms are identified during the degradation process of the absorbing NiCr termination, in which the input power is converted into heat. Simulations and a material analysis have been performed in order to characterise the observed degradation mechanisms.

Abstract The effect of metal core on flame spread behavior over polyethylene (PE)-insulated electrical wire was experimentally investigated by varying applied AC voltage (VAC) and frequency (fAC). present experimental results with Cu-core were compared those conducted previously NiCr-core. Flame rate (FSR) for the baseline case no electric field larger than that Both FSR size appreciably influe...

In this paper, an engine piston ring coating comprising composite material of Fe3Al and Cr3C2 mixed powder was prepared by laser cladding onto carbon structural steel. The microstructure tribological properties the materials were investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission (TEM), wear tests. influence mecha...

Chromium carbide – nickel chromium powder Cr3C2-25wt.NiCr was plasma sprayed by a water-stabilized system WSP®. A series of experiments with variable feeding distance was carried out. Basic characterization of coatings was done by XRD, SEM and light microscopy plus image analysis. Microhardness was measured on polished cross sections. The main focus of investigation was on resistances against w...

The tribological properties of matrix and skeletal titanium carbonitride composites were studied in dry friction conditions air. Experiments on wetting the TiCN–Cr3C2 composite by nickel–chromium alloys copper using sessile drop method performed to choose composition ascertain whether samples could be produced impregnation porous skeleton. experiments showed that nickel its formed a low contact...