Abstract. In this paper, the finite element method (FEM) and experiment were adopted to evaluate the thermal performance and luminous flux of gas-cooled light-emitting diode (LED) filament lamp. The results show that the maximal temperature of the lamp with standard A55 glass bulb with four 1W LED elements can be limited under 140 °C. Air, nitrogen, helium are investigated as a gas filling of LED light bulb. The gas filling has a significant effect on the light flux and can change light flux of up to 15 percent. Characteristics of those gases also are object of this work. The effect of pressure on the thermal conductivity of gases inside the sealed glass bulb is estimated. This article discusses the results and provides recommendations for manufacturers of such lamps.
Polyaluminosilicates with different chemical structures have been synthesized. They have been experimentally studied and a priori estimated. Dielectric ceramic layers have been obtained by means of 3D aerosol printing and studied with the use of synthesized polyaluminosilicates and highly dispersed powder of Al2O3 ceramic filler.
A composite material based on polyaluminosilicate and highly dispersed filler powders of AlN and Al2O3 has been synthesized by means of the sol-gel synthesis. The pH effect on the Zeta potential of highly dispersed filler powders of AlN and Al2O3 has been investigated. The effect of the Zeta potential of filler powders on the sol polyaluminosilicate stability has been studied. Ceramic coatings for printed circuit boards have been obtained by 3D aerosol printing.
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