Zbigniew Siemiątkowski

TL;DR: In this paper, the results of gallium nitride crystallization by ammonothermal method are presented and structural and optical properties of the obtained materials are studied and compared, and it is shown that a much more effective multiplication process of high quality GaN can be launched using a combination of the ammonothermal and HVPE methods.

TL;DR: In this article, the research results o nanostructural composite ZrO2-WC obtained with modified Field Assisted Sintering is described, where hot pressing processes were performed at different sintering temperatures using mixtures of different proportions of tungsten monocarbide, such as 10,wt, 20,wt% and 30,wt%.

TL;DR: In this paper, a comprehensive characterization of the near surface formed during the interrupted high-speed dry ceramic milling of IN718 was performed using light imaging, SEM/EDX, TEM and nano-hardness methods.

TL;DR: Values of the electric component of electromagnetic field intensification determined with the ESM 140 dosimeter during the flights of four aircrafts and the maximum value registered by the dosimeter was E = 3.307 V/m for GSM 1800 frequencies.

TL;DR: In this paper, the authors investigated the fracture toughness of alumina-tungsten carbide nanocomposite and found that high heating rates and a short sintering time enabled the process to be completed in 12 min, saving energy and time.