ОСОБЛИВОСТІ ВИМІРЮВАННЯ ЕЛЕКТРИЧНОГО ОПОРУ ВІЛЬНОСПЕЧЕНИХ КОМПОЗИТІВ AlN–50% SiC

Vasyl Chasnyk; Dmytro Chasnyk; Oksana Kaidash

Vasyl Chasnyk State Enterprise Research Institute ORION, 8 A, A. Tsedika Srt., Kyiv, 03057, Ukraine https://orcid.org/0000-0003-2057-0492
Dmytro Chasnyk Ukrainian Research Institute of Special Equipment and Forensic Science of the Security Service of Ukraine (ISEE SSU), 3 M. Vasylenka Str., Kyiv, 03113, Ukraine https://orcid.org/0000-0002-3608-3122
Oksana Kaidash Bakul Institute for Superhard Materials National Academy of Sciences of Ukraine https://orcid.org/0000-0002-8879-3425

Keywords: surface and bulk electrical resistance, aluminum nitride, silicon carbide, bulk absorber of microwave radiation, Q factor, surface electrical resistance measurement method, devices for measuring electrical resistance

Abstract

The electrical resistance of pressureless sintered ceramic AlN–50% SiC composites, suitable for use as bulk microwave radiation absorbers, has been investigated. The bulk and surface electrical resistance of the composites were measured with a digital multimeter UT 30D and a digital megohmmeter BM 500A. For this purpose, a two-probe method for measuring the surface resistance of small-sized samples Æ4.2×1.0 mm from the composite was developed. A set of devices was manufactured for applying four pairs of contact pads Æ0.6 mm to the surface of the disk and its reliable fixation during the measurement of the surface electrical resistance. For three groups of disks with different quality factors Q = 44, 55 and 70, the average values of the surface resistance determined are: 136, 212 and 300 kΩ, and the corresponding average values of the bulk resistance are: 7.0; 9.2 and 11.8 kΩ. Analysis of the experimental data set revealed a relationship between surface and bulk electrical resistance: higher bulk resistance corresponds to higher surface resistance, with surface resistance being 19.4–25.4 times higher than bulk resistance

Author Biographies

Vasyl Chasnyk, State Enterprise Research Institute ORION, 8 A, A. Tsedika Srt., Kyiv, 03057, Ukraine

кандидат технічних наук, знаний спеціаліст у галузі ваккумної електроніки

Oksana Kaidash, Bakul Institute for Superhard Materials National Academy of Sciences of Ukraine

The main area of research is the creation of advanced (high-tech) ceramics with improved physico-mechanical, physico-chemical and functional characteristics due to the establishment of structural sintering mechanisms of refractory carbides and nitrides with heterodesmic interatomic bonds, patterns of formation of their microstructures. Specialist in powder metallurgy and has experience in working with a number of technologies: sintering, hot pressing, slip casting, hot extrusion of ceramic powders.

Leading researcher of dep. 6 ISM NANU, Dr. Sci. (Material Science),

https://orcid.org/0000–0002–8879–3425; SCOPUS ID: 6603071054; h-index: 4

The degree PhD (1992). PhD thesis : "Development of corrosion-resistant cermets based on titanium nitride with increased stability in biologically active medium" 05.02.01 - Material Science
Defence of thesis 05 December 1991 at the Special Academic Council of the Bakul Institute of Superhard Materials of the National Academy of Sciences of Ukraine (Kyiv).

Dr. Sci. (2019): “Scientific fundamentals of formation of structure and properties during sintering from submicron refractory carbides and nitrides of advanced ceramics for the mechanical engineering” 05.02.01 - Material Science. Defence of thesis 22 November 2018 at the Special Academic Council of the Bakul Institute of Superhard Materials of the National Academy of Sciences of Ukraine (Kyiv).

FEATURES THE ELECTRICAL RESISTANCE OF MEASURING OF PRESSURELESS SINTERED AlN–50% SiC COMPOSITES

Abstract

Author Biographies