Effect of aluminum nitride nanoparticles on structure, phase composition and properties of materials based on TiB/Ti obtained by SHS-extrusion method

Bolotskaya, A. V.; Михеев, М. В.; Бажин, П. М.; Столин, А. М.; Titova, Yu. V.

doi:10.30791/1028-978x-2019-1-73-80

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“…Получение с минимальной пористостью МКМ на основе боридов титана реализуется методом СВСэкструзии, благодаря сочетанию процессов горения и высокотемпературного сдвигового деформирования. Полученные этим методом компактные МКМ обладают низкой пористостью не более 1-5 % [11,12]. Ранее был проведен ряд работ по получению компактных длинномерных материалов на основе системы TiB / Ti при их модифицировании наноразмерными порошками AlN марки СВС-Аз [13].…”

Section: Introductionunclassified

The effect of aluminum nitride nanoparticles on the structure, phase composition and properties of materials of the Ti-B-Fe system obtained by SHS-extrusion

et al. 2020

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The SHS-extrusion method, which combines the combustion processes in the mode of self-propagating high-temperature synthesis (SHS) and the subsequent high temperature shear deformation of the combustion products, was used to obtain metal-ceramic composite materials based on titanium boride with an iron matrix modified by additives of nanoaluminum nitride of grade SHS-Az. It was shown that small additions of nanoscale aluminum nitride powder (3 and 5 wt.%) to the initial mixture of the Ti-B-Fe system had a significant effect on the temperature and combustion rate of the system: the combustion rate decreased from 16 to 9 mm / s and the combustion temperature from 1830-1900°C to 1730-1780°C. The results of X-ray phase analysis showed that the modifying AlN nanopowder decomposed during the SHS process and interacted with titanium and iron matrix forming additional phases of TiN and AlFe 3. This is the main cause of the reduction of the temperature and combustion rate during synthesis. A refinement of the grains of titanium diboride in the modified samples from 0.5-2.5 μm to 0.1-1.5 μm was observed using a scanning electron microscope. Microhardness measurements showed that the obtained compact metal-ceramic materials modified with the nanoscale AlN powder had 10 % higher microhardness values compared to samples without additives.

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Section: Introductionunclassified