Самораспространяющийся высокотемпературный синтез марки ПА4 в количестве 5 % в СВСсмесь позво ляет на порядок уменьшить размер синтезируе мых частиц карбидной фазы TiС с 2-4 до 0,17-0,35 мкм, т. е. достичь уровня ультрадисперсной армирующей фазы в литом композите Al-10%TiС. А замена 30 % металлического титана в СВСсмеси на галоидную титансодержащую соль Na 2 TiF 6 дает возможность синтезировать частицы TiC разме ром менее 100 нм, т. е. достичь уровня наноди сперсной армирующей фазы в этом композите.
Работа выполнена при поддержке Министерства образования и науки РФ в рамках ФЦП «Исследования и разработки по приоритетнымнаправлениям развития научно-технологического комплекса России на 2007-2013 годы» (государственный контракт № 14.513.11.0042).
Pilot-scale series of cast Ti-Al, Ti-Al-Nb, (Ni, Co, Mn)Al x , Ni-Cr-Al-Si-C, and Co-V-Al-Si-C alloys were produced by thermit-type SHS under high gravity for their potential use as heat-resistant materials, master alloys, precursors for catalysts, etc.
The effect of PTFE, continuous boron, and tungsten fibers on the combustion behavior and strength of reactive Ni–Al compacts was examined in this study. The introduction of continuous fibers into Ni–Al compacts according to the developed scheme was found to increase the flexural strength from 12 to 120 MPa. Heat treatment (HT), leading to chemical interaction of the starting components, increases the strength of compacts at temperatures not exceeding 550 °C. The combination of reinforcement and HT significantly increases the strength without reducing reactivity. Experimental results showed that strength and combustion rate increase with the reduction in PTFE to 1 wt % in Ni–Al compacts. A favorable effect of the addition of PTFE from 5 to 10 wt % on the reduction of the threshold for the shock-wave initiation of reactions in Ni–Al was established. The obtained results can be used to produce reactive materials with high mechanical and energy characteristics.
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