Plasma methods of obtainment of multifunctional composite materials, dispersion-hardened by nanoparticles

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Sizonenko, O.N.^1 ; Grigoryev, E.G.^2 ; Zaichenko, A.D.^1 ; Pristash, N.S.^1 ; Torpakov, A.S.^1 ; Lipyan, Ye V.^1 ; Tregub, V.A.^1 ; Zholnin, A.G.^2 ; Yudin, A.V.^2 ; Kovalenko, A.A.^1

Institute of Pulse Processes and Technologies, NAS of Ukraine, Oktyabrski ave. 43-a, Mykolaiv

54018, Ukraine^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway, 31, Moscow

115409, Russia^2

关键词: Alternating current;    Consolidation methods;    Conventional methods;    High-voltage electric discharge;    Hydrocarbon liquids;    Mechanical impacts;    Multifunctional composites;    Ultrafine structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012048/pdf
DOI  :  10.1088/1757-899X/130/1/012048

来源: IOP

【 摘 要 】

The new approach in developed plasma methods consists in that dispersionhardening additives (TiC, TiB2in particular) are not mechanically added to powder mixture as additional component, as in conventional methods, but are instead synthesized during high voltage electric discharges (HVED) in disperse system "hydrocarbon liquid - powder"; preservation of ultrafine structure is ensured due to use of spark plasma sintering (SPS) as a consolidation method. HVED in disperse system "hydrocarbon liquid - powder" due to impact of plasma discharge channel, electromagnetic fields, shock waves mechanical impact, hydro flows and volume microcavitation leads to synthesis of nanocarbon, metal powders dispersion and synthesis of micro- (from 10-6to 10-7m) and nanosized (from 10-7to 10-9m) composite powders of hardening phases. SPS is the passage of pulsed current (superposition of direct and alternating current) through powder with the simultaneous mechanical compressing. The formation of plasma is initiated in gaseous phase that fills gaps between particles. SPS allows targeted control of grain growth rate and thus allows obtainment of multifunctional composite materials dispersion hardened by nanoparticles. Processes of HVED synthesis of micro- and nanosized powders of new compositions from elemental metal powders and their mixtures with the subsequent application of high-speed SPS of obtained powders create conditions for increase of strength (by 10 - 20%), hardness and wear-resistance (by 30 - 60%) of obtained materials.