Extraction of compact ceramic electrode materials based on the Ti‒B‒Fe system modified by nanosized AlN particles by SHS extrusion

2020 ◽  
pp. 51-55
Author(s):  
A. V. Bolotskaya ◽  
M. V. Mikheev
Keyword(s):  
Phase Composition ◽  
Aluminum Nitride ◽  
Electrode Materials ◽  
Combustion Characteristics ◽  
Nanosized Particles ◽  
Shs Extrusion ◽  
Effect Of Additives ◽  
Initial Charge

Compact ceramic electrode materials based on the Ti‒B‒Fe system modified with nanosized particles of aluminum nitride (up to 15 wt. %) were obtained by SHS extrusion. The effect of additives on the combustion characteristics of the studied system, as well as on the structure and phase composition of the obtained materials, is studied. The addition of aluminum nitride increases the content of boride and nitride phases in the final product. It was found that the introduction of modifying nanosized particles of aluminum nitride into the initial charge leads to the grinding of grains of boride and nitride phases, which together increases the microhardness by 10 %, in comparison with unmodified samples.

Preparation by SHS-extrusion method of compact ceramic materials based on the Ti‒B system, modified with nanosized Si3N4 particles

2021 ◽  
pp. 132-135
Author(s):  
A. V. Bolotskaya ◽  
M. V. Mikheev ◽  
P. M. Bazhin ◽  
A. M. Stolin ◽  
Yu. V. Titova
Keyword(s):  
Phase Composition ◽  
Crack Resistance ◽  
Titanium Diboride ◽  
Mechanical Characteristics ◽  
Ceramic Materials ◽  
Shs Extrusion ◽  
Structure Phase ◽  
Initial Charge ◽  
Extrusion Method ◽  
Physical And Mechanical Characteristics

Compact ceramic materials based on the Ti‒B system modified with 5 wt. % of nanosized Si3N4 particles. The results of studies of the structure, phase composition, and physical and mechanical characteristics of the materials obtained are presented. It is shown that the addition of Si3N4 promotes the formation of new phases, in particular, titanium diboride and nitride in the final product. It was found that the introduction of modifying nanosized Si3N4 particles into the initial charge leads to an increase in hardness and microhardness by 15‒20 %, as well as to an increase in crack resistance by 1,5 times in comparison with unmodified samples.

The Effect of Additives Including Metakaolin on the Freeze Resistance of Concrete

2016 ◽  
Vol 843 ◽  
pp. 263-268
Author(s):  
A.A. Kirsanova ◽  
V. Thiery ◽  
L.Ya. Kramar
Keyword(s):  
Phase Composition ◽  
Cement Stone ◽  
Optimum Amount ◽  
Freeze Resistance ◽  
Optimal Amount ◽  
Degree Of Hydration ◽  
Effect Of Additives ◽  
Research Studies

With the help of research studies on the freeze resistance of concrete with complex additives containing metakaolin it is found that its optimum amount with microsilica and plasticizing agents can provide concrete with high freeze resistance of F11000 and more. The use of metakaolin – superplasticizing admixture contributes to a slight increase of freeze resistance of concrete only due to the consolidation of its structure as a result of increasing the degree of hydration of main minerals of concrete С3S and β-С2S under the influence of metakaolin. It is proved that the optimal amount of metakaolin together with superplasticizing admixture helps to form the phase composition of cement stone from highly basic hydrosilicates and stable hydroaluminates. The use of overdosed metakaolin leads to appearance of a great number of metastable hydroaluminates in the cement stone which makes it inefficient for the production of freeze-proof concrete.

Preparation and electrochemical properties of lead-steel layered composite electrode materials for adiponitrile production

2021 ◽  
Author(s):  
Yang Xu ◽  
Zhaohui Han ◽  
Peixian Zhu ◽  
Shenggang Zhou
Keyword(s):  
Phase Composition ◽  
Electrochemical Properties ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Layered Composite ◽  
Reduction Ratio ◽  
Rolling Reduction ◽  
Composite Electrodes ◽  
Roll Bonding ◽  
Bonding Technology

Abstract In this paper, Pb-63%Sn alloy was selected as an intermediate layer to plate on Q235 steel by the hot dipping method, and then the hot-dipped steel and the lead plate were welded by roll-bonding technology to prepare the lead-steel layered composite electrode materials. Scanning electron microscopy (SEM), Energy dispersion spectrum (EDS) and X-ray diffraction (XRD) were used to characterize the interface morphology and phase composition of samples, and the interface formation mechanism was also discussed. The electrochemical properties of the lead-steel layered composite electrode under different rolling reduction ratio were studied by linear sweep voltammetry (LSV), Tafel polarization curves (Tafel) and weight-loss method. Subsequently, the prepared lead-steel layered composite electrodes were applied to the industrial production experiment for adiponitrile. The results indicated that lead-steel layered composite electrodes with excellent electrochemical properties were successfully prepared by hot dipping and roll-bonding technology. Analysis of microstructure and phase composition showed that the metallurgical bond of hot-dipped steel and lead plate could be achieved by the process of rolling, and the fracture feature was ductile fracture. And the conductivity, electrocatalytic activity and corrosion resistant of lead-steel layered composite electrode material were improved with the increase of rolling reduction ratio. The industrial production results showed that, compared with the traditional Pb-0.6%Ag electrode, the prepared lead-steel layered composite electrode at the rolling reduction ratio of 40% exhibited the best industrial performance, the current efficiency was increased by 4.94%, the average cell voltage was reduced by 19.4%, and the adiponectin yield was increased by 4.86%.

Morphology, Phase Composition, and Properties of Nanosized Particles of Gallium Ferrite, Synthesized by Chemical Combustion

2021 ◽  
Vol 66 (6) ◽  
pp. 1095-1099
Author(s):  
N. I. Snegirev ◽  
S. S. Starchikov ◽  
I. S. Lyubutin ◽  
Yu. L. Ogarkova ◽  
M. V. Lyubutina ◽  
...  
Keyword(s):  
Phase Composition ◽  
Nanosized Particles

Tailoring of phase composition and morphology of TiO2-based electrode materials for lithium-ion batteries

2013 ◽  
Vol 231 ◽  
pp. 23-28 ◽  
Author(s):  
M. Fehse ◽  
F. Fischer ◽  
C. Tessier ◽  
L. Stievano ◽  
L. Monconduit
Keyword(s):  
Phase Composition ◽  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Lithium Ion
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