scholarly journals Processing, Stability and High-Temperature Properties of Transition Metal Silicide-Refractory Oxide Composites for Electrical Applications

2018 ◽  
Author(s):  
Gunes Alp Yakaboylu
Keyword(s):  
High Temperature ◽  
Transition Metal ◽  
Refractory Oxide ◽  
Metal Silicide ◽  
High Temperature Properties ◽  
Transition Metal Silicide ◽  
Processing Stability ◽  
Oxide Composites

Stability, Mechanical Properties and Electronic Properties of X3Si (X=V, Nb, Cr, Mo and W) from First Principles Calculations

2018 ◽  
Vol 913 ◽  
pp. 596-606
Author(s):  
He Wei ◽  
Yin Li Chen ◽  
Lan Su
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Transition Metal ◽  
Electronic Properties ◽  
Density Functional ◽  
Metal Silicide ◽  
Electronic Density ◽  
Temperature Oxidation ◽  
Transition Metal Silicide ◽  
Metastable Structure

The transition metal silicide X3Si (X = V, Nb, Cr, Mo and W) was characterized by its low density, high melting point, high temperature hardness, high temperature resistance to wear, high temperature oxidation resistance and corrosion resistance in this paper. For the fields such as aerospace, gas turbine etc, with the application of a new generation of high temperature structural materials, transition metal silicide will be one of their candidate materials. The stability, crystal structure, mechanical properties, electronic properties, Debye temperature and hardness of X3Si(X=V, Nb, Cr, Mo and W) compounds were calculated employing electronic density functional theory (DFT) and the generalized gradient approximation (GGA). The results show that the remaining silicides have stable structures except that W3Si is a metastable structure in X3Si compounds. Based on the stress-strain theory, the bulk modulus, shear modulus, Young's modulus and Poisson's ratio of Cr3Si and Mo3Si were estimated by Voigt-Reuss-Hill method: 248.7 GPa, 158.9 GPa, 393.0 GPa, 0.24 and 249.2 GPa, 134.6 GPa, 342.1 GPa, 0.27. According to the state density (DOS) analysis, we can see that the valence band of X3Si compound is a combination of covalent bond and metal bond. The temperature of Debye of Cr3Si (645.1 K) in X3Si compound is the highest. The hardness of these silicon compounds is evaluated using a semi empirical hardness theory and the result shows that Cr3Si (10.96 GPa) is the hardest compound among them.

scholarly journals Room temperature synthesis of transition metal silicide-conducting polymer micro-composites for thermoelectric applications

2017 ◽  
Vol 225 ◽  
pp. 55-63 ◽  
Author(s):  
Ujwala Ail ◽  
Zia Ullah Khan ◽  
Hjalmar Granberg ◽  
Fredrik Berthold ◽  
Rajasekar Parasuraman ◽  
...  
Keyword(s):  
Transition Metal ◽  
Conducting Polymer ◽  
Room Temperature ◽  
Metal Silicide ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Transition Metal Silicide

scholarly journals Transition metal silicide surface grafting by multiple functional groups and green optimization by mechanochemistry

2019 ◽  
Vol 21 (46) ◽  
pp. 25720-25727
Author(s):  
Maxime Godfroy ◽  
Mahmoud Khalil ◽  
Claude Niebel ◽  
Thibaut Jarrosson ◽  
Dominique Foix ◽  
...  
Keyword(s):  
Transition Metal ◽  
Functional Groups ◽  
Coupling Agents ◽  
Surface Grafting ◽  
Metal Silicide ◽  
Transition Metal Silicide

The functionalization by different coupling agents enabled to modify the properties of the surface of CrSi2 nanocrystallites.

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