scholarly journals Experimental Study and Thermodynamic Analysis of High Temperature Interactions between Boron Carbide and Liquid Metals

Engineering ◽  
2014 ◽  
Vol 06 (13) ◽  
pp. 849-868 ◽  
Author(s):  
Michael Aizenshtein ◽  
Natalya Froumin ◽  
Nachum Frage
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Boron Carbide ◽  
Thermodynamic Analysis ◽  
Liquid Metals ◽  
Temperature Interactions

High Temperature Ionic Liquids Electrosynthesis of Mo2C Protective Coatings on Diamond, Boron Nitride, Silicon and Boron Carbide

2018 ◽  
Vol 69 (3) ◽  
pp. 544-548 ◽  
Author(s):  
Victor Malyshev ◽  
Angelina Gab ◽  
Dimitri Shakhnin ◽  
Cristina Donath ◽  
Elena Ionela Neacsu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
High Temperature ◽  
Boron Nitride ◽  
Boron Carbide ◽  
Thermodynamic Analysis ◽  
Electrochemical Behavior ◽  
Electrochemical Synthesis ◽  
Molybdenum Carbide ◽  
Protective Coatings ◽  
Ionic Melts

On the basis of the thermodynamic analysis of the reactions of dielectrics and semiconductors with ionic melts, the systems suitable for an electrochemical synthesis from high temperature ionic liquids of films consisting in molybdenum carbide on the surfaces of these materials were selected. Then, the study of their electrochemical behavior was performed.

Effect of High Temperature on Wear Behavior of Stir Cast Aluminium/Boron Carbide Composites

2020 ◽  
Vol 22 (4) ◽  
pp. 1031-1046
Author(s):  
X. Canute ◽  
M. C. Majumder
Keyword(s):  
High Temperature ◽  
Wear Rate ◽  
Boron Carbide ◽  
Wear Behavior ◽  
Base Alloy ◽  
Weight Fraction ◽  
Sliding Velocity ◽  
Wear Properties ◽  
High Temperature Wear ◽  
The Matrix

AbstractThe need for development of high temperature wear resistant composite materials with superior mechanical properties and tribological properties is increasing significantly. The high temperature wear properties of aluminium boron carbide composites was evaluated in this investigation. The effect of load, sliding velocity, temperature and reinforcement percentage on wear rate was determined by the pin heating method using pin heating arrangement. The size and structure of base alloy particles change considerably with an increase of boron carbide particles. The wettability and interface bonding between the matrix and reinforcement enhanced by the addition of potassium flurotitanate. ANOVA technique was used to study the effect of input parameters on wear rate. The investigation reveals that the load had higher significance than sliding velocity, temperature and weight fraction. The pin surface was studied with a high-resolution scanning electron microscope. Regression analysis revealed an extensive association between control parameters and response. The developed composites can be used in the production of automobile parts requiring high wear, frictional and thermal resistance.

Laboratory Experimental Study on New Polymer in Xinjiang Lukeqin High Temperature and High Salt Reservoir

2018 ◽  
Author(s):  
M. Wang ◽  
Q. Xiao ◽  
Y. Gou ◽  
F. Deng ◽  
B. Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
High Salt

scholarly journals The intimate relationship between structural relaxation and the energy landscape of monatomic liquid metals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Franz Demmel ◽  
Louis Hennet ◽  
Noel Jakse
Keyword(s):  
High Temperature ◽  
Velocity Field ◽  
Liquid State ◽  
Liquid Metals ◽  
Energy Landscape ◽  
Experimental Studies ◽  
Transport Parameter ◽  
Arrhenius Behavior ◽  
Liquid Aluminium ◽  
Potential Energy Landscape

AbstractThe characteristic property of a liquid, discriminating it from a solid, is its fluidity, which can be expressed by a velocity field. The reaction of the velocity field on forces is enshrined in the transport parameter viscosity. In contrast, a solid reacts to forces elastically through a displacement field, the particles are trapped in their potential minimum. The flow in a liquid needs enough thermal energy to overcome the changing potential barriers, which is supported through a continuous rearrangement of surrounding particles. Cooling a liquid will decrease the fluidity of a particle and the mobility of the neighbouring particles, resulting in an increase of the viscosity until the system comes to an arrest. This process with a concomitant slowing down of collective particle rearrangements might already start deep inside the liquid state. The idea of the potential energy landscape provides an attractive picture for these dramatic changes. However, despite the appealing idea there is a scarcity of quantitative assessments, in particular, when it comes to experimental studies. Here we present results on a monatomic liquid metal through a combination of ab initio molecular dynamics, neutron spectroscopy and inelastic x-ray scattering. We investigated the collective dynamics of liquid aluminium to reveal the changes in dynamics when the high temperature liquid is cooled towards solidification. The results demonstrate the main signatures of the energy landscape picture, a reduction in the internal atomic structural energy, a transition to a stretched relaxation process and a deviation from the high-temperature Arrhenius behavior of the relaxation time. All changes occur in the same temperature range at about $$1.4 \cdot T_{melting}$$ 1.4 · T melting , which can be regarded as the temperature when the liquid aluminium enters the landscape influenced phase and enters a more viscous liquid state towards solidification. The similarity in dynamics with other monatomic liquid metals suggests a universal dynamic crossover above the melting point.

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