The thermal conductivity of compacted powder carbons and mixtures of carbon powders with uranium carbide particles

Carbon ◽  
1966 ◽  
Vol 4 (2) ◽  
pp. 167-176 ◽  
Author(s):  
R.P. Tye ◽  
Margaret J. Woodman
Keyword(s):  
Thermal Conductivity ◽  
Uranium Carbide ◽  
Carbide Particles

Thermal Conductivity of Composite Silicone Rubber Filled with Graphite / Silicone Carbide

2011 ◽  
Vol 221 ◽  
pp. 382-388 ◽  
Author(s):  
Yan He ◽  
Xue Sheng Wu ◽  
Zhen Chao Chen
Keyword(s):  
Thermal Conductivity ◽  
Silicone Rubber ◽  
Graphite Flake ◽  
Curing Agent ◽  
Liquid Form ◽  
Conductive Fillers ◽  
Silicone Carbide ◽  
Carbide Particles ◽  
Better Than ◽  
Thermal Conductivities

Graphite flakes and silicone carbide particles are used as heat conductive fillers added into methyl vinyl silicone rubber, and the effect of filler amount, filler shape and different curing agents (DCP, DBPMH) on the thermal conductivities of silicone rubber are investigated in this article. The results reveal that the thermal conductivities of composite silicone rubber will be increased with the increase of the amount of fillers. While the filling content surpasses a certain value, the thermal conductivity of composite increases obviously. The silicone rubber filled with graphite flake possesses a higher thermal conductivity than that filled with silicone carbide particles at relative high fillers content, but both of them are close to each other at relative low fillers content. Moreover, the thermal conductivities of composite silicone rubber filled with the powder form curing agent (DCP) are better than that of composite silicone rubber filled the liquid form curing agent (DBPMH).

scholarly journals Thermal Conductivity of Uranium Nitride and Carbide

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
B. Szpunar ◽  
J. A. Szpunar
Keyword(s):  
Thermal Conductivity ◽  
Electronic Structure ◽  
Alternative Fuels ◽  
Magnetic Moments ◽  
Quantitative Agreement ◽  
Uranium Carbide ◽  
Antiferromagnetic Ordering ◽  
Electronic Thermal Conductivity ◽  
Uranium Nitride ◽  
Quantum Espresso

We investigate the electronic thermal conductivity of alternative fuels like uranium nitride and uranium carbide. We evaluate the electronic contribution to the thermal conductivity, by combining first-principles quantum-mechanical calculations with semiclassical correlations. The electronic structure of UN and UC was calculated using Quantum Espresso code. The spin polarized calculations were performed for a ferromagnetic and antiferromagnetic ordering of magnetic moments on uranium lattice and magnetic moment in UC was lower than in UN due to stronger hybridization between 2p electrons of carbon and 5f electrons of uranium. The nonmagnetic electronic structure calculations were used as an input to BolzTrap code that was used to evaluate the electronic thermal conductivity. It is predicted that the thermal conductivity should increase with the temperature increase, but to get a quantitative agreement with the experiment at higher temperatures the interaction of electrons with phonons (and electron-electron scattering) needs to be included.

scholarly journals The Microstructure and Thermal Conductivity of Pressureless InfiltratedSiCp/AlComposites Containing Electroless Nickel Platings

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Aihua Zou ◽  
Xianliang Zhou ◽  
Xiaozhen Hua ◽  
Duosheng Li ◽  
Kaiyang Wu
Keyword(s):  
Thermal Conductivity ◽  
Three Dimensional ◽  
Electroless Nickel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uniform Coating ◽  
Video Microscope ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
Scanning Electron

A nickel (Ni) coating was deposited on the surface of silicon carbide particles (SiCp) through electroless plating and we characterized the morphology and phase structure of the coating and the pressureless infiltratedSiCp/Alcomposites. The effect of Ni coatings on the thermal conductivity of the composites was examined and analyzed with three-dimensional video microscope, scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction microscope (XRD), and finite-element. The results show that a continuous and uniform coating with a certain thickness (around 3.5 μm) can be formed on the surface ofSiCp. With the addition of the Ni layer, there are some intermetallics Ni3Al but no interfacial carbide Al4C3, which improves the wettability and the thermal conductivity of the composites. The experiments and simulations both show that Ni coatings do not substantially decrease the overall thermal conductivity of the composite, although the thermal conductivity of Ni itself is lower than Al and SiC by a factor of 1.

Thermal Conductivity and Mechanical Properties of Silicone Rubber Filled with Different Particle Sized SiC

2009 ◽  
Vol 87-88 ◽  
pp. 137-142 ◽  
Author(s):  
Yan He ◽  
Zhen Chao Chen ◽  
Lian Xiang Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Silicone Rubber ◽  
Filling Fraction ◽  
Large Particles ◽  
Conductive Fillers ◽  
Negative Impacts ◽  
Silicone Carbide ◽  
Carbide Particles ◽  
Thermal Conductivities

Micro- and nano- silicone carbide particles are used as heat conductive fillers of methyl vinyl silicone rubber, and the influence of filler amount, particle size and the surface treatment of filler on the thermal conductivities and mechanical properties of silicone rubber are studied. The results show that the thermal conductivities of silicone rubber are improved, but the mechanical properties are worse with the increase of the amount of fillers. The composite filled with smaller sized silicone carbide has a better thermal conductivity than that filled with large particles in a relatively high filling fraction, and composite filled with different sized silicone carbide has different mechanical properties at the same filling amount. Treatment of fillers with coupling agent (KH-560, A-171) has active impacts on the thermal conductivity but negative impacts on mechanical properties of the filled silicone rubber.

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