Development of iron-base composite materials with high thermal conductivity for DEMO

2014 ◽  
Vol 1645 ◽  
Author(s):  
H. Homma ◽  
N. Hashimoto ◽  
S. Ohnuki
Keyword(s):  
Composite Materials ◽  
Thermal Diffusivity ◽  
High Heat ◽  
High Heat Flux ◽  
Plasma Sintering ◽  
The Matrix ◽  
Critical Issues ◽  
High Thermal Diffusivity ◽  
Copper Composite ◽  
Thermal Diffusivities

ABSTRACTOne of the critical issues for development of the nuclear fusion demonstration reactor (DEMO) is the high heat flux on heat-resistant equipments, especially the blanket and divertor. Materials of such equipments require relatively high thermal conductivities. In this study, we developed iron-based composite materials with carbon nanotube (CNT) and copper, which have high thermal diffusivities, by means of Hot Pressing (HP) and Spark Plasma Sintering (SPS).The thermal diffusivity in the iron/CNT composites was not high enough compared with that of pure iron, while iron/copper composite showed a relatively high thermal diffusivity in the joining conditions. One of the reasons not to be improved thermal diffusivity could be non-mono-dispersion of CNT by the formation of carbides in the matrix.

scholarly journals Particularities of structure formation of aluminum-copper composite materials manufactured by casting technology

2020 ◽  
pp. 116-121
Author(s):  
V. A. Kalinichenko ◽  
A. S. Kalinichenko ◽  
S. V. Grigoriev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structure Formation ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Alloying Elements ◽  
Casting Technology ◽  
The Matrix ◽  
Reinforcing Material ◽  
Copper Composite

To create friction pairs operating in severe working conditions, composite materials are now increasingly used. Composite materials obtained with the use of casting technologies are of interest due to the possibility to manufacture wide range of compositions at low price compared to powder metallurgy. Despite the fact that many composite materials have been sufficiently studied, it is of interest to develop new areas of application and give them the properties required by the consumer. In the present work the composite materials on the basis of silumin reinforced with copper granules were considered. Attention was paid to the interaction between the matrix alloy and the reinforcing phase material as determining the properties of the composite material. The analysis of distribution of the basic alloying elements in volume of composite material and also in zones of the interphases interaction is carried out. The analysis of the possibility of obtaining a strong interphase zone of contact between the reinforcing component and the matrix material without significant dissolution of the reinforcing material is carried out.

scholarly journals High heat flux erosion of carbon fibre composite materials in the TEXTOR tokamak

1998 ◽  
Vol 258-263 ◽  
pp. 757-763
Author(s):  
H Bolt ◽  
T Scholz ◽  
J Boedo ◽  
K.H Finken ◽  
A Hassanein
Keyword(s):  
Heat Flux ◽  
Composite Materials ◽  
Carbon Fibre ◽  
Fibre Composite ◽  
High Heat ◽  
High Heat Flux ◽  
Carbon Fibre Composite

scholarly journals The Thermal Diffusivity of Glass Sieves: II. Gas-saturated Frits

2021 ◽  
Vol 42 (6) ◽  
Author(s):  
Ulf Hammerschmidt ◽  
Muhammad Abid
Keyword(s):  
Thermal Diffusivity ◽  
Borosilicate Glass ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Expanded Uncertainty ◽  
The Matrix ◽  
Thermal Diffusivities ◽  
Transient Hot Bridge

AbstractThe thermal diffusivity of gas-saturated glass sieves (frits) of porosities between 20 % and 48 % is presented as measured at room temperature and ambient pressure. The saturants cover a range in thermal diffusivity from 20.63 × 10–6 m2⋅s−1 to 172 × 10–6 m2⋅s−1. The experiments were carried out using a transient hot-bridge instrument of an expanded uncertainty of 5 % to 10 %. It turned out that all measured thermal diffusivities of the gas-saturated frits (1) are smaller than that of the borosilicate glass the frits are made from and (2) are completely different from the thermal diffusivities of the liquid-saturated frits. Both these discrepancies can be attributed to characteristic properties of the matrix and not directly to the saturants. The first divergence results from thermal tortuosity that lengthens the pathway of heat through the matrix, whereas the second arises from dissolved He that enhances the transport of heat through the matrix.

Thermal Conductivities of Cs-M-O (M= Mo or U) Ternary Compounds

2009 ◽  
Vol 1215 ◽  
Author(s):  
Kazuyuki Tokushima ◽  
Kosuke Tanaka ◽  
Ken Kurosaki ◽  
Hiromichi Gima ◽  
Hiroaki Muta ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Diffusivity ◽  
Room Temperature ◽  
Laser Flash ◽  
Flash Method ◽  
Ternary Compounds ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Thermal Diffusivities ◽  
Thermal Conductivities

AbstractThermal conductivities of Cs-M-O (M= Mo or U) ternary compounds, observed in the pellet-cladding gap region and in the pellet periphery in irradiated oxide fuels with high oxygen potentials, were investigated. Bulk samples of Cs2MoO4and Cs2UO4were prepared by hot pressing or spark plasma sintering, and their thermal diffusivities were measured by the laser flash method from room temperature to 823 K for Cs2MoO4and to 900 K for Cs2UO4. The thermal conductivities were evaluated from the thermal diffusivity and bulk density, and the specific heat capacity values available in the literature. The thermal conductivities of Cs2MoO4and Cs2UO4were quite low compared with UO2(e.g. 0.5 Wm−1K−1at 800 K for Cs2MoO4).

scholarly journals Numerical and experimental determination of the minimum and maximum measuring times for the hot wire parallel technique

Cerâmica ◽  
2003 ◽  
Vol 49 (309) ◽  
pp. 29-35 ◽  
Author(s):  
W. N. dos Santos ◽  
R. Gregório
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Ceramic Materials ◽  
Time Interval ◽  
Hot Wire ◽  
High Thermal Diffusivity ◽  
Different Dimensions ◽  
Thermal Diffusivities ◽  
Parallel Technique

The hot wire technique is considered to be an effective and accurate means of determining the thermal conductivity of ceramic materials. However, specifically for materials of high thermal diffusivity, the appropriate time interval to be considered in calculations is a decisive factor for getting accurate and consistent results. In this work, a numerical simulation model is proposed with the aim of determining the minimum and maximum measuring time for the hot wire parallel technique. The temperature profile generated by this model is in excellent agreement with that one experimentally obtained by this technique, where thermal conductivity, thermal diffusivity and specific heat are simultaneously determined from the same experimental temperature transient. Eighteen different specimens of refractory materials and polymers, with thermal diffusivities ranging from 1x10-7 to 70x10-7 m²/s, in shape of rectangular parallelepipeds, and with different dimensions were employed in the experimental programme. An empirical equation relating minimum and maximum measuring times and the thermal diffusivity of the sample is also obtained.

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