scholarly journals Experimental study of the transport properties of Nd-Fe-B and Sm-Co magnets

2019 ◽  
Vol 196 ◽  
pp. 00048
Author(s):  
Dmitrii Samoshkin ◽  
Alibek Agazhanov
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Experimental Study ◽  
Thermal Diffusivity ◽  
Laser Flash ◽  
Hard Magnetic Materials ◽  
Laser Flash Technique ◽  
Flash Technique ◽  
Critical Amplitudes ◽  
Main Components

The article adduces new reliable experimental data on the thermal conductivity and the thermal diffusivity of hard magnetic materials of brands N35M, N35H, N35SH, as well as YX18, YX24 and YXG22, YXG30 with main components represented by the crystalline phases of Nd2Fe14B, SmCo5 and Sm2Co17 type, respectively. The temperature range from 293 to 773…1273 K has been investigated by laser flash technique with an error of 3—4%. The reference tables of the thermal diffusivity and thermal conductivity coefficients have been developed. The character of the thermal diffusivity changes near the Curie point has been determined. The critical indices and the critical amplitudes have been defined.

scholarly journals Thermophysical properties of NP2 brand nickel

2021 ◽  
Vol 2119 (1) ◽  
pp. 012135
Author(s):  
D A Samoshkin ◽  
A Sh Agazhanov ◽  
S V Stankus
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Diffusivity ◽  
Thermophysical Properties ◽  
Magnetic Phase ◽  
Laser Flash ◽  
Scanning Calorimetry ◽  
Reference Table ◽  
Laser Flash Technique ◽  
Flash Technique

Abstract The heat capacity and the thermal diffusivity of NP2 brand nickel were investigated in the temperature interval 296–1000…1375 K of the solid-state, including the region of the magnetic phase transformation. Measurements were carried out on samples from one initial ingot by laser flash technique and method of differential scanning calorimetry using LFA-427 and DSC 404 F1 setups, respectively. The thermal conductivity was calculated based on the measured thermophysical properties. The estimated errors of the obtained results were 2–4%, 3–5%, and 2–3% for thermal diffusivity, thermal conductivity, and heat capacity, respectively. For investigated thermophysical properties the fitting equations and the reference table have been received.

Assessment of Thermal Barrier Coatings by Plasma Deposition

1997 ◽  
Author(s):  
K.S. Ravichandran ◽  
K. An ◽  
R. Taylor
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
Thermal Barrier Coatings ◽  
Laser Flash ◽  
Thermal Barrier ◽  
Conductivity Data ◽  
Barrier Coatings ◽  
Laser Flash Technique ◽  
Flash Technique

Abstract Thermal conductivity is an important design parameter for thermal barrier coatings. Accurate thermal conductivity data is therefore required to ensure proper design and reliability of gas turbine blades. In the present research, thermal conductivities of Al2O3 and 8wt.% Y2O3 stabilized ZrO2 (8YSZ) coatings, made by air plasma spray, were determined from the measurements of thermal diffusivity and specific heat as a function of temperature. Thermal diffusivity was determined by the laser flash technique. Specific heat was determined by a Differential Scanning Calorimeter (DSC). Detailed analyses of the results indicate that the thermal conductivity is sensitive to coating density (porosity), interfaces between splats as well as the interface between the coating and the substrate. Additionally, thermal conductivity evaluations of these coatings were also influenced by the accuracy and relevance of the data on bulk monolithic materials. Further, analyses of sensitivity of the laser flash technique to variations in the coating and the substrate parameters, for the coatings evaluated in this study, were also performed. The results are discussed in the context of coating characteristics, reference conductivity data for dense materials and the sensitivity of the measurement method to coating parameters.

scholarly journals Thermal diffusivity of polymers by the laser flash technique

2005 ◽  
Vol 24 (5) ◽  
pp. 628-634 ◽  
Author(s):  
Wilson Nunes dos Santos ◽  
Paul Mummery ◽  
Andrew Wallwork
Keyword(s):  
Thermal Diffusivity ◽  
Laser Flash ◽  
Laser Flash Technique ◽  
Flash Technique

Determination of thermal conductivity of silica dioxide Tarkosil T-50 nanopowder by laser flash technique

2016 ◽  
Vol 25 (2) ◽  
pp. 174-181 ◽  
Author(s):  
A. V. Nomoev ◽  
S. P. Bardakhanov ◽  
V. V. Syzrantsev ◽  
V. Ts. Lygdenov
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Laser Flash Technique ◽  
Flash Technique ◽  
Silica Dioxide

Spatial distribution of thermal conductivity of diamond wafers as measured by laser flash technique

1998 ◽  
Author(s):  
Victor G. Ralchenko ◽  
A. Vlasov ◽  
Igor I. Vlasov ◽  
Boris V. Zubov ◽  
Alexander P. Nikitin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Spatial Distribution ◽  
Laser Flash ◽  
Laser Flash Technique ◽  
Flash Technique

Thermal Diffusivity by the Laser Flash Technique

2002 ◽  
Author(s):  
Raymond E. Taylor ◽  
Jozef Gembarovic ◽  
Kosta D. Maglic
Keyword(s):  
Thermal Diffusivity ◽  
Laser Flash ◽  
Laser Flash Technique ◽  
Flash Technique

Thermal Diffusivity Measurement of Pure Te, (Hg1−x Cdx)1−yTey and (Hg1−xZnx)1−yTey

1994 ◽  
Vol 299 ◽  
Author(s):  
Hossein Maleki ◽  
Lawrence R. Holland
Keyword(s):  
Thermal Diffusivity ◽  
Melting Point ◽  
Wide Temperature Range ◽  
Laser Flash ◽  
Thermal Diffusivity Measurement ◽  
Temperature Range ◽  
Diffusivity Measurement ◽  
Laser Flash Technique ◽  
Flash Technique ◽  
Thermal Diffusivities

AbstractThe thermal diffusivities of (Hg1−xCdx)1−yTey and (Hg1−xZnx)1−yTeywith 0.55 ≤ y ≤ 1.0 and 0.0125 ≤ x ≤ 0.05465 and of pure Te are measured over a wide temperature range by the laser flash technique. The diffusivity of near pseudobinary Hg1−xCdxTe solids decrease more rapidly with temperature approaching the melting point than pseudobinary solids previously reported. The solid diffusivity for x=0.02817 is 0.83 mm2/s at 371°C, decreasing to 0.22 mm2/s at 614°C. The diffusivity of Te rich (Hg1−xCdx)1−yTey melt increases with x and with temperature. The melt diffusivity for x=0.03934 is 0.91 mm2/s at 485°C, increasing to 4.93 mm2/s at 851°C. For Te rich (Hg1−xZnx)1−yTey melt with x=0.0125 and y=0.7944 there appears to be a minimum diffusivity of about 2.6 mm2/s near 700°C. The thermal diffusivity of pure Te solid is 0.97 mm2/s at 300°C and decreases to 0.64 mm2/s at 439°C. The melt diffusivity is 1.52 mm2/s at 486°C, increasing to 3.48 mm2/s at 584°C.

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