Thermal Conductivity of Reinforced Plastics at Cryogenic Temperatures

1965 ◽  
pp. 163-170 ◽  
Author(s):  
J. Hertz ◽  
J. F. Haskins
Keyword(s):  
Thermal Conductivity ◽  
Cryogenic Temperatures ◽  
Reinforced Plastics

scholarly journals Improved Copper–Epoxy Adhesion by Laser Micro- and Nano-Structuring of Copper Surface for Thermal Applications

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1721
Author(s):  
Mario Mora ◽  
Hippolyte Amaveda ◽  
Luis Porta-Velilla ◽  
Germán F. de la Fuente ◽  
Elena Martínez ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Bonding Strength ◽  
Copper Surface ◽  
Heat Sinks ◽  
Electrical Insulation ◽  
Cryogenic Temperatures ◽  
Shear Tests ◽  
Patterned Structures ◽  
Different Temperatures ◽  
Mechanical Tensile

The objective of this work is the enhancement of metal-to-metal bonding to provide high thermal conductivity together with electrical insulation, to be used as heat sinks at room and cryogenic temperatures. High thermal conductive metal (copper) and epoxy resin (Stycast 2850FT) were used in this study, with the latter also providing the required electrical insulation. The copper surface was irradiated with laser to induce micro- and nano-patterned structures that result in an improvement of the adhesion between the epoxy and the copper. Thus, copper-to-copper bonding strength was characterized by means of mechanical tensile shear tests. The effect of the laser processing on the thermal conductivity properties of the Cu/epoxy/Cu joint at different temperatures, from 10 to 300 K, is also reported. Using adequate laser parameters, it is possible to obtain high bonding strength values limited by cohesive epoxy fracture, together with good thermal conductivity at ambient and cryogenic temperatures.

Some results of investigation of the thermal conductivity of fiber glass-reinforced plastics

1975 ◽  
Vol 29 (1) ◽  
pp. 870-872 ◽  
Author(s):  
Yu. G. Narozhnyi ◽  
Yu. V. Polezhaev ◽  
V. N. Kirillov
Keyword(s):  
Thermal Conductivity ◽  
Fiber Glass ◽  
Reinforced Plastics

Thermal Conductivity of Frozen Soil at Cryogenic Temperatures

1995 ◽  
pp. 655-661
Author(s):  
J. J. Cloessner ◽  
R. F. Barron
Keyword(s):  
Thermal Conductivity ◽  
Frozen Soil ◽  
Cryogenic Temperatures

Measuring Thermal Conductivity of Insulators at Cryogenic Temperatures

2000 ◽  
pp. 1919-1924 ◽  
Author(s):  
B. P. M. Helvensteijn ◽  
L. J. Salerno ◽  
P. R. Roach ◽  
P. Kittel ◽  
S. M. White
Keyword(s):  
Thermal Conductivity ◽  
Cryogenic Temperatures

Correlation between the strength and thermal conductivity of glass-reinforced plastics

1972 ◽  
Vol 5 (4) ◽  
pp. 660-662
Author(s):  
V. F. Zinchenko
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Plastics

Thermal conductivity of reinforced plastics

Composites ◽  
1970 ◽  
Vol 1 (4) ◽  
pp. 256 ◽  
Author(s):  
D.M. Sundstrom ◽  
S.Y. Chen
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Plastics

Prediction of Extent of Heat Affected Zone in Laser Grooving of Unidirectional Fiber-Reinforced Plastics

1998 ◽  
Vol 120 (4) ◽  
pp. 321-327 ◽  
Author(s):  
C. T. Pan ◽  
H. Hocheng
Keyword(s):  
Thermal Conductivity ◽  
Heat Source ◽  
Heat Affected Zone ◽  
Fiber Orientation ◽  
Thermal Damage ◽  
Laser Energy ◽  
Fiber Axis ◽  
Unidirectional Fiber ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

Laser has been widely used in various industrial applications including machining. However, in shaping operation of composite material after curing, thermal damage associated with laser energy can be produced. It leads to poor assembly tolerance and long-term performance deterioration. The current research investigates the anisotropic formation of the heat affected zone (HAZ) in unidirectional fiber-reinforced plastics induced by laser grooving. Preliminary analytical and experimental analysis reveal that the laser energy per unit length and fiber orientation-dependent thermal conductivity primarliy determine the induced thermal damage. The extent of HAZ is estimated by the isotherm of the matrix char temperature. Heat conduction is maximum along the fibers, and the HAZ shape is thus affected by the beam scanning direction relative to fiber orientation. The study investigates the grooving of laminated unidirectional carbon/epoxy, which demonstrates clear thermal damage in 90 degree (i.e., perpendicular grooving), 60 degree, 30 degree, and 0 degree (i.e., parallel grooving) relative to the fiber axis. A theoretical analysis based on moving point heat source is adopted to determine the extent of thermal damage in correlation with process parameters and material properties. Mirror Image Method is used for specimen of finite thickness. Considerations of temperature-dependence of thermal conductivity and the emmerged heat source further improve the prediction of HAZ. While HAZ in grooving along the principal material axes can be solved analytically, conductivity ellipsoid and finite difference can calculate the extent of HAZ induced by grooving in any direction relative to fiber axis.

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