The thermal conductivity of carbon - carbon fibre composites below 80 K

Nicholls, Christopher; Rosenberg, H. M.

doi:10.1016/0011-2275(84)90089-4

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…[5][6][7] Carbon fiber reinforced polymers (CFRPs) are a family of strong, lightweight composite materials consisting of a polymer, typically epoxy, impregnated with woven layers of carbon fiber. The actual carbon fiber consists of bundles of several thousand carbon filaments, each only 5 to 10 μm in diameter.…”

Section: Design and Constructionmentioning

confidence: 99%

“…9 The thermal conductivity of carbon fiber also degrades at cryogenic temperatures, but it remains two to three orders of magnitude larger at T = 1 K than other machinable, insulating materials such as nylon or Teflon. 7,9 We have designed and manufactured a coil mount that consists almost exclusively of carbon fiber and sapphire, with small amounts of 3M DP-420 epoxy and GE 7031 varnish used to fasten certain elements. The main design feature is the skeleton of sapphire in which machined carbon fiber blocks sit to firmly engage the coils.…”

Section: Design and Constructionmentioning

confidence: 99%

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Sub-Kelvin ac magnetic susceptometry

Schmidt

Silevitch

Woo

et al. 2013

Review of Scientific Instruments

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Designing an apparatus for experiments that operate deep into the milliKelvin regime requires a careful selection of materials and construction techniques, and often entails balancing mutually contradictory requirements. In the case of magnetic susceptibility measurements, this involves choosing materials that realize both high thermal conductivity for good heat sinking and low electrical conductivity for minimal eddy-current heating. A coil mounting system with a completely nonmetallic construction, achieved through the use of a sapphire skeleton and a machined carbon-fiber body, resolves this dilemma. This system permits the use of large ac magnetic field amplitudes at kHz frequencies and above, opening the door to studies of the nonlinear dynamics of a wide variety of magnetic systems that were previously inaccessible.

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Section: Design and Constructionmentioning

confidence: 99%

Section: Design and Constructionmentioning

confidence: 99%

Sub-Kelvin ac magnetic susceptometry

Schmidt

Silevitch

Woo

et al. 2013

Review of Scientific Instruments

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Note: Carbon fiber composite arrow shaft as cryogenic structural support material

Plesha

Tonita

Kycia

2018

Review of Scientific Instruments

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The thermal conductivity, electrical resistivity, and bending stiffness of a carbon fiber archery arrow shaft were measured in order to determine if it would be a good material to use as a structural support in a cryogenic environment. It shows promise because of its thin cross section and structural rigidity. The thermal conductivity of the material was measured from 0.1 K to 1 K to be κ(T)=8.8 × 10−5 T1.54Wcm K, which is on the order of other thermal insulating materials used at cryogenic temperatures. The electrical resistivity is 0.044 Ω cm at 0.2 K, and the bending stiffness is 243 N m2 at room temperature. The shafts were machined to reduce overall thermal conductance. The reduction in thermal resistivity was calculated, and the change in stiffness was measured after shafts were machined. The shafts were used to form a support structure for an adiabatic demagnetization refrigerator. The heat load was then calculated. The carbon fiber arrow shaft provides an outstanding, thermal insulating support structure.

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Hertzian Fracture, Kinetic Friction and the Mechanical Impact LOX Compatibility Testing of Polymers and Polymer Matrix Composites

Dean¹,

Gerzeski

2006

Journal of ASTM International

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A cascade of probabilistic mechanisms is proposed to better understand the 72 ft-lbs mechanical impact in liquid oxygen ignition threshold sensitivity testing of polymeric and polymer matrix composite materials. This model teams the well established and understood mechanisms of Hertzian fracture and kinetic friction. In conjunction they explain the mechanical fracturing of the specimen and the very rapid transformation of the test's mechanical energy into temperature rising heat energy. The model also provides the first explanation for the random probabilistic occurrence or nonoccurrence of ignitions in tested materials.

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The thermal conductivity of carbon - carbon fibre composites below 80 K

Cited by 3 publications

References 5 publications

Sub-Kelvin ac magnetic susceptometry

Sub-Kelvin ac magnetic susceptometry

Note: Carbon fiber composite arrow shaft as cryogenic structural support material

Hertzian Fracture, Kinetic Friction and the Mechanical Impact LOX Compatibility Testing of Polymers and Polymer Matrix Composites

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