NDLI: The radiation change in the coefficient of linear thermal expansion of carbon materials

Content Provider	Springer Nature Link
Author	Virgil'ev, Yu. S.
Copyright Year	1997
Abstract	Hence, the thermal coefficient of volume expansion of graphite is related exponentially to the height of the crystals and the density of the material and depends on the specific surface of the structure and micropores. The coefficient of linear thermal expansion of graphite is inversely proportional to the dynamic modulus of elasticity. The negative change in α of graphite on neutron irradiation: changes nonmonotonically with the neutron fluence and the radiation temperature — initially it increases, reaches a maximum, then falls and again increases; is inversely proportional to the power 1/3 of its initial value, to the rate of steady radiation creep and the neutron fluence; is determined by the degree of perfection of the crystal structure and the concentration of spherolites (carboids) of the elements of the microstructure. Their increase facilitates a fall in α below its initial value; it does not recover completely on thermal annealing to 2300 K.The relative change in α of carbon-carbon composition materials when irradiated to a neutron fluence of 3·1020 cm−2 and a temperature from 320 K to 2100 K does not exceed 10%. The complex nature of the radiation change makes it difficult to calculate the value of α, and hence it has to be determined in experiments up to the resource dose.
Starting Page	414
Ending Page	421
Page Count	8
File Format	PDF
ISSN	10634258
Journal	Atomic Energy
Volume Number	82
Issue Number	6
e-ISSN	15738205
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1997-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nuclear Chemistry Nuclear Physics, Heavy Ions, Hadrons Nuclear Engineering
Content Type	Text
Resource Type	Article
Subject	Nuclear Energy and Engineering

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