Thermal expansion and volume change of crystals containing substitutional point imperfections

1970 ◽  
Vol 42 (2) ◽  
pp. 859-869 ◽  
Author(s):  
K. H. Timmesfeld ◽  
R. J. Elliott
Keyword(s):  
Thermal Expansion ◽  
Volume Change

FREE VOLUME CHANGE OF METALLIC GLASSES STUDIED BY THERMAL EXPANSION MEASUREMENTS

1980 ◽  
Vol 41 (C8) ◽  
pp. C8-875-C8-877
Author(s):  
E. Girt ◽  
P. Tomić ◽  
A. Kuršumović ◽  
T. Mihać-Kosanović
Keyword(s):  
Thermal Expansion ◽  
Free Volume ◽  
Volume Change ◽  
Metallic Glasses

A Note on the Volume Change of Tires During Warm-Up

1976 ◽  
Vol 4 (4) ◽  
pp. 252-255
Author(s):  
D. J. Schuring
Keyword(s):  
Thermal Expansion ◽  
Volume Change ◽  
Joule Effect ◽  
Warm Up ◽  
Initial Decrease

Abstract Increasing the temperature produces a decrease in tire volume. After longer times the volume tends to increase again. The initial decrease is attributed to the predominance of the Gough-Joule effect over thermal expansion and the delayed increase, to creep.

scholarly journals On the thermal consolidation of Boom clay

2000 ◽  
Vol 37 (2) ◽  
pp. 343-354 ◽  
Author(s):  
Pierre Delage ◽  
Nabil Sultan ◽  
Yu Jun Cui
Keyword(s):  
Thermal Expansion ◽  
Waste Disposal ◽  
Volume Change ◽  
Free Water ◽  
Radioactive Waste Disposal ◽  
Slow Heating ◽  
Intrinsic Permeability ◽  
Fast Heating ◽  
Boom Clay ◽  
Thermal Consolidation

When a mass of saturated clay is heated, as in the case of host soils surrounding nuclear waste disposal at great depth, the thermal expansion of the constituents generates excess pore pressures. The mass of clay is submitted to gradients of pore pressure and temperature, hydraulic and thermal flows, and changes in its mechanical properties. In this work, some of these aspects were experimentally studied in the case of Boom clay to help predict the response of the soil, in relation to investigations in the Belgian underground laboratory at Mol. Results of slow-heating tests with careful volume change measurements showed that a reasonable prediction of the thermal expansion of the clay-water system was obtained by using the thermal properties of free water. Despite the density of Boom clay, no significant effect of water adsorption was observed. The thermal consolidation of Boom clay was studied through fast-heating tests. A simple analysis shows that the hydraulic and thermal transfers are uncoupled. Experimental results from fast-heating tests showed that the consolidation coefficient does not change significantly with increased temperature, due to the opposite effect of increasing permeability and decreasing porosity. The changes of permeability with temperature were investigated by running constant head measurements at various temperatures. An indirect analysis, based on estimation of the coefficient of volume change mv, showed that the indirect method of estimating the permeability from consolidation tests should be considered carefully. Intrinsic permeability values were derived by considering the change of the viscosity of free water with temperature. A unique relationship between the intrinsic permeability and the porosity was observed, with no dependence on temperature, confirming that the flow involved in the permeability test only concerns free water.Key words: clays, thermal consolidation, adsorbed water, permeability, temperature effects, radioactive waste disposal.

Thermal expansion of corium prepared from UO2 and Zircaloy-2

2012 ◽  
Vol 1444 ◽  
Author(s):  
Shun Hirooka ◽  
Masatoshi Akashi ◽  
Teppei Uchida ◽  
Kyoichi Morimoto ◽  
Masato Kato
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Volume Change ◽  
Thermal Vibration ◽  
X Ray Diffraction ◽  
Volume Changes ◽  
X Ray ◽  
Content Ratio ◽  
Diffraction Patterns ◽  
Ar Gas

ABSTRACTIn this study, sintered pellets were prepared from Zircaloy-2 oxide and UO2 as a parameter of content ratio (Zr contents were 0, 24.3, 49.0, 73.4, and 97.9 at% in metal). The sintered pellets were heated in 5%H2/Ar gas. UO2 pellets underwent simple thermal expansion caused by thermal vibration while Zircaloy-2 oxide pellets underwent thermal expansion and volume change with phase transformation. Finally, the 24.3, 49.0, and 73.5 at%Zr-UO2 pellet specimens showed both phenomena. However, phase transformation temperatures were lower than that of Zircaloy-2 oxide, and volume changes were much smaller. X-ray diffraction patterns obtained after thermal expansion measurements showed that the 24.3 at%Zr-UO2 specimen contained tetragonal and cubic (Zr, U)O2 while the 73.5 at%Zr-UO2 specimen contained mainly monoclinic ZrO2.

Direct measurements of thermal expansion and the volume change upon melting for graphite

Carbon ◽  
2016 ◽  
Vol 100 ◽  
pp. 537-539 ◽  
Author(s):  
A.M. Kondratyev ◽  
V.N. Korobenko ◽  
A.D. Rakhel
Keyword(s):  
Thermal Expansion ◽  
Volume Change ◽  
Direct Measurements

Crystallization and Second-Order Transitions in Silicone Rubbers

1951 ◽  
Vol 24 (2) ◽  
pp. 366-373 ◽  
Author(s):  
C. E. Weir ◽  
W. H. Leser ◽  
L. A. Wood
Keyword(s):  
Thermal Expansion ◽  
Volume Change ◽  
Silicone Rubber ◽  
Low Temperatures ◽  
Linear Thermal Expansion ◽  
Second Order ◽  
Order Transition ◽  
General Electric ◽  
Second Order Transition ◽  
Silicone Rubbers

Abstract In the course of an investigation to determine which rubbers might be suitable for use at low temperatures, interferometric measurements of the length-temperature relationships of silicone rubbers have been made. Crystallization was found between −60° and −67° C in Dow-Corning Silastic X-6160 and in General Electric 9979G silicone rubber, the latter of which contains no filler. Crystallization between −75° and −85° C was found in Silastic 250. Melting occurred over a range of temperature above the temperature of crystallization. The volume change on crystallization varied from 2.0 to 7.8 per cent. No crystallization or melting phenomena were observed in Silastic X-6073 between −180° and +100° C. All types of silicone rubber exhibited a second-order transition at about −123° C, the lowest temperature at which such a transition has been observed in a polymer. The coefficient of linear thermal expansion of silicone rubbers containing no filler was found to be about 40×10−5/degree C between −35° and 0° C.

Microstructural and Microchemical Characterization of Nickel Sulfide Inclusions in Plate Glass

1991 ◽  
Vol 49 ◽  
pp. 962-963
Author(s):  
J. Cooper ◽  
O. Popoola ◽  
W. M. Kriven
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Glass Matrix ◽  
Nickel Sulfide ◽  
Plate Glass ◽  
Thermal Expansion Mismatch ◽  
Volume Increase ◽  
Β Phase ◽  
Microchemical Characterization

Nickel sulfide inclusions have been implicated in the spontaneous fracture of large windows of tempered plate glass. Two alternative explanations for the fracture-initiating behaviour of these inclusions have been proposed: (1) the volume increase which accompanies the α to β phase transformation in stoichiometric NiS, and (2) the thermal expansion mismatch between the nickel sulfide phases and the glass matrix. The microstructure and microchemistry of the small inclusions (80 to 250 μm spheres), needed to determine the cause of fracture, have not been well characterized hitherto. The aim of this communication is to report a detailed TEM and EDS study of the inclusions.

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