Topic
Thermal expansion
About: Thermal expansion is a research topic. Over the lifetime, 21040 publications have been published within this topic receiving 349407 citations. The topic is also known as: heat expansion.
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TL;DR: In this article, the volume change on melting, ΔVm, the molar volume of fluid, Vf, and the fluid thermal expansion coefficient, α f [≠ ( 1 V f ( ϖV f ϖT ) p ], were measured along the melting curve from 1.3 to 31°K at pressures up to 3500 kg/cm2.
103 citations
TL;DR: In this paper, the velocity of sound in ethanol has been measured in the temperature range between 273.15 and 333.15 K and at pressures up to 280 MPa using the phase comparison pulse-echo method with two reflectors, which has been described previously.
Abstract: The velocity of sound in ethanol has been measured in the temperature range between 273.15 and 333.15 K and at pressures up to 280 MPa using the phase comparison pulse-echo method with two reflectors, which has been described previously. The density, isothermal compressibility, isobaric thermal expansion and the specific heat at constant pressure of ethanol have been evaluated from the measured sound velocity, using an improved method of computation.
103 citations
TL;DR: In this paper, the thermal and mechanical properties of hot-pressed bulk -Yb2Si2O7 were investigated using a combination of first-principles calculations and experimental investigations.
Abstract: The thermal and mechanical properties of -Yb2Si2O7 were investigated using a combination of first-principles calculations and experimental investigations. Theoretically, anisotropic chemical bonding and elastic properties, weak interatomic (010) and (001) planes in the crystal structure, damage tolerance, and low thermal conductivity are predicted. Experimentally, preferred orientation, superior mechanical properties, and damage tolerant behavior for hot-pressed bulk -Yb2Si2O7 are approved. Slipping along the weakly bonded {010}, {001}, or {100} planes, grain delamination, buckling, and kinking of nanolaminated grains are identified as main mechanisms for damage tolerance. The anisotropic linear thermal expansion coefficients (CTEs) are: (a)=(3.57 +/- 0.18)x10(-6)K(-1), (b)=(2.49 +/- 0.14)x10(6)K(-1), and (c)=(1.48 +/- 0.22)x10(-6)K(-1) (673-1273K). A low thermal conductivity of similar to 2.1W (mK)(-1) at 1273K has been confirmed. The unique combination of these properties endow it a potential candidate for thermal barrier coating (TBC)/environmental barrier coating of silicon-based ceramics.
103 citations
TL;DR: In this article, the authors used the gas expansion method to measure the density of liquid krypton at 11 temperatures from 120 to 220°K and at pressures up to 3680 atm.
Abstract: The gas expansion method has been used to measure the density of liquid krypton at 11 temperatures from 120 to 220°K and at pressures up to 3680 atm. The results have been fitted to the Strobridge equation, which has been used to estimate, at regular intervals of pressure and temperature, the following properties: density, isothermal compressibility, thermal expansion coefficient, thermal pressure coefficient, configurational internal energy, and entropy relative to the saturated liquid. The equation of state results, together with estimated values of the third virial coefficient and published values of vapor pressure, second virial coefficient, and sound velocity in the liquid phase, have been used to estimate the following properties of the saturated liquid: enthalpy of vaporization, configurational internal energy, isothermal compressibility, thermal expansion coefficient, thermal pressure coefficient, adiabatic compressibility, and specific heats. The linear dependence of configurational internal energy on density, over a wide range of pressures and temperatures, suggests a relatively simple form for a hard sphere equation of state for monatomic liquids. The evaluation of constants for such an equation is briefly discussed.
103 citations
TL;DR: In this article, the phases of HMX and their transitions were investigated by thermal analysis using X-ray diffraction, and the thermal expansion coefficients and the colume changes at the transitions were extracted from the diffraction series.
Abstract: The phases of HMX and their transitions were investigated by thermal analysis using X-ray diffraction. Series of diffraction pattern were measured, while the samples were heated and cooled. The thermal expansion coefficients and the colume changes at the transitions were extracted from the diffraction series. A contraction of β-HMX was found before changing into δ-HMX resulting in a high volume difference during the transition. On cooling, the reconversion of the high temperature phase requires days. It is further slowed down by decomposition products, which are formed at temperatures beyond 490 K. The final reconversion results in mixtures of α-and βHMX.
The mechanical sensitivities and the buring rates of the HMX phase were determined. The high sensitivity of δ-HMX against impact together with its slow reconversion creates handling risks when the HMX is exposed to temperatures above 440 K.
103 citations