Artykuły w czasopismach: „Thermal Expansion Coefficient”

1

Haverland, Gordon Wayne. "Thermal expansion coefficient". JOM 49, nr 8 (sierpień 1997): 6. http://dx.doi.org/10.1007/bf02914380.

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Oku, Tatsuo, i Shinichi Baba. "Coefficient of Thermal Expansion". TANSO 2002, nr 202 (2002): 90–95. http://dx.doi.org/10.7209/tanso.2002.90.

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Sugimoto, Hideki, Ken Imamura, Kazuki Sakami, Katsuhiro Inomata i Eiji Nakanishi. "Transparent Acryl‐Alumina Nano‐Hybrid Materials with Low Coefficient of Thermal Expansion". Sen'i Gakkaishi 71, nr 11 (2015): 333–38. http://dx.doi.org/10.2115/fiber.71.333.

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Yang, Rui, Qing Yang i Bin Niu. "Design and study on the tailorable directional thermal expansion of dual-material planar metamaterial". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, nr 3 (7.11.2019): 837–46. http://dx.doi.org/10.1177/0954406219884973.

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Current studies on tailoring the coefficient of thermal expansion of metamaterials focused on either complex bending-dominated lattice or the stretching-dominated lattice which transforms the spaces of triangle and tetrahedron. This paper proposes a kind of dual-material rectangular cell of tailorable thermal expansion, which reduces the complexities of design, calculation, and manufacture of lattice materials. The theoretical derivation using the matrix displacement method is adopted to study the thermal expansion properties of rectangular cell in the direction of height, the analytical expressions of coefficient of thermal expansion and optimization model are used to design the sizes of rectangular cell, and experimental verification is carried out. It is found that the middle cell of lattice had the same thermal expansion law as that of the unit cell. The rectangular cells of negative coefficient of thermal expansion −7 ppm/℃, zero coefficient of thermal expansion, and large positive coefficient of thermal expansion 36.2 ppm/℃ in the direction of height were realized, respectively. The consistency of theory, simulation, and experiment verifies that rectangular lattice material made of two kinds of common materials with a different coefficient of thermal expansions can achieve the design of coefficient of thermal expansion in the direction of height by choosing different material distribution and geometric parameters.

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Miyazawa, S. "Coefficient of Thermal Expansion of Concrete". Concrete Journal 56, nr 5 (2018): 368–72. http://dx.doi.org/10.3151/coj.56.5_368.

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6

Roy, R., D. K. Agrawal i H. A. McKinstry. "Very Low Thermal Expansion Coefficient Materials". Annual Review of Materials Science 19, nr 1 (sierpień 1989): 59–81. http://dx.doi.org/10.1146/annurev.ms.19.080189.000423.

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Takeda, Jun, Yukio Yasui, Hisashi Sasaki i Masatoshi Sato. "Thermal Expansion Coefficient of BaCo1-xNixS2". Journal of the Physical Society of Japan 66, nr 6 (15.06.1997): 1718–22. http://dx.doi.org/10.1143/jpsj.66.1718.

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Talwar, D. N., i Joseph C. Sherbondy. "Thermal expansion coefficient of 3C–SiC". Applied Physics Letters 67, nr 22 (27.11.1995): 3301–3. http://dx.doi.org/10.1063/1.115227.

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9

Trumper, Ricardo, i Moshe Gelbman. "Measurement of a thermal expansion coefficient". Physics Teacher 35, nr 7 (październik 1997): 437–38. http://dx.doi.org/10.1119/1.2344750.

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Low, D., T. Sumii i M. Swain. "Thermal expansion coefficient of titanium casting". Journal of Oral Rehabilitation 28, nr 3 (marzec 2001): 239–42. http://dx.doi.org/10.1046/j.1365-2842.2001.00664.x.

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Russell, A. M., B. A. Cook, J. L. Harringa i T. L. Lewis. "Coefficient of thermal expansion of AlMgB14". Scripta Materialia 46, nr 9 (maj 2002): 629–33. http://dx.doi.org/10.1016/s1359-6462(02)00034-9.

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Low, D., T. Sumii i M. Swain. "Thermal expansion coefficient of titanium casting". Journal of Oral Rehabilitation 28, nr 3 (marzec 2001): 239–42. http://dx.doi.org/10.1111/j.1365-2842.2001.00664.x.

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Kumar, V., i B. S. R. Sastry. "Thermal Expansion Coefficient of Binary Semiconductors". Crystal Research and Technology 36, nr 6 (lipiec 2001): 565–69. http://dx.doi.org/10.1002/1521-4079(200107)36:6<565::aid-crat565>3.0.co;2-f.

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Burns, S. J., i S. P. Burns. "Is there a layer deep in the Earth that uncouples heat from mechanical work?" Solid Earth Discussions 6, nr 1 (11.02.2014): 487–509. http://dx.doi.org/10.5194/sed-6-487-2014.

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Abstract. The thermal expansion coefficient is presented as the coupling between heat energy and mechanical work. It is shown that when heat and work are uncoupled then very unusual material properties occurs: for example, acoustic p waves are not damped and heat is not generated from mechanical motion. It is found that at pressures defined by the bulk modulus divided by the Anderson–Grüneisen parameter, then the thermal expansion coefficient approaches zero in linear-elastic models. Very large pressures always reduce thermal expansion coefficients; the importance of a very small or even negative thermal expansion coefficient is discussed in relation to physical processes deep in the core and mantle of Earth. Models of the thermal expansion coefficients based on interatomic potentials which are always relegated to isometric conditions preclude any changes in volume due to temperature changes. However, it is known that the pressures in the Earth are large enough to effectively reduce thermal expansion coefficients to near zero which decouples heat from mechanical work.

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HAYAKAWA, Yuko, i Toshihiro ISOBE. "Negative Thermal Expansion Materials and Control of Thermal Expansion Coefficient of Composites". Journal of the Japan Society of Colour Material 90, nr 4 (2017): 131–37. http://dx.doi.org/10.4011/shikizai.90.131.

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Lim, Teik-Cheng. "Coefficient of thermal expansion of stacked auxetic and negative thermal expansion laminates". physica status solidi (b) 248, nr 1 (16.08.2010): 140–47. http://dx.doi.org/10.1002/pssb.200983970.

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A. Khachatrian, A. "Calculation of the linear coefficient of thermal expansion of multi-element, single-phase metal alloys from the first principles". Uspihi materialoznavstva 2021, nr 2 (1.06.2021): 10–18. http://dx.doi.org/10.15407/materials2021.02.010.

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One of the possible ways to calculate the coefficient of thermal expansion is a method based on determining the dependence of the total energy of the electron-ion system on the parameters of the crystal lattice at different temperatures. There is a relationship between the calculated values of the linear coefficients of thermal expansion and the melting point of the material. For metals and multi-element single-phase alloys, the dependence of the function V = α·Tmax on the parameter T/Tmax (α — the linear coefficients of thermal expansion, Tmax — melting point of the material) is obtained from the first principles, which has the same form for all single-phase multi-element metal alloys and is presented analytically. Using the method of pseudopotential and quasiharmonic approximation, the linear coefficients of thermal expansion of multi-element metal alloys are calculated. The temperature dependence of the coefficient of thermal expansion, after approximating the results of the computational experiment, is presented in analytical form. The results were compared with known tabular data. To confirm the reliability of the model, the calculation was performed for a number of pure metals. The consistency of the calculated and experimental data on the coefficient of thermal expansion of single-phase alloys calculated from the first principles is observed. There is a relationship between the calculated values of the linear coefficients of thermal expansion and the melting point of the material. For metals and multi-element single-phase alloys, the dependence of the function V = α·Tmax on the parameter T/ Tmax (α — the linear coefficients of thermal expansion, Tmax — melting point of the material) is obtained from the first principles, which has the same form for all single-phase multi-element metal alloys and is presented analytically. Keywords: Electron-ion system energy, interatomic interaction potential, force constants, quasiharmonic approximation, coefficient of thermal expansion.

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18

Liang, Rui-sheng, i Feng-chao Liu. "Measurement of thermal expansion coefficient of substrate GGG and its epitaxial layer YIG". Powder Diffraction 14, nr 1 (marzec 1999): 2–4. http://dx.doi.org/10.1017/s0885715600010216.

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A new method is used in measuring the linear thermal expansion coefficients in composite consisting of a substrate Gd3Ga2Ga3O12 (GGG) and its epitaxial layer Y3Fe2Fe3O12 (YIG) within the temperature range 13.88 °C–32.50 °C. The results show that the thermal expansion coefficient of GGG in composite is larger than that of the GGG in single crystal; the thermal expansion coefficient of thick film YIG is also larger than that of thin film. The results also show that the thermal expansion coefficient of a composite consisting of film and its substrate can be measured by using a new method.

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19

Lu, Tong, Song Ling Liu, Yong Hao Sun, Wei-Hua Wang i Ming-Xiang Pan. "A Free-Volume Model for Thermal Expansion of Metallic Glass". Chinese Physics Letters 39, nr 3 (1.03.2022): 036401. http://dx.doi.org/10.1088/0256-307x/39/3/036401.

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Many mechanical, thermal and transport behaviors of polymers and metallic glasses are interpreted by the free-volume model, whereas their applications on thermal expansion behaviors of glasses is rarely seen. Metallic glass has a range of glassy states depending on cooling rate, making their coefficients of thermal expansion vary with the glassy states. Anharmonicity in the interatomic potential is often used to explain different coefficients of thermal expansion in crystalline metals or in different metallic-glass compositions. However, it is unclear how to quantify the change of anharmonicity in the various states of metallic glass of the same composition and to connect it with coefficient of thermal expansion. In the present work, isothermal annealing is applied, and the dimensional changes are measured for La62Al14Cu11.7Ag2.3Ni5Co5 and Zr52.5Cu17.9Ni14.6Al10Ti5 metallic glasses, from which changes in density and the coefficients of thermal expansion of the specimens are both recorded. The coefficients of thermal expansion linearly decrease with densification reflecting the role of free volume in thermal expansion. Free volume is found to have not only volume but also entity with an effective coefficient of thermal expansion similar to that of gases. Therefore, the local regions containing free volume inside the metallic glass are gas-like instead of liquid-like in terms of thermal expansion behaviors.

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Agar, J. G., N. R. Morgenstern i J. D. Scott. "Thermal expansion and pore pressure generation in oil sands". Canadian Geotechnical Journal 23, nr 3 (1.08.1986): 327–33. http://dx.doi.org/10.1139/t86-046.

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The prediction of stress changes and deformations arising from ground heating requires the coupled solution of the heat transfer and consolidation equations. Heat consolidation as a class of problems is distinct from other thermally induced consolidation problems involving processes such as frost heave and thaw consolidation in that it involves heating to elevated temperatures well above normal ground temperatures. Two of the important parameters required in analyses of heat consolidation problems are thermal expansion coefficients and a coefficient of thermal pore pressure generation.Relationships describing thermal expansion behaviour and thermal pore pressure generation in oil sands are presented. Both drained and undrained thermal expansion coefficients for Athabasca oil sand were determined by means of heating experiments in the temperature range 20–300 °C. The thermal pore pressure generation coefficient was evaluated in undrained heating experiments under constant total confining stresses and under constant effective confining stresses. The equipment and experimental methods developed during this study are appropriate for determination of thermal expansion and pore pressure generation properties of oil sands and other unconsolidated geologic materials. Key words: thermal expansion, oil sand, tar sand, thermal pore pressure generation, heat consolidation, thermal consolidation, coefficient of thermal expansion, thermal stresses, ground heating, thermally enhanced oil recovery, thermoelasticity, undrained heating.

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21

Shi, Xiaolong, Mohammad Kazem Hassanzadeh Aghdam i Reza Ansari. "Effect of aluminum carbide interphase on the thermomechanical behavior of carbon nanotube/aluminum nanocomposites". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, nr 9 (16.08.2018): 1843–53. http://dx.doi.org/10.1177/1464420718794716.

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The objective of this work is to investigate the coefficient of thermal expansion of carbon nanotube reinforced aluminum matrix nanocomposites in which aluminum carbide (Al4C3) interphase formed due to chemical interaction between the carbon nanotube and aluminum matrix is included. To this end, the micromechanical finite element method along with a representative volume element, which incorporates, carbon nanotube, interphase, and aluminum matrix is employed. The emphasis is mainly placed on the effect of Al4C3 interphase on the coefficient of thermal expansion of aluminum nanocomposites with random microstructures. The effects of interphase thickness, carbon nanotube diameter, and volume fraction on the thermomechanical response of aluminum nanocomposite are discussed. The results reveal that the effect of Al4C3 interphase on the coefficient of thermal expansion of the aluminum nanocomposites becomes more significant with (i) increasing the coefficient of thermal expansion volume fraction, (ii) decreasing the coefficient of thermal expansion diameter, and (iii) increasing the interphase thickness. It is clearly observed that the coefficient of thermal expansion varies nonlinearly with the carbon nanotube diameter; however, it decreases linearly as the carbon nanotube volume fraction increases. Furthermore, the axial and transverse coefficient of thermal expansions of aligned continuous and discontinuous carbon nanotube-reinforced aluminum nanocomposites with Al4C3 interphase are predicted. Also, the presented finite element method results are compared with the available experiment in the literature, rule of mixture, and concentric cylinder model results.

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22

Zahmatkesh, Iman. "On the suitability of the volume-averaging approximation for the description of thermal expansion coefficient of nanofluids". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, nr 15 (9.12.2014): 2835–41. http://dx.doi.org/10.1177/0954406214563735.

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Currently, volume-averaging approximation is in common use for the description of thermal expansion coefficient of nanofluids in terms of expansion coefficients of their constituents. The accuracy of this method is not, however, so clear since it ignores the dependence of density on temperature in the prediction of thermal expansion coefficient that may not be true in natural convection circumstances. In the current contribution, attention is focused to clarify how predictions of flow and thermal fields as well as heat transfer and entropy generation characteristics during natural convection of nanofluids may be influenced if one adopts the volume-averaging approximation for the description of thermal expansion coefficient. For this purpose, a porous enclosure saturated with several water-based nanofluids is simulated and results of the volume-averaged thermal expansion coefficient are compared with those of a recent correlation that takes into account the dependence of density on temperature.

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23

Tran, Nam H., Kevin D. Hall i Mainey James. "Coefficient of Thermal Expansion of Concrete Materials". Transportation Research Record: Journal of the Transportation Research Board 2087, nr 1 (styczeń 2008): 51–56. http://dx.doi.org/10.3141/2087-06.

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Smith, James T., i Susan L. Tighe. "Recycled Concrete Aggregate Coefficient of Thermal Expansion". Transportation Research Record: Journal of the Transportation Research Board 2113, nr 1 (styczeń 2009): 53–61. http://dx.doi.org/10.3141/2113-07.

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Jimenez, F., B. Jimenez, S. Ramos i J. Del Cerro. "Thermal expansion coefficient of latgs single crystals". Ferroelectrics 79, nr 1 (1.03.1988): 241–44. http://dx.doi.org/10.1080/00150198808229441.

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Jin, Hong Mei, i Ping Wu. "First principles calculation of thermal expansion coefficient". Journal of Alloys and Compounds 343, nr 1-2 (wrzesień 2002): 71–76. http://dx.doi.org/10.1016/s0925-8388(02)00309-2.

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Lehmann, Jochen K. "Determining the thermal expansion coefficient of gases". Journal of Chemical Education 69, nr 11 (listopad 1992): 943. http://dx.doi.org/10.1021/ed069p943.

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Hayashi, Hideko, Mieko Watanabe i Hideaki Inaba. "Measurement of thermal expansion coefficient of LaCrO3". Thermochimica Acta 359, nr 1 (sierpień 2000): 77–85. http://dx.doi.org/10.1016/s0040-6031(00)00507-4.

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Inbanathan, S. S. R., K. Moorthy i G. Balasubramanian. "Measurement and Demonstration of Thermal Expansion Coefficient". Physics Teacher 45, nr 9 (grudzień 2007): 566–67. http://dx.doi.org/10.1119/1.2809151.

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Marques, F. C., R. G. Lacerda, A. Champi, V. Stolojan, D. C. Cox i S. R. P. Silva. "Thermal expansion coefficient of hydrogenated amorphous carbon". Applied Physics Letters 83, nr 15 (13.10.2003): 3099–101. http://dx.doi.org/10.1063/1.1619557.

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Грабов, В. М., В. А. Комаров, Е. В. Демидов, А. В. Суслов i М. В. Суслов. "Гальваномагнитные свойства тонких пленок Bi-=SUB=-95-=/SUB=-Sb-=SUB=-5-=/SUB=- на подложках с различным температурным расширением". Письма в журнал технической физики 44, nr 11 (2018): 71. http://dx.doi.org/10.21883/pjtf.2018.11.46199.17268.

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AbstractResults of an investigation of galvanomagnetic properties of Bi_95Sb_5 block thin films on substrates with different coefficients of thermal expansion covered with polyimide are presented. The difference between thermal expansions of the film material and the substrate was found to have a strong effect on the films’ galvanomagnetic properties. Analysis of the properties of the films using the two-band model showed that the concentration and mobility of the charge carriers in the Bi_95Sb_5 films are related to the coefficient of thermal expansion of the substrate material.

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Yue, Donghua, i Liming Wei. "Twisted Fibers Can Have an Adjustable Thermal Expansion". Proceedings 2, nr 8 (13.06.2018): 456. http://dx.doi.org/10.3390/icem18-05341.

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In this paper, a device with high accuracy capacitive sensor (with the error of 0.1 micrometer) is constructed to measure the axial thermal expansion coefficent of the twisted carbon fibers and yarns of Kevlar. A theoretical model based on the thermal elasticity and the geometrical features of the twisted structure is also presented to predict the axial expansion coefficient. It is found that the twist angle, diameter and pitch have remarkable influences on the axial thermal expansion coefficients of the twisted carbon fibers and Kevlar strands, and the calculated results are in good agreement with experimental data. We found that, with the increase of the twist angle, the absolute value of the axial thermal expansion coefficient increases. For the Kevlar samples, the expansion coefficient will grow by about 46% when the twist angle increases from 0 to 25 degrees, while the carbon fiber samples will grow by about 72% when the twist angle increases from 0 to 35 degrees. The experimental measurements and the model calculations reveal important properties of the thermal expansion in the twisted structures. Most notably, the expansion of the strand during heating or cooling can be zero when the twist angle is around β = arcsin(αL/αT)^1/2, where β denotes twist angle of the strand and αL, αT are the longitute and the transverse thermal expansion coefficient of the strand, respectively. According to the present experiments and analyses, a method to control the axial thermal expansion coefficient of this new kind of twisted structure is proposed. Moreover, the mechanism of this tunable thermal expansion is discussed. Based on the model, a method that can be used to rectify the thermal expansion properties of the twist structures is established. This may be a new way of fabricating zero expansion composite materials in the future.

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Zhu, Kai, Dao Yuan Yang, Juan Wu i Rui Zhang. "Synthesis of Cordierite with Low Thermal Expansion Coefficient". Advanced Materials Research 105-106 (kwiecień 2010): 802–4. http://dx.doi.org/10.4028/www.scientific.net/amr.105-106.802.

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Cordierite is an excellent material with good thermal shock resistance and used at high temperature for its low thermal expansion coefficient. Cordierite ceramics were prepared by using talc, alumina and kaolin clay as starting materials. The thermal expansion coefficient, phase composition and microstructure were studied and the results showed that: in order to get samples with low thermal expansion coefficient, the optimum chemical composition was a little rich in Al2O3 compared with the theoretical composition, the optimum sintering temperature was 1350°C, and adding 10% starch as pore-forming agent could effectively decreased the thermal expansion coefficient of the samples even to 0.8×10-6/°C. The samples contained majority of cordierite phase, with trace mullite and glass, the acicular cordierite crystals in samples developed very well and there were 10% starch powder used as pore-forming agent in formula. All these were the reasons to decrease the thermal expansion coefficient of cordierite material.

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Liu, Xie Quan, Xin Hua Ni, Shu Qin Zhang i Wan Heng He. "Thermal Expansion Coefficient of Ni Base Alloy Composite Coating Containing Spheroidal Ceramic Grains". Applied Mechanics and Materials 44-47 (grudzień 2010): 2148–51. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2148.

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Ni base alloy composite coating containing spheroidal ceramic grains can be fabricated by a vacuum fusion sintering method. Composite coating was mainly composed of Ni base alloy and spheroidal ceramic grains with random orientation. The three-phase model is used to determine the thermal expansion coefficient of the composite coating. First, Eshebly-Mori-Tanaka method was used to determine thermal disturbance strain in two-phase cell aroused thermal inconsistency. Then, average thermal strain in the two-phase cell aroused by thermal inconsistency is gained by the means of volume equilibration. The two-phase cell is transverse isotropy and has two independent thermal expansion coefficients. Finely, based on mean strain of Ni base alloy ceramic composite coating containing spheroidal ceramic grains, the effective thermal expansion coefficient of the composite coating is obtained by considering random orientation of two-phase cells. Ni base alloy composite coating containing spheroidal ceramic grains is isotropy and has one independent thermal expansion coefficient.

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Xiao, Zhuo Hao, An Xian Lu i Fei Lu. "Relationship between the Thermal Expansion Coefficient and the Composition for R₂O-MO-Al₂O₃-SiO₂ System Glass". Advanced Materials Research 11-12 (luty 2006): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.65.

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The R2O-MO- Al2O3-SiO2 system glasses were prepared by conventional melt quenching technology. The composition mass fraction range of the glass is SiO2 (55%∼65%), MgO (0%∼15.2%), CaO (0%∼15.2%), SrO (0%∼15.2%), BaO (0%∼15.2%), Na2O (0%∼15.6%), K2O (0%∼15.6%). The relationship between the composition and the thermal expansion coefficient of the glass was investigated by comparing the thermal expansion coefficients of the glasses with different chemical composition. The results show that the thermal expansion coefficient of the glass increases sharply with the increase of alkali-metal oxide content and when K+, Na+ and Li+ exist simultaneously in the structure of the glass, the complex “mixed alkali effect” can be observed from the composition–thermal expansion coefficient curve. When introducing different kind but same quantity alkaline-earth metal oxide, the thermal expansion coefficient of the glasses increased obviously with the rising of the radius of alkaline-earth metal ions but the “mixed alkali effects” can also be observed for the glasses containing a few kinds of alkaline-earth metal oxides.

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Farid, Saad B. H. "Modeling of Viscosity and Thermal Expansion of Bioactive Glasses". ISRN Ceramics 2012 (4.12.2012): 1–5. http://dx.doi.org/10.5402/2012/816902.

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The behaviors of viscosity and thermal expansion for different compositions of bioactive glasses have been studied. The effect of phosphorous pentoxide as a second glass former in addition to silica was investigated. Consequently, the nonlinear behaviors of viscosity and thermal expansion with respect to the oxide composition have been modeled. The modeling uses published data on bioactive glass compositions with viscosity and thermal expansion. -regression optimization technique has been utilized for analysis. Linear and nonlinear relations are shown to establish the viscosity and thermal expansion coefficients associated with oxide components of the glasses under study. The modeling allows the calculation of viscosity for a given temperature and, accordingly, the fusion temperature of these glasses along with the coefficient of thermal expansion. The established model relations also suggest first- and second-order phosphorus-alkali and alkaline earth oxides interaction which is reflected on the model coefficient that calculates viscosity and thermal expansion.

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Song, Weon-Keun. "Effective thermal expansion coefficient of frozen granite soil". Canadian Geotechnical Journal 44, nr 10 (październik 2007): 1137–47. http://dx.doi.org/10.1139/t07-047.

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The paper focuses on the development of a model for the coupled thermal transfer and frost action of a soil medium, considering the phase-change effect in the frozen fringe, for a closed system. The frost pressure of the cylindrical soil specimens observed in the freezing test gave a reference value to determine the effective thermal expansion coefficient numerically. Through the proposed numerical technique, the effective thermal expansion coefficient was defined for the frozen granite soil as a function of subzero temperature and initial in situ pore-water content. A comparative analyses between the numerical results and the measurements obtained in the freezing chamber test was conducted to verify the performance of the effective thermal expansion coefficient and the agreement was good.

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Wang, Ai Kai, Ya Dong Xue, Rui Wang, Suo Xiang Lv, Xiao Kang She, Bo Li i Heng Jiao Tian. "Experimental Study on Thermal Expansion Properties and Micro-Pore Texture of High Strength Concrete in Early Age". Advanced Materials Research 250-253 (maj 2011): 497–501. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.497.

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The early age cracking of concrete is concerned with its thermal expansion properties, which is mainly reflected by the thermal expansion coefficient. Reasonably controlling the coefficient is an effective way of reducing cracks in the early age of concrete. While thermal expansion properties are related to the micro-pore texture characteristics of the concrete. Micro-pore textures of concretes of different mixing ratios and curing time were measured via mercury intrusion porosimetry (MIP), and the thermal expansion coefficient was determined by the comparator. The analysis of test results indicates the correlation between the parameters of micro-pore texture and thermal expansion properties, and also shows a highly positive correlation between the pore area and the thermal expansion coefficient. The results provide a solution for reducing the thermal expansion coefficient, thus controlling the early age cracking.

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Aggarwal, Himanshu, Raj Kumar Das, Emile R. Engel i Leonard J. Barbour. "A five-fold interpenetrated metal–organic framework showing a large variation in thermal expansion behaviour owing to dramatic structural transformation upon dehydration–rehydration". Chemical Communications 53, nr 5 (2017): 861–64. http://dx.doi.org/10.1039/c6cc07995d.

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A five-fold interpenetrated MOF has the highest uniaxial negative thermal expansion coefficient reported for any interpenetrated MOF to date. Upon dehydration, the framework shows considerable change in the magnitudes of the thermal expansion coefficients.

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Mahmoodi, Mohammad Javad, Mohammad Kazem Hassanzadeh-Aghdam i Reza Ansari. "Effects of added SiO2 nanoparticles on the thermal expansion behavior of shape memory polymer nanocomposites". Journal of Intelligent Material Systems and Structures 30, nr 1 (6.11.2018): 32–44. http://dx.doi.org/10.1177/1045389x18806405.

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In this study, a unit cell–based micromechanical approach is proposed to analyze the coefficient of thermal expansion of shape memory polymer nanocomposites containing SiO2 nanoparticles. The interphase region created due to the interaction between the SiO2 nanoparticles and shape memory polymer is modeled as the third phase in the nanocomposite representative volume element. The influences of the temperature, volume fraction, and diameter of the SiO2 nanoparticles on the thermal expansion behavior of shape memory polymer nanocomposite are explored. It is observed that the coefficient of thermal expansion of shape memory polymer nanocomposite decreases with the increase in the volume fraction up to 12%. Also, the results reveal that with the increase in temperature, the shape memory polymer nanocomposite coefficient of thermal expansion linearly increases. The role of interphase region on the thermal expansion response of the shape memory polymer nanocomposite is found to be very important. In the presence of interphase, the reduction in nanoparticle diameter leads to lower coefficient of thermal expansion for shape memory polymer nanocomposite, while the variation of nanoparticles diameter does not affect the coefficient of thermal expansion in the absence of interphase. Based on the simulation results, the shape memory polymer nanocomposite coefficient of thermal expansion decreases as the interphase thickness increases. In addition, the contribution of interphase coefficient of thermal expansion to the shape memory polymer nanocomposite coefficient of thermal expansion is more significant than that of interphase elastic modulus.

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Ding, Sha, Zhong He Shui, Teng Pan i Wei Chen. "Study on Preparation of Low-Thermal Expansion Coefficient Concrete with Fly Ash". Key Engineering Materials 599 (luty 2014): 89–92. http://dx.doi.org/10.4028/www.scientific.net/kem.599.89.

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The low-thermal expansion coefficient (CTE) of cement paste and concrete are designed and prepared with fly ash in this study. The thermal expansion property and pore structure of cement/concrete are tested by Thermal Dilatometer, MIP, and SEM. The test results show that the addition of fly ash lowers the thermal expansion rate and coefficient of hardened paste. The increase of addition level is accompanied by the decrease of the thermal expansion coefficient. The introduction of fly ash could improve the pore structure of concrete, thus improve the thermal expansion property of cement concrete.

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Mudry, S., I. Shtablavyi, U. Liudkevych i S. Winczewski. "Structure and thermal expansion of liquid bismuth". Materials Science-Poland 33, nr 4 (1.12.2015): 767–73. http://dx.doi.org/10.1515/msp-2015-0100.

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AbstractExperimental structural data for liquid Bi were used for estimation of the main structure parameters as well as the thermal expansion coefficient both in supercooled and superheated temperature ranges. It was shown that the equilibrium melt had a positive thermal expansion coefficient within a temperature range upon melting and a negative one at higher temperatures. The former was related to structure changes upon melting, whereas the latter with topologic disordering upon further heating. It was found that the superheated melt had a negative thermal expansion coefficient. The results obtained from structural data were compared with the thermal expansion coefficient calculated from the data of density for liquid Bi.

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Pernía-Espinoza, A., F. J. Martínez-de-Pisón, E. Martínez-de-Pisón i J. Blanco. "Analysis of rail cooling strategies through numerical simulation with instant calculation of thermal expansion coefficient". Revista de Metalurgia 46, nr 4 (30.08.2010): 308–19. http://dx.doi.org/10.3989/revmetalm.0911.

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Kaufman, Peter N., Brian Jamieson i Nuggehalli M. Ravindra. "Coefficient of thermal expansion–based MEMS infrared detector". Emerging Materials Research 3, nr 3 (czerwiec 2014): 136–43. http://dx.doi.org/10.1680/emr.12.00044.

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Yang, Guijuan, Ziying Ren i Jian Wang. "Thermal expansion coefficient measured by single slit diffraction". IOP Conference Series: Materials Science and Engineering 394 (8.08.2018): 042075. http://dx.doi.org/10.1088/1757-899x/394/4/042075.

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Bartl, Guido, Arnold Nicolaus, Ernest Kessler, René Schödel i Peter Becker. "The coefficient of thermal expansion of highly enriched28Si". Metrologia 46, nr 5 (24.06.2009): 416–22. http://dx.doi.org/10.1088/0026-1394/46/5/005.

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Bullard, R. Harrell, Karl F. Leinfelder i Carl M. Russell. "Effect of coefficient of thermal expansion on microleakage". Journal of the American Dental Association 116, nr 7 (czerwiec 1988): 871–74. http://dx.doi.org/10.14219/jada.archive.1988.0291.

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Infante, J. A., M. Molina–Rodríguez i Á. M. Ramos. "On the identification of a thermal expansion coefficient". Inverse Problems in Science and Engineering 23, nr 8 (20.04.2015): 1405–24. http://dx.doi.org/10.1080/17415977.2015.1032274.

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Hengchang, Xu, Liu Wenyi i Wang Tong. "Measurement of thermal expansion coefficient of human teeth". Australian Dental Journal 34, nr 6 (grudzień 1989): 530–35. http://dx.doi.org/10.1111/j.1834-7819.1989.tb04660.x.

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Kozlovskii, Yu M., S. V. Stankus i I. K. Igumenov. "Linear thermal expansion coefficient of porous stainless steel". Journal of Physics: Conference Series 1677 (listopad 2020): 012168. http://dx.doi.org/10.1088/1742-6596/1677/1/012168.

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