Thermal expansion behavior of MgO/Cu composite with lower MgO volume fraction

Guo, Xiuhua; Song, Kexing; Cui-hua, Zheng

doi:10.1016/j.materresbull.2012.08.012

Cited by 12 publications

(5 citation statements)

References 21 publications

(30 reference statements)

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“…The CTE due to ROM is given by [6] D D ¦ (1) where Į is the CTE value, V is the volume fraction, and the subscripts i refers to the component of the composite. ROM method [5], however, can be perfectly applied for an isotropic composite that has no effect of isostatic stress. To overcome such limitation, another more accurate calculation for CTE was proposed by Turner [10].…”

Section: Resultsmentioning

confidence: 99%

“…ROM method [5], however, can be perfectly applied for an isotropic composite that has no effect of isostatic stress. To overcome such limitation, another more accurate calculation for CTE was proposed by Turner [10]. If K i is the bulk modulus of the constituent, the theoretical CTE projected by Turner is given by…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we focused on examining the calculated CTE values of the SiO 2 -ceramic composites since it becomes a vital thermomechanical property in evaluating the thermal stability behavior and has always been viewed as a serious issue in designing the components which are subjected to temperature variations [4]. Some simple theoretical models to predict the CTE values of particle-reinforced composites based on the rule of mixture approximation are applied, in which the CTE or any other desired properties of the composites can be calculated from the average weight of the individual component [5].…”

Section: Introductionmentioning

confidence: 99%

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Thermal expansion coefficient prediction of fuel-cell seal materials from silica sand

Hidayat¹,

Triwikantoro²,

Baqiya³

et al. 2013

AIP Conference Proceedings

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This study is focused on the prediction of coefficient of thermal expansion (CTE) of silica-sand-based fuelcell seal materials (FcSMs) which in principle require a CTE value in the range of 9.5-12 ppm/°C. A semi-quantitative theoretical method to predict the CTE value is proposed by applying the analyzed phase compositions from XRD data and characterized density-porosity behavior. A typical silica sand was milled at 150 rpm for 1 hour followed by heating at 1000 °C for another hour. The sand and heated samples were characterized by means of XRD to perceive the phase composition correlation between them. Rietveld refinement was executed to investigate the weight fraction of the phase contained in the samples, and then converted to volume fraction for composite CTE calculations. The result was applied to predict their potential physical properties for FcSM. Porosity was taken into account in the calculation after which it was directly measured by the Archimedes method.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal expansion coefficient prediction of fuel-cell seal materials from silica sand

Hidayat¹,

Triwikantoro²,

Baqiya³

et al. 2013

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Owing to its low density, super thermodynamic stability, and similar lattice type and thermal expansion coefficient to copper, MgO is a desirable reinforcement to the copper–matrix composite. Our previous study showed that the MgO/Cu composite has a lower wear rate than SiC/Cu and SiO 2 /Cu composites, which is due to the difference in the CTE of the copper–matrix and reinforcements [13,14]. A common method for producing copper–matrix composites is through a powder metallurgy route [15,16].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of Cu–Mg alloy treated by internal oxidation

Guo

Zhou

Song

et al. 2018

Materials Science and Technology

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A Cu–0.24Mg alloy bar was treated by internal oxidation using Cu2O as an oxidiser at 1123–1273 K for 10 h. The thermodynamic diagram for oxidation of a Cu–Mg alloy was confirmed by the critical oxygen pressure. The results show that the thickness of the MgO/Cu layer and the electrical conductivity of the Cu–0.24Mg alloy increase with increasing internal oxidation temperature, whereas the average hardness of the MgO/Cu layer initially increases and subsequently decreases. Examination of the microstructure of the MgO/Cu layer revealed that Mg precipitation in the form of MgO particles and their uniform dispersion in the Cu matrix were the primary reasons for increases in the comprehensive properties of the Cu–Mg alloy treated by internal oxidation.

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“…The thermal expansion property is one of the most important thermomechanical properties used to evaluate the thermal dimensional stability, which has always been regarded as a critical criterion in the design of components subjected to temperature variations. 5,11,[17][18][19] Considering that the CTE of copper-matrix composites can be tailored by varying the kind, volume fraction and morphology of the reinforcements in the composite, much of its applications are aimed to control thermal expansion characteristics to match those of the other components. Therefore, investigating the relationship between the interface stress and CTE on copper-matrix composites with various reinforced phases is necessary.…”

Section: Introductionmentioning

confidence: 99%

Relationship between interfacial stress and thermal expansion coefficient of copper–matrix composites with different reinforced phases

Song

Guo

Zhao

et al. 2014

Materials Science and Technology

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Copper–matrix composites reinforced with Al2O3, SiO2, SiC and MgO nanoparticles were fabricated using powder metallurgy. The effects of the different nanoparticles on the thermal expansion behaviour of the composites were examined. The thermal expansion properties of the composites were evaluated using the coefficient of thermal expansion from 50 to 500°C. The relationship between interface stress and coefficient of thermal expansion of the copper–matrix composites with various reinforced phases was determined using theoretical models and experimental data. The results show that introducing dispersed nanoparticles into the copper matrix can significantly reduce the coefficient of thermal expansion. By contrast, increasing the temperature increases the thermal expansion coefficient of the copper–matrix composites and the interfacial pressure between the reinforcements and the copper matrix. The calculated pressure values at the nanoparticle–copper matrix interface suggest that plastic deformation occurred in the temperature range from 200 to 250°C for the SiO2/Cu and SiC/Cu composites and at 350°C for the MgO/Cu and Al2O3/Cu composites. These values are consistent with the variations observed in the measured coefficient of thermal expansion.

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Thermal expansion behavior of MgO/Cu composite with lower MgO volume fraction

Cited by 12 publications

References 21 publications

Thermal expansion coefficient prediction of fuel-cell seal materials from silica sand

Thermal expansion coefficient prediction of fuel-cell seal materials from silica sand

Microstructure and properties of Cu–Mg alloy treated by internal oxidation

Relationship between interfacial stress and thermal expansion coefficient of copper–matrix composites with different reinforced phases

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