The effect of low‐filler volume fraction on the elastic modulus and thermal expansion coefficient of particulate composites simulated by a multiphase model

Sideridis, E.; Kytopoulos, V. N.; Papadopoulos, George Α.; Bourkas, G. D.

doi:10.1002/app.28886

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…The CTE (14.2 × 10 −6 K −1 ) of Au is far larger than that of the SiC (3.8 × 10 −6 K −1 ), while the CTEs of TiC, Pd 2 Si, and Ni 2 Si are smaller than that of the Au. Incorporation of TiC, Pd 2 Si, and Ni 2 Si with a relatively lower CTE into the braze would decrease the CTE of the braze [37,38,39], leading to the decrease of CTE mismatch between the SiC and filler alloy. This effect would be beneficial to lower the stress level in the joint.…”

Section: Resultsmentioning

confidence: 99%

Characterization of SiC Ceramic Joints Brazed Using Au–Ni–Pd–Ti High-Temperature Filler Alloy

et al. 2019

Materials

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In this work, (Au79Ni17Pd4)96Ti4 (wt.%) filler alloy was designed and employed to join SiC ceramics. The effects of brazing temperature and soaking time on the microstructure and fracture morphology of joints were investigated. The results show that the joint obtained can be described as SiC/reaction layer/braze/reaction layer/SiC. The reaction layer was composed of TiC and Au (Si, Ti). The wettability of the filler alloy toward the SiC ceramics was analyzed. The braze zone was mainly constituted by Pd2Si, Ni2Si, and Au (Ni, Si). A large number of nano-sized TiC particles were distributed within the Au (Ni, Si) layer. The formation mechanism of the braze containing different phases was discussed. The brazing temperature and soaking time had a significant effect on the reaction layer at the SiC/braze interface and TiC particles within the Au (Ni, Si) layer, while they showed a negligible effect on the Pd2Si and Ni2Si within the braze. The inherent reason was also clarified in detail. The joint fractography indicated that a good bonding was achieved between the filler alloy and SiC, while joint fracture was primarily induced by the thermal stresses residing after the brazing cycle.

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Section: Resultsmentioning

confidence: 99%

Characterization of SiC Ceramic Joints Brazed Using Au–Ni–Pd–Ti High-Temperature Filler Alloy

et al. 2019

Materials

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Section: Resultsmentioning

confidence: 99%

“…Weak interface bonding between phases could not effectively incorporate the contributions of each component, while the strong interfacial bonding could compromise each ingredient for thermal expansion properties. 33,34 The CSR particles showed a higher CTE value than the neat epoxy, and this mismatch would increase the CTE of CSR-epoxy composites. However, the result is that the CTE value of the modified epoxy was decreased with lower CSR particle load (0?5 wt-%).…”

Section: Cte Values Below T Gmentioning

confidence: 99%

Coefficient of thermal expansion and mechanical properties at cryogenic temperature of core–shell rubber particle modified epoxy

He¹,

Sang²,

Zhang³

et al. 2014

Plastics, Rubber and Composites

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In order to obtain epoxy based composite with low coefficient of thermal expansion (CTE) and good mechanical properties at cryogenic temperature (77 K), core–shell rubber (CSR) particles were integrated into epoxy. Fourier transform infrared spectroscopy results showed the occurrence of intermolecular hydrogen bond between the CSR particles and the epoxy matrix. The results of thermomechanical analysis indicate that the CTE of CSR–epoxy composites below Tg reached the minimum of the CSR content of 0·5 wt-%, then followed by an increase when the CSR content was higher than 0·5 wt-%. The CTE value under Tg was decreased 18·89% with 0·5 wt-% CSR content. The tensile strength, Young's modulus and impact strength of CSR–epoxy composites at 77 K all reached a maximum with the CSR content of 0·5 wt-%, followed by a decrease when the CSR content was higher than 0·5 wt-%. The storage modulus of CSR modified epoxy resin in glassy region was higher than that of the neat epoxy resin.

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“…With the advent of nanoscale materials, the possibility arises in exploring the way in which small particle fillers may be used to achieve low values of CTE in composite structures. Deviations from the simple additivity relation equation (1) have long been recognized [ 5 ] and this article explores the effects of processing conditions on the observed values of CTE obtained with some novel nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Low coefficient of thermal expansion of thermoset composite materials

Rhoney

Pethrick

2011

Proceedings of the Institution of Mechanical Engineers, Part L:

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Selection of the correct resin – filler combination is important in achieving materials which have a low coefficient of thermal expansion (CTE). A study of nanosilica-modified resin, in combination with silica fillers, allows low levels of CTE to be achieved. In this study, a novel curing agent, ytterbium triflate, is reported. This curing agent provides a stable catalyst system which can be used to create the viscous composite mixtures but has the facility of effective cure over a relatively narrow temperature range from 70 °C to 100 °C. A series of formulations were examined based on incorporation of fillers with nanoscale silica particles into either the pure resin or a resin which contained nanoscale functionalized silica particles. The filler incorporation leads to a significant increase in the glass transition temperature as determined by dynamic mechanical thermal analysis. The CTE was observed to be lower below T g than above it. Changing the nanosilica particle size and distribution produced significant changes in the values. However, the CTE scaled according to the total silica content; and the values were in general lower than those calculated theoretically. The use of a highly functional o-cresol epoxy novolac demonstrated how increasing functionality raised the T g and lowered the CTE, but the use of too high a post-cure temperature reversed this trend. Very good results were achieved using 3,4-epoxycyclohexylmethyl, 3,4 epoxycyclohexanecarboxylate, which has a low viscosity and allowed high levels of silica to be readily achieved. This article indicates how the adjustment of the epoxy selected to be used as the base material and the type of silica particles used allows the values of T g and CTE to be modified in a composite material

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The effect of low‐filler volume fraction on the elastic modulus and thermal expansion coefficient of particulate composites simulated by a multiphase model

Cited by 10 publications

References 37 publications

Characterization of SiC Ceramic Joints Brazed Using Au–Ni–Pd–Ti High-Temperature Filler Alloy

Characterization of SiC Ceramic Joints Brazed Using Au–Ni–Pd–Ti High-Temperature Filler Alloy

Coefficient of thermal expansion and mechanical properties at cryogenic temperature of core–shell rubber particle modified epoxy

Low coefficient of thermal expansion of thermoset composite materials

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