Studies on Thermal Property of Silica Aerogel/Epoxy Composite

2007 ◽  
Vol 546-549 ◽  
pp. 1581-1584 ◽  
Author(s):  
Jiu Peng Zhao ◽  
Deng Teng Ge ◽  
Sai Lei Zhang ◽  
Xi Long Wei
Keyword(s):  
Thermal Conductivity ◽  
Thermal Property ◽  
Epoxy Resin ◽  
Silica Aerogel ◽  
Epoxy Composite ◽  
Transfer Model ◽  
Insulation Material ◽  
Thermal Transfer ◽  
Heat Distortion Temperature ◽  
Ft Ir

Silica aerogel/epoxy composite, a kind of efficient thermal insulation material, was prepared by doping silica aerogel of different sizes into epoxy resin through thermocuring process. The results of thermal experiments showed that silica aerogel/epoxy composite had a lower thermal conductivity (0.105W/(m·k) at 60 wt% silica aerogel) and higher serviceability temperature (Martens heat distortion temperature: 160°C at 20 wt% silica aerogel). In addition, the composite doping larger size (0.2-2mm) of silica aerogel particle had lower thermal conductivity and higher Martens heat distortion temperature. Based on the results of SEM and FT-IR, the thermal transfer model was established. Thermal transfer mechanism and the reasons of higher Martens heat distortion temperature have been discussed respectively.

Research on Heat Transfer Characteristics of Nano-Porous Silica Aerogel Material and its Application on Mars Surface Mission

2014 ◽  
Vol 924 ◽  
pp. 329-335 ◽  
Author(s):  
Cong Hang Li ◽  
Shi Chen Jiang ◽  
Zheng Ping Yao ◽  
Song Sheng ◽  
Xin Jian Jiang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Silica Aerogel ◽  
Thermal Environment ◽  
Porous Silica ◽  
Heat Transfer Model ◽  
Heat Radiation ◽  
Transfer Model ◽  
Ambient Conditions ◽  
Coupled Heat Transfer

Based on the nanoporous network structure features of silica aerogel, the gas-solid coupled heat transfer model of silica aerogel is analyzed, and the calculation formulas of the gas-solid coupled, the gas thermal conductivity and the heat radiation within the aerogel are derived. The thermal conductivity of pure silica aerogel is calculated according to the derived heat transfer model and is also experimentally measured. Moreover, measurements on the thermal conductivities of silica aerogel composites with different densities at ambient conditions are performed. And finally, a novel design of silica aerogel based integrated structure and thermal insulation used for withstanding the harsh thermal environment on the Martin surface is presented.

scholarly journals Effect of Granular Silica Aerogel as Filler on Tensile and Flexural Strengths and Moduli of Stone-Wool-Fibre-Reinforced Composite as Rigid Board Roof Insulation Material

2021 ◽  
Vol 945 (1) ◽  
pp. 012061
Author(s):  
Nadzhratul Husna ◽  
Syed Ahmad Farhan ◽  
Mohamed Mubarak Abdul Wahab ◽  
Mohamed Mubarak Abdul Wahab ◽  
Nasir Shafiq ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silica Aerogel ◽  
Strength Properties ◽  
Cold Weather ◽  
Wool Fibre ◽  
Insulation Material ◽  
Compression Moulding ◽  
Living Space ◽  
Stone Wool ◽  
Hot Weather

Abstract Installation of stone wool as thermal insulation in the roof assembly can be adopted to store heat in the living space, if the building is exposed to cold weather, and, inversely, to retard heat from entering the living space, if it is exposed to hot weather. In spite of the effectiveness of stone wool as a roof insulation material, during installation, it can cause irritation to the skin and can be hazardous to the lungs. Therefore, incorporation of stone wool with other materials to form a rigid board, without compromising its effectiveness as a roof insulation material, is imperative. Strength properties of a stone-wool-fibre-reinforced high-density polyethylene (HDPE) composite roof insulation material were studied. Granular silica aerogel, which possesses an ultra-low thermal conductivity, was added as filler to reduce the thermal conductivity of the composite. Hot compression moulding was performed to prepare samples of the composite with varying silica aerogel content of 0, 1, 2, 3, 4, and 5 wt. %. Findings suggest that 2 wt.% is the optimum silica aerogel content as it resulted in the highest flexural strength and modulus, which is 24.4 MPa and 845.85 MPa, respectively, even though it reduced the tensile strength and modulus by 10% and 4.45% respectively, relative to 0 wt. %, which can be considered as inconsequential. Higher silica aerogel content above 2 wt. % may result in poor interfacial adhesion and low compatibility to the stone wool fibre and HDPE, which further reduces the tensile and flexural strengths and moduli of the composite.

Mechanical and thermal properties of reticulated SiC aerogel composite prepared by template method

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4117-4124
Author(s):  
Xinli Ye ◽  
Zhaofeng Chen ◽  
Sufen Ai ◽  
Junxiong Zhang ◽  
Bin Hou ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Silica Aerogel ◽  
Sol Gel ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Template Method ◽  
Mechanical And Thermal Properties ◽  
Insulation Material ◽  
Aerogel Composite

A novel structure-controllable reticulated silicon carbide (SiC) skeleton-reinforced silica aerogel composites (SiC/aerogel) were fabricated successfully by template method. Three-dimensional SiC skeletons prepared by different deposition time were prepared via the chemical vapor deposition technology, and then the silica aerogel was induced by the sol–gel process. The test results showed that the mechanical properties increased and thermal conductivities decreased remarkably after impregnating reticulated SiC skeleton with silica aerogel. The SiC/aerogel-24 possessed the highest compressive strength of 0.82 MPa with the thermal conductivity of 0.1597 W/(m·K) at 600℃, while the SiC/aerogel-12 exhibited the lowest thermal conductivity of 0.1244 W/(m·K) and its compressive strength was 0.64 MPa. The present work reported a novel method to manufacture the structure-controllable reticulated SiC aerogel composite which could be used as a high-temperature super-thermal insulation material for the potential applications.

scholarly journals Building-Information-Modelling-Based Thermal-Energy Performance Evaluation of Silica-Aerogel-Incorporated Rigid Board Roof Insulation Material for Residential Buildings in the Tropical Climate of Malaysia

2021 ◽  
Vol 945 (1) ◽  
pp. 012066
Author(s):  
Nadzhratul Husna ◽  
Syed Ahmad Farhan ◽  
Mohamed Mubarak Abdul Wahab ◽  
Nasir Shafiq ◽  
Muhammad Taufiq Sharif ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Comfort ◽  
Thermal Energy ◽  
Silica Aerogel ◽  
Residential Buildings ◽  
Energy Performance ◽  
Insulation Material ◽  
Building Information Modelling ◽  
Indoor Thermal Comfort ◽  
Building Information

Abstract Malaysia is located in the equator, with a hot and humid climate. The highest temperature recorded during the day was 39 °C, which leads to discomfort among building occupants, in particular, residential buildings, where indoor thermal comfort is of a higher priority compared to other types of buildings. Hence, the thermal performance of the residential roof assembly needs to be improved to lower the indoor temperature and, accordingly, maintain the level of indoor thermal comfort. In view of the need to improve the thermal performance, a silica-aerogel-incorporated rigid board roof insulation material for residential buildings was developed using kapok fibre, high density polyethylene (HDPE) and silica aerogel. The thermal conductivity of the material was measured. The sample with 4 wt. % and 5 wt. % of silica aerogel content obtained the lowest thermal conductivity of 0.04 W/mK. Silica aerogel content of above 4 wt. % did not result in further reduction of the thermal conductivity. Therefore, it can be concluded that the optimum silica aerogel content for the sample was 4 wt. %. Building-Information-Modelling (BIM)based thermal-energy performance evaluation of the material was performed by generating temperature and cooling load data using Integrated Environmental Solution-Virtual Environment to validate the thermal-energy performance of the material, by installing the material within the roof assembly of a residential BIM. Findings indicate that the material can potentially be employed in the future as a roof insulation material to maintain the level of indoor thermal comfort among residential building occupants.

Graphene Nanoplatelets/Epoxy Resin Composites With High Thermal Conductivity

2016 ◽  
Author(s):  
Yu Qi ◽  
Wei Yu ◽  
Li-Fei Chen ◽  
Hua-qing Xie ◽  
Ming-Zhu Wang
Keyword(s):  
Thermal Conductivity ◽  
Epoxy Resin ◽  
Mass Fraction ◽  
Graphene Nanoplatelets ◽  
Resin Matrix ◽  
Heat Conducting ◽  
Molding Method ◽  
Thermal Transfer ◽  
Conducting Property ◽  
Ep Matrix

Graphene nanoplatelets (GNPs) are a kind of material with excellent thermal conductivity. It can significantly improve the heat-conducting property of epoxy resin (EP) matrix. In this study, GNPs/EP composites were prepared by ultrasonication and the cast molding method. The effect of optimization in the preparation process on the thermal transfer performance of the composites was discussed. The pulverizing time of GNPs and three-roll grinder grinding of composites were considered. The results indicated that when the mass fraction of GNPs was 4.3%, in its pulverizing time of 2s, the thermal conductivity of GNPs/EP composites was up to 0.99 W/m·K, and it was increased by 9% compared with non-pulverization treatment. However, after pulverizing two seconds and grinding three times, the thermal conductivity of the composite reached the maximum (1.06 W/m·K) when the mass fraction of GNPs was 4.3%, and it was finally increased by 307.7% compared with epoxy resin matrix.

Research and Application for In Situ Blend of Infrared Opacifiers Titanium Oxide in Silica Aerogel

2020 ◽  
Vol 845 ◽  
pp. 33-38
Author(s):  
Li Jun Su ◽  
Hui Guo ◽  
Han Song ◽  
Rui Jie Wang ◽  
Wen Jing Li
Keyword(s):  
Thermal Conductivity ◽  
Titanium Oxide ◽  
Silica Aerogel ◽  
Thermal Protection ◽  
Infrared Light ◽  
Dispersion Property ◽  
Insulation Material ◽  
Heat Insulation Material ◽  
Oxide Particles

As its much lower thermal conductivity than other usual materials, Silica aerogel is a potentially efficient heat insulation material with the lowest bulk density. However, it is transparent for infrared light when used in high temperature. Herein, titanium oxide was added in the silica aerogel by in-situ blending. The dispersion property of titanium oxide particles, microstructure mechanical property, thermal conductivity, and thermal insulation were investigated. The results of this in-situ blending process indicated a potential application value in aerospace thermal protection industry.

scholarly journals Functional Polymer Composite with Core-Shell Ceramic Filler: II. Rheology, Thermal, Mechanical, and Dielectric Properties

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2161
Author(s):  
Andrzej Rybak
Keyword(s):  
Thermal Conductivity ◽  
Epoxy Resin ◽  
Epoxy Composite ◽  
Linear Thermal Expansion ◽  
Dielectric Strength ◽  
Electrical Insulation ◽  
Core Shell ◽  
Dielectric Parameters ◽  
Standard Material ◽  
The Core

Epoxy resin composites filled with ceramic particles are commonly applied in electrification devices as an electrical insulation. In order to maintain proper functionality of such apparatuses it is crucial to optimize a broad range of properties, such as thermal, mechanical and dielectric parameters. In an earlier paper, a novel core-shell filler was developed in order to enhance the thermal conductivity in the epoxy composite used as electrical insulation. The new filler was made of a standard material, which was covered by a thin layer of high thermally conductive shell, namely, alumina coated by aluminum nitride. It was previously shown that the epoxy resin filled with the core-shell Al2O3@AlN particles showed a significant increase in thermal conductivity with a 63% relative increase. In this paper, a set of complementary measurements was performed and analyzed, namely, rheology, tensile strength, dynamic mechanical analysis, and dilatometry. Moreover, the dielectric permittivity and strength, and electrical resistivity were investigated in order to check if the electrical insulation properties were maintained. The obtained results were compared with the epoxy composite filled with the standard filler. The rheological behavior of the core-shell filled system showed that the processability will not be hindered. The mechanical properties of the composite based on core-shell filler are better than those of the reference system. The coefficient of linear thermal expansion is lower for epoxy filled with core-shell filler, which can lead to better adhesion to internal parts in the electrification devices. The dielectric strength was enhanced by 16% for the core-shell filled epoxy. The investigation clearly demonstrates that the epoxy composite filled with the core-shell particles is an appropriate material for application as electrical insulation with enhanced thermal conductivity.

scholarly journals Hygrothermal Aging Characteristics of Silicone-Modified Aging-Resistant Epoxy Resin Insulating Material

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2145
Author(s):  
Yongqiang Wang ◽  
Zhuo Zeng ◽  
Meng Gao ◽  
Ziye Huang
Keyword(s):  
Dielectric Properties ◽  
Epoxy Resin ◽  
Aging Process ◽  
Contact Angles ◽  
Infrared Spectrometry ◽  
Insulation Material ◽  
Hygrothermal Aging ◽  
Insulation Materials ◽  
Dielectric Performance ◽  
Ft Ir

To study the improvement effect of silicone materials on the hygrothermal resistance of epoxy resin and the aging mechanism of silicone-modified insulation materials under hygrothermal conditions, diphenylsilanediol was added to epoxy resin as a modifier in various quantities to synthesize silicone-modified epoxy resin, and a hygrothermal aging test was carried out. Water sorption, surface contact angles and dielectric properties of the insulation material were measured, and scanning electron microscope (SEM), Fourier-transform infrared spectrometry (FT-IR) and frequency domain spectroscopy (FDS) were used to analyze the results. The results showed that under 10 wt%, the silicone-modified insulation materials exhibited lower absorption rate and better dielectric properties, including lower dissipation factors and lower dielectric constant during the hygrothermal aging process, while epoxy resin modified with excessive silicone material tend to show worse dielectric performance. Closer analysis found that diphenylsilanediol decreases the size of the cracks within the material during hygrothermal aging, indicating that cracks generated during the hygrothermal aging process may be the reason for the worse dielectric performance, and diphenylsilanediol improves the hygrothermal aging resistance mainly by slowing down the generation and growth rate of cracks. FT-IR results confirmed the existence of hydrolysis and found that the rate of hydrolysis does not change with the content of diphenylsilanediol. FDS results also indicated that modified materials contain less dipoles after hygrothermal aging.

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