Thermal ablation‐insulation performance, microstructural, and mechanical properties of carbon aerogel based lightweight heat shielding composites

2021 ◽  
Author(s):  
Mohammad Mehdi Seraji ◽  
Ahmad Arefazar
Keyword(s):  
Mechanical Properties ◽  
Thermal Ablation ◽  
Carbon Aerogel ◽  
Heat Shielding ◽  
Insulation Performance ◽  
Shielding Composites

Study on the thermal insulation performance of the core–shell skeleton graphene oxide/carbon composite aerogel

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hongli Liu ◽  
Peng Wang ◽  
Wenjin Yuan ◽  
Hongyan Li
Keyword(s):  
Graphene Oxide ◽  
Solid Phase ◽  
Three Dimensional ◽  
Carbon Aerogel ◽  
Carbon Composite ◽  
Core Shell ◽  
Composite Aerogel ◽  
Dimensional Network ◽  
Heat Shielding ◽  
Insulation Performance

Abstract Phenolic resin (PR) was grafted onto the surface of graphene oxide (GO) through π–π conjugation and chemical bonding. After carbonization, organic compounds turned into carbon layers with a thickness of about 10 nm and coated on the surface of GO formed a core–shell structure. Besides, the adiabatic interface formed during organic carbonization can effectively connect the aerogels into a three-dimensional network. The optimum mass ratio of GO was determined to be 10 wt% in the preparation of the precursor aerogel. The adiabatic interfaces (carbon) between GO lamellae could effectively reduce the solid phase heat transfer in aerogels (thermal conductivity is 0.0457 W m−1 K−1). At the same time, the existence of GO also ensured better mechanical properties of GO/carbon composite aerogel (compressive strength is 2.43 MPa) compared with the pure carbon aerogel (1.52 MPa), demonstrating the excellent heat-shielding performance and mechanical property of GO/carbon aerogel.

Preparation and Properties of SiC/Phenolic Resin for the Heat of LED

2016 ◽  
Vol 848 ◽  
pp. 454-459
Author(s):  
Cong Wu ◽  
Kang Zhao ◽  
Yu Fei Tang ◽  
Ji Yuan Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Experimental Results ◽  
Low Thermal Conductivity ◽  
Industry Standard ◽  
Insulation Performance

In order to solve the problem that low thermal conductivity of the plastics for the heat of LED, SiC/Phenolic resin for the heat of LED were fabricated combining powder metallurgy. The effects of particles diameters, content and adding nanoparticles on thermal conductivity of the fabricated composites were investigated, the mechanical properties were also characterized. The experimental results showed that the materials were obtained, and the insulation performance of the fabricated SiC/Phenolic resin was higher than the industry standard one, the thermal conductivity reached 4.1W/(m·k)-1. And the bending strength of the fabricated composites was up to 68.11MPa. The problem of low thermal conductivity of the material is expected to be solved. In addition, it is meaningful for improving LED life.

Effect of Heat Sinks on Visco-Elastic & Mechanical Properties of EPDM Based Ablative Composites

2010 ◽  
Vol 442 ◽  
pp. 52-58
Author(s):  
M.A. Bashir ◽  
H. Ahmad ◽  
R. Ahmed ◽  
R.A. Alvi ◽  
Mohammad Bilal Khan
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Heat Sinks ◽  
Elastic Behavior ◽  
Fiber Glass ◽  
Adverse Conditions ◽  
Reinforcing Fillers ◽  
Heat Shielding ◽  
Reinforcing Filler

Ablative composites are heat shielding, protective materials that are being used in aerospace industry to protect inner hardware and sensitive devices. The aero dynamic vehicles have to face high stresses, ultra high temperature and adverse conditions of air friction. It is required to develop the materials with light weight and high modulus. EPDM, being heat and ozone attack resistant is the best candidate for the preparation of ablative composites by introducing different heat sinks such as silica, glass fiber, carbon fiber, asbestos, carbon and their combinations have been studied in this work. The prepared materials were tested and it was found that visco elastic behavior of the composites affected by the addition of reinforcing filler (carbon, silica), semi-reinforcing filler (carbon fiber, glass fiber) and non-reinforcing filler (asbestos powder). Mechanical properties tested at different rates, revealed the improvement in tensile strength and % elongation in case of reinforcing and semi-reinforcing fillers but showed adverse effect in case of non-reinforcing fillers. Rheological investigations of these novel composites shows that moony viscosity of the materials containing glass fiber, carbon fiber, silica decreases in the order glass fiber > carbon fiber > silica.

Effect of hybrid hollow microspheres on thermal insulation performance and mechanical properties of silicone rubber composites

2017 ◽  
Vol 135 (11) ◽  
pp. 46025 ◽  
Author(s):  
Xiong-Wei Zhao ◽  
Chong-Guang Zang ◽  
Ya-Lun Sun ◽  
Yu-Long Zhang ◽  
Yu-Quan Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Insulation ◽  
Silicone Rubber ◽  
Hollow Microspheres ◽  
Rubber Composites ◽  
Insulation Performance

Preparation and Flame Ablation/Oxidation Behavior of ZrB2/SiC Ultra-High Temperature Ceramic Composites

2007 ◽  
Vol 351 ◽  
pp. 142-146 ◽  
Author(s):  
Chang An Wang ◽  
Hai Long Wang ◽  
Yong Huang ◽  
Dai Ning Fang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Thermal Ablation ◽  
Oxidation Behavior ◽  
Ceramic Composites ◽  
Argon Atmosphere ◽  
Good Resistance ◽  
Sic Ceramic ◽  
Sic Whiskers ◽  
Sic Composites

ZrB2/SiC ceramic composites reinforced by nano-SiC whiskers and SiC particles have been prepared by hot-pressing at 1950°C for 1hr under 20 MPa pressure in flow argon atmosphere. Effects of SiC addition on microstructure, mechanical properties and thermal ablation/oxidation behavior of ZrB2/SiC composites were investigated. The results showed that the addition of SiC effectively improved the densification of ZrB2/SiC composites and almost full dense ZrB2/SiC composites were obtained when the amount of SiC increased up to 20 vol%. Flexural strength and fracture toughness of the ZrB2/SiC composites were also enhanced; the maximum strength and toughness reached 600 MPa and 8.81 MPa·m1/2 at SiC additions of 20 vol % and 30 vol%, respectively. The composites possessed good resistance to flame ablation and could keep the whole shape without distinct peeling or cracking after flame ablation by oxyacetylene flame for 3 mins. The more SiC added, the better resistance to flame ablation the composites displayed.

Fabrication and properties of carbon/carbon-carbon foam composites

2019 ◽  
Vol 89 (21-22) ◽  
pp. 4452-4460
Author(s):  
Bin Wang ◽  
Bugao Xu ◽  
Hejun Li
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Bonding Strength ◽  
Carbon Foam ◽  
Shear Load ◽  
Foam Composite ◽  
Final Failure ◽  
Carbon Foams ◽  
Insulation Performance

This paper was focused on the development of a new composite for high thermal insulation applications with carbon/carbon (C/C) composites, carbon foams and an interlayer of phenolic-based carbon. The microstructure, mechanical properties, fracture mechanism and thermal insulation performance of the composite was investigated. The experiment results showed that the bonding strength of the C/C-carbon foam composite was 4.31 MPa, and that the fracture occurred and propagated near the interface of the carbon foam and the phenolic-based carbon interlayer due to the relatively weak bonding. The shear load-displacement curves were characterized by alternated linear slopes and serrated plateaus before a final failure. he experiment revealed that the thermal conductivity of the C/C-carbon foam composite was 1.55 W·m−1ċK−1 in 800℃, which was 95.8% lower than that of C/C composites, proving that the thermal insulation of the new foam composite was greatly enhanced by the carbon foam with its porous hollow microstructure.

scholarly journals A Cellular Automata Approach for the Modeling of a Polyamide and Carbon Aerogel Structure and Its Properties

Gels ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 35
Author(s):  
Natalia Menshutina ◽  
Igor Lebedev ◽  
Evgeniy Lebedev ◽  
Patrina Paraskevopoulou ◽  
Despoina Chriti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellular Automata ◽  
Initial Data ◽  
Development Time ◽  
Carbon Aerogel ◽  
Nanoporous Materials ◽  
Carbon Aerogels ◽  
Computer Study ◽  
Digital Representations ◽  
New Material

In this work, a cellular automata (CA) approach was used to generate 3D structures of polyamide and carbon aerogels. Experimental results are used as initial data for materials’ digital representations and to verify the developed CA models. Based on the generated digital structures, a computer study of aerogels’ mechanical properties was conducted. The offered CA models can be applied for the development of new nanoporous materials such as aerogels of different nature and allow for a reduction in the amount of required full-scale experiments, consequently decreasing development time and costs of new material formulations.

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