The Influence of the Kaolin Content on the Thermal Protection Property of Double-Layer Coating of Flexible Composites

2019 ◽  
Vol 956 ◽  
pp. 135-143
Author(s):  
Guo Yi Liu ◽  
Xiao Ming Zhao ◽  
Yuan Jun Liu
Keyword(s):  
Double Layer ◽  
Performance Indicators ◽  
Thermal Protection ◽  
Heat Insulation ◽  
Flexible Composites ◽  
Ablation Resistance ◽  
Comparison And Analysis ◽  
Protection Property ◽  
Resistance Performance ◽  
Layer Coating

The comparison and analysis for the preparation of related performance indicators of the thermal protection such as the ablation resistance performance, thermal stability at high temperature and reflection ability of the heat ray of kaolin double-layer coated flexible composites were carried on. Because of the 2 d stratified structure of kaolin, and at the same time it processes the higher refractoriness, excellent resistance to the elevated temperature, the certain heat insulation and the reflection performance of the heat ray, the adequate padding of kaolin can improve the prepared thermal protection ability of double-layer coating of flexible composites.

Ablation resistance and mechanism of SiC/ZrC-ZrB2 double layer coating for C/C composites under plasma flame

2020 ◽  
Vol 27 (9) ◽  
pp. 2538-2547
Author(s):  
Han-zhou Liu ◽  
Xin Yang ◽  
Cun-qian Fang ◽  
An-hong Shi ◽  
Lei Chen ◽  
...  
Keyword(s):  
Double Layer ◽  
Plasma Flame ◽  
Ablation Resistance ◽  
Layer Coating

Design on Thermal Protection Structure of C/SiC Lattice Composite Materials

2012 ◽  
Vol 512-515 ◽  
pp. 808-811
Author(s):  
Yu Gao ◽  
Tao Zeng ◽  
Dai Ning Fang ◽  
Shi Yan
Keyword(s):  
Double Layer ◽  
Thermal Protection ◽  
Lattice Structure ◽  
Thermal Structure ◽  
Geometrical Parameters ◽  
Finite Element Software ◽  
Protection Layer ◽  
Protection Property ◽  
Thermal Protection Structure ◽  
Protection Structures

A new double-layer lattice structure based on C/SiC composite material is described and being investigated as a means to increase the service temperature of thermal protection structure. The design incorporates a C/SiC double-layer sandwich comprising two pyramidal truss cores. The outer layer of the sandwich structure is the thermal protection layer, which can make the heat redistribute. The internal layer is the insulation layer, which can decrease the temperature of the hot components and increase their reliability. The temperature field of C/SiC lattice thermal protection structures with different geometrical parameters was calculated by the finite element software ANSYS. It is found that the thermal behavior of the double-layer lattice thermal structure is affected by the truss geometry, such as truss length and inclination angle. The thermal protection capacity of C/SiC lattice structure is analyzed and compared with the equivalent solid structure. The results indicated that C/SiC lattice thermal protection structure has lower density and better thermal protection property than the traditional thermal protection structures.

Double layer water-borne heat insulation coatings containing hollow glass microspheres (HGMs)

2016 ◽  
Vol 45 (5) ◽  
pp. 346-353 ◽  
Author(s):  
Dawei Zhang ◽  
Haiyang Li ◽  
Hongchang Qian ◽  
Luntao Wang ◽  
Xiaogang Li
Keyword(s):  
Double Layer ◽  
Heat Insulation ◽  
Salt Spray ◽  
Barrier Properties ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Content Type ◽  
Hollow Glass ◽  
Insulation Performance ◽  
Layer Coating

Purpose This study aims to construct a double layer heat insulation coating based on hollow glass microspheres (HGMs) and to investigate the effect of particle size on barrier property and heat insulation performance. Design/methodology/approach The waterborne double layer coating was composed of an anticorrosive epoxy ester primer and an HGM-containing silicone acrylic topcoat. With varied HGM sizes (20 μm, 40 μm, 60 μm and a 1:3 w/w mixture of 20 and 60 μm particles), the coating was immersed in 3.5 wt% NaCl solution for 28 days and was then subjected to a salt spray test for 450 h. The barrier properties of the coating were evaluated through electrochemical impedance spectroscopy. Heat insulation performance was examined using a self-made device. Findings The addition of HGMs decreased the barrier properties of the coating by creating particle/resin interfaces for water penetration. In the HGMs-containing coatings, the use of larger HGMs showed relatively good barrier properties because of the lower particle density. The coating with smaller particles yielded a higher heat insulating capacity as indicated by lower equilibrium temperatures. Research limitations/implications Future work will be focused on improving the barrier properties of the coating. Field exposure tests should also be performed to assess the long-term performance of the coating. Practical implications The mechanical properties of the coatings in this study also implied that HGMs can be used to develop scratch-resistant and impact-resistant coatings. Other potential applications for further studies include the uses of HGMs for coatings with improved fire retardancy and electromagnetic interference shielding. Originality/value A double layer coating was developed to provide balanced performance on both anticorrosion and heat insulation. The effects of HGM size were particularly highlighted.

AERO-THERMO-DYNAMIC STUDY OF ULTRA-HIGH- TEMPERATURE CERAMIC COMPOSITES FOR THERMAL PROTECTION SYSTEMS AND ROCKET NOZZLES

2021 ◽  
Author(s):  
STEFANO MUNGIGUERRA ◽  
ANSELMO CECERE ◽  
RAFFAELE SAVINO
Keyword(s):  
High Temperature ◽  
Thermal Protection ◽  
Ceramic Composites ◽  
Thermal Protection Systems ◽  
Research Activities ◽  
Ablation Resistance ◽  
Protection Systems ◽  
Project Objectives ◽  
Ultra High Temperature

The most extreme aero-thermo-dynamic conditions encountered in aerospace applications include those of atmospheric re-entry, characterized by hypersonic Mach numbers, high temperatures and a chemically reacting environment, and of rocket propulsion, in which a combusting, high-pressure, supersonic flow can severely attack the surfaces of the motor internal components (particularly nozzle throats), leading to thermo-chemical erosion and consequent thrust decrease. For these applications, Ultra-High-Temperature Ceramics (UHTC), namely transition metal borides and carbides, are regarded as promising candidates, due to their excellent high-temperature properties, including oxidation and ablation resistance, which are boosted by the introduction of secondary phases, such as silicon carbide and carbon fibers reinforcement (in the so-called Ultra-High- Temperature Ceramic Matrix Composites, UHTCMC). The recent European H2020 C3HARME research project was devoted to development and characterization of new-class UHTCMCs for near-zero ablation thermal protection systems for re-entry vehicles and near-zero erosion rocket nozzles. Within the frame of the project and in collaboration with several research institutions and private companies, research activities at the University of Naples “Federico II” (UNINA) focused on requirements definition, prototypes design and test conditions identification, with the aim to increase the Technology Readiness Level (TRL) of UHTCMC up to 6. Experimental tests were performed with two facilities: an arc-jet plasma wind tunnel, where small specimens were characterized in a relevant atmospheric re-entry environment (Fig.1a), and a lab-scale hybrid rocket engine, where material testing was performed with different setups, up to complete nozzle tests, in conditions representative of real propulsive applications (Fig.1b). The characterization of the aero-thermo-chemical response and ablation resistance of different UHTCMC formulations was supported by numerical computations of fluiddynamic flowfields and materials thermal behavior. The UNINA activities provided a large database supporting the achievement of the project objectives, with development and testing of full-scale TPS assemblies and a large-size solid rocket nozzle.

The Fire Resistance Performance of Double-Layer Square Pyramid Silo-Shell Structure under Fire

2013 ◽  
Vol 405-408 ◽  
pp. 2305-2310
Author(s):  
Ling Feng Gong ◽  
Yin Bai ◽  
Jian Lei Zhai
Keyword(s):  
Double Layer ◽  
Fire Resistance ◽  
Shell Structure ◽  
Room Temperature ◽  
Uniform Temperature ◽  
Global Instability ◽  
Element Analysis ◽  
Fire Temperature ◽  
Resistance Performance ◽  
Typical Temperature

With fire temperature rising, elastic modulus of steel would be reduce, which then would lead to global instability phenomenon of double-layer square pyramid silo-shell structure. In order to analyze its fire resistance performance under high fire temperature, different geometric parameters were set based on the effect factors when it operated normally at room temperature. To analyze its displacement change by conducting nonlinear finite element analysis which was under the two typical temperature rising cases including global non-uniform temperature and localized high temperature. Then, with the temperature rising, the fire resistance performance and the maxium displacement changing rule were obtained.

scholarly journals Ablation Behaviour and Microstructure of Carbon/Carbon and Hybrid Carbon/Carbon Composites Based on Plasma Torch Heating

2017 ◽  
Vol 26 (4) ◽  
pp. 096369351702600 ◽  
Author(s):  
Li Ma ◽  
Lu Jv He ◽  
Cai Song Mo ◽  
Li Bin Zhang ◽  
Mao Sen Pan ◽  
...  
Keyword(s):  
Plasma Torch ◽  
Carbon Matrix ◽  
Ablation Rate ◽  
Carbon Composites ◽  
Carbon Fibres ◽  
Fibre Bundles ◽  
Composites Materials ◽  
Ablation Resistance ◽  
Resistance Performance ◽  
Hybrid Carbon

The ablation properties and morphologies of two kinds of fine Fine-woven pierced composites materials, carbon/carbon (C/C) and hybrid C/C with tungsten (W) filaments in z directional carbon fibre bundles, were investigated. A plasma torch was used to explore the ablative characteristics in terms of linear/bulk ablation rate and microscopic pattern of ablation. Surface and in-depth temperatures during ablation were measured by using optical pyrometers and thermocouples. The experimental results showed that the C/C composite presented the best ablation resistance performance, followed by the hybrid C/C composite, while that of graphite was the worst. It was found that the thermo-mechanical ablation resistance of carbon matrix is equal to that of carbon fibres. The existence of WC not only had a faster intrinsic ablation velocity, but also accelerated the ablation velocity of the carbon fibres and carbon matrix, and significantly improved the ablation velocity of the carbon fibres.

PAN/PI functional double-layer coating for dendrite-free lithium metal anodes

2020 ◽  
Vol 8 (13) ◽  
pp. 6183-6189 ◽  
Author(s):  
Fei Shen ◽  
Kaiming Wang ◽  
Yuting Yin ◽  
Le Shi ◽  
Dingyuan Zeng ◽  
...  
Keyword(s):  
Double Layer ◽  
Lithium Metal ◽  
Functional Layer ◽  
Pan Fiber ◽  
Lithium Metal Anodes ◽  
Layer Coating ◽  
Metal Anodes

A PAN fiber/PI sphere double-layer coating serves as an interfacial functional layer to guide uniform Li deposition.

Research of Thermophysical Properties of the Ultrathin Liquid Heat-Insulation

2018 ◽  
Vol 284 ◽  
pp. 1080-1085 ◽  
Author(s):  
O.V. Burlachenko ◽  
O.G. Chesnokova ◽  
T.F. Cherednichenko
Keyword(s):  
Thermal Properties ◽  
Thermophysical Properties ◽  
Thermal Protection ◽  
Heat Insulation ◽  
Outer Wall ◽  
Graphical Analysis ◽  
Average Temperature ◽  
Inner Surface ◽  
Liquid Heat ◽  
Bearing Part

The article highlights the results of the study of thermophysical properties of ultrathin liquid insulation when used to protect steel elements embedded in a multilayer outer wall. Conducted graphical analysis of the problem being solved. The results of temperature calculations with linear thermal properties showed that the unprotected insulation of steel embedded elements may freeze, and the formation of mold on the inner surface of the wall. The use of superfine heat insulation for thermal protection of mortgages of steel elements inside the construction of multilayer exterior walls gives a positive result. As a result of constructive solutions with the use of superfine thermal insulation can increase the average temperature of the inner bearing part of a wall of concrete. In addition, there is also a possibility to increase the temperature on the contact line between steel element with a load-bearing wall of concrete.

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