scholarly journals Preparation and Properties of SiBCO Aerogel and Its Composites

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 40 ◽  
Author(s):  
Xiafei Li ◽  
Junzong Feng ◽  
Jie Yin ◽  
Yonggang Jiang ◽  
Jian Feng
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Thermal Insulation ◽  
Phenylboronic Acid ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Supercritical Drying ◽  
Temperature Resistance ◽  
Mullite Fiber ◽  
Boron Source

To obtain new high-temperature resistant composites that can meet the requirements of aircraft development for thermal insulation and mechanical properties, SiBCO aerogel composites were prepared by sol-gel, supercritical drying and high-temperature pyrolysis with trimethyl borate (TMB) or phenylboronic acid (PBA) as the boron source and mullite fiber as reinforcement. The structure and composition of the SiBCO aerogel and its composites were characterized with SEM, FT-IR, ICP and nitrogen adsorption tests. The specific surface area of the SiBCO aerogel is 293.22 m2/g, and the pore size is concentrated in the range of 10–150 nm. The mechanical properties, the thermal insulation properties and the temperature resistance were also studied. Due to the introduction of boron, the temperature resistance of SiBCO aerogel composites is improved greatly, and the service temperature of composites reached 1773 K. When n (TMB)/n (TEOS) = 1/1, the temperature resistance of the composites is the best. After heating in air at 1773 K for 30 min, the shrinkage of SiBCO aerogel composites is only 2.45%, and the thermal conductivity of the composites is 0.138 W/(m·K) at 1773 K. In addition, the type and amount of catalyst also have certain effects on the mechanical properties and temperature resistance of the composites.

Performance Comparison of Aerospace High-Temperature Resistant Ceramic Fiber Felt

2021 ◽  
Vol 1036 ◽  
pp. 168-174
Author(s):  
Jian Ye Guo ◽  
Li Jun Su ◽  
Chao Jun Wu ◽  
Wen Jing Li ◽  
Jie Ying Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Insulation ◽  
Silica Fiber ◽  
Ceramic Fiber ◽  
Quartz Fiber ◽  
Temperature Resistance ◽  
Mullite Fiber ◽  
High Silica ◽  
Better Than ◽  
Resistant Ceramic

Be aimed at the development and application of aerospace high-temperature resistant ceramic fiber felt, in this paper, as the common ceramic fiber felt in the field of high temperature resistance, quartz fiber felt, high silica fiber felt and mullite fiber felt were compared. The microstructure, thermal insulation, temperature resistance and mechanical properties were analyzed respectively, the performance advantages and disadvantages of three kinds of ceramic fiber felt were given, and its internal causes were studied. The results show that, the temperature resistance of mullite fiber felt is better than that of quartz fiber felt and high silica fiber felt, mainly due to its polycrystalline mullite structure, the thermal insulation performance of mullite fiber felt and high silica fiber felt is better than quartz fiber felt at high temperature, mainly due to the thermal reflection of polycrystalline mullite and the small pore structure of high silica fiber felt, the compressibility of quartz fiber felt is better than high silica fiber felt and mullite fiber felt.

ZIRCONIA FIBERS AS A COMPONENT OF HIGH TEMPERATURE THERMAL INSULATION (review)

2021 ◽  
pp. 79-86
Author(s):  
V.G. Babashov ◽  
◽  
N.M. Varrik ◽  
Keyword(s):  
High Temperature ◽  
Thermal Insulation ◽  
Zirconium Oxide ◽  
Thermal Protection ◽  
Sol Gel ◽  
Precursor Solution ◽  
Technical Literature ◽  
Thermal Protection Systems ◽  
Insulation Materials ◽  
Protection Systems

Based on the analysis of recent publications of scientific and technical literature, data on the production of zirconium oxide fibers used for the manufacture of high-temperature thermal insulation materials are presented. Information is provided on various methods of obtaining zirconium oxide fibers (methods of impregnation of the template and molding of the mixture, sol-gel method of spinning a fiber-forming precursor solution), as well as on the technique of fiber molding (manual pulling, dry and wet spinning, blowing and electrospinning). The use of such fibers for the production of thermal insulation materials (felts, cords and blocks) instead of currently existing materials made of aluminum oxide-based fibers can significantly increase the operating temperatures of the thermal protection systems.

Combustion Synthesis of Alumina-Based Multiphase Foam Ceramic

2008 ◽  
Vol 368-372 ◽  
pp. 1526-1528 ◽  
Author(s):  
Jun Shou Li ◽  
Liang Li ◽  
Jian Jiang Wang ◽  
Bing She Xu ◽  
Yu Jun Yin
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Combustion Synthesis ◽  
Influencing Factors ◽  
Direct Observation ◽  
Compression Strength ◽  
Pore Diameter ◽  
Foaming Agent ◽  
Temperature Resistance ◽  
Foam Ceramic

Al2O3-TiO-TiO2 multiphase foam ceramic was prepared with Al powders and TiO2 powders by combustion synthesis, Direct observation and metallographic microscope indicated that the pore diameter is 100~6000μm, and Archimedean method showed that the porosity is 35~50%. The influencing factors of the pore diameter and porosity and, the effects of adding SiO2 on compression strength of the Al2O3- TiO-TiO2 multiphase foam ceramic were discussed. It was shown that the addition of proper high temperature foaming agent can increase porosity and adding SiO2 can decrease porosity. The Al2O3-TiO-TiO2 multiphase foam ceramic has good mechanical properties and high-temperature resistance.

Study of Carbon Aerogel Composites for Thermal Protection Applications

2020 ◽  
Vol 845 ◽  
pp. 9-14
Author(s):  
Hui Guo ◽  
Li Jun Su ◽  
Wen Jing Li ◽  
Ying Min Zhao
Keyword(s):  
High Temperature ◽  
Pore Structure ◽  
Thermal Insulation ◽  
Thermal Protection ◽  
Carbon Aerogel ◽  
Inert Atmosphere ◽  
Condensation Polymerization ◽  
Temperature Resistance ◽  
High Temperature Resistance ◽  
Adsorption Desorption

Carbon aerogel composites have been prepared by condensation polymerization and high temperature pyrolysis. The morphology of carbon aerogel is characterized by SEM. The pore structure is characterized by N2 adsorption-desorption technique. The thermal insulation properties of carbon aerogel composites are tested. Carbon aerogel composites show good thermal insulation and high temperature resistance in inert atmosphere The results show that they are suitable for applications in aerospace thermal protection industry.

Synthesis and Structural Characterization of SiO2-Al2O3 Xerogels

2007 ◽  
Vol 336-338 ◽  
pp. 2286-2289
Author(s):  
Fei He ◽  
Xiao Dong He ◽  
Yao Li
Keyword(s):  
Structural Change ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Mesoporous Structure ◽  
Supercritical Drying ◽  
High Specific Surface Area ◽  
Molar Ratio

Low-density xSiO2-(1-x)Al2O3 xerogels with x=0.9, 0.8, 0.7, 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying. Silica alkogels, which were the framework of binary composite materials, formed from tetraethyl orthosilicate (TEOS) by hydrolytic condensation with a molar ratio of TEOS: H2O: alcohol: hydrochloric acid: ammonia =1: 4: 10: 7.5×10-4: 0.0375. Aluminum hydroxide derived from Al(NO3)3·9H2O and NH4OH acting in the alcohol solution under the condition of catalyst. After filtrating and washing, the precipitation was mixed into silica sols to form SiO2-Al2O3 mixed oxide gels with different silicon and aluminum molar ratio. The structural change and crystallization of the binary xerogels were investigated after heat treatment at 600 for 2 h by the means of X-ray diffraction. Nitrogen adsorption experiment was performed to estimate specific surface area, porous volume and pore size distribution. The structural change of xerogels was observed by FT-IR spectroscopy. The resulting mixed xerogels possess of mesoporous structure which is characteristic of cylindrical pores, high specific surface area of 596-863 m2/g and a relatively narrow pore distribution of 2.8-30 nm. Al2O3 is introduced into the SiO2 phase and some of Al-O-Si bonds form.

Thermal Treatment of New Inorganic Thermal Insulation Board Based on Expanded Perlite

2012 ◽  
Vol 560-561 ◽  
pp. 249-253 ◽  
Author(s):  
Blaž Skubic ◽  
Mitja Lakner ◽  
Igor Plazl
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Thermal Treatment ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Temperature Treatment ◽  
Microwave Drying ◽  
High Temperature Treatment ◽  
Expanded Perlite ◽  
The Right

A new lightweight thermal insulation board, containing expanded perlite and inorganic silicate binder with corresponding industrial production procedure was developed. The industrial technology was developed in cooperation between company Trimo d.d. and Faculty of chemistry and chemical technology Ljubljana and among others includes mixing of raw materials, molding, microwave drying and high temperature treatment of the dried board. A new product has low density (130 – 160 kg/m3), good mechanical properties and durability and can be used in various fields where inorganic thermal insulation is required. The current work presents the experimental study of the final process during plate production – high temperature treatment with sintering. During thermal treatment of the board, certain shrinkage is required to obtain sufficient mechanical properties and durability. Controlling the process of high temperature thermal treatment is the key to achieve the right balance between low final density of the board and its good mechanical properties.

Thermo-Mechanical Properties of Geopolymer/Carbon Fiber/TiO2 Nanoparticles (NPs) Composite

2019 ◽  
Vol 967 ◽  
pp. 267-273
Author(s):  
Subaer ◽  
Abdul Haris ◽  
Noor Afifah Kharisma ◽  
Nur Akifah ◽  
Risna Zulwiyati
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Properties ◽  
High Temperature ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Experimental Results ◽  
Temperature Resistance ◽  
Cleaning Agent ◽  
High Temperature Resistance

The main objective of this study is to investigate the thermo-mechanical properties of composite made from geopolymer/carbon fiber/TiO2 NPs. The composite was fabricated from geopolymer based on metakaolin added with carbon fibers as reinforcement and TiO2 NPs as self-cleaning agent. The thermal properties of the composite was examined by subjecting the samples to temperature up to 750OC for 4 hours. The mechanical properties of the resulting materials were measured by using flexural and tensile strength measurements. The experimental results showed that the compsite exhibited high temperature resistance and the addition of carbon fiber were increase the flexural as well as the tensile strength of the composite.

Sign in / Sign up

Export Citation Format

Share Document