Typical compositions of ceramic oxide fibers are Al2O3, Al2O3/SiO2 or Al2O3/SiO2/B2O3 mixtures. Alfa Chemistry offers high quality ceramic oxide fibers for applications in high temperature oxidizing environments.
Typical Products
- Alumina Fiber
The most widely studied and applied oxide ceramic fibers are Al2O3-based fibers, with Al2O3 as the main component and a small amount of SiO2, B2O3, ZrO2, MgO and other components. They not only have high strength, but also have a series of characteristics such as low thermal conductivity and corrosion resistance. This kind of fiber has excellent high temperature oxidation resistance and can be used in high temperature occasions above 1400 °C.
Some cutting-edge studies have prepared new ultrafine Al2O3 fiber-based materials, such as Al2O3-based MOFs, three-dimensional Al2O3 aerogels, etc. Crystalline Al2O3 generally has nine crystal forms (α, β, γ, δ, η, θ, κ, ρ, χ), and γ and α Al2O3 fibers are widely used at present. γ- Al2O3 fibers have the characteristics of porosity, large specific surface area, and strong adsorption performance, which can be used to remove pollutants or industrial catalyst carriers. α-Al2O3 fibers have stable structure, high temperature resistance and wear resistance, and can be used in fire and heat insulation, sound absorption, battery separator and other fields. The hot areas of application of ultrafine alumina fibers are summarized in the figure below. [1]
- Silica Fiber
Compared with glass fiber, silica fiber is also called high-purity SiO2 fiber. Silica fibers can be produced by melt spinning. - Alumina Silica Fiber
Alumina silica fibers are also commonly referred to as aluminosilicate fibers. There are mainly two types of aluminosilicate fibers, distinguished by their Al2O3 content. Melt spinning can produce fibers with Al2O3 content of 45% to 60%. Due to the high melting point and low viscosity of molten Al2O3, fibers with higher Al2O3 contents cannot be produced by melt spinning. A suitable method for producing aluminosilicate fibers by the sol-gel process involves combining inorganic components in the sol with an organic polymer. A schematic diagram of the reaction leading to the formation of the aluminosilicate sol is shown below. [2]
- Other Ceramic Oxide Fibers
Other ceramic oxide fibers include zirconia fibers (ZrO2), magnesium oxide fibers (MgO), yttrium oxide fibers (Y2O3), titanium dioxide fibers (TiO2), and so on.
Properties And Features
A summary of ceramic oxide materials and their melting point or decomposition temperature is shown in the right figure. Ceramic oxide fibers have the following characteristics:
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High temperature strength
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Good thermal shock resistance
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Low thermal conductivity
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High thermal shock resistance
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Low thermal expansion coefficient
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High creep resistance
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High dimensional stability
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Good dielectric properties
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Good sound absorption
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Good insulation performance
References
- Lei Li, et al. Chemical Engineering Journal, 2021, 421, Part 2, 127744.
- Boris Mahltig, et al. Inorganic and Composite Fibers, 2018, 165-193.
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