Ceramic Oxide Fiber

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:

References

1. Lei Li, et al. Chemical Engineering Journal, 2021, 421, Part 2, 127744.
2. Boris Mahltig, et al. Inorganic and Composite Fibers, 2018, 165-193.

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