oxide fibres (rus. волокна, оксидные) — structural fibres containing oxides as the main component.

Description

There are two known types of oxide fibres used primarily as a reinforcing material for high-temperature composites: monocrystalline and eutectic wires and rods, and nanostructured filaments. Fibres of the first type are produced by means of melt crystallisation using the methods based on Stepanov’s concept (Edge-defined Film-fed Growth (EFG) and micropulling-down), LHPG (Laser Heated Pedestal Growth), and the internal crystallisation method. Fibres of the second type are produced using the traditional procedures of powder metallurgy (slurry, sol-gel).

Single-crystal and eutectic fibres are stable at high temperatures and are characterised by high creep resistance. For example, mullite fibre (2Al2O3∙SiO2) and yttrium aluminium garnet (YAG, Y3Al5O12) are creep resistant at temperatures up to 1,600°C.

Polycrystalline fibres recrystallise at high temperatures and lose their original nanocrystalline structure at temperatures of 1,100-1,300°C, depending on the composition and exposure time. The most creep resistant fibres, consisting of aluminium oxide and mullite, can be used over the long haul at temperatures up to 1,300°C.

Oxide fibres are used in composites with nickel and oxide matrices. Inexpensive fibres with low tensile strengh can be used as thermoisolators.

Authors

  • Lourie Sergey
  • Mileiko Sergey T.

Sources

  1. Concise Encyclopedia of Composite Materials / Ed. by A. Kelly. — Elsevier Science, 1994. — 378 p.
  2. Chawla K. K. Fibrous Materials. — Cambridge University Press, 1998. — 309 p.
  3. Handbook of Composites. V. 1: Strong Fibers Ed. by W. Watt, B.V Petrov. — N.Y.: Elsevier, 1989.
  4. Milejjko S. T., Serebrjakov A. V., Kijjko V.M. et al. Single-crystal mullite fibers, obtained by the internal crystallization (in Russian) // Kompozity i Nanostruktury. 2009. №2. p. 47–60.
  5. Mileiko S. T. Single crystalline oxide fibres for heat-resistant composites // Compos. Sci. and Technol. 2005. V. 65, №15–16. P. 2500–2513.

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