Boron fiber
Boron Fiber (also commonly called "boron filament") is an amorphous elemental boron product which represents the major industrial use of elemental (free) boron. Boron fiber manifests a combination of high strength and high elastic modulus.
A common use of boron fibers is in the construction of high tensile strength tapes. Boron fiber use results in high-strength, lightweight materials that are used chiefly for advanced aerospace structures as a component of composite materials, as well as limited production consumer and sporting goods such as golf clubs and fishing rods.[1][2]
One of the uses of Boron Fiber Composites was the horizontal tail surfaces of the F-14 "Tomcat" fighter. This was done, as Carbon Fiber Composites were not yet developed to the point they could be used, as they were in many of aircraft designs since. [ https://www.compositesworld.com/articles/boron-fiber-the-original-high-performance-fiber ]
In the production process, elemental boron is deposited on an even tungsten wire substrate which produces diameters of 4.0 mil (102 micron) and 5.6 mil (142 micron). It consists of a fully borided tungsten core with amorphous boron.[3][4][5]
Boron fibers and sub-millimeter sized crystalline boron springs are produced by laser-assisted chemical vapor deposition. Translation of the focused laser beam allows to produce even complex helical structures. Such structures show good mechanical properties (elastic modulus 450 GPa, fracture strain 3.7%, fracture stress 17 GPa) and can be applied as reinforcement of ceramics or in micromechanical systems.[6]
| Identifiers | |
|---|---|
| ChemSpider |
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| Properties | |
| Density | 2.48-2.82 g/cc |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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References
- ^ Herring, H. W. (1966). "Selected Mechanical and Physical Properties of Boron Filaments" (PDF). NASA. Retrieved 2008-09-20.
- ^ Layden, G. K. (1973). "Fracture behaviour of boron filaments". Journal of Materials Science. 8 (11): 1581–1589. Bibcode:1973JMatS...8.1581L. doi:10.1007/BF00754893. S2CID 136959123.
- ^ Kostick, Dennis S. (2006). "Mineral Yearbook: Boron" (PDF). United States Geological Survey. Retrieved 2008-09-20.
- ^ Cooke, Theodore F. (1991). "Inorganic Fibers—A Literature Review". Journal of the American Ceramic Society. 74 (12): 2959–2978. doi:10.1111/j.1151-2916.1991.tb04289.x.
- ^ "Boron Fiber". Specialty Materials. Archived from the original on 2014-08-12.
- ^ Johansson, S.; Schweitz, Jan-Åke; Westberg, Helena; Boman, Mats (1992). "Microfabrication of three-dimensional boron structures by laser chemical processing". Journal of Applied Physics. 72 (12): 5956–5963. Bibcode:1992JAP....72.5956J. doi:10.1063/1.351904.
