Boron fibers refer to a class of inorganic fibers formed by depositing boron on metal wires, which are actually composite fibers. Alfa Chemistry offers boron fibers to meet the challenges of lightweight and high-strength materials.
Typical Categories
- Boron Fiber
Boron fibers have a crystallite structure commonly referred to as amorphous because the characteristic X-ray diffraction pattern shows a typical amorphous material. However, amorphous boron fibers are actually composed of 2 nm nanocrystalline phases. The boron fibers display a fiber surface morphology similar to a "corncob" structure, which consists of nodules separated by boundaries. [1]
The boron fibers are obtained by CVD technique. Usually, high melting point metal tungsten is used as the substrate, and boron trihalide (BX3) is reduced on the surface of the substrate at high temperature under hydrogen. The reaction of boron deposition on the tungsten filament core (12 microns in diameter) is shown as follow.
- Boron Nitride Fiber
The bond energy of the B-N bond in the boron hydride fiber is very high, so the fiber has high heat resistance, does not soften in an inert gas at 2800 °C, and the strength is twice that of room temperature at 1800 °C. In addition, boron nitride fiber also has high thermal conductivity, low thermal expansion coefficient (the lowest among ceramic fibers), high thermal conductivity, thermal shock resistance, excellent high temperature insulation, low dielectric loss, good corrosion resistance properties, low friction factor, etc. The preparation method of boron nitride fiber includes organic precursor method and inorganic precursor method. - Boron Carbide Fiber
Many properties of boron carbide make it attractive in fiber form. These include high strength, high elastic modulus, low density, chemical stability, excellent thermal shock resistance and good oxidation resistance. Furthermore, due to its high electrical resistivity and high thermal conductivity, boron nitride can be used in a variety of applications, especially in the electrical and electronic fields. Boron carbide (B4C) fibers can be prepared by CVD technique or directly from B4C powder. The latter produces green fibers by first preparing a cellulose-based viscose mixture, dispersing the powder to form a boron carbide slurry, and then spinning the slurry. [2]
Applications
- Boron Fiber
Boron fibers have high durability, high tensile strength, high compressive strength, high modulus and low density. This structure allows boron fibers to be used in a wide range of applications, from more technical applications such as aerospace and aircraft to more commercial industrial applications. - BN fiber for water treatment
Porous boron nitride (BN) composed of light elements has unique B-N bond polarity, high specific surface area, numerous structural defects, chemical stability, and oxidation resistance, and is considered a promising candidate for pollution treatment. Jie Li et al. developed well-crystallized porous BN fibers to enhance the removal of cationic dyes. [3]
TEM images of the BN fiber and the activated BN.
References
- Jan -Otto Carlsson. Journal of Materials Science, 1979, 14, 255–264.
- Emre Yalamaç, et al. Fiber Technology for Fiber-Reinforced Composites, 2017, 187-207.
- Jie Li, et al. J. Mater. Chem. A, 2015,3, 8185-8193
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