Silicon carbide fiber is a kind of inorganic fibers obtained by spinning, carbonization or vapor deposition from organosilicon compounds. Alfa Chemistry offers silicon carbide fibers to meet your high performance material needs.
Classification
Silicon carbide (SiC) fibers can be divided into whiskers and continuous fibers according to their morphology. SiC whisker is a single crystal, which is generally 0.1-2μm in diameter, 20-300μm in length, and powdery in appearance. While continuous SiC fiber is a polycrystalline fiber, which is mainly produced by vapor deposition (CVD) and precursor wire methods.
Features
The maximum use temperature of SiC fiber can reach 1200 °C, and its heat resistance is better than carbon fiber. The fiber strength is 1960 ~ 4410 MPa, the strength retention rate is above 80% at the highest use temperature, and the modulus is 176.4 ~ 294 GPa. In addition, SiC fibers also have excellent chemical stability, including corrosion resistance, oxidation resistance, etc.
Preparation Methods
The preparation methods of SiC fibers include:
- Organic precursor conversion
- Chemical vapor deposition
- Ultrafine powder sintering
- Activated carbon fiber conversion
Among them, the organic precursor conversion method is a method in which organic polymers are used as precursors, and after being formed by their soluble or fusible properties, they are processed at high temperature to convert organic substances into inorganic materials. It is worth noting that the organic precursor conversion method to prepare SiC fibers has significant advantages, including controllable molecular design, easy molding, high production efficiency and low cost.
Applications
- High Performance Material
SiC fibers are often used as high temperature resistant materials, such as heat shielding materials, high temperature resistant conveyor belts, filter cloths for filtering high temperature gas or molten metal, etc. Besides, SiC fibers are also used in combination with carbon fibers or glass fibers as reinforcing materials, for example in the production of metal matrix composites (Al, Ti or Mo composites, etc.). The SiC fiber based composites exhibit attractive potential for applications in extreme conditions such as aerospace. - Nuclear Application
Silicon carbide materials have been extensively studied for the goal of achieving higher thermal efficiency in nuclear power systems due to their good neutron and high temperature properties. Among them, SiC fiber composite materials can be used in radiation-resistant materials for nuclear power plants and nuclear fusion devices. - Absorber
SiC fiber, a traditional semiconductor fiber that causes microwave energy loss, can be used to form composites by using general resin systems without lossy additives. Jae-Hun Choi et al. discussed the properties of SiC fiber-reinforced composites as microwave absorbers and investigated the mechanical and electromagnetic properties of SiC/epoxy composites. In this work, the −10-dB bandwidth and the minimum return loss of the four-slab absorber were 3.4 GHz and −31.0 dB, respectively. [1]
(a) Schematic of four-slab absorber and (b) comparison of simulation and experiment results of the absorber.
Reference
- Jae-Hun Choi, et al. Composite Structures, 2018, 202, 290-295.
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