Silicon carbide (SiC) nanofiber

Catalog	ACM409212-16
CAS	409-21-2
Structure
Description	nanofiber, D <2.5 μm, L/D ≥ 20, 98% trace metals basis
Synonyms	Silicon carbide fibers, Silicon carbide nanowhiskers, Silicon carbide whiskers
Molecular Weight	40.1
Molecular Formula	SiC
Canonical SMILES	[C-]#[Si+]
InChI	1S/CSi/c1-2
InChI Key	HBMJWWWQQXIZIP-UHFFFAOYSA-N
Melting Point	2700 °C (lit.)
Density	3.22 g/mL at 25 °C (lit.)
Application	Silicon carbide nanofibers are used with aluminum metal ceramic composites and ceramic composites to increase strength and reduce stress. Silicon carbide nanowhiskers can also be used in biocomposites for bone repair.
Storage	Storage Class Code; 6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
Assay	98% trace metals basis
Form	nanofiber
MDL Number	MFCD00049531
Packaging	25 g in poly bottle

Case Study

Performance Evaluation of Epoxy/Silicon Carbide Nanofiber Composites

Vijayan P, Poornima, et al. Polymers for Advanced Technologies, 2015, 26(2), 142-146.

The study explored how various amounts of silicon carbide (SiC) nanofibers (0.1 phr, 0.25 phr, and 0.5 phr) affected an epoxy matrix that was cured using an anhydride curing agent.
Key Findings
• Morphological investigations demonstrated that epoxy/SiC nanofiber composites show better dispersion and adhesion when using low SiC nanofiber loadings of 0.1 and 0.25 phr.
• The composite material that included 0.25 phr of SiC nanofibers demonstrated superior flexural strength and elongation at break together with the highest fracture toughness. The epoxy matrix received optimal debundling through the effective incorporation of SiC nanofibers which resulted in significant matrix shear yielding for epoxy/0.25 phr SiC nanofiber composites.
• In these low SiC nanofiber loaded composites (0.1 and 0.25 phr), local stress was efficiently transferred to the tougher SiC nanofibers.
• The epoxy/0.5 phr SiC nanofiber composites showed reduced fracture toughness due to poor dispersion and debundling of the fibers.
• Thermogravimetric analysis revealed the composites with SiC nanofiber loadings of 0.1 and 0.25 phr showed better thermal stability.

Silicon Carbide Nanofibers for Interface Modification of Carbon Fiber Reinforced Carbon Composites

Chen, Jie, et al. Materials & Design, 2015, 84, 285-290.

Carbon nanofiber (CNF) is a quasi-one-dimensional material characterized by a unique structure. It is employed to modify the interface of carbon fiber reinforced carbon (C/C) composites by adjusting the microstructure at the interface. In this study, silicon carbide nanofibers (SiCNFs) are uniformly applied to the surface of a unidirectional carbon preform for this modification. The modified preform undergoes densification through chemical vapor deposition (CVD) to produce SiCNF-C/C composites.
Performance of SiCNF-C/C Composites
• The performance of SiCNF-C/C composites is enhanced due to the distinctive structure of SiCNFs, which act as active sites that promote ordered deposition of PyC during the CVD process. The incorporation of SiCNFs creates a granular interface layer between the carbon fibers and the matrix, resulting in a highly textured structure of PyC around the interface. This modification alters the fracture behavior of SiCNF-C/C composites, giving them pseudo-plastic fracture characteristics.
• SiCNF-C/C composites demonstrate enhanced flexural strength with 43% greater strength vertically and 100% improvement directionally parallel compared to standard C/C composites. Through microstructure optimization modified composites experience diminished thermal resistance and scattering centers which improves their thermal conductivity, especially perpendicular to the material.