Silicon carbide (SiC) nano and sub-micron powder, high purity alpha and beta crystals


	$Refractories$

Crystalline Silicon Carbide nano and sub-micron Powder

Green alpha and beta silicon carbide powder

for silicon carbide nano whiskers, visit: www.alphamaterials.com/SiC_whiskers.htm

Benefits & Potentials

Properties

Microscopy Data

X-ray Data

Our clients include U.S. major corporations and research institutes in aerospace, energy and microelectronic industries.



Photos are courtesy of NASA, Sandia National Lab, U.S. Dept. of Energy and Clinton White House Archive. They are shown for inspirations only, and do not necessarily reflect relations (or lack there of) with the organizations.

Nano Crystalline Silicon Carbide Offer Superior Properties:

	extreme hardness (25-50 GPa bulk and film indentation hardness [ref. 1, 2])
	large semiconductor bandgap (2-3 times larger than silicon [ref. 3])
	high electric breakdown field (3-5 times larger than Si [ref. 3])
	high thermal conductivity (~390 W/m.K for crystals [ref. 4], ~30 W/m.K for SiC-fiber/SiC-matrix composite [ref. 5, 6])
	high specific stiffness (about 3 times larger than Si [ref. 7])
	high temperature stability

Potential Applications:

	mechanical reinforcement for fracture and wear resistance.
	high power and microwave electronics
	nanoelectromechanical systems (NEMS)

Properties:

alpha silicon carbide powder		beta silicon carbide powder
crystal structure	hexagonal, rhombohedral	crystal structure	cubic
average particle size	0.5 microns	average particle size	50 nanometer
SiC %	≥ 99%	microscopy & X-Ray	TEM, XRD
Fe₂O₃ %	≤ 0.05%	purity	> 99.0 %
F.C.	≤ 0.10%	Si free ions %	< 0.2 %
		Cl %	< 0.09 %
		total oxide %	< 0.61 %
		density	3.21 g/cm³
		packing density	0.05 g/cm³
		surface area	> 90 m²/g
		Moh's hardness	9.5 - 9.75
		NOTE: average particle size of 300 nm is also available

Beta Silicon Carbide Powder: TEM, Transmission Electron Microscopy

50 nm particle size	300 nm particle size

Beta Silicon Carbide Powder: XRD, X-Ray Diffractometry

XRD: beta silicon carbide powder

References:

1. Liao, et. al., Applied Physics Letters, 86, 171913 (2005)

2. Vassen, et. al., J. Am. Ceram. Soc., 82, 2585 (1999)

3. Neudeck, J. Electronic Materials, 24, 283 (1995)

4. Burgemeister, et. al., J. Applied Physics, 50, 5790 (1979)

5. Donaldson, et. al., J. Am. Ceram. Soc., 81, 1583 (1998)

6. Katoh, et. al., Ceramic Transactions, 144, 77 (2002)

7. Yang, et. al., Applied Physics Letters, 78, 162 (2001)

Note: Final properties of a silicon carbide film or shape depend on the preparation technique and conditions.