Flame Synthesis Of High Purity, Nanosized Crystalline Silicon Carbide Powder

1995 ◽  
Vol 410 ◽  
Author(s):  
D. G. Keil ◽  
H. F. Calcote ◽  
R. J Gill
Keyword(s):  
Silicon Carbide ◽  
Crystalline Silicon ◽  
Flame Synthesis ◽  
Carbide Powder ◽  
Air Exposure ◽  
Precise Control ◽  
Metal Impurities ◽  
High Yields ◽  
Silicon Carbide Powder

ABSTRACTSelf-propagating flames in pure silane-acetylene mixtures produce silicon carbide (SiC) powder and hydrogen as main products. Through precise control of the stoichiometry of the reactant gas mixture, it has been possible to produce white SiC at high yields. Characterization of such powders by TEM has shown that the nascent powder consists of polycrystalline hexagonal plates with a narrow size distribution (40 ± 7 nm diameter). Infrared spectroscopy of powders indicate microcrystalline SiC and little bound hydrogen. Chemical analysis by the ANSI method showed the powder to be >96 wt % SiC with an impurity of silica (3.9 weight %) due to air exposure of the powder. Traces (0.1 to 0.2 weight %) of both free carbon and free silicon were found. Metal impurities detected by SIMS were typically low: less than 10 ppba for aluminum, sodium, titanium and vanadium. Boron was observed at 10 ppma. Like the oxygen, the boron impurities are probably associated with exposure of the powders to the atmosphere.

A Study of Preparation and Characterization of Nano-Sized SiC Powder Using High Energy Ball Milling

2014 ◽  
Vol 592-594 ◽  
pp. 13-17
Author(s):  
S. Manikandan ◽  
J. Jancirani
Keyword(s):  
Silicon Carbide ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Carbide Powder ◽  
Powder Particles ◽  
Energy Ball ◽  
Steel Balls ◽  
Silicon Carbide Powder

This study investigated the preparation of nanosized crystalline SiC powders from micro sized Silicon Carbide powder at room temperature through high energy ball milling. Silicon carbide was milled with hardened steel balls and ball milling media under identical conditions of ball mass to powder mass ratio 10:1 and target milling times of 60 h. The sample was taken out after every 20 hours of milling and it was characterized for its crystalline size, lattice strain, and percentage of crystalline by using X-Ray Diffractometer (XRD). It was found that for the 60 hours The size, shape and texture of the fresh as well as nanostructured Silicon carbide powder were studied using Scanning Electron Microscopy (SEM). The raw Silicon carbide powder particles were mostly angular in shape. The shape of the 60h milled particles is irregular and the surface morphology is rough.

Fabrication of silicon carbide nanoceramics

1996 ◽  
Vol 11 (7) ◽  
pp. 1601-1604 ◽  
Author(s):  
Mamoru Mitomo ◽  
Young-Wook Kim ◽  
Hideki Hirotsuru
Keyword(s):  
Silicon Carbide ◽  
Particle Size ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Average Particle Size ◽  
Liquid Phase Sintering ◽  
Carbide Powder ◽  
Average Particle ◽  
Average Grain Size ◽  
Silicon Carbide Powder

Ultrafine silicon carbide powder with an average particle size of 90 nm was densified by hot-processing with the addition of Al2O3, Y2O3, and CaO at 1750 °C. Silicon carbide nanoceramics with an average grain size of 110 nm were prepared by liquid phase sintering at low temperature. The materials showed superplastic deformation at a strain rate of 5.0 × 10-4/s at 1700 °C, which is the lowest temperature published. The microstructure and deformation behavior of materials from a submicrometer powder were also investigated as a reference.

Sign in / Sign up

Export Citation Format

Share Document