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Silicon carbide whiskers: characterization and aerodynamic behaviors.

Authors
Cheng-S; Powell-QH; Smith-SM; Johnson-NF
Source
Am Ind Hyg Assoc J 1995 Oct; 56(10):970-978
NIOSHTIC No.
00238997
Abstract
An analysis was undertaken of the physical and aerodynamic properties of silicon-carbide (409212) (SiC) whiskers to assess their potential as an occupational health hazard. Industrial grade SiC fibers (density 3.25+/-0.006 grams per cubic meter, surface area 1.4+/-0.1 square meters per gram) were dispersed into a stainless steel chamber at a flow rate of 22.5 liters per minute (l/min) using a small scale power disperser. Aerosol samples were collected through a mixed cellulose-acetate/cellulose-nitrate filter (25 millimeters, 0.3 micrometer pore, flow rate 2l/min) and a cascade impactor (flow rate 12l/min) to determine aerosol concentration. Electron microscopic analysis was performed to measure fiber dimension and morphology. Particle sizes were determined after samples were separated via a Lovelace aerosol particle separator. SiC particle sizes ranged from 0.65 to 1.9 micrometers. The majority of SiC whiskers were straight and rod shaped, although single bends (12%) and double bends (2.7%) were also observed. A log normal distribution of SiC whisker length and width was noted. Fiber axis orientation was shown to influence fiber aerosol aerodynamic size. Aerodynamic size distribution estimates from data collected using the cascade impactor were smaller than those from data collected with the aerosol centrifuge.
Keywords
NIOSH-Publication; NIOSH-Grant; Respirators; Silicon-compounds; Fibrous-dusts; Dust-analysis; Particle-aerodynamics; Aerosol-sampling; Occupational-hazards
Contact
Aerosol Science Lovelace Biomed & Environ Res PO Box 5890 Albuquerque, NM I 87185
CODEN
AIHAAP
CAS No.
409-21-2
Publication Date
19951001
Document Type
Journal Article
Funding Amount
357145.00
Funding Type
Grant
Fiscal Year
1996
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02922
Issue of Publication
10
ISSN
0002-8894
Priority Area
Respirator Research; Respirators
Source Name
American Industrial Hygiene Association Journal
State
NM
Performing Organization
Lovelace Institutes, Albuquerque, New Mexico
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