Details:

Personal Author:
Wittmer, Dale E. ;
Corporate Authors:
United States. Bureau of Mines. ;
Description:
"Nonoxide ceramic materials could substitute for high-temperature alloy steels containing imported critical and strategic materials such as cobalt, chromium, and nickel if their high-temperature properties can be improved. An important result of this substitution would be a reduction of the nation's need for imports of critical and strategic materials. In this Bureau of Mines investigation, the primary objective was to produce high-purity ultrafine (particles < 5 um equivalent spherical diameter (esd)) alpha-silicon carbide (alpha-SiC) powders with improved high-temperature properties using the Bureau's patented turbomilling process. A secondary objective was to determine the feasibility of using polymer mill construction materials as a means of eliminating metal contamination from the turbomill. Ultrafine alpha-SiC powders with Brunauer-Emmett-Teller surface areas from 30 to 35 m2/g ( 0.06 microm particle esd) were produced in an all-polymer turbomill. These high-purity powders (with 1-pct B and 1-pct C additions) hot-pressed to greater than 99 pct of their optimal density and exhibited properties commensurate with those of commercially available alpha-SiC. The most promising of the construction materials tested for the major wear surfaces of the turbomill was ultra-high-molecular-weight polyethylene, a polymer thermoplastic." - NIOSHTIC-2 NIOSH no. 10003358
Subject:
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Ceramic Powders.
Powders.
Size Reduction Of Materials.

Document Type:
Report ;
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:90be2a8934658cdbf187fd0eaeb770b89a7236233c51b97adcda82f2963e1a9e
File Type:

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