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Use of Bureau of Mines turbomill to produce high-purity ultrafine nonoxide ceramic powders

Public Domain
File Language:
English


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

  • Subjects:
  • Series:
    Mining Publications
  • Subseries:
    Report of Investigations
  • Document Type:
    Text
  • Genre:
    Report
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    12 numbered pages
  • NIOSHTIC Number:
    nn:10003358
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:e42bf4386c4de7e507d84948107232c32e4f185e8861b14d5d8b487509010cf3251d10a176152c968e8ed3cf593898993e7218ffa4013113ef11292c432a2d4c
  • Download URL:
  • File Type:
    Filetype[PDF - 6.33 MB ]
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