Microwave hybrid heating of alumina filaments

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Low loss oxide ceramics filaments are not readily heated to sintering temperatures (>900{degrees}C) by direct microwave heating at 2.45 GHz. Use of high power levels typically yields thermal runaway with catastrophic melting. In other studies, hybrid, or indirect, heating has been successfully applied to processing bulk oxide ceramics. In this work, commercial alumina-based filaments have been indirectly heated to 700{degrees}--900{degrees}C through a lossy carbon coating on the filament tow. Specific filaments can reach higher temperatures by direct coupling after preheating with a lossy coating. The results of microwave hybrid heating in a single mode TE{sub 102} cavity will be described ... continued below

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14 p.

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Vogt, G. J. & Unruh, W. P. May 1, 1993.

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Description

Low loss oxide ceramics filaments are not readily heated to sintering temperatures (>900{degrees}C) by direct microwave heating at 2.45 GHz. Use of high power levels typically yields thermal runaway with catastrophic melting. In other studies, hybrid, or indirect, heating has been successfully applied to processing bulk oxide ceramics. In this work, commercial alumina-based filaments have been indirectly heated to 700{degrees}--900{degrees}C through a lossy carbon coating on the filament tow. Specific filaments can reach higher temperatures by direct coupling after preheating with a lossy coating. The results of microwave hybrid heating in a single mode TE{sub 102} cavity will be described for commercial alumina-based filaments.

Physical Description

14 p.

Notes

OSTI; NTIS; GPO Dep.

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  • 95. annual meeting of the American Ceramic Society,Cincinnati, OH (United States),18-22 Apr 1993

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  • Other: DE93012642
  • Report No.: LA-UR--93-1306
  • Report No.: CONF-930438--9
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 10158514
  • Archival Resource Key: ark:/67531/metadc1389041

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1993

Added to The UNT Digital Library

  • Nov. 28, 2018, 2:33 p.m.

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  • Dec. 7, 2018, 3:38 p.m.

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Vogt, G. J. & Unruh, W. P. Microwave hybrid heating of alumina filaments, article, May 1, 1993; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1389041/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.