Temperature distribution in microwave sintering of alumina cylinders

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Description

Small cylinders of high-purity alumina were encased in a `casket` of low-density zirconia insulation and heated to sintering temperature in a large multi-mode microwave oven. Optical fiber sensors were used to monitor the temperature at several locations in the system. It was found that the alumina samples heat faster than the zirconia insulation at temperatures above 1000 C, and that the temperature distribution in the sample is essentially uniform during the heating process. A two-dimensional mathematical model of the heat transfer process was developed which reproduces the essential features of the observed phenomena. Literature data for all temperature-dependent properties were ... continued below

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6 p.

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Thomas, J. R. Jr.; Katz, J. D. & Blake, R. D. April 1, 1994.

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Description

Small cylinders of high-purity alumina were encased in a `casket` of low-density zirconia insulation and heated to sintering temperature in a large multi-mode microwave oven. Optical fiber sensors were used to monitor the temperature at several locations in the system. It was found that the alumina samples heat faster than the zirconia insulation at temperatures above 1000 C, and that the temperature distribution in the sample is essentially uniform during the heating process. A two-dimensional mathematical model of the heat transfer process was developed which reproduces the essential features of the observed phenomena. Literature data for all temperature-dependent properties were incorporated into the model. The model suggests that the alumina samples absorb a significant fraction of the microwave energy.

Physical Description

6 p.

Notes

OSTI as DE94009335; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

Source

  • Spring meeting of the Materials Research Society (MRS),San Francisco, CA (United States),4-8 Apr 1994

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  • Other: DE94009335
  • Report No.: LA-UR--94-1053
  • Report No.: CONF-940411--3
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/10139057 | External Link
  • Office of Scientific & Technical Information Report Number: 10139057
  • Archival Resource Key: ark:/67531/metadc1312947

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Creation Date

  • April 1, 1994

Added to The UNT Digital Library

  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 13, 2018, 2:32 p.m.

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Thomas, J. R. Jr.; Katz, J. D. & Blake, R. D. Temperature distribution in microwave sintering of alumina cylinders, report, April 1, 1994; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1312947/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.