Diffusion-controlled processes in microwave-fired oxide ceramics

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Processing oxide-based ceramics using microwave heating leads to a number of unexpected results, which can only be interpreted in terms of enhanced diffusion. Enhanced sintering has been observed in alumina and zirconia. Accelerated grain growth in dense, hot-pressed alumina has been demonstrated. Increased diffusion coefficients have been observed for diffusion of oxygen in sapphire. As yet, a satisfactory theory to account for these phenomena has not been developed. This paper reviews the experimental work conducted at the Oak Ridge National Laboratory during the past four years on the processing of oxides in both 2.45 and 28 GHz microwave furnaces. 18 ... continued below

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Janney, M.A. & Kimrey, H.D. January 1, 1990.

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Description

Processing oxide-based ceramics using microwave heating leads to a number of unexpected results, which can only be interpreted in terms of enhanced diffusion. Enhanced sintering has been observed in alumina and zirconia. Accelerated grain growth in dense, hot-pressed alumina has been demonstrated. Increased diffusion coefficients have been observed for diffusion of oxygen in sapphire. As yet, a satisfactory theory to account for these phenomena has not been developed. This paper reviews the experimental work conducted at the Oak Ridge National Laboratory during the past four years on the processing of oxides in both 2.45 and 28 GHz microwave furnaces. 18 refs., 10 figs.

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Pages: (13 p)

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OSTI; NTIS; GPO Dep.

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  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 16-21 Apr 1990

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  • Other: DE92002052
  • Report No.: CONF-900466-103
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5193919
  • Archival Resource Key: ark:/67531/metadc1052772

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1990

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:16 p.m.

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Janney, M.A. & Kimrey, H.D. Diffusion-controlled processes in microwave-fired oxide ceramics, article, January 1, 1990; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1052772/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.