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Title: Method for heat treating and sintering metal oxides with microwave radiation

Abstract

A method for microwave sintering materials, primarily metal oxides, is described. Metal oxides do not normally absorb microwave radiation at temperatures ranging from about room temperature to several hundred degrees centrigrade are sintered with microwave radiation without the use of the heretofore required sintering aids. This sintering is achieved by enclosing a compact of the oxide material in a housing or capsule formed of a oxide which has microwave coupling properties at room temprature up to at least the microwave coupling temperature of the oxide material forming the compact. The heating of the housing effects the initial heating of the oxide material forming the compact by heat transference and then functions as a thermal insulator for the encased oxide material after the oxide material reaches a sufficient temperature to adequately absorb or couple with microwave radiation for heating thereof to sintering temperature.

Inventors:
 [1];  [2];  [3]
  1. Farragut, TN
  2. Oak Ridge, TN
  3. Knoxville, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
867175
Patent Number(s):
4880578
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
DOE Contract Number:  
AC05-840R21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; heat; treating; sintering; metal; oxides; microwave; radiation; materials; primarily; described; normally; absorb; temperatures; ranging; temperature; hundred; degrees; centrigrade; sintered; heretofore; required; aids; achieved; enclosing; compact; oxide; material; housing; capsule; formed; coupling; properties; temprature; forming; heating; effects; initial; transference; functions; thermal; insulator; encased; reaches; sufficient; adequately; couple; microwave sintering; microwave radiation; metal oxide; heat transfer; metal oxides; oxide material; heat treating; temperatures ranging; thermal insulator; material forming; sintering aids; sintering temperature; microwave coupling; wave coupling; sufficient temperature; sintering materials; initial heating; heretofore required; hundred degrees; degrees centrigrade; /264/

Citation Formats

Holcombe, Cressie E, Dykes, Norman L, and Meek, Thomas T. Method for heat treating and sintering metal oxides with microwave radiation. United States: N. p., 1989. Web.
Holcombe, Cressie E, Dykes, Norman L, & Meek, Thomas T. Method for heat treating and sintering metal oxides with microwave radiation. United States.
Holcombe, Cressie E, Dykes, Norman L, and Meek, Thomas T. Sun . "Method for heat treating and sintering metal oxides with microwave radiation". United States. https://www.osti.gov/servlets/purl/867175.
@article{osti_867175,
title = {Method for heat treating and sintering metal oxides with microwave radiation},
author = {Holcombe, Cressie E and Dykes, Norman L and Meek, Thomas T},
abstractNote = {A method for microwave sintering materials, primarily metal oxides, is described. Metal oxides do not normally absorb microwave radiation at temperatures ranging from about room temperature to several hundred degrees centrigrade are sintered with microwave radiation without the use of the heretofore required sintering aids. This sintering is achieved by enclosing a compact of the oxide material in a housing or capsule formed of a oxide which has microwave coupling properties at room temprature up to at least the microwave coupling temperature of the oxide material forming the compact. The heating of the housing effects the initial heating of the oxide material forming the compact by heat transference and then functions as a thermal insulator for the encased oxide material after the oxide material reaches a sufficient temperature to adequately absorb or couple with microwave radiation for heating thereof to sintering temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}