Microwave sintering of nanocrystalline ceramics
- United States Naval Academy, Annapolis, MD (United States)
- Naval Research Lab., Washington, DC (United States); and others
A single-mode cavity microwave furnace, operating in the TE{sub 103} mode at 2.45 GHz, has been set up at the Naval Research Laboratory (NRL) and is currently being used to investigate sintering of nanocrystalline ceramics. This presentation will discuss the apparatus used and the results obtained to date. The high purity Al{sub 2}O{sub 3} and TiO{sub 2} nanocrystalline powders were prepared by the sol-gel method. These powders were first uniaxially pressed to 14 MPa, CIP`ed to various pressures > 420 MPa and finally sectioned into wafers. The density of the green wafers was 30 to 38% TD. The wafers were heated in the microwave furnace for up to three hours at temperatures {<=} 1720{degrees}C. The temperature of the workpiece was monitored using an optical pyrometer. Final densities up to 80% TD have been obtained to date for Al{sub 2}O{sub 3} and up to 52% TD for TiO{sub 2}. Work is ongoing to characterize the sintered compacts, optimize the casketing for this furnace, and lay the groundwork for new studies using a 35 GHz gyrotron and quasioptical gyrotron tunable from 85 to 120 GHz.
- OSTI ID:
- 269942
- Report Number(s):
- CONF-9505249-; TRN: 96:002970-0045
- Resource Relation:
- Conference: 97. American Ceramic Society (ACS) annual meeting and exposition, Cincinnati, OH (United States), 1-4 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of Ceramic transactions: Microwaves - theory and application in materials processing III. Volume 49; PB: 666 p.
- Country of Publication:
- United States
- Language:
- English
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