Rapid consolidation of nanophase Al{sub 2}O{sub 3} and an Al{sub 2}O{sub 3}/Al{sub 2}TiO{sub 5} composite
- Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
A rapid consolidation technique has been utilized in producing single phase Al{sub 2}O{sub 3} in less than 10 minutes at 1,400 C resulting in a grain size less than 500 nm. TiO{sub 2} has been added in hopes of obtaining Al{sub 2}O{sub 3}/Al{sub 2}TiO{sub 5} nanocomposites in sintering times less than 30 minutes. The sintering process involves resistance heating of a graphite die containing the powder at heating rates of about 10 C/s. The resistance heating step is preceded by a preparatory step consisting of DC voltage pulses applied across a prepressed powder compact. The retention of the nanostructure is attributed to the rapid heating rate although the possible effect of the DC pulses are also discussed. An Al{sub 2}O{sub 3}/Al{sub 2}TiO{sub 5} composite has been produced during a short anneal immediately following sintering of an Al{sub 2}O{sub 3}/TiO{sub 2} nanocomposite. Substantial grain growth has been observed to occur during the transformation taking the composite to the microcrystalline regime.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 522326
- Report Number(s):
- CONF-961202-; ISBN 1-55899-361-4; TRN: IM9739%%47
- Resource Relation:
- Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of Nanophase and nanocomposite materials 2; Komarneni, S. [ed.] [Pennsylvania State Univ., University Park, PA (United States)]; Parker, J.C. [ed.] [Nanophase Technologies Corp., Burr Ridge, IL (United States)]; Wollenberger, H.J. [ed.] [Hahn-Meitner Inst., Berlin (Germany)]; PB: 573 p.; Materials Research Society symposium proceedings, Volume 457
- Country of Publication:
- United States
- Language:
- English
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