Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1991-04-15
1993-06-29
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 56, 264 60, 264 26, C04B 3564
Patent
active
052231860
ABSTRACT:
A method of sintering nanocrystalline material is disclosed wherein the nanocrystalline material is microwaved to heat the material to a temperature less than about 70% of the melting point of the nanocrystalline material expressed in degrees K. This method produces sintered nanocrystalline material having a density greater than about 95% of theoretical and an average grain size not more than about 3 times the average grain size of the nanocrystalline material before sintering. Rutile TiO.sub.2 as well as various other ceramics have been prepared. Grain growth of as little as 1.67 times has resulted with densities of about 90% of theoretical.
REFERENCES:
patent: 4163140 (1979-07-01), Bardet
Sutton, Microwave Processing of Ceramic Materials, Ceramic Bulletin, vol. 68, No. 2, 1989.
Hahn et al., "Sintering Characteristics of Nanocrystalline TiO.sub.2 ", J. Mater. Res., vol. 5, No. 3, Mar. 1990.
Blake and Meek, "Microwave Processed Composite Materials".
Wilson and Kunz, "Microwave Sintering of Partially Stabilized Zirconia".
Kemer and Johnson, "Microwave Plasma Sintering of Alumina".
Eastman et al., "Microwave Sintering of Nanocrystalline TiO.sub.2 ".
Eastman Jeffrey A.
Katz Joel D.
Sickafus Kurt E.
Anderson Thomas G.
Derrington James
Fisher Robert J.
Moser William R.
The United States of America as represented by the United States
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