Patent Number: 6,251,335

Title: Method for fabricating textured ceramics

Abstract: The process incorporating the invention enables fabrication of dense, highly textured (fraction of oriented grains >20 vol. %) alumina. The method uses a mixture of aluminum metal powder, alumina powder, tabular alumina grains and a liquid phase former. A dry powder mixtures of these components is compacted by dry forming techniques such as roll compaction, uniaxial pressing, forging and/or double action pressing. The formed part is then heated at 0.5-10.degree. C./min. to a temperature between 450 and 500.degree. C. and is held for 2-15 h, and is then heated at 1-10.degree. C/min. to 900-1070.degree. C. and is held for 2-10 hours to convert the aluminum particles into alumina. The part is then heated to a higher temperature (>1400.degree. C.) to form a liquid phase which assists densification and promotes the growth of the tabular alumina grains. The aspect ratio range of the textured alumina grains is from 2-14.

Inventors: Messing; Gary L. (State College, PA), Suvaci; Ender (State College, PA)

Assignee: The Penn State Research Foundation

International Classification: C04B 35/111 (20060101); C04B 35/65 (20060101); C04B 033/32 ()

Expiration Date: 06/26/2018