Ronald L Stephenson

US Patent:

55344682, Jul 9, 1996

Filed:

Sep 30, 1994

Appl. No.:

8/315376

Inventors:

Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C04B 3550
C04B 35624

US Classification:

501 12

Abstract:

A La. sub. 1-x Sr. sub. x Cr. sub. 1-y Mn. sub. y O. sub. 3 ceramic oxide gel obtainable by the process comprising the steps of: (a) providing a colloidal solution of polyhydroxy organic chelating agents selected from the group consisting of ethylene glycol and citric acid and metal salts selected from the group consisting of lanthanum, strontium, chromium, and manganese, each salt being present in an amount necessary to provide the stoichiometric amount of metal ions required in the ceramic oxide gel; (b) heating the colloidal solution to hydrolyze and polymerize the metal ions in the solution to a mixed metal oxide precursor of the ceramic oxide gel; and (c) adding organic acid, water or both to the precursor of the ceramic oxide gel to peptize the metal ions; and (d) heating the peptized precursor to evaporate solvent to form a thick, viscous, flexible, ductile, handleable gel that can be cast, extruded, or drawn; wherein x and y are independently 0 or 1.

US Patent:

54076188, Apr 18, 1995

Filed:

Aug 13, 1990

Appl. No.:

7/566557

Inventors:

Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C04B 3564

US Classification:

264 63

Abstract:

A process is provided for preparing ceramics which can be produced into any predetermined shape by way of gel precursors.