PAUL DARRELL OWNBY
Pilots at Burgher Dr, Rolla, MO

4400232, Aug 23, 1983

Nov 9, 1981

6/319638

Paul D. Ownby - Rolla MO
Paul E. Grayson - Joplin MO

Eagle-Picher Industries, Inc. - Cincinnati OH

C30B 3300

156601

In the production of silicon articles at an elevated temperature, a stream comprising a controlled mixture of an oxygen-containing first gas and a second gas is admitted to the processing chamber. The first gas is one which partially dissociates under the conditions in the chamber to form both oxygen and the second gas. The second gas is one which is not harmful to silicon at the conditions in the chamber. Substantially equilibrium conditions are established in the chamber so that the dissociation of the first gas to oxygen occurs reversibly. The partial pressure of oxygen (P. sub. O. sbsb. 2) is sensed in the chamber during processing of the article. In response to the P. sub. O. sbsb. 2 level, the ratio of the rates of flow of the oxygen-containing gas and the second gas is adjusted so as to maintain the P. sub. O. sbsb. 2 at a level less than about 10. sup.

4054627, Oct 18, 1977

May 14, 1973

5/359661

Paul Darrell Ownby - Rolla MO

F27B 904, C04B 3512

264 65

A sintered, fine grained, polycrystalline, essentially fully dense, essentially single phase Cr. sub. 2 O. sub. 3 body is prepared by sintering Chromium Sesquioxide (Cr. sub. 2 O. sub. 3) at essentially the equilibrium oxygen partial pressure (P. sub. O. sbsb. 2) for the formation of Cr. sub. 2 O. sub. 3 from its elements at the sintering temperature. To achieve optimum theoretical density a second metal oxide dopant such as MgO, capable of controlling the grain size, is added. In addition, Cr. sub. 2 O. sub. 3 bodies are rendered more stable, and thus have a longer life, by maintaining over the body an atmosphere which is essentially equilibrium P. sub. O. sbsb. 2 for the formation of Cr. sub. 2 O. sub. 3 from its elements at that temperature.