Douglas E Drake

US Patent:

51242877, Jun 23, 1992

Filed:

Oct 31, 1990

Appl. No.:

7/608597

Inventors:

Thomas M. Wehrenberg - Jeffersonville IN
Charles N. McGarry - Clarksville IN
Sylvie Mahe - Fresnes, FR
Douglas A. Drake - Buckhannon WV

Assignee:

Corhart Refractories Corporation - Louisville KY

International Classification:

C04B 3548

US Classification:

501106

Abstract:

Dense zircon refractories having improved thermal shock damage resistance for use in glass melt or high alkali vapor contact applications comprise, and, consist essentially of, about fifty percent by weight or more ZrSiO. sub. 4, at least about one percent zirconia in particle form distributed substantially uniformly throughout the composition of the refractory, and optionally, a zircon grain growth enhancing composition, preferably TiO. sub. 2.

US Patent:

49923960, Feb 12, 1991

Filed:

Aug 15, 1989

Appl. No.:

7/395285

Inventors:

Charles N. McGarry - Clarksville IN
Thomas M. Wehrenberg - Jeffersonville IN
Douglas A. Drake - Louisville KY
Gary L. Lawson - Louisville KY

Assignee:

Corhart Refractories Corporation - Louisville KY

International Classification:

C04B 3548
C04B 3562

US Classification:

501107

Abstract:

Fused AZS grain refractory compositions suitable for making ceramically or chemically bonded refractory articles, and the articles so made, are disclosed. The refractory compositions consist essentially of (a) 40-85 wt. % fused AZS grain, and (b) 15-50 wt. % of at least one constituent selected from the group consisting of (i) 10-20 wt. % reactive alumina and (ii) 0-45 wt. % chromic oxide.

US Patent:

51067951, Apr 21, 1992

Filed:

May 26, 1989

Appl. No.:

7/358776

Inventors:

Douglas A. Drake - Louisville KY
Charles N. McGarry - Clarksville IN
Thomas M. Wehrenberg - Jeffersonville IN

Assignee:

Corhart Refractories Corporation - Louisville KY

International Classification:

C04B 3512

US Classification:

501126

Abstract:

Refractory compositions comprising at least eighty percent or more by weight Cr. sub. 2 O. sub. 3 densified by the addition of at least one-half percent and preferably about four percent TiO. sub. 2 have about one-quarter percent to about fifteen percent by weight relatively finely divided monoclinic zirconia particles substantially uniformly dispersed therethrough to induce microcracks in the densified chromic oxide and improve thermal shock damage resistance of the refractory. Zirconia additions of up to at least five percent by weight exhibit the high glass corrosion resistance of similar densified chromic oxide compositions without zirconia.