Daniel T Schaefer

US Patent:

52541916, Oct 19, 1993

Filed:

Oct 4, 1990

Appl. No.:

7/591192

Inventors:

Kurt R. Mikeska - Wilmington DE
Daniel T. Schaefer - Newark DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C04B 3700

US Classification:

156 89

Abstract:

A method for reducing X-Y shrinkage during firing of ceramic bodies in which a flexible constraining layer, which becomes porous during firing, is applied to the ceramic body such that the flexible constraining layer conforms closely to the surface of the unfired ceramic body as the assemblage is fired.

US Patent:

50857207, Feb 4, 1992

Filed:

Apr 29, 1991

Appl. No.:

7/692651

Inventors:

Kurt R. Mikeska - Wilmington DE
Daniel T. Schaefer - Newark DE
Richard H. Jensen - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 1800

US Classification:

156 89

Abstract:

A method for reducing X-Y shrinkage during firing of green ceramic bodies in which a release layer, which becomes porous during firing, is placed upon the ceramic body and the assemblage is fired while maintaining pressure on the assemblage normal to the body surface.

US Patent:

53874749, Feb 7, 1995

Filed:

Aug 6, 1993

Appl. No.:

8/100530

Inventors:

Kurt R. Mikeska - Wilmington DE
Daniel T. Schaefer - Newark DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 700

US Classification:

428688

Abstract:

A composite comprising an unfired ceramic body comprising an admixture of finely divided particles of ceramic solids and sinterable inorganic binder dispersed in a volatilizable solid polymeric binder having affixed and closely conformed to a surface of said body a flexible constraining release layer comprising finely divided particles of non-metallic inorganic solids dispersed in a volatilizable solid polymeric binder, the sinterable inorganic binder of the ceramic body being such that Penetration of said binder into said constraining release layer during subsequent firing is no more than 50. mu. m and said constraining release layer being affixed and closely conforming such that upon firing X-Y shrinkage of the ceramic body is reduced. Also, a method for making the composite. The flexible, constraining, release layer substantially reduces and controls green ceramic body shrinkage in the x- and y-directions during firing.

US Patent:

54747414, Dec 12, 1995

Filed:

Dec 21, 1994

Appl. No.:

8/360556

Inventors:

Kurt R. Mikeska - Wilmington DE
Daniel T. Schaefer - Newark DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C04B 35622

US Classification:

419 10

Abstract:

A method for reducing X-Y shrinkage during firing of ceramic bodies in which a flexible constraining layer, which becomes porous during firing, is applied to the ceramic body such that the flexible constraining layer conforms closely to the surface of the unfired ceramic body as the assemblage is fired.