The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 1994
Filed:
Feb. 19, 1993
Applicant:
Inventor:
Paul M Benson, Pittsburgh, PA (US);
Assignee:
Vesuvius Crucible Company, Wilmington, DE (US);
Primary Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
266236 ; 266280 ; 222590 ; 222606 ; 222607 ; 501100 ;
Abstract
A fired carbon-bonded, oxide refractory body for use in casting aluminum-killed steel has a metal contacting surface which is resistant to both steel erosion and buildup of alumina. The layer is formed by first firing the pressed body in an oxidizing atmosphere to form a porous oxidized zone on selected steel contacting surfaces. The remaining surface portions of the body are protected against oxidation during firing by a glaze applied prior to firing. A carbon free refractory slip or slurry is infiltrated into the porous oxidized zone to create the erosion and buildup resistant surface layer. A preferred infiltrant material is alumina.