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. 18, 1979
Filed:
Apr. 05, 1978
Peter Jeschke, Walluf, DE;
Gunter Gelsdorf, Wiesbaden-Nordenstadt, DE;
Didier-Werke A.G., Wiesbaden, DE;
Abstract
A refractory plate for use in slide closures for metallurgical vessels includes a basic plate element adapted to face a liquid metal melt. The basic plate element is formed of a moldable refractory concrete material including 70 to 95% by weight of alumina and 5 to 30% by weight of a cement containing approximately 80% by weight alumina. Alternatively, the 70 to 95% by weight of alumina may be replaced by an alumina-containing raw material containing more than 70% by weight of alumina, for example at least one raw material selected from the group consisting of sintered bauxite, synthetic mullite, corundum, and grinding disk fragments. The basic plate element has embedded therein a ceramic oxide insert having a cold bending strength higher than 300 kp/cm.sup.2, a hot bending strength at 1500.degree. C. higher than 40 kp/cm.sup.2, a cold compressive strength higher than 2000 kp/cm.sup.2, and a permeability to gas lower than 1.0 nanoperm. The basic plate element and the insert have extending therethrough a throughflow opening. The width of the insert, in a direction transverse to the direction of movement of the refractory plate, is from 1.3 to 3.5 times the diameter of the throughflow opening.