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:
Jul. 16, 1985
Filed:
Sep. 23, 1983
Karel Zverina, Prague, CS;
Petr Kroupa, Prague, CS;
Ceskoslovenska akademie ved, Prague, CS;
Abstract
The present invention relates to a method of producing self-supporting constructional elements by plasma-spraying onto a removable core. Recently, there is in widespread use the method of producing constructional elements, especially of heat-resistant elements of rotary shape, by plasma-spraying of ceramic oxides onto a removable core. Existing problems in the art are caused by the slow removal of an intermediate layer, which separates the deposited constructional element material from the core, in suitable solvents, and the necessary neutralization of the produced constructional element. These disadvantages are overcome by the method of the present invention characterized in that a core is preheated to a temperature in the range of from about 200.degree. C. to about 650.degree. C., a metallic or non-metallic intermediate layer having a thickness of about 0.1 to about 2 millimeters is deposited on the core by plasma-spraying. Afterwards, there are deposited by plasma-spraying the required layers on the intermediate layer; the required layers being of a heat-resistant ceramic oxide and forming the self-supporting constructional element. Thereafter, the core is cooled, the intermediate layer is separated from the material of the self-supporting constructional element, and the constructional element is removed from the core. The method according to the present invention takes advantage of the thermal expansion of different materials and considerably speeds-up the production. It has special utility for the production of hollow bodies having a cylindrical or nearly cylindrical shape.