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:
Apr. 17, 2007
Filed:
Feb. 25, 2005
Philip A. Jennings, Bristol, GB;
Neil J. D'souza, Derby, GB;
Philip A. Jennings, Bristol, GB;
Neil J. D'Souza, Derby, GB;
Rolls-Royce PLC, London, GB;
Abstract
In order to more effectively utilise seed crystalsto achieve a single crystal grain orientation for a component without the problems of utilising a helix constriction previously necessary to avoid epitaxial grain competition and growth. The present invention creates a wax component pattern. This patterncomprises integral sections of wax for a mould component section and for a spacer section with the seed crystalor holder for that crystal therebetween. This patternis then utilised in order to form a final refractory mould within which the component is formed. By appropriate choice of the spacer section, an appropriate spacing between an upper surface of the seedwhich will be the initial interface with molten castable material to form the component and a chiller surface through which heat is transferred can be determined in order to achieve successful transfer of the seedorientation to the formed component.