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:
Jan. 28, 1992
Filed:
Feb. 26, 1990
Kazuhiro Mori, Toyota, JP;
Soya Takagi, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A buildup valve comprising a valve body of a quench-hardenable, heat resistant steel having a valve face and a buildup layer formed on the valve face from a cobalt or nickel base superalloy having higher wear and heat resistances than the heat resistant steel is useful in internal combustion engines. A hardened layer is formed in the valve face portion adjacent the buildup layer and has a maximum thickness between 0.05 mm and 2.0 mm. The buildup layer thus has a reduced thickness between 0.1 mm and 0.5 mm. The buildup valve is produced by supplying and depositing a powder of the alloy on the valve face, and applying a scanning high flux energy laser or plasma beam to the powder deposit to cause the powder to quickly melt and then quickly solidify thereby forming the buildup layer and at the same time, to cause a surface layer of the valve body underlying the powder deposit to quickly heat and then quickly cool thereby forming the hardened layer.