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. 24, 1984
Filed:
Mar. 15, 1983
Applicant:
Inventor:
John A Ross, Basking Ridge, NJ (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; C23C / ;
U.S. Cl.
CPC ...
148 166 ; 148 16 ; 148 165 ; 148 203 ;
Abstract
The surface of a ferrous metal workpiece is heat treated by immersing the workpiece to be treated in the fluidized particulate bed of a fluidized bed furnace. The bed is fluidized by a gas atmosphere comprising ammonia gas, hydrocarbon gas, and optionally a non-reactive gas. The temperature of the fluidized bed is maintained at about 600.degree. F. to 1250.degree. F. The proportion of the ammonia gas in the gaseous atmosphere may be varied to alter the surface characteristics of the treated workpiece. The compound layer and the underlying diffusion zone exhibit increased thicknesses. Increased hardness and increased impact loading resistance of the treated surface are obtainable.