Process for controlling carbon content of injection molding steels during debinding

US5334341A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Eric Streicher · Viroflay, FR
• Randall M. German · Latham, US

Key dates

• Filing date: May 27, 1992
• Grant date: Aug 2, 1994
• Expiry date: May 27, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2998/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for controlling the carbon content in a metallic piece molded by injection or other process comprising, PA1 a) heating the shaped piece under a 100% hydrogen atmosphere up to about 200.degree. C., PA1 b) replacing the 100% H.sub.2 atmosphere by a substantially 100% nitrogen atmosphere and heating the pieces from 200.degree. C. to 450.degree. C., PA1 c) maintaining the temperature in the enclosure at substantially 450.degree. C. while subjecting the pieces to an atmosphere comprising from 15% to 100% vol. hydrogen, the complement being nitrogen, then PA1 d) replacing the atmosphere by a substantially 100% nitrogen and PA1 e) heating the pieces from 450.degree. C. to substantially 700.degree. C. in order to further eliminate the remaining binder.