Nitriding of super alloys for enhancing physical properties

Patent · Tue May 13 00:00:00 EDT 1986

OSTI ID:5574033

Purohit, A

1. A process is described of improving the high temperature physical properties of a super alloy having a thickness, containing at least about 67% of Cr and Ni, and having a melting temperature in the range of 1300/sup 0/-1350/sup 0/C; comprising the step of exposing the alloy to an atmosphere of elemental nitrogen (N vs N/sub 2/) at elevated temperatures in excess of 750/sup 0/C but less than 1150/sup 0/C for a time sufficient to nitride at least some of the surface of the alloy and establish barrier nitrides for shielding the available oxidizing metallic species of the alloy, the barrier nitrides extending to a depth in the order of 25-100 micrometers but substantially less than the thickness of the alloy.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4588450
• OSTI ID: 5574033
• Resource Relation: Patent File Date: Filed date 25 Jun 1984
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
NITRIDATION
PHYSICAL PROPERTIES
HEAT RESISTING ALLOYS
NICKEL ALLOYS
MELTING POINTS
NITRIDES
NITROGEN
OXIDATION
THICKNESS
TIME DEPENDENCE
VERY HIGH TEMPERATURE
ALLOYS
CHEMICAL REACTIONS
DIMENSIONS
ELEMENTS
HEAT RESISTANT MATERIALS
MATERIALS
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360104* - Metals & Alloys- Physical Properties
360101 - Metals & Alloys- Preparation & Fabrication