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Title: Nitriding of super alloys for enhancing physical properties

Abstract

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.

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

Citation Formats

Purohit, A. Nitriding of super alloys for enhancing physical properties. United States: N. p., 1986. Web.
Purohit, A. Nitriding of super alloys for enhancing physical properties. United States.
Purohit, A. 1986. "Nitriding of super alloys for enhancing physical properties". United States.
@article{osti_5574033,
title = {Nitriding of super alloys for enhancing physical properties},
author = {Purohit, A},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5574033}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 13 00:00:00 EDT 1986},
month = {Tue May 13 00:00:00 EDT 1986}
}