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Title: Low friction and galling resistant coatings and processes for coating

Abstract

A coated article of manufacture is described comprising: a substrate selected from the groups consisting of iron base alloys and nickel base alloys; a coating metallurgically bonded to the substrate and having a thickness between 7.5 and 100 microns; the coating formed by the process steps comprising: electro-spark depositing a first material from a cemented carbide electrode consisting essentially of chromium carbide in a matrix selected from the group consisting of nickel and binary nickel-chromium alloys. The matrix forms about 5 to 25 wt.% of the cemented carbide electrode. A layer of the first material is deposited on the substrate and is alloyed therewith; and electro-spark depositing a second material from an electrode selected from the group consisting of aluminium, aluminium alloys containing at least 95 wt.% aluminium, and nickel-molybdenum-chromium alloys containing greater than 20 wt.% molybdenum. A layer of the second material is deposited on the layer of the first material and is alloyed therewith; and the coating formed by the process characterized by a combination of excellent wear resistance and a low average dynamic friction coefficient when in rubbing contact with an identically coated component in a liquid, low oxygen, sodium environment at temperatures below about 650/sup 0/C.

Inventors:
Publication Date:
OSTI Identifier:
6672325
Patent Number(s):
US 4649086
Application Number:
TRN: 87-014605
Assignee:
Dept. of Energy, Washington, DC
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 21 Feb 1985
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; ELECTRODEPOSITED COATINGS; FRICTION; WEAR RESISTANCE; NICKEL BASE ALLOYS; PROTECTIVE COATINGS; ELECTRODEPOSITION; ALUMINIUM ALLOYS; BONDING; CEMENTING; CHROMIUM ALLOYS; CHROMIUM CARBIDES; ELECTRODES; HIGH TEMPERATURE; METALLURGY; MOLYBDENUM ALLOYS; SUBSTRATES; THICKNESS; ALLOYS; CARBIDES; CARBON COMPOUNDS; CHROMIUM COMPOUNDS; COATINGS; DEPOSITION; DIMENSIONS; ELECTROLYSIS; FABRICATION; IRON ALLOYS; JOINING; LYSIS; MECHANICAL PROPERTIES; NICKEL ALLOYS; SURFACE COATING; TRANSITION ELEMENT COMPOUNDS; 360101* - Metals & Alloys- Preparation & Fabrication; 360103 - Metals & Alloys- Mechanical Properties; 360601 - Other Materials- Preparation & Manufacture; 360603 - Materials- Properties

Citation Formats

Johnson, R N. Low friction and galling resistant coatings and processes for coating. United States: N. p., 1987. Web.
Johnson, R N. Low friction and galling resistant coatings and processes for coating. United States.
Johnson, R N. 1987. "Low friction and galling resistant coatings and processes for coating". United States.
@article{osti_6672325,
title = {Low friction and galling resistant coatings and processes for coating},
author = {Johnson, R N},
abstractNote = {A coated article of manufacture is described comprising: a substrate selected from the groups consisting of iron base alloys and nickel base alloys; a coating metallurgically bonded to the substrate and having a thickness between 7.5 and 100 microns; the coating formed by the process steps comprising: electro-spark depositing a first material from a cemented carbide electrode consisting essentially of chromium carbide in a matrix selected from the group consisting of nickel and binary nickel-chromium alloys. The matrix forms about 5 to 25 wt.% of the cemented carbide electrode. A layer of the first material is deposited on the substrate and is alloyed therewith; and electro-spark depositing a second material from an electrode selected from the group consisting of aluminium, aluminium alloys containing at least 95 wt.% aluminium, and nickel-molybdenum-chromium alloys containing greater than 20 wt.% molybdenum. A layer of the second material is deposited on the layer of the first material and is alloyed therewith; and the coating formed by the process characterized by a combination of excellent wear resistance and a low average dynamic friction coefficient when in rubbing contact with an identically coated component in a liquid, low oxygen, sodium environment at temperatures below about 650/sup 0/C.},
doi = {},
url = {https://www.osti.gov/biblio/6672325}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {3}
}