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Plasma spraying method for forming diamond and diamond-like coatings

Patent ·
OSTI ID:870980
 [1];  [2];  [3]
  1. Farragut, TN
  2. Oak Ridge, TN
  3. Knoxville, TN
+ Show Author Affiliations

A method and composition for the deposition of a thick layer (10) of diamond or diamond-like material. The method includes high temperature processing wherein a selected composition (12) including at least glassy carbon is heated in a direct current plasma arc device to a selected temperature above the softening point, in an inert atmosphere, and is propelled to quickly quenched on a selected substrate (20). The softened or molten composition (18) crystallizes on the substrate (20) to form a thick deposition layer (10) comprising at least a diamond or diamond-like material. The selected composition (12) includes at least glassy carbon as a primary constituent (14) and may include at least one secondary constituent (16). Preferably, the secondary constituents (16) are selected from the group consisting of at least diamond powder, boron carbide (B.sub.4 C) powder and mixtures thereof.

Research Organization:
LOCKHEED MARTIN ENRGY SYST INC
DOE Contract Number:
AC05-84OR21400
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
Patent Number(s):
US 5635254
OSTI ID:
870980
Country of Publication:
United States
Language:
English

References (4)

The physical and chemical character of graphite journal March 1963
Newer Forms of Carbon and their Uses journal January 1969
Vitreous carbon — A new form of carbon journal November 1967
Single-Crystal Diffraction Patterns from Vitreous Carbon journal October 1974

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Related Subjects

/427/
10
12
14
16
18
20
atmosphere
boron
boron carbide
carbide
carbon
coatings
composition
comprising
consisting
constituent
constituents
crystallizes
current
current plasma
deposition
device
diamond
diamond powder
diamond-like
diamond-like material
direct
direct current
form
forming
glassy
glassy carbon
heated
including
inert
inert atmosphere
layer
material
method
mixtures
molten
plasma
plasma spray
plasma spraying
powder
preferably
primary
processing
propelled
quenched
quickly
secondary
selected
selected composition
selected substrate
selected temperature
softened
softening
spraying
spraying method
substrate
temperature
temperature process
thick
thick layer