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Title: Low substrate temperature deposition of diamond coatings derived from glassy carbon

A process for depositing a diamond coating on a substrate at temperatures less than about 550.degree. C. A powder mixture of glassy carbon and diamond particles is passed through a high velocity oxy-flame apparatus whereupon the powders are heated prior to impingement at high velocity against the substrate. The powder mixture contains between 5 and 50 powder volume percent of the diamond particles, and preferably between 5 and 15 powder volume percent. The particles have a size from about 5 to about 100 micrometers, with the diamond particles being about 5 to about 30 micrometers. The flame of the apparatus provides a velocity of about 350 to about 1000 meters per second, with the result that upon impingement upon the substrate, the glassy carbon is phase transformed to diamond as coaxed by the diamond content of the powder mixture.
Inventors:
 [1];  [2]
  1. (Farragut, TN)
  2. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
870081
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Patent Number(s):
US 5453303
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
substrate; temperature; deposition; diamond; coatings; derived; glassy; carbon; process; depositing; coating; temperatures; 550; degree; powder; mixture; particles; passed; velocity; oxy-flame; apparatus; whereupon; powders; heated; prior; impingement; contains; 50; volume; percent; preferably; 15; size; 100; micrometers; 30; flame; provides; 350; 1000; meters; result; phase; transformed; coaxed; content; temperature deposition; diamond particles; diamond coating; apparatus provides; volume percent; glassy carbon; substrate temperature; powder mixture; mixture contains; rate temperature; /427/