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Title: Plasma spraying method for forming diamond and diamond-like coatings

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.
 [1];  [2];  [3]
  1. (Farragut, TN)
  2. (Oak Ridge, TN)
  3. (Knoxville, TN)
Issue Date:
OSTI Identifier:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5635254
Contract Number:
Research Org:
Country of Publication:
United States
plasma; spraying; method; forming; diamond; diamond-like; coatings; composition; deposition; thick; layer; 10; material; temperature; processing; selected; 12; including; glassy; carbon; heated; direct; current; device; softening; inert; atmosphere; propelled; quickly; quenched; substrate; 20; softened; molten; 18; crystallizes; form; comprising; primary; constituent; 14; secondary; 16; preferably; constituents; consisting; powder; boron; carbide; mixtures; thick layer; plasma spray; boron carbide; direct current; inert atmosphere; plasma spraying; glassy carbon; selected temperature; temperature process; selected substrate; diamond-like material; selected composition; diamond powder; spraying method; current plasma; /427/