Improvement of adhesion of diamond coatings to WC(Co) tool substrates

Conference · Tue Aug 01 04:00:00 EDT 1995

OSTI ID:82564

Fan, W D; Jagannadham, K; Narayan, J ^[1]

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1. North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering

Adhesion of diamond coatings to cutting tool substrates is an important property that is needed to replace the polycrystalline diamond tools (PCD) in machine tool applications. The improvement in adhesion of diamond on WC(Co) tool substrates is brought about by formation of a composite layer. Composite layers made up of TiC or TiN and diamond were formed by laser physical vapor deposition of ceramic coatings and hot filament chemical vapor deposition of diamond films. A first layer of discontinuous diamond film on WC is embedded in the ceramic coatings followed by growth of a continuous diamond film that maintains continuity with the first diamond layer. The composite coatings were characterized by SEM and Raman spectroscopy. Adhesion and wear resistance of the diamond coatings were measured using a polishing water test. The mechanisms of improvement in adhesion were analyzed by finite element modeling. Results show that TiC composite layers improve the adhesion of diamond coatings significantly. This improvement is considered to arise from the modification of the thermal stress at the interface between the diamond film and the WC(Co) tool substrate.

• OSTI ID: 82564
• Report Number(s): CONF-941144--; ISBN 1-55899-264-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
CHEMICAL VAPOR DEPOSITION
COBALT
COMPOSITE MATERIALS
DIAMONDS
FINITE ELEMENT METHOD
INTERFACES
MATHEMATICAL MODELS
MICROSTRUCTURE
PHYSICAL VAPOR DEPOSITION
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
THERMAL STRESSES
TITANIUM CARBIDES
TITANIUM NITRIDES
TUNGSTEN CARBIDES
WEAR