Adhesion Between CVD Diamond Films and Tungsten

Conference · Sun May 05 00:00:00 EDT 1991

OSTI ID:5776118

Alam, M. ^[1]; Peebles, D. E. ^[2]; Tallant, D. R. ^[2]

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1. New Mexico Institute of Mining and Technology, Socorro, NM (United States)
2. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Adhesion between diamond films synthesized by a CVD method and tungsten has been investigated by a scratch and pull testing methods. Diamond films have been deposited at temperatures from 1173 to 1323 K with a growth rate ranging from 0.2 to 0.45 μm/hour. The films are highly crystalline and are dominated by (100) faces at low temperatures, changing to (111) at higher temperatures. Grain size and residual stress in the films increases with increasing deposition temperature. X-ray diffraction shows the expected diamond diffraction peaks plus peaks attributed to WC and W₂C. Raman spectroscopy shows a sharp diamond band for all of the films, with a small broad peak, attributed to amorphous carbon. There is no distinct correlation between diamond/amorphous carbon intensity with deposition temperature. Scratch adhesion testing shows the expected failure mode for brittle coatings, but can not be quantified because of severe degradation of the diamond stylus tip. Sebastion pull testing shows that the failure mode of the films correlates with deposition temperature, but specific adhesion strength values do not. Efforts are continuing to correlate adhesion strength with deposition and structural parameters of the diamond films.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5776118
• Report Number(s): SAND--90-2961C; CONF-910552--11; ON: DE91013757
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360601* -- Other Materials-- Preparation & Manufacture
ADHESION
AMORPHOUS STATE
CARBON
COATINGS
COHERENT SCATTERING
CRYSTAL GROWTH
DEPOSITION
DIAMONDS
DIFFRACTION
DIMENSIONS
ELEMENTAL MINERALS
ELEMENTS
FILMS
METALS
MINERALS
NONMETALS
RAMAN SPECTRA
RESIDUAL STRESSES
SCATTERING
SPECTRA
STRESSES
THICKNESS
TRANSITION ELEMENTS
TUNGSTEN
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION