Hydrogenated amorphous carbon or diamondlike carbon (DLC) films were formed by 400 eV methane (CH4) ion bombardment of various smooth and rough ceramics, as well as ceramics coated with a layer of Si or Ti. Adhesion was measured by a bonded‐pin method. Excellent adhesion was measured for smooth SiC and Si3N4, but adhesion of DLC to smooth Al2O3 and ZrO2 was negligible. The use of a Si bonding interlayer produced good adhesion to all the substrates, but a Ti layer was ineffective due to poor bonding between the DLC film and Ti. Bulk thermodynamic calculations are not directly applicable to bonding at the interface because the interface is two dimensional and the compositions of interfacial phases are generally not known. If the standard enthalpy ΔH° for the reaction between CH4 and the substrate material is calculated under the assumption that a carbide phase is produced, a relationship is seen between the reaction enthalpy and the relative adhesion. Large positive enthalpies are associated with poor adhesion; negative or small positive enthalpies are associated with good adhesion. This relation between enthalpy and adhesion was also observed for DLC deposited on Si. The lack of adhesion to the Ti was attributed to inadvertent formation of a surface oxide layer that rendered the enthalpy for the reaction with CH4positive.
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July 1994
The 40th National Symposium of the American Vacuum Society
15−19 Nov 1993
Orlando, Florida (USA)
Research Article|
July 01 1994
Pull‐test adhesion measurements of diamondlike carbon films on silicon carbide, silicon nitride, aluminum oxide, and zirconium oxide
R. A. Erck;
R. A. Erck
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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F. A. Nichols;
F. A. Nichols
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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J. F. Dierks
J. F. Dierks
North Dakota State University, Fargo, North Dakota 58105
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J. Vac. Sci. Technol. A 12, 1583–1586 (1994)
Article history
Received:
November 18 1993
Accepted:
February 14 1994
Citation
R. A. Erck, F. A. Nichols, J. F. Dierks; Pull‐test adhesion measurements of diamondlike carbon films on silicon carbide, silicon nitride, aluminum oxide, and zirconium oxide. J. Vac. Sci. Technol. A 1 July 1994; 12 (4): 1583–1586. https://doi.org/10.1116/1.579359
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