The synthesis, characterization, and mechanical properties of thick, ultrahard cubic boron nitride films deposited by ion-assisted sputtering

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365961· OSTI ID:565375

Mirkarimi, P B; Medlin, D L; McCarty, K F; Dibble, D C; Clift, W M ^[1]; Knapp, J A; Barbour, J C ^[2]

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1. Sandia National Laboratories, Livermore, California 94550 (United States)
2. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Significant ion irradiation is needed during growth to synthesize cubic boron nitride (cBN) films. This results in large film stresses, which have limited cBN film thicknesses to only a few hundred nm and represents a significant barrier in the development of cBN film technology. Using a new hybrid deposition technique, we have synthesized cubic BN films up to 700 nm (0.7 {mu}m) thick. A compositional and structural analysis of the films using several standard characterization techniques confirms that relatively thick polycrystalline films with a high cBN content were synthesized. Thicker cBN films enable hardness measurements to be undertaken without major substrate effects. Nanoindentation measurements yield hardness values for the cubic BN films up to 60{endash}70 GPa, which are greater than values measured for bulk cBN. The measured elastic modulus was observed to be lower than the bulk, and this can be accounted for by an elastic deformation of the silicon substrate. The mechanical properties of the cubic BN films are discussed with reference to other ultrahard thin films such as diamond and diamondlike carbon. {copyright} {ital 1997 American Institute of Physics.}

• Research Organization: Sandia National Laboratory
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 565375
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 82; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON COMPOUNDS
BORON NITRIDES
CUBIC LATTICES
ELASTICITY
ENERGY BEAM DEPOSITION
HARDNESS
IONS
MECHANICAL PROPERTIES
SPUTTERING
STRESSES
SYNTHESIS
THIN FILMS