title: Influence of WC-Co substrate pretreatment on diamond film deposition by laser-assisted combustion synthesis.
abstract: The quality of diamond films deposited on cemented tungsten carbide substrates (WC-Co) is limited by the presence of the cobalt binder. The cobalt in the WC-Co substrates enhances the formation of nondiamond carbon on the substrate surface, resulting in a poor film adhesion and a low diamond quality. In this study, we investigated pretreatments of WC-Co substrates in three different approaches, namely, chemical etching, laser etching, and laser etching followed by acid treatment. The laser produces a periodic surface pattern, thus increasing the roughness and releasing the stress at the interfaces between the substrate and the grown diamond film. Effects of these pretreatments have been analyzed in terms of microstructure and cobalt content. Raman spectroscopy was conducted to characterize both the diamond quality and compressive residual stress in the films.
authors.affiliation: Department of Electrical Engineering, University of Nebraska, Lincoln, Nebraska 68588-0511, USA.
authors.forename: Amélie
authors.initials: A
authors.lastname: Veillère
authors.forename: Thomas
authors.initials: T
authors.lastname: Guillemet
authors.forename: Zhi Qiang
authors.initials: ZQ
authors.lastname: Xie
authors.forename: Craig A
authors.initials: CA
authors.lastname: Zuhlke
authors.forename: Dennis R
authors.initials: DR
authors.lastname: Alexander
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Silvain
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Heintz
authors.forename: Namas
authors.initials: N
authors.lastname: Chandra
authors.forename: Yong Feng
authors.initials: YF
authors.lastname: Lu