@Article{FragaCoRoViCaCoTr:2016:StPrAd,
author = "Fraga, Mariana Amorim and Contin, Andr{\'e} and
Rodr{\'{\i}}guez, L. A. A. and Vieira, J. and Campos, R. A. and
Corat, Evaldo Jos{\'e} and Trava Airoldi, Vladimir Jesus",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de S{\~a}o Paulo (UNIFESP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal de S{\~a}o Paulo
(UNIFESP)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}
and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Nano- And microcrystalline diamond deposition on pretreated WC-Co
substrates: Structural properties and adhesion",
journal = "Materials Research Express",
year = "2016",
volume = "3",
number = "2",
pages = "025601",
month = "Feb.",
keywords = "Adhesion, Brazilian MRS, Diamond, Seeding, Wc-co substrate.",
abstract = "Many developments have been made to improve the quality and
adherence of CVD diamond films onto WC-Co hard metal tools by the
removing the cobalt from the substrate surface through substrate
pretreatments. Here we compare the efficiency of three chemical
pretreatments of WC-Co substrates for this purpose. First, the
work was focused on a detailed study of the composition and
structure of as-polished and pretreated substrate surfaces to
characterize the effects of the substrate preparation. Considering
this objective, a set ofWC-9%Co substrates, before and after
pretreatment, was analyzed by FEG-SEM, EDS and x-ray diffraction
(XRD). The second stage of the work was devoted to the evaluation
of the influence of seeding process, using 4 nm diamond
nanoparticles, on the morphology and roughness of the pretreated
substrates. The last and most important stage was to deposit
diamond coatings with different crystallite sizes (nano and micro)
by hot-filament CVD to understand fully the mechanism of growth
and adhesion of CVD diamond films on pretreated WC-Co substrates.
The transition from nano to microcrystalline diamond was achieved
by controlling theCH4,/H2, gas ratio. The nano and
microcrystalline samples were grown under same time at different
substrate temperatures 600 °C and 800 °C, respectively. The
different substrate temperatures allowed the analysis of the
cobalt diffusion from the bulk to the substrate surface during CVD
film growth. Furthermore, it was possible to evaluate how the
coating adhesion is affected by the diffusion. The diamond
coatings were characterized by Raman spectroscopy, XRD, EDS,
FEG-SEM, atomic force microscope and 1500 NRockwell indentation to
evaluate the adhesion.",
doi = "10.1088/2053-1591/3/2/025601",
url = "http://dx.doi.org/10.1088/2053-1591/3/2/025601",
issn = "2053-1591",
language = "en",
targetfile = "Fraga_nano.pdf",
urlaccessdate = "15 jun. 2024"
}