@Article{MartinattiSanDurCruRan:2012:LuCoPr,
author = "Martinatti, Jos{\'e} Fernando and Santos, L{\'u}cia Vieira and
Durrant, S F and Cruz, N C and Rangel, E C",
affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Lubricating coating prepared by PIIID on a forming tool",
journal = "Journal of Physics: Conference Series",
year = "2012",
volume = "370",
pages = "012022",
keywords = "Lubricating coating, a-C:H films, hybrid plasma immersion ion
implantation and deposition.",
abstract = "In this work, the performance of a-C:H films produced by the
hybrid Plasma Immersion Ion Implantation and Deposition technique
as lubricating layers for a steel forming tool has been
investigated. Hardened steel (AISI M2, 64 HRC) plates coated with
a commercial TiN layer were used as substrates and the films were
deposited in a vacuum chamber fitted with two parallel-plate
electrodes. The discharges were generated in atmospheres composed
of 91% C2H2 and 9% Ar by the application of radiofrequency power
(13.56 MHz, 100 W) to the upper electrode while the lower one,
also used as the sample holder, was biased with high voltage
negative pulses (3.6 kV, 30 {\`{\i}}s, 300 Hz). A deposition
time of 840 s was used. The effects of the gas pressure, p, on
thickness, molecular structure, wettability, surface morphology
and topography, hardness and friction coefficient of the films
were investigated. Film thickness increased from 0.3 to 0.5
{\`{\i}}m when p was increased from 2.7 to 16.5 Pa. Generally,
the films were slightly hydrophilic, with contact angles of around
84°, and the deposition decreased the roughness of the steel. A
polymer-like structure was detected in high pressure depositions
and an amorphous carbon structure derived from the low pressure
procedures. Hardness decreased from 8.2 to 7.0 GPa with increasing
p. Improvement in tribological performance was indicated by the
fall in the friction coefficient from 0.5 to 0.2 as the deposition
pressure was reduced. Operating at the latter value (of micro)
would lead to a significant reduction in wear and hence to
significant economy in diverse industrial applications.",
doi = "10.1088/1742-6596/370/1/012022",
url = "http://dx.doi.org/10.1088/1742-6596/370/1/012022",
issn = "1742-6588",
label = "lattes: 4359261479122193 6 MartinattiMCRCSDDSR:2012:LuCoPr",
language = "pt",
targetfile = "1742-6596_370_1_012022.pdf",
urlaccessdate = "01 maio 2024"
}