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• W755629294 abstract "In this study, the protective effect produced by the application of a Hydrogenated Amorphous Carbon (a-C:H) film on the surface of a forming tool containing a titanium nitride (TiN) layer was investigated. The required force to forming the material is relatively high, around a few tons. The a-C:H films were applied to reduce the friction coefficient between the surface of the forming tool and the raw material, also generating the possibility of the reduction or elimination of the lubrication applied to the tape surface in the form of zinc phosphate and drawing oil. The samples were produced from AISI M2 steel, using soft machining processes, heat treatment, grinding and polishing with subsequent application of the TiN layer by PVD (Physical Vapor Deposition). To permit comparison, AISI M2 steel without the TiN layer was also used as a substrate. The samples were initially cleaned in ultrasonic baths and subsequently by plasma ablation. Low temperature plasmas of hydrocarbon and noble gas mixtures were used to deposit the films. The hybrid technique of plasma immersion ion implantation and deposition (PIIID) was used, applying high voltage negative pulses to the samples to promote deposition under ion bombardment. Acetylene (C2H2) diluted in argon was used as the gas mixture for film formation. The effect of the pulse magnitude and plasma pressure on the properties of the films, were studied. Infrared and Raman spectroscopies were employed to evaluate the film chemical composition and microstructure. Via the infrared spectra was observed a decrease in the C-H and O-H band intensities with increasing pulse magnitude, but a rise in the gas pressure caused the intensity of C-H bands to increase. Raman spectra of all the films exhibited strong photoluminescence, indicating a significant hydrogen content. The receptivity of the films to water was analyzed by contact angle ( ) measurements, which revealed a moderate affinity for water ( ~ 80 ) as a consequence of the low concentrations of polar groups on the film surface. The surface topography was determined by profilometry and atomic force microscopy (AFM), while the surface morphology was investigated by scanning electron microscopy (SEM), respectively. Roughness results, measured in Ra, were strongly dependent on the material employed as the substrate: polished AISI M2 steel or AISI M2 steel containing TiN. The greatest value of the substrate roughness, Ra 1172 A, was obtained for the samples prepared with the AISI M2 steel with TiN layer, and the lowest, Ra 73 A, for the samples prepared with polished AISI M2 steel. After the PIIID deposition, the roughness tended to increase with greater pulse" @default.
• W755629294 created "2016-06-24" @default.
• W755629294 creator A5056061682 @default.
• W755629294 date "2011-07-22" @default.
• W755629294 modified "2023-09-23" @default.
• W755629294 title "Efeito protetivo produzido pela aplicação de um filme de carbono amorfo na superfície de um ferramental para conformação" @default.
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