@InProceedings{DammPGCCVTVBC:2019:StChVa,
author = "Damm, Djoille Denner and Pinheiro, Rom{\'a}rio Ara{\'u}jo and
Gomez, Javier Sierra and Contin, A. and Correia, R. F. B. and
Volu, R. M. and Trava-Airoldi, Vladimir Jesus and Vasconcelos, G.
de and Barquete, D. M. and Corat, Evaldo Jos{\'e}",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade Federal de
Goi{\'a}s (UFG)} and {Universidade Federal de S{\~a}o Paulo
(UNIFESP)} and {Instituto de Estudos Avan{\c{c}}ados (IEAv)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
de Estudos Avan{\c{c}}ados (IEAv)} and {Universidade Estadual de
Santa Cruz (UESC)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Study and characterization of the vanadium carbide interlayer
deposited by laser cladding over carbon steel for CVD diamond
growth",
year = "2019",
organization = "International Conference on Metallurgical Coatings and Thin Films
(ICMCTF), 46.",
abstract = "Vanadium carbide has been used in the industry to improve the
steel properties. It was extensively studied and explored by
Toyota a few decades ago. Vanadium has high hardness, as well as
carbides forming ability, chemical compatibility with carbon steel
and CVD diamond and an intermediate thermal expansion coefficient
(TEC) between these materials. These characteristics make vanadium
carbide attractive as an intermediate layer for CVD diamond
applications. There are many techniques to obtain a vanadium
carbide interface such as thermodiffusion and sputtering. In this
work, we will discuss the vanadium carbide deposition by laser
cladding on carbon steel surface. The main problems in growing CVD
diamond directly on steel surface are related crystallinity,
purity and adhesion. The crystallinity issue is due to the fact
that the gas phase carbon goes in to the steel substrate bulk
causing its embrittlement and reducing diamond growth rate. The
problem regarding purity is related to the transitions metals
present in the steel surface (such as iron and cobalt) that
inhibit the sp3 bond over the sp2 bond, providing the appearance
of graphite on CVD film that reduces the film quality. As for the
Adhesion challenge, the TEC mismatch results in a high residual
compressive tension in the diamond film, which causes delamination
during cooling. Therefore, an intermediate layer is necessary to
create a transition zone able to relieve the thermal residual
stress and also to act as a diffusional barrier. The laser
cladding was selected because of its rapid processing, excellent
metals adhesion by melting, good surface finish reducing roughness
and capacity to preserve the original properties of the material
substrate interacting only with the up layers of the material. In
this study, we analyze vanadium carbide phase formation by varying
systematically the following parameters: resolution (300 900 DPI);
scanning speed (100 500 mm/s); and output power (40 125 W). For
the substrate we used AISI D6, AISI O1 and AISI M2 steels. The
HFCVD films were grown using the following parameters: 2 sscm of
CH4; 98sccm of H2; 2h deposition process time; 700°C and 5mm of
work distance. The results of LCVC coating and HFCVD films
characterizations were obtained by X-ray diffraction, scanning
electron microscope field emission (SEM-FEG) and Raman
spectroscopy.",
conference-location = "San Diego, CA",
conference-year = "19-24 May",
language = "en",
urlaccessdate = "01 maio 2024"
}