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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Composite intermediate layer for CVD diamond film on steel substrate

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Contin, Andre [1] ; de Vasconcelos, Getulio [2] ; Damm, Djoille D. [1] ; Trava-Airoldi, Vladimir J. [1] ; Campos, Raonei A. [3] ; Corat, Evaldo J. [1]
Total Authors: 6
[1] Natl Inst Space Res, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Inst Adv Studies, BR-12228800 Sao Jose Dos Campos, SP - Brazil
[3] Fed Univ South & Southeast Para, BR-68507590 Maraba, PA - Brazil
Total Affiliations: 3
Document type: Journal article
Source: MRS ADVANCES; v. 2, n. 41, p. 2211-2216, 2017.
Web of Science Citations: 1

The union of the unique diamond properties with steel (most common substrate material) provides a new solution for machine parts under critical mechanical conditions and severe environmental. However, CVD diamond coating directly on steel comes with several issues. The fundamental reasons for the lack of adhesion are an iron catalytic effect, the high carbon solubility in iron and high mismatch in thermal expansion coefficient of diamond and steel. The use of interlayer may solve these issues acting as a diffusion barrier, for both iron and carbon, and match thermal expansion coefficients. Several articles describe the PVD deposition or electroplated interlayer. In the present study, the diamond film coated steel with an intermediate barrier deposited by laser cladding process. In this novel technique, laser irradiation melts the powder (preplaced) and the substrate surface to create the coating on a steel substrate. We used the SiC/Ti and SiC/Cu powder mixtures to create the intermediate barrier. Diamond film deposition was carried out in an HFCVD reactor (Hot Filament Chemical Vapor Deposition). The samples characterization included X-ray Diffraction (XRD); Field Emission Gun - Scanning Electron Microscopy (FEG-SEM) and Raman Scattering Spectroscopy (RSS). Results showed that laser incidence dissociated partially the SiC powder, forming FeSi, Cu3Si phases. Further, the composite layer assisted the high thermal stress relief in steel/diamond interface. (AU)

FAPESP's process: 12/15857-1 - Scientific studies and innovation application on CVD diamond, DLC and carbon nanostructures obtained by chemical vapor deposition technique
Grantee:Vladimir Jesus Trava-Airoldi
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/25939-8 - Study of interfaces by laser cladding for CVD diamond deposition
Grantee:Andre Contin
Support type: Scholarships in Brazil - Doctorate