Growth and characterization of multilayer hot-filament chemical vapor deposition diamond coatings on WC-Co substrates

Author(s)

Vieira, Jose ^[1] ; Contin, Andre ^[2] ; Fraga, Mariana Amorim ^[3] ; Corat, Evaldo Jose ^[1] ; Airoldi, Vladimir Trava ^[1]

Affiliation

^[1] Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos - Brazil

^[2] Univ Fed De Goias, Aparecida De Goiania - Brazil

^[3] Univ Brasil, Sao Paulo - Brazil

• Document type: Journal article
• Source: SURFACE INNOVATIONS; v. 7, n. 1, p. 4-11, MAR 2019.
• Web of Science Citations: 1

Abstract

The diamond coating of tungsten carbide (WC)-cobalt (Co) hard metals has been the focus of various research activities mainly due to growing interest in diamond-coated tools for industrial machining of different materials. In this work, multilayered diamond coatings have been grown on pretreated tungsten carbide-cobalt substrates by hot-filament chemical vapor deposition. Two types of multilayer coatings have been prepared: (a) three-layer (alternating nanocrystalline diamond and microcrystalline diamond films) and (b) five-layer (alternating ultrananocrystalline and microcrystalline diamond films). The morphology, roughness, structure, thickness, adhesion of these coatings have been investigated using atomic force microscopy, field emission gun scanning electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy, nanoindentantion and Rockwell C indentation tests at 600 N load. Raman spectra of the two types of samples exhibited sharp characteristic bands of nanocrystalline diamond and a centered peak at 1340 cm(-1). The displacement of this peak in relation to the natural diamond peak (1332 cm(-1))can be attributed to graphitic inclusions in diamond grain boundaries and the thermal coefficient mismatch of the multilayer coating-substrate system. Roughness surface measurements showed very smooth surfaces for both samples. Although the substrate has a high binder content, the results show that well-adhered chemical vapor deposition diamond multilayer coatings were produced. (AU)

• FAPESP's process: 14/18139-8 - Growth and doping studies of mono-crystalline CVD-diamond, dye-colored via discharge of high-power mW 2.45 GHz
• Grantee: Mariana Amorim Fraga
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/25939-8 - Study of interfaces by laser cladding for CVD diamond deposition
• Grantee: Andre Contin
• Support Opportunities: Scholarships in Brazil - Doctorate
• 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 Opportunities: Research Projects - Thematic Grants