| Texto completo | |
| Autor(es): |
Vieira, Jose
[1]
;
Contin, Andre
[2]
;
Fraga, Mariana Amorim
[3]
;
Corat, Evaldo Jose
[1]
;
Airoldi, Vladimir Trava
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SURFACE INNOVATIONS; v. 7, n. 1, p. 4-11, MAR 2019. |
| Citações Web of Science: | 1 |
| Resumo | |
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) | |
| Processo FAPESP: | 14/18139-8 - Estudos de crescimento e de dopagens de diamante-CVD mono cristalino, colorido via descarga em mW 2,45 GHz de alta potência |
| Beneficiário: | Mariana Amorim Fraga |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/25939-8 - Estudo de interfaces aplicadas por laser cladding para deposição de diamante CVD |
| Beneficiário: | Andre Contin |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 12/15857-1 - Estudos científicos e aplicações inovadoras em diamante-CVD, Diamond-Like Carbon (DLC) e carbono nanoestruturado, obtidos por deposição química na fase vapor |
| Beneficiário: | Vladimir Jesus Trava-Airoldi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |