Temperature influence on the interlayer and surface morphology of diamond coating on 3D porous titanium substrates

Autor(es)

Braga, N. A. ^[1] ; Cairo, C. A. A. ^[2] ; Almeida, E. C. ^[1] ; Baldan, M. R. ^[1] ; Ferreira, N. G. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, BR-12245970 Sao Jose Dos Campos, SP - Brazil

^[2] CTA, Comando Geral Tecnol Aeroespacial, BR-12228904 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: DIAMOND AND RELATED MATERIALS; v. 18, n. 9, p. 1065-1069, SEP 2009.
• Citações Web of Science: 17

Resumo

Nanocrystalline (NCD) and/or microcrystalline (MCD) diamond films grown on three-dimensional porous titanium (Ti) substrate were obtained by hot filament chemical vapor deposition (HFCVD) technique. The morphology variation of diamond films grown on porous three-dimensional titanium Substrate was studied at four different deposition temperatures to investigate their influence on nucleation density. Scanning electron microscopy images depicted the continuous change from microcrystalline diamond grains with a random crystallographic orientation, at 500 degrees C and 600 degrees C. to a cauliflower-like structure for deposits at 700 degrees C and 800 degrees C. Visible Raman spectroscopy confirmed the good quality of diamond films and revealed that the amount of amorphous carbon increased associated to the film morphology changes from MCD to NCD. X-ray diffraction analyses, performed both through theta-2 theta scans and at grazing incidence angle, allowed the investigation of the crystallographic properties and structural evolution of the different film/substrate interface phases, such as TiC(111). TiC(200) and TiH(2). The results revealed that the temperature enhanced the nucleation sites for diamond growth. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/00013-4 - Novos materiais, estudos e aplicações inovadoras em diamante-CVD, diamond-like-carbon (DLC) e carbono nanoestruturado obtidos por deposição química a partir da fase vapor
• Beneficiário: Evaldo Jose Corat
• Modalidade de apoio: Auxílio à Pesquisa - Temático