HFCVD nanocrystalline diamond coatings for tribo-applications in the presence of water

resumo

Nanocrystalline diamond (NCD) is increasingly popular as engineered surface coatings intended for tribo-mechanical applications. Sliding may occur in the presence of water, or aqueous solutions, for example in mechanical face seals, MEMS, or in preliminary testing bearing surfaces for biotribological applications. NCD coatings of 20 pm thickness were grown by the hot-filament chemical vapour deposition (HFCVD) method on Si(3)N(4) ceramic substrates. The water lubricated NCD/NCD tribosystem was studied in an oscillating bail-on-flat tribometer. For all loading conditions up to the threshold load prior to film delamination (85 N), very low friction coefficient values (mu similar to 0.02 to 0.05) combined with a high wear resistance (10(-9) to 10(-8) mm(3)N(-1)m(-1))were observed. (C) 2008 Elsevier B.V. All rights reserved.

palavras-chave

COATED SILICON-NITRIDE; CVD DIAMOND; PERFORMANCE; FRICTION; TRIBOSYSTEMS; COMPOSITES; BEHAVIOR; LOAD

categoria

Materials Science

autores

Abreu, CS; Amaral, M; Oliveira, FJ; Gomes, JR; Silva, RF

nossos autores

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