Effect of nitrogen in the properties of diamond-like carbon (DLC) coating on Ti6Al4V substrate

Autor(es)

Almeida, L. S. ^{[1, 2]} ; Souza, A. R. M. ^[2] ; Costa, L. H. ^[3] ; Rangel, E. C. ^[4] ; Manfrinato, M. D. ^{[1, 2, 5]} ; Rossino, L. S. ^{[1, 2, 5]}

Afiliação do(s) autor(es)

^[1] Sorocaba Technol Coll FATEC, Ave Engn Carlos Reinaldo Mendes, BR-18013280 Sorocaba, SP - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Campus Sorocaba, Rodovia Joao Leme Santos, Km110, BR-1805780 Sorocaba, SP - Brazil

^[3] Univ Estadual Campinas, Sch Elect & Comp Engn, Carbon Sci Tech Labs, Ave Albert Einstein 400, BR-13083852 Campinas, SP - Brazil

^[4] Paulista State Univ UNESP, Campus Sorocaba, Ave 3 Marco, BR-51118087 Sorocaba 180, SP - Brazil

^[5] Rangel, E. C., Paulista State Univ UNESP, Campus Sorocaba,Ave 3 Marco, BR-51118087 Sorocaba 180, SP, Brazil.Almeida, L. S., Sorocaba Technol Coll FATEC, Ave Engn Carlos Reinaldo Mendes, BR-18013280 Sorocaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH EXPRESS; v. 7, n. 6 JUN 2020.
• Citações Web of Science: 0

Resumo

The great interest in the study of diamond-like carbon films (a-C:H) is justified by its mechanical and tribological properties. However, the high internal stress of the film results in its difficult adhesion to the metallic substrate, which can be solved by nitrogen incorporation in the a-C:H film, allowing a formed film of lower internal stress. The objective of this work is to evaluate the influence of flow (20, 30 and 40sccm), CH4/Ar ratio (90/10 and 70/30) and voltage (400, 500, 600 and 700 V) in the a-C:H formation. For the best condition of the film, we studied the effect of nitrogen incorporation in the hardness and wear resistance of the a-C:H(N), modifying the nitrogen percentage in the treatment at 10% to 60% N-2. The treatments were carried out in the Ti6Al4V substrate by DC-PECVD for two hours. For good adhesion of the films on the substrate, a silicon interlayer must be produced. The increase in the voltage above 600 V increases the I-D/I-G and film thickness, causing its delamination, and the gas ratio did not influence the a-C:H characteristics. The a-C:H film deposited with 30 sccm, 90/10 and 500 V was characterized as a-C:H (hard), with properties such as the hardness of 17 GPa, 30% H, 39% sp(3) and I-D/I-G ratio of 0.58. Since nitrogen reduced the deposition rate, the total gas flow for the production of a-C:H(N) was performed with 40 sccm. The Raman spectra of a-C:H(N) films showed changes in D band intensity and displacement in relation to the nitrogen-free film spectrum, evidencing the incorporation of nitrogen in the film. The XPS analysis showed the linear increase of the nitrogen incorporation in the a-C:H(N) film with the increase of the amount of the N-2 gas in the treatment, which caused, in general, a decrease in the amount of C-C sp(3) bonding, increasing the adhesion of the film in the substrate and not necessarily the low wear resistance of the formed film. (AU)

• Processo FAPESP: 17/12288-0 - Estudo do efeito do nitrogênio nas propriedades de filme DLC obtido por PECVD
• Beneficiário: Larissa Solano de Almeida
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica