XPS, XRD and laser raman analysis of surface modified of 6150 steel substrates for the deposition of thick and adherent diamond-like carbon coatings

Materials Research

William De Melo Silva²  José Rubens Gonçalves Carneiro²  Vladimir Jesus Trava-airoldi¹ 

[1] ,Pontifical Catholic University of Minas Gerais Department of Mechanical Engineering Belo Horizonte MG ,Brazil

关键词: diamond-like carbon;    adhesion;    nitriding;    scratching test;    plasma enhanced chemical vapor deposition;   

DOI  :  10.1590/S1516-14392013005000027

来源: SciELO

【 摘 要 】

Although the 6150 steel has an excellent fatigue and impact resistance, it is unsuitable to operate it when the corrosion is a limited factor. We propose here a sequence of steel pre-treatment by carburizing, carbonitriding and nitriding in order to improve the poor adhesion between Diamond Like-Carbon coatings on steel. This sequence is our attempt to reduce the difference between the coefficients of thermal expansion of steel and DLC through the graded interface. This work demonstrates the quantitative analysis of the molecules present at surface using X-ray photoelectron spectroscopy. The crystallographic structures are investigated by X-ray diffraction which shows the formation of carbides and nitride phases. Raman spectroscopy reveals the carburizing surface characteristics where DLC coating is nucleated and grown at the substrate. At the end of the analysis it is possible to verify which molecules and phases are formed on the steel surface interface after each step of pre-treatment.

【 授权许可】

CC BY   
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