Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
DESIGN AND INSTRUMENTATION OF A LOW-COST RAMAN EXPECTROMETER FOR IN-SITU TRIBOLOGICAL ANALYSIS
Submission Author:
Francisco Alves Maia de Almeida Júnior , RN , Brazil
Co-Authors:
Francisco Alves Maia de Almeida Júnior, Gustavo Moura de Miranda Henriques, Salete Alves
Presenter: Salete Alves
doi://10.26678/ABCM.COBEM2021.COB2021-0875
Abstract
Raman spectroscopy has a lot of prominence when used in conjunction with microscopic characterizations, mainly in the evaluation of tribological systems. This technique of vibrational spectroscopy does not require initial sample preparation, and there are even cases where the use of the technique has become viable in the evaluation of sliding surfaces in real time. In lubricated tribological contacts, film formation occurs through mechanisms that need to be identified, which reinforces the use of this equipment for in-situ evaluations in sliding systems. This work proposes the design and instrumentation of a low-cost Raman spectrometer, for the assessment of tribological systems in real time. In this project, the efficient assembly of all the components necessary for tribology applications was considered, the prototype was all modeled in CAD software, using the main components indicated in the literature and the necessary fixing and alignment accessories for the alignment. of the system. Due to the smaller number of components, the mounting configuration used was 180 ° (backscatter), the laser used was the DPSS type with a wavelength of 532 nm, with a reflectance probe and a microscope objective lens. The spectrometer was assembled and tested in a pin-on-disk tribometer and lubricated with epoxidized soybean oil. A AISI 1045 steel disc and AISI 52100 steel ball were used as test specimens, the lubricant used was epoxidized soybean oil and the load tested was 100 N. The results show that the project is feasible and can be used. Coherent spectra were obtained for the intended application, after assembly the spectrometer was tested and spectra coherent with the literature were acquired, during the test the spectrometer acquired the same characteristic spectrum as epoxidized soybean oil, with decreasing intensity over time, that was expected due to the dynamics of the test and the non-renewal of the lubricant in the wear track.
Keywords
Tribology, lubrification, Raman spectroscopy
