(Ti,Sn) Solid Solution Based Gas Sensors for New Monitoring of Hydraulic Oil Degradation

The proper operation of a fluid power system in terms of efficiency and reliability is directly related to the fluid state; therefore, the monitoring of fluid ageing in real time is fundamental to prevent machine failures. For this aim, an innovative methodology based on fluid vapor analysis through...

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Bibliographic Details
Published in:Materials 2021-01, Vol.14 (3), p.605
Main Authors: Fioravanti, Ambra, Marani, Pietro, Massarotti, Giorgio Paolo, Lettieri, Stefano, Morandi, Sara, Carotta, Maria Cristina
Format: Article
Language:English
Subjects:
Aging
Fluid power
Functional materials
Gas sensors
Gases
Hydraulics
Laboratories
Lubricants & lubrication
Metal oxides
Monitoring
Morphology
Screen printing
Semiconductors
Sensors
Solid solutions
Titanium
Viscosity
Working hours
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Summary:The proper operation of a fluid power system in terms of efficiency and reliability is directly related to the fluid state; therefore, the monitoring of fluid ageing in real time is fundamental to prevent machine failures. For this aim, an innovative methodology based on fluid vapor analysis through metal oxide (shortened: MOX) gas sensors has been developed. Two apparatuses were designed and realized: (i) A dedicated test bench to fast-age the fluid under controlled conditions; (ii) a laboratory MOX sensor system to test the headspace of the aged fluid samples. To prepare the set of MOX gas sensors suitable to detect the analytes' concentrations in the fluid headspace, different functional materials were synthesized in the form of nanopowders, characterizing them by electron microscopy and X-ray diffraction. The powders were deposited through screen-printing technology, realizing thick-film gas sensors on which dynamical responses in the presence of the fluid headspace were obtained. It resulted that gas sensors based on solid solution Ti Sn O with x = 0.9 and 0.5 offered the best responses toward the fluid headspace with lower response and recovery times. Furthermore, a decrease in the responses (for all sensors) with fluid ageing was observed.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14030605