通过加速老化模型预测浸没液的稳定性窗口.pdf

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1、Predicting immersion fluids stability window through accelerated aging modelIndustrial Technology Research InstitutePredicting immersion fluids stability window through accelerated aging modelCOOLING ENVIRONMENTSCHEN-KUANG CHIANGAssociated Researcher/Industrial Technology Research InstituteOutline 5

2、4321Introduction to fluid aging:behaviors and underlying mechanismsConcept of chemical stability time though accelerated methodConclusions,future work and call for actionCase share:Hydrocarbon,ester and silicon oilCurrent method to analysis reliability of fluids Fluid agingMarker reagentIntroduction

3、 to fluid aging:behaviors of aged fluidMost Cooling fluids tend to lose key properties over time due to material aging.Degraded fluids may lead to equipment failures Therefore,fluid stability analysis is critical to ensure system reliability.Therefore,fluid stability analysis is critical to ensure s

4、ystem reliability.Sludge existSludge exist115,6 Week115,3 Week115,12WeekUnderlying Mechanisms of aging processRHRHR R+H+H(slow)slow)(E(E1 1)R+O O2 2 ROO(O2)(E2)ROO+RH ROOH+R(E3)ROOH RO+OH(metal)(E4)RO+RH+O2 ROH+ROO(E5)OH+RH+O2 H2O+ROO(E6)R+R RR(E7)R+ROO ROOR(E8)Mechanism of oxidationMechanism of oxi

5、dationMolecules SludgeSmall substancesRRH2ODissociationHydrolysisCorrosion AccelerationR-O-O-HR-O-O-RAlcoholKetoneAldehydeAcidH H positionpositionBond energy(KJ/mole)H H-CH2-CH2-R419H H-CH2-CH=R356R=CH-H HCH-CH=R227=f(Temp,O2,cata.,pressure,active energy).One radical can generate 103or above radical

6、s.Result of aging fluids through existing methodFluidCxHyCxHy-agedesterester-agedSilicone oilSilicone oil-agedThermogravimetric loss(5%,)260250153149147186viscosity(cP)707510102125acidity(mg KOH/g)0.0171.4400.0210.0320.0111.432BDV(kV)15.730.872.836.829.528.8Dk(F/m)10 GHz1.962.022.342.462.422.45Df(F/