화학공학소재연구정보센터
Applied Surface Science, Vol.201, No.1-4, 115-122, 2002
Adsorption and reactions of HFC-134a gas on the nascent surface of alumina
The adsorption and tribochemical reactions of HFC-134a (CF3CH2F) gas on the nascent surface of alumina (Al2O3) couple were investigated using an adsorption test apparatus in high vacuum at room temperature. The adsorption of HFC-134a and the desorption of the product gas of trifluoroethylene (CF2=CHF) were detected during the rubbing processes with a quadrupole mass spectrometer. The adsorption rate of HFC-134a molecules was estimated to be (0.5-2.2) x 10(13) molecules/s in this experiment, and it increased with increasing pressure of the source gas and the sliding velocity. It was found that the desorption rate of CF2=CHF was proportional to the adsorption rate of HFC-134a.. XPS analysis revealed that AlF3, AlFxOy and fluorinecontaining polymers were formed on the worn surface. Reaction mechanism of HFC-134a molecules on the nascent surface of Al2O3 was also proposed.) (C) 2002 Elsevier Science B.V All rights reserved.