CAJ | 학술논문

用高压差示扫描量热（PDSC）程序升温法和恒温法对在用汽油机油的氧化安定性进行了研究。结果表明随着行车里程数的增加,在用汽油机油的起始氧化温度（Ton）和氧化峰值（Tp）不断降低,氧化诱导期时间（OIT）不断缩短,这一结果与油品酸值的增加趋势和碱值的降低趋势相符,均反映了油品在行车试验中的氧化衰败过程。因此PDSC程序升温法和恒温法均可用于在用汽油机油的氧化安定性评价,但是程序升温法与恒温法相比,具有测试条件选择简单的优势,故在对在用汽油机油的氧化安定性进行评价时推荐使用程序升温法。
용고압차시소묘량열（PDSC）정서승온법화항온법대재용기유궤유적양화안정성진행료연구。결과표명수착행차리정수적증가,재용기유궤유적기시양화온도（Ton）화양화봉치（Tp）불단강저,양화유도기시간（OIT）불단축단,저일결과여유품산치적증가추세화감치적강저추세상부,균반영료유품재행차시험중적양화쇠패과정。인차PDSC정서승온법화항온법균가용우재용기유궤유적양화안정성평개,단시정서승온법여항온법상비,구유측시조건선택간단적우세,고재대재용기유궤유적양화안정성진행평개시추천사용정서승온법。
Oxidation stability of the used gasoline engine oil was studied by isothermal and programmed ramp methods of Pressure Differential Scanning Calorimetry (PDSC). The result showed that the oxidation onset temperature (Ton), oxida- tion peak temperature (Tp) and oxidation induction time (OIT) reduce with the increase of mileage. These results are con- sistent with the change trend of the basic number and acid number, which indicate the isothermal method and programmed ramp method are effective in oxidation stability evaluation. Moreover, comparing with the isothermal method, the pro- grammed ramp method has the advantage of simple test conditions. Thereby, the programmed ramp method is recommen- ded when oxidation stability is evaluated by PDSC.