Measurement of semi-volatiles in used natural gas engine oil using thermogravimetric analysis
Measurement of semi-volatiles in used natural gas engine oil using thermogravimetric analysis
复制标题
使用热重分析法测量废天然气发动机油中的半挥发物
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. J. Truhan
中科院分区：
文献类型：
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作者：
G. Mullins;J. J. Truhan
摘要内燃机润滑油中的半挥发性物质不仅会影响润滑油的使用寿命，而且会导致润滑油在缸内形成存款。为了测量半挥发物含量，一个新的热重分析（TGA）程序已从现有的烟灰程序，以确定半挥发性化合物的水平在逐渐老化的润滑油样品从天然气发动机测功机测试单元运行。当在惰性气氛中以恒定速率加热时，在550 °C下剩余的重量百分比随运行时间、粘度以及氧化和硝化而线性变化。该方法产生了可重复的运行到运行的结果，并表现出良好的协议之间的氦气和氩气气氛。质谱数据证实了发动机运行期间高分子量物质的水平增加。该方法适用于柴油机油样品。
Abstract Semi-volatile in internal combustion engine lubricating oil may be responsible for limiting service life and can lead to in-cylinder deposit formation. In order to measure semivolatile content, a new thermogravimetric analysis (TGA) procedure has been adapted from existing soot procedures to determine the levels of semi-volatile compounds in progressively aged lubricating oil samples from a natural gas engine dynamometer test cell run. The per cent weight remaining at 550 °C, while heated at a constant rate in an inert atmosphere, varied linearly with running time, viscosity, and oxidation and nitration. The method yielded reproducible run-to-run results and showed good agreement between helium and argon atmospheres. Mass spectroscopy data confirmed increased levels of high molecular weight species during engine operation. This method may be applicable to diesel engine oil samples.