二次插层法制备纳米石墨片的摩擦学性能

Antifriction Effect of Graphite Nanosheets Prepared by Re-intercalating Method

以双氧水为氧化剂,硫酸为插层剂,对天然石墨进行插层、膨化处理获得一次可膨胀石墨和一次膨胀石墨。分别对一次可膨胀石墨和一次膨胀石墨进行二次插层、膨化处理,获得两种二次插层膨胀石墨。将上述膨胀石墨进行超声波剥离制备纳米石墨片。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)对相应产物进行表征,将纳米石墨片加入润滑油中,研究其摩擦学性能。结果表明,二次插层可降低纳米石墨片厚度,尤其是对膨胀石墨进行二次插层处理,平均厚度为4.5 nm。纳米石墨片作为润滑油添加剂具有良好的减摩效果,其中对膨胀石墨二次插层制备的纳米石墨片减摩效果较优。

Use H2O2 as the oxidizing agent and H2SO4 as the intercalating agent,natural graphites were treated by intercalating and expanding,forming one-time expandable graphite and expanded graphite.Two secondary expanded graphites were prepared by re-intercalating and expanding the as-prepared one-time expandable graphite and one-time expanded graphite,respectively.Graphite nanosheets were prepared by sonicating these expanded graphites.XRD,SEM and TEM were used to characterize the products.Graphite nanosheets were added to the lubricating oil and its friction property was studied.The results display that re-intercalating treatment can reduce the thickness of graphite nanosheets,especially for the treatment of expanded graphite,its average thickness is 4.5 nm.Graphite nanosheets display a well antifriction property added to the lubricating oil,among which the antifriction effect of the graphite nanosheets resulted from the secondary expanded graphite by re-intercalating expanded graphite is better.