十六烷基三甲基溴化铵改性 CS 作为润滑添加剂的摩擦学特性

IF 1.6 4区化学 Q4 CHEMISTRY, PHYSICAL

Surface and Interface Analysis Pub Date : 2024-02-26 DOI:10.1002/sia.7297

Jing Li, Tianxia Liu, Jinyu Liu

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引用次数: 0

摘要

煤间接液化柴油烟尘（Coal-to-liquids diesel soot，CS）由自制的烟尘捕集器收集。用十六烷基三甲基溴化铵（CTAB）对 CS 进行改性，命名为 CS-CTAB。在 WTM-2E 可控气氛微型摩擦磨损试验机上测试了 CS 和 CS-CTAB 在 10#白油（10#WO）中的摩擦学特性。利用 TEM、XPS、XRD、拉曼等仪器研究了 CS 和改性 CS-CTAB 的形貌、成分和摩擦学机理。结果表明，CTAB修饰的CS呈长链状缠绕。其主要结构成分均为无定形碳，并含有少量石墨结晶。添加 CS-CTAB（0.8 wt%）后，AFC 和磨损率均显著降低，与不添加相比，AFC 降低了 32.9%，磨损率降低了 65.6%。经 CTAB 改性后，CS 的抗摩擦和抗磨损效果大大提高。机理分析表明，CS 作为一种润滑添加剂，在摩擦过程中起到微轴承的作用，在剪切力的作用下脱落，生成独立的石墨片，从而在 304 不锈钢板表面形成石墨保护膜。但 CS 存在石墨化程度低、粒度大、易团聚等缺陷。在摩擦过程中，表面对 CS 的不均匀吸附会加剧磨损。然而，CTAB 改性可以提高 CS 在 10#WO 中的分散稳定性，并有效减少摩擦表面的磨损。

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Tribological properties of Cetyltrimethyl ammonium bromide modified CS as lubrication additive

The coal indirect liquefied diesel soot (Coal-to-liquids diesel soot, CS) was collected by a self-made soot trapper. CS was modified with cetyltrimethyl ammonium bromide (CTAB) and named as CS-CTAB. The tribological properties of CS and CS-CTAB in 10^#white oil(10^#WO) were tested on a WTM-2E controlled atmosphere miniature friction and wear testing machine. The morphology, composition, and tribological mechanism of CS and modified CS-CTAB were studied by using TEM, XPS, XRD, Raman, and other instruments. The results showed that CS modified by CTAB is wrapped and entangled in long chains. Their main structure components are all amorphous carbon with a small amount of graphite crystallites. The addition of CS-CTAB (0.8 wt%) significantly reduces both AFC and wear rate, with reductions of 32.9% for AFC, and 65.6% for wear rate compared to no additive. The anti-friction and anti-wear effect of CS is greatly improved after being modified by CTAB. Mechanism analysis shows that CS as a lubricant additive, acts as a micro-bearing in the friction process and falls off under the action of shear force to generate an independent graphite sheet, thus forming a graphite protective film on the surface of 304 stainless steel plate. However, CS has the defects of low graphitization degree, large particle size, and easy agglomeration. During friction, uneven adsorption of CS on the surface can worsen wear. However, CTAB modification can improve dispersion stability in 10^#WO and effectively reduce wear on the friction surface.

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来源期刊

Surface and Interface Analysis 化学-物理化学

CiteScore

3.30

自引率

5.90%

发文量

130

审稿时长

4.4 months

期刊介绍： Surface and Interface Analysis is devoted to the publication of papers dealing with the development and application of techniques for the characterization of surfaces, interfaces and thin films. Papers dealing with standardization and quantification are particularly welcome, and also those which deal with the application of these techniques to industrial problems. Papers dealing with the purely theoretical aspects of the technique will also be considered. Review articles will be published; prior consultation with one of the Editors is advised in these cases. Papers must clearly be of scientific value in the field and will be submitted to two independent referees. Contributions must be in English and must not have been published elsewhere, and authors must agree not to communicate the same material for publication to any other journal. Authors are invited to submit their papers for publication to John Watts (UK only), Jose Sanz (Rest of Europe), John T. Grant (all non-European countries, except Japan) or R. Shimizu (Japan only).