镧化合物对煤间接液化柴油碳烟颗粒摩擦学特性的影响

目的 研究镧化合物对含煤间接液化柴油碳烟润滑油摩擦磨损性能的影响.方法 利用四球长时摩擦磨损试验机,分别考察不同浓度氟化镧(LaF3)和氧化镧(La2O3)对含煤间接液化柴油碳烟(Fischer-Tropsch synthesis diesel soot,F-T DS)与0#柴油碳烟(Diesel soot,DS)白油的润滑性能的影响,利用多功能万能工具显微镜、扫描电镜与能谱、X射线光电子能谱等仪器对磨斑直径、结构、形貌、组成及元素价态进行表征.结果 在含F-T DS白油体系中,添加0.4％(质量分数)镧化合物LaF3或La2O3时,减摩抗磨效果最优,平均摩擦系数(AFC)分别为0.070、0.058,较未添加时(0.094)分别下降25.5％和38.3％,平均磨斑直径(AWSD)分别为0.4318、0.4207 mm,较未添加时减少了33.6％和35.2％.在含DS白油体系中,添加0.6％ 镧化合物LaF3或La2O3时,减摩效果最佳,AFC分别下降11％和16％;添加0.8％ 镧化合物时,抗磨效果最优,AWSD降幅分别为24.8％和33.7％,La2O3抗磨效果优于LaF3.结论 添加少量镧化合物可以改善含F-T DS与DS白油的减摩抗磨效果.其减摩抗磨机理可能是,通过形成转移膜,或在摩擦进程中添加剂吸附在接触表面形成镧系边界润滑保护膜,改善了润滑状态,起到了减摩抗磨作用.

Effects of Lanthanum Compounds on Tribological Properties of Diesel Soot Particles Synthesized by Fischer-Tropsch Process

In order to study the effect of lanthanum compound on the friction and wear properties of Fischer-Tropsch synthesis diesel soot lubricants, the effects of different concentrations of lanthanum fluoride (LaF3) and lanthanum oxide (La2O3) on the lubricating properties of white oil with Fischer-Tropsch synthesis diesel soot (F-T DS) and white oil with 0# diesel soot (DS) were studied respectively by four-ball long-time friction and wear tester. The wear scar diameter, structure, morphology, composition and valence state of elements were characterized by multifunctional tool microscope, scanning electron microscope and energy spectrum, X-ray photoelectron spectroscopy and other instruments. The results showed that the antifriction and anti-wear effect were the best when 0.4% lanthanum compound (LaF3 or La2O3) was added in F-T DS white oil system. The average coefficient of friction (AFC) was 0.070 and 0.058, respectively, which were 25.5% and 38.3% lower than 0.094 when it was not added. The average wear scar diameter (AWSD) was 0.4318 mm and 0.4207 mm, respectively, which were 33.6% and 35.2% less than it was not added. In the DS white oil system, when 0.6% lanthanum compound (LaF3 or La2O3) was added, the anti-friction effect was best, AFC dropped by 11% and 16% respectively. When 0.8% lanthanum compound was added, the anti-wear effect was the best. AWSD fell by 24.8% and 33.7% respectively. The La2O3 has better anti-wear effect than LaF3. The results showed that adding a small amount of lanthanum compound could improve the anti-friction and anti-wear effect of white oil with F-T DS or DS. The friction mechanism analysis may form a transfer film through transfer or the additive is adsorbed on the contact surface during the friction process to form a lanthanum boundary lubrication protective film, which improves the lubrication state and plays a role of anti-friction and anti-wear.