CAJ | 학술논문

以纳米TiO2为原料、硬脂酸为表面改性剂，通过超声反应制备了疏水性纳米TiO2（SA-TiO2）；采用扫描电子显微镜（SEM）、红外光谱仪及接触角测量仪对其微结构进行了表征。以SA-TiO2为润滑油添加剂，在四球试验机上考察了其在菜籽油中的摩擦磨损性能，并利用SEM观察钢球表面磨斑形貌，用能谱仪（EDS）和X射线光电子能谱仪（XPS）分析了钢球表面磨斑的化学成分。结果表明：SA-TiO2为疏水性单分散球状颗粒，其平均直径约为20 nm；SA-TiO2能够提高菜籽油的抗磨减摩性能，当SA-TiO2的质量分数为1%，菜籽油的抗磨减摩性能达到最佳；钢球表面磨斑的EDS和XPS分析表明，纳米微粒在钢球摩擦表面形成了一层含菜籽油和SA-TiO2的吸附膜，在摩擦剪切作用下，发生摩擦化学反应生成了一层含钛、铁氧化物的边界润滑膜，这种边界润滑膜起到了良好的润滑作用。
이납미TiO2위원료、경지산위표면개성제，통과초성반응제비료소수성납미TiO2（SA-TiO2）；채용소묘전자현미경（SEM）、홍외광보의급접촉각측량의대기미결구진행료표정。이SA-TiO2위윤활유첨가제，재사구시험궤상고찰료기재채자유중적마찰마손성능，병이용SEM관찰강구표면마반형모，용능보의（EDS）화X사선광전자능보의（XPS）분석료강구표면마반적화학성분。결과표명：SA-TiO2위소수성단분산구상과립，기평균직경약위20 nm；SA-TiO2능구제고채자유적항마감마성능，당SA-TiO2적질량분수위1%，채자유적항마감마성능체도최가；강구표면마반적EDS화XPS분석표명，납미미립재강구마찰표면형성료일층함채자유화SA-TiO2적흡부막，재마찰전절작용하，발생마찰화학반응생성료일층함태、철양화물적변계윤활막，저충변계윤활막기도료량호적윤활작용。
Hydrophobic titanium dioxide composite nanoparticles,abbreviated as SA-TiO2,were prepared via ultrasonic reac-tion method with TiO2 nanoparticles as stock and SA as surface modifier. The microstructure of as prepared SA-TiO2 was character-ized by means of scanning electron microscope, Fourier transform infrared spectrometry and contact angle metrical instrument. Moreover,the friction and wear properties of SA-TiO2 as lubricant additives in rapeseed oil were evaluated with a four-ball friction and wear tester. The morphology as well as elemental composition and chemical characteristics of worn steel surfaces were investi-gated by scanning electron microscope,energy dispersive X-ray spectrometer and X-ray photoelectron spectroscope. Results showed that as-prepared SA-TiO2 particles displayed monodisperse spheres morphology with an average size of about 20 nm,and the mea-surement of contact angle indicated that SA-TiO2 was hydrophobic. In the meantime, SA-TiO2 could improve the anti-wear and fric-tion-reducing capacities of rapeseed oil. The optimal anti-wear and friction-reducing abilities were obtained at an SA-TiO2 content of 1%. EDS and XPS analysis of worn steel surfaces indicated that an absorption film containing rapeseed oil and SA-TiO2 was formed on the rubbing surfaces,and then a boundary lubrication film mainly composed of the oxides of iron and titanium was formed via tri-bological chemical reaction,which provided the rapeseed oil with good lubricating properties.