月桂酸插层Mg/Al-NO_3^--LDHs及其摩擦性能评价  

Preparation of Mg/Al-NO_3^--LDHs Intercalated with Dodecanoic Acid and Investigation of Its Tribological Characteristics

作　　者：赵栋[1] 白志民[1] 

机构地区：[1]中国地质大学材料科学与工程学院,北京100083

出　　处：《硅酸盐通报》2012年第4期841-846,851,共7页Bulletin of the Chinese Ceramic Society

摘　　要：采用液相共沉淀法制备了Mg/Al-NO3--LDHs;以月桂酸为插层剂,采用离子交换法对合成产物进行了插层改性;采用X射线衍射(XRD)、热重及差热分析(TG-DTA)、红外光谱(FT-IR)、扫描电镜(SEM)、比表面积分析仪、四球摩擦实验机和齿轮实验机等对合成产物的结构和性能进行了评价。结果表明,插层前,晶体呈六方片状,晶片大小在50～70 nm,比表面积较大(137.66 m2/g)。月桂酸插层后,产物的通道高度增加,但比表面积显著降低;Mg/Al-NO3--LDHs及其月桂酸插层产物可明显降低金属摩擦副的摩擦系数、磨斑直径、润滑介质温度以及驱动电机功耗,是具有良好应用前景的润滑-减摩-节能材料。Dodecanoic acids were intercalated into magnesium aluminum layered A1-NO^-LDHs） prepared by coprecipitation by the method of anion exchange. double hydroxides （ Mg/ The obtained compounds were characterized by X-ray diffraction, fourier transform infra-red, ghenno-gravimetic/differential thermal analyzer, scanning electron microscope and surface area analyzer. The tribological performances of LDHs in base oil were studied by four-ball wear machine and gear testing machine. These results indicated that the crystal shape is hexagonal flake with crystal size of 50-70 nm and larger specific surface area of 137.66 m2/g before intercalation. After intercalation, the channel height of Mg/A1-NO3-LDHs increases, but the specific surface area decreases significantly. Mg/Al-NO3-LDHs and its products intercalated with dodecanoic acid can significantly reduce the friction coefficient, wear scar diameter, lubrication medium temperature and drive motor power, and are with good prospect of application in lubrication-antifriction-energy saving materials.

关 键 词：镁铝类水滑石 月桂酸 插层 摩擦性能 

分 类 号：O641[理学—物理化学]