981 / 2022-07-10 09:29:18

硅烷改性羟基硅酸镁的制备及摩擦学性能研究

采用水热法合成片状纳米羟基硅酸镁，再使用硅烷在酸性溶液中对羟基硅酸镁进行修饰制得硅烷改性羟基硅酸镁纳米材料。采用扫描电镜、X射线衍射仪以及红外光谱等手段对制备的材料进行了表征，结果表明硅烷改性羟基硅酸镁的层间距明显增大，硅烷分子枝接在羟基硅酸镁上。羟基硅酸镁在经过硅烷修饰后分散性得到明显提高。通过四球摩擦磨损试验证明，硅烷插层后的羟基硅酸镁相较于未处理的羟基硅酸镁具有更优良的摩擦学性能。当硅烷插层羟基硅酸镁在PAO10中的质量分数为0.5%时，其磨斑直径相较于含0.5%羟基硅酸镁的PAO10油样和纯PAO10分别减少11%和32.8%。

Magnesium hydroxysilicate nanoplate was synthesized by hydrothermal method, then modified by silane in acidic solution to prepare silane modified magnesium hydroxysilicate nanomaterials. As prepared materials were characterized by scanning electron microscopy, X-ray X-ray diffraction ( XRD ) and infrared spectroscopy ( IR ). The results showed that the interlayer spacing of silane-modified magnesium hydroxysilicate was significantly increased, and silane molecules were grafted on magnesium hydroxysilicate. The dispersion of magnesium hydroxysilicate was significantly improved after silane modification. The four-ball friction and wear tests results show that the silane-intercalated magnesium hydroxysilicate was of better tribological properties than the parent magnesium hydroxysilicate. Compared with the pure PAO 10 containing 0.5wt% parent magnesium silicate and pure PAO 10，the wear scar diameter of PAO 10 containing 0.5wt% silane intercalated magnesium silicate was reduced by 11.0 % and 32.8 % respectively.