层状硅酸钠的油酸改性及摩擦学性能研究

Organic Modification and Tribological Properties of Layered Sodium Silicate

用油酸对层状硅酸钠表面进行改性,得到改性层状硅酸钠,用沉降体积、红外光谱对改性效果进行表征.把改性层状硅酸钠作为润滑添加剂分散到500 SN基础油中,用HQ-1摩擦磨损试验机考察了其摩擦学性能,用扫描电子显微镜观察了磨痕表面形貌,探讨了改性层状硅酸钠的减摩抗磨机理.结果表明:改性层状硅酸钠在150 SN基础油中具有良好的分散稳定性;改性层状硅酸钠作为润滑添加剂可以显著提高500 SN基础油的减摩性能,在质量分数为0.8%时,摩擦因数最小,油样温升最小,试块磨损量最小;层状硅酸钠晶层之间的滑动有效降低了摩擦副的摩擦磨损.

Layered sodium silicate was modified using oleic acid as modifier. The modification results were characterized by sedimentation volume analysis, FT-IR . Modified layered sodium silicate was added into 500 SN base stock as additive and its tribological characteristic was evaluated on HQ-1 ring-on-block tribometer. The morphologies of worn steel surfaces lubricated with different lubricant systems were observed on a scanning electron microscope. Friction reducing and anti-wear mechanics of additive were also discussed. The experimental results indicated that modified layered sodium silicate could be well dispersed in 150 SN base stock and had good stability, and is can improve significantly friction reducing and anti-wear abilities of 500 SN base stock as additive. When mass fraction of additive is 0.8%, friction coefficient is smallest, oil temperature rise lowest, and wear loss of test block least. Reciprocal rubbing between crystal layers decrease effectively wear and abrasion of friction pairs.