食品级滑石粉对复合铝基润滑脂摩擦学性能的影响  

Effect of Food-Grade Talc on Tribological Properties of Composite Aluminum-Based Grease

作　　者：巩龙飞 钱善华 王韦 倪自丰 任海栋 GONG Longfei;QIAN Shanhua;WANG Wei;NI Zifeng;REN Haidong(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangsu Wuxi 214122,China;School of Mechanical Engineering,Jiangnan University,Jiangsu Wuxi 214122,China;Wuxi Beilei New Material Technology Consulting Co Ltd,Jiangsu Wuxi 214072,China)

机构地区：[1]江苏省食品先进制造装备技术重点实验室,江苏无锡214122 [2]江南大学机械工程学院,江苏无锡214122 [3]无锡钡镭新材料技术咨询有限公司,江苏无锡214072

出　　处：《摩擦学学报》2021年第6期833-842,共10页Tribology

基　　金：国家自然科学基金项目(51775244);江苏省食品先进制造装备技术重点实验室自主研究课题(FMZ201907)资助。

摘　　要：通过白油和稠化剂制备了复合铝基脂,在MFT-5000磨损试验机上研究了食品级滑石粉(Food-grade talc,FTalc)质量分数对润滑脂摩擦学性能的影响,并采用MFP-D白光干涉仪、电化学工作站及X射线光电子能谱仪(XPS)表征磨痕表面.结果表明:通过李斯特菌检测发现所制备的润滑脂具有较好的安全性,另外其锥入度和滴点的指标良好;F-Talc能够改善复合铝基润滑脂的热稳定性能和摩擦学性能;与基础脂相比,F-Talc的质量分数为1.0%的润滑脂摩擦系数降低了约25%,磨损体积降低了约47%.机理分析可知,F-Talc易在摩擦副表面形成润滑膜,且部分F-Talc能够发挥修补及微抛光的作用,提高润滑脂的抗磨性能.In order to improve the anti-wear performance of as-prepared food-grade grease and enlarge its service life,it is necessary to adopt new additives and investigate their influence the on the tribological properties of the as-prepared food-grade greases.In the study,composite aluminum-based grease was prepared by food-grade white mineral oil and composite aluminum soap thickener.The food-grade talc(F-Talc)was selected as the additive,and its morphology and structure were characterized by scanning electron microscopy and fourier transform infrared spectrometer.The influence of F-Talc mass fraction on thermal stability and tribological properties of the as-prepared composite aluminum-based grease were investigated using Q500 thermogravimetric analyzer and MFT-5000 wear tester with the ball-disc rubbing pair,respectively.The wear scar surfaces of the steel disc were characterized by means of MFP-D white light interferometer,CHI660E electrochemical workstation and 250Xi X-ray photoelectron spectroscopy.Moreover,the safety performances of the composite aluminum-based grease and F-Talc were evaluated using the Listeria monocytogenes method.The results showed that as-prepared composite aluminum-based grease and F-Talc additivecontaining grease were verified to be safe by the Listeria monocytogenes method.After F-Talc was added,the dropping point of as-prepared composite aluminum-based grease was increased slightly,but F-Talc had little role on the cone penetration of the as-prepared grease.It was observed that the microscopic morphology of the F-talc powder had a layered structure,implying that F-Talc had a tendency to split into mackerel scales and exhibited the special lubricity.Compared with the as-prepared base grease,the epitaxy initial degradation temperature of as-prepared composite aluminum-based grease containing 1.0%F-Talc increased from 309℃to 320℃,corresponding to an increase of about 3.6%.As the final degradation temperature was reached,the residual weight of the as-prepared grease including the FTalc add

关 键 词：食品级润滑脂 复合铝基脂 食品添加剂 李斯特菌法 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]