摘要
利用NDJ-79旋转黏度计和RS150锥板流变仪测试分析纯锂基脂和含纳米微粒锂基脂的流变性。结果表明:含纳米微粒锂基脂的表观黏度随纳米微粒含量的增加而增大,且加入纳米TiO2后的表观黏度比加入同比例的SiO2的表观黏度要大;纳米微粒含量、皂分含量和温度等因素对含纳米微粒锂基脂表观黏度的影响均显著,并按皂分含量、温度、纳米微粒含量顺序影响依次减弱;纯锂基脂和含纳米微粒锂基脂均存在屈服剪应力,其流变过程表现为塑性流体的特性,流型属于Herschel-Bulkley模型,纳米微粒对流变参数有显著影响,两种脂均存在明显的剪切稀化现象。利用缠结理论和微粒在流场中的取向理论对其流变机制进行探讨。
The rheological properties of lithium greases with and without nano-particles were investigated using NDJ-79 rotational viscometer and RS15 rheometer. The results indicate that the apparent viscosity increases with the increase of nanoparticle concentration with the given ratio of nano-particles added. The apparent viscosity of grease containing nano- TiO2 is larger than that containing nano-SiO2 at the same proportion. Nano-particles content, soap content and temperature, each factor influence is notable. The relation of primary and secondary is soap content, temperature, nano-particles content. The greases with and without the nano-particles both have yield stresses and clear shear-thinning properties. The shear- thinning phenomenon of the grease containing nano-particles is more evident than that of the basic grease. The experimental results also reveal that the theological characteristics of both types of greases fall in Herschel-Bulkley class, and the nano- particles have a significant influence on the rheological parameters. The rheology mechanism was discussed based on the entanglement and orientation theories.
出处
《润滑与密封》
CAS
CSCD
北大核心
2010年第11期9-13,共5页
Lubrication Engineering
基金
863资助项目(2006AA04Z231)
宇航空间机构及控制技术国防重点学科实验室开放基金资助项目(HIT.KLOF.2009056)
关键词
流变性
表观黏度
纳米微粒
锂基脂
rheology
apparent viscosity
nanometer particles
lithium grease
