期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
SiO_2填充聚四氟乙烯复合材料的摩擦学行为研究 被引量:22
1
作者 王晓波 冯治中 阎逢元 《润滑与密封》 CAS CSCD 北大核心 2002年第1期48-49,47,共3页
用机械共混和冷压成型、热烧结的方法制备了不同体积含量不同粒径的SiO2填充PTFE样品。用M-2000摩擦磨损试验机评价了不同样品在干摩擦下的摩擦学性能;用X射线能量损失谱(EDS)观察分析了摩擦前后Si元素在样品表面的分布情况。结果表明... 用机械共混和冷压成型、热烧结的方法制备了不同体积含量不同粒径的SiO2填充PTFE样品。用M-2000摩擦磨损试验机评价了不同样品在干摩擦下的摩擦学性能;用X射线能量损失谱(EDS)观察分析了摩擦前后Si元素在样品表面的分布情况。结果表明:在本实验所采用的实验条件下,SiO2/FTFE复合材料的摩擦系数随SiO2体积含量的增加而增大,抗磨损能力则有一个最佳含量;填料粒径不同,其体积填充分数对复合材料摩擦磨损性能的作用规律不同:在相同的体积分数下,粗SiO2填充PTFE的摩擦系数小于细SiO2填充PTFE的摩擦系数,且其随SiO2填充分数增加而增大的趋势远小于细SiO2填充PTFE;其具有最好抗磨能力的最佳体积填充含量也大于细SiO2的体积填充含量。SiO2这种填充作用规律可由其在PTFE基体中的形态结构特征来解释。 展开更多
关键词 PTFE 复合材料 摩擦学行为 二氧化验硅 聚四氟乙烯
下载PDF
An experimental comparison of water based alumina and silica nanofluids heat transfer in laminar flow regime 被引量:2
2
作者 Azari Ahmad Kalbasi Mansour Derakhshandeh Masoud 《Journal of Central South University》 SCIE EI CAS 2013年第12期3582-3588,共7页
Experimental investigations were carried out to determine the Al2O3/water and SiO2/water nanofluids flowing through a circular tube. convective heat transfer performance and pressure drop of Measurements show that the... Experimental investigations were carried out to determine the Al2O3/water and SiO2/water nanofluids flowing through a circular tube. convective heat transfer performance and pressure drop of Measurements show that the addition of small amounts of nano-sized Al2O3 particles to the base fluid increases heat transfer coefficients considerably, while the result for the silica nanofluids contradicts with the alumina nanofluids and this leads to some interesting results. In the case of alumina nanofluids, an average increase of 16% in convective heat transfer coefficient is observed with an average penalty of 28% in pressure drop. Moreover, flow resistance increases significantly compared to the base fluid even at very low concentrations of nanofluids. Finally, measured heat transfer coefficients are compared with predicted ones from the correlation of Shah under the same conditions. 展开更多
关键词 CONVECTION forced convection heat transfer nano scale heat transfer
下载PDF
Nanowear pretreatment of AFM tips for reasonable friction force 被引量:1
3
作者 CHAI ZhiMin LIU YuHong +2 位作者 WANG WeiQi LU XinChun HE DanNong 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第11期2241-2248,共8页
In a nanoscale friction test,wear of an atomic force microscope(AFM)tip is inevitable.The shape of the worn tip influences the friction force measured.In order to eliminate the influence,nanowear pretreatment should b... In a nanoscale friction test,wear of an atomic force microscope(AFM)tip is inevitable.The shape of the worn tip influences the friction force measured.In order to eliminate the influence,nanowear pretreatment should be conducted for the AFM tip.In our study,pretreatment of three kinds of tips,i.e.Si3N4 tip,Si tip and silica colloidal tip,was performed using AFM.The results show that the shape of the tips changes with the increase of sliding distance,which leads to the variety of friction force.Whereas,when the tip gets blunt,the shape of tip tends to become stable and the friction force becomes stable correspondingly.To a certain degree,it reveals that the pretreated tips can be applied to study the friction force of samples. 展开更多
关键词 atomic force microscope TIP wear friction force
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部