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Volume 9 No. 1
05 February 2021

Lei CHEN, Linmao QIAN

2021, 9(1): 1-28.   doi:10.1007/s40544-020-0425-4
Abstract ( 32 HTML ( 4   PDF(1638KB) ( 55 )   Save

Surficial water adsorption and interfacial water condensation as natural phenomena that can alter the contact status of the solid interface and tribological performances are crucial in all length scales, i.e., from earthquakes to skating at the macroscale level and even to micro/nano-electromechanical systems (M/NEMS) at the microscale/nanoscale level. Interfacial water exhibits diverse structure and properties from bulk water because of its further interaction with solid surfaces. In this pa...

Lin ZHANG, Guoxin XIE, Shuai WU, Shiguang PENG, Xiaoqing ZHANG, Dan GUO, Shizhu WEN, Jianbin LUO

2021, 9(1): 29-40.   doi:10.1007/s40544-019-0312-4
Abstract ( 33 HTML ( 4   PDF(1122KB) ( 31 )   Save

Ultralow friction polymer composites were prepared by adding oil-loaded microcapsules into epoxy (EP) resin. Mono-dispersed polystyrene (PS)/poly alpha olefin (PAO) microcapsules with a diameter of ~2 μm and a shell thickness of ~30 nm were prepared by solvent evaporation method in an oil-in-water emulsion. The lubrication behaviors of the EP resin composites with oil-loaded microcapsules have been investigated under different loads and sliding speeds. As compared with the pure EP resi...

Deepak K. PRAJAPATI, Mayank TIWARI

2021, 9(1): 41-60.   doi:10.1007/s40544-019-0323-1
Abstract ( 12 HTML ( 7   PDF(2009KB) ( 20 )   Save

Dry wear experiments provide an insight detail on how severely contacting surfaces change under unlubricated sliding condition. The theory of dry sliding wear is used for understanding mixed-lubrication regime in which asperity interactions play a significant role in controlling of the friction coefficient (f). The purpose of this work is to study the tribological behavior of AISI 304 steel in contact with AISI 52100 steel during wear. Both materials are used in rolling element bearing...

Jiajia JIA, Guangbin YANG, Chunli ZHANG, Shengmao ZHANG, Yujuan ZHANG, Pingyu ZHANG

2021, 9(1): 61-74.   doi:10.1007/s40544-019-0324-0
Abstract ( 19 HTML ( 1   PDF(1659KB) ( 11 )   Save

A magnetic ionic liquid (abridged as MIL) [C6mim]5[Dy(SCN)8] was prepared and used as the magnetic lubricant of a steel-steel sliding pair. The tribological properties of the as-prepared MIL were evaluated with a commercially obtained magnetic fluid lubricant (abridged as MF; the mixture of dioctyl sebacate and Fe3O4, denoted as DIOS-Fe3O4) as a control. The lubrication mechanisms of the two types of magnetic lubrica...

Guanlin REN, Pengfei ZHANG, Xiangyuan YE, Wen LI, Xiaoqiang FAN, Minhao ZHU

2021, 9(1): 75-91.   doi:10.1007/s40544-019-0325-z
Abstract ( 17 HTML ( 1   PDF(2068KB) ( 8 )   Save

In this study, lithium complex grease (LCG) and polyurea grease (PUG) were synthesized using mineral oil (500SN) and polyalphaolefin (PAO40) as base oil, adsorbed onto lithium complex soap and polyurea as thickeners, respectively. The effects of grease formulation (thickener and base oil with different amounts (80, 85, and 90 wt%) on the corrosion resistance and lubrication function were investigated in detail. The results have verified that the as-prepared greases have good anti-corrosion ab...

Yewei FU, Le ZHOU, Tao YIN, Zhongyao LUO, Hejin LI, Lehua QI

2021, 9(1): 92-103.   doi:10.1007/s40544-019-0326-y
Abstract ( 12 HTML ( 0   PDF(1300KB) ( 6 )   Save

As an alternative to short fibers, non-woven fabrics (NWFs) were made using different types of long fibers to optimize the performance of paper-based friction materials and their technology. In this investigation, the fillers and resin were impregnated into these NWFs to prepare three kinds of wet friction material. The tribological, mechanical, and thermal properties of the new wet friction material were studied. The results indicate that the dynamic friction coefficient of the new friction ...

Zhiping HUANG, Wenjie ZHAO, Wenchao ZHAO, Xiaojing CI, Wentao LI

2021, 9(1): 104-118.   doi:10.1007/s40544-019-0329-8
Abstract ( 11 HTML ( 0   PDF(1377KB) ( 20 )   Save

A series of high solid content (30 wt%) epoxy resin (EP) composite coatings reinforced with differently sized cubic boron nitride (CBN) particles were fabricated successfully on 304L stainless steel. Polydopamine (PDA) was used to improve the dispersibility of CBN particles in EP. The structural and morphological features of the CBN particles and the composite coatings were characterized by Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Mor...

Zhinan ZHANG, Shuaihang PAN, Nian YIN, Bin SHEN, Jie SONG

2021, 9(1): 119-131.   doi:10.1007/s40544-019-0341-z
Abstract ( 13 HTML ( 1   PDF(1237KB) ( 20 )   Save

Friction behavior at fretting interfaces is of fundamental interest in tribology and is important in material applications. However, friction has contact intervals, which can accurately determine the friction characteristics of a material; however, this has not been thoroughly investigated. Moreover, the fretting process with regard to different interfacial configurations have also not been systematically evaluated. To bridge these research gaps, molecular dynamics (MD) simulations on Al-Al, ...

M. FESHANJERDI

2021, 9(1): 132-142.   doi:10.1007/s40544-019-0353-8
Abstract ( 3 HTML ( 0   PDF(726KB) ( 3 )   Save

In this study, the effects of finger roughness on the electrostatic potential, electrostatic field, and average effective squeezing pressure between a human finger and a touchscreen are calculated by the perturbation method. This theory is an extension of an earlier work by Persson. It is found that an additional potential <ϕ

Pu WU, Xinchun CHEN, Chenhui ZHANG, Jiping ZHANG, Jianbin LUO, Jiyang ZHANG

2021, 9(1): 143-154.   doi:10.1007/s40544-019-0359-2
Abstract ( 10 HTML ( 1   PDF(1411KB) ( 10 )   Save

Graphene is a promising material as a lubricant additive for reducing friction and wear. Here, a dispersing method which combines chemical modification of graphene by octadecylamine and dicyclohexylcarbodiimide with a kind of effective dispersant has been successfully developed to achieve the remarkable dispersion stability of graphene in base oil. The stable dispersion time of modified graphene (0.5 wt%) with dispersant (1 wt%) in PAO-6 could be up to about 120 days, which was the longest ti...

Justine DECROZANT-TRIQUENAUX, Leonardo PELCASTRE, Braham PRAKASH, Jens HARDELL

2021, 9(1): 155-168.   doi:10.1007/s40544-020-0371-6
Abstract ( 6 HTML ( 0   PDF(1545KB) ( 15 )   Save

The use of high strength aluminium alloys, such as 6XXX and 7XXX series, is continuously increasing for automotive applications in view of their good strength-to-weight ratio. Their formability at room temperature is limited and they are thus often formed at high temperatures to enable production of complex geometries. Critical challenges during hot forming of aluminium are the occurrence of severe adhesion and material transfer onto the forming tools. This negatively affects the tool life an...

Hong GUO, Patricia IGLESIAS

2021, 9(1): 169-178.   doi:10.1007/s40544-020-0378-z
Abstract ( 6 HTML ( 0   PDF(1261KB) ( 6 )   Save

In this study, the tribological behavior of an ammonium-based protic ionic liquid (PIL) as an additive in a base mineral oil (MO) is investigated on a steel-steel contact at room temperature and 100 °C. Tri-[bis(2-hydroxyethylammonium)] citrate (DCi) was synthesized in a simple and low-cost way, and the ionic structure of DCi was confirmed by proton nuclear magnetic resonance (1H NMR). The stability measurement of 1 wt% DCi to a MO was investigated, and the lubricating ability and ...

Xinming LI, Feng GUO, Gerhard POLL, Yang FEI, Ping YANG

2021, 9(1): 179-190.   doi:10.1007/s40544-020-0381-4
Abstract ( 4 HTML ( 2   PDF(1407KB) ( 6 )   Save

Although most rolling element bearings are grease lubricated, the underlying mechanisms of grease lubrication has not been fully explored. This study investigates grease film evolution with glass disc revolutions in rolling elastohydrodynamic lubrication (EHL) contacts. The evolution patterns of the grease films were highly related to the speed ranges and grease structures. The transference of thickener lumps, film thickness decay induced by starvation, and residual layer were recognized. The...

Gabriele RIVA, Francesco VARRIALE, Jens WAHLSTRÖM

2021, 9(1): 191-200.   doi:10.1007/s40544-020-0397-9
Abstract ( 9 HTML ( 0   PDF(843KB) ( 12 )   Save

The coefficient of friction (COF) is one of the most important parameters to evaluate the performance of a brake system. To design proper brake systems, it is important to know the COF when estimating the brake force and resulting torque. It is challenging to simulate the COF since friction in disc brakes is a complex phenomenon that depends on several parameters such as sliding velocity, contact pressure, materials, and temperatures, etc. There is a lack of studies found in the literature fo...

Zhuxin TIAN, Yu HUANG

2021, 9(1): 201-206.   doi:10.1007/s40544-019-0328-9
Abstract ( 7 HTML ( 0   PDF(563KB) ( 6 )   Save

The stiffness and dampness parameters of journal bearings are required in rectangular coordinates for analyzing the stability boundary and threshold speed of oil film bearings. On solving the Reynolds equation, the oil film force is always obtained in polar coordinates; thus, the stiffness and dampness parameters can be easily obtained in polar coordinates. Therefore, the transformation between the polar and rectangular coordinates of journal bearing stiffness and dampness parameters is discu...