Jinwei Liu

Sichuan University | SCU

Ti-6Al-4V (TC4) alloy with ultra-smooth surfaces has found extensive application in biomedical fields. Chemical mechanical polishing is a crucial method for achieving ultra-smooth surfaces, but its efficiency in polishing TC4 alloy surfaces is low. This study proposes a new approach to enhance the polishing efficiency by tuning counterions, which s...

Atmospheric plasma etching (APE) has been used to texture Si surfaces due to anisotropic material removal capability. Controlling features and size of the light-trapping structure are keys to improving the reflection performance of silicon (Si) solar cells, which need to fully understand the interfacial etching behavior and the microscopic topograp...

Carbon paper is commonly used for catalytic electrode preparation because of its high conductivity, corrosion resistance, and stability. However, traditional electrode preparation methods are inappropriate for highly hydrophobic carbon paper. In this paper, a high‐activity carbon paper catalytic electrode was prepared using multistrategies cold pla...

Excellent surface quality can improve the noise-free and long-life performance of bearings. Chemical mechanical polishing (CMP) has been used to obtain smooth surfaces. However, some chemical additives in CMP slurries are not so eco-friendly. Therefore, in this study, eco-friendly chemical additives N,N′-1,2-ethanediylbis-1-aspartic acid (EDDS) and...

Smooth surfaces are conducive to improving the lubrication of gears in mechanical systems. In this study, chemical mechanical polishing (CMP) was used to process 18CrNiMo7-6 case hardening steel, a typical material for gears. The results reveal that compared with formic acid and oxalic acid, citric acid can be used as a suitable complexing agent wi...

Oxidation is critical to metal chemical mechanical polishing (CMP). In this work, the role of oxidation in the material removal of GCr15 bearing steel during CMP was thoroughly investigated. Six representative oxidizers were selected to acquire the material removal rate (MRR) data. There are three distinct MRR trends. The oxidizers can be divided i...

Excellent surface quality is strongly needed for improving the service performance of bearings under severe lubrication conditions. In this study, chemical mechanical polishing (CMP) was used to process GCr15 bearing steel. Oxalic acid and H2O2 were used as critical additives in the CMP slurries. In the presence of oxalic acid and with the increasi...

An ultra-smooth surface is required for mechanical components to improve the lubrication performance. In this study, the combination of 5-methyl-1H-benzotriazole (5-methyl-BTA) and thiazole (TA) was used as an effective composite corrosion inhibitor for chemical mechanical polishing of GCr15 bearing steel. The results reveal that, compared with the...

Bearing steels have been used in mechanical components, and an ultra-smooth surface is required in high-precision occasions. In this study, chemical mechanical polishing (CMP) was used to process GCr15 bearing steel. Dicarboxylic acids were used as complexing agents to enhance the CMP efficiency. In synergy with H2O2, carboxyl groups of the dicarbo...

Mechanochemical reactions at the gallium nitride-alumina (GaN–Al2O3) interface at nanoscale offer a significant beneficial reference for the high-efficiency and low-destruction ultra-precision machining on GaN surface. Here, the mechanochemical reactions on oxide-free and oxidized GaN surfaces rubbed by the Al2O3 nanoasperity as a function of the a...

Potassium persulfate was used as an effective oxidizer for chemical mechanical polishing (CMP) of GCr15 steel. The effects of pH, potassium persulfate content and chelating agents on the CMP performance of GCr15 steel were investigated, and the surface films formed in the potassium persulfate-based slurries were characterized accordingly. It is rev...

Ethylenediamine with two −NH 2 functional groups was used as a critical complexing agent in chemical mechanical polishing (CMP) slurries for a high carbon chromium GCr15 bearing steel (equivalent to AISI 52100). The polishing performance and corresponding mechanism of −NH 2 functional groups were thoroughly investigated as a function of pH. It is r...

5-methyl-1H-benzotriazole was used as an effective corrosion inhibitor in acidic H2O2-based slurries for ultra-precision chemical mechanical polishing (CMP) of a high carbon chromium GCr15 bearing steel (AISI 52100). The CMP performance of GCr15 steel and the corresponding corrosion inhibition mechanism of 5-methyl-BTA were thoroughly investigated....

In this paper, chemical mechanical polishing technique was used to prepare an ultra-smooth surface of AISI 52100 steel. It was found that an unexpectedly high MRR of 500 nm/min and a satisfactory surface roughness Ra of 4.0 nm are achieved simultaneously by the synergistic effect of TiSol-NH4 dispersion and H2O2 at near neutral pH 6.0. During the p...

In this work, a high-precision atomic force microscope (AFM) probes rotary exchange module was developed. The module is capable of installing up to eight AFM probes simultaneously. It can achieve in situ rotary exchange of different AFM probes inside the AFM chamber with as high as 3 μrad rotation precision by program control. As a result, differen...

In this paper, the effect of environmental humidity on the mechanical removal of potassium dihydrogen phosphate (KDP) crystal was preliminarily investigated using an environment control atomic force microscope at the nanoscale. The results reveal that the pre-wear storage time in humid environments has nearly no impact on the removal of KDP crystal...

In this work, a reliable atomic force microscope (AFM) probes in situ linear exchange module based on a scanned-sample environment control AFM was developed. The reliability and functionality of the module were experimentally verified through surface topography scanning tests and wear tests under different conditions. The module is able to install...

The purpose of the present work is to probe the friction mechanism of hydrogenated diamond-like carbon (H-DLC) film in air by varying sliding velocity (25–1000 mm/s). Friction tests of Al2O3 ball against H-DLC film were conducted with a rotational ball-on-disk tribometer. As the sliding velocity increases, both the friction coefficient and the surf...

In this paper, the properties of an oxide film formed on a pure iron surface after being polished with an H2O2-based acidic slurry were investigated using an atomic force microscope (AFM), Auger electron spectroscopy (AES), and angle-resolved X-ray photoelectron spectroscopy (AR-XPS) to partly reveal the material removal mechanism of pure iron duri...