Formation of bionic surface textures composed by micro-channels using nanosecond laser on Si3N4-based ceramics

2021 ◽  
Author(s):  
Youqiang Xing ◽  
Cheng Luo ◽  
Yizhi Wan ◽  
Peng Huang ◽  
Ze Wu ◽  
...  
Keyword(s):  
Nanosecond Laser ◽  
Surface Textures ◽  
Micro Channels ◽  
Bionic Surface

An Investigation on Deformation-Based Micro Surface Texturing

2011 ◽  
Author(s):  
Rui Zhou ◽  
Jian Cao ◽  
Kornel Ehmann ◽  
Chun Xu
Keyword(s):  
Sheet Material ◽  
Thin Sheet ◽  
Surface Texturing ◽  
Channel Depth ◽  
Surface Textures ◽  
Numerical Studies ◽  
Micro Channels ◽  
Thin Sheet Material ◽  
Wear Reduction ◽  
Final Profile

Micro surface textures have various applications, such as friction/wear reduction and bacteria sterilization. Deformation-based micro surface texturing has the potential of economically creating micro surface textures over a large surface area. A novel desktop micro surface texturing system is proposed for efficiently and economically fabricating micro channels on the surface of thin sheet material for micro fluid and friction/wear reduction applications. Both experimental and numerical studies were employed to analyze the problems of the flatness of the textured sheet, the uniform of the channel depth and pile-ups built up during the micro surface texturing process. The results demonstrated a clear relationship between relative velocity of the upper and lower rolls and the flatness of the textured sheet and the final profile of the micro channels.

Micro-channels machining on polycrystalline diamond by nanosecond laser

2018 ◽  
Vol 108 ◽  
pp. 333-345 ◽  
Author(s):  
Youqiang Xing ◽  
Lei Liu ◽  
Xiuqing Hao ◽  
Ze Wu ◽  
Peng Huang ◽  
...  
Keyword(s):  
Polycrystalline Diamond ◽  
Nanosecond Laser ◽  
Micro Channels

scholarly journals Effect of vein-bionic surface textures on the tribological behavior of cylindrical roller thrust bearing under starved lubrication

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Risheng Long ◽  
Chao Zhao ◽  
Yimin Zhang ◽  
Yibing Wang ◽  
Yueyong Wang
Keyword(s):  
Tribological Behavior ◽  
Wear Test ◽  
Laser Surface Texturing ◽  
Wear Loss ◽  
Wear Properties ◽  
Surface Textures ◽  
Mass Losses ◽  
Bionic Surface ◽  
Starved Lubrication ◽  
Cylindrical Roller

AbstractTo reveal the effect of vein-bionic surface textures on the tribological behavior of cylindrical roller thrust bearings (CRTBs) under starved lubrication, six kinds of leaves (Forsythia, Clausena lansiu, Ash, Purple leaf plum, Pipal and Apricot) were chose and their simplified patterns were fabricated on the shaft washers of CRTBs using laser surface texturing. The coefficients of friction (COFs) of vein-bionic textured bearings were measured using a vertical universal wear test rig. Their mass losses and worn surfaces were also characterized. The results show that: There is important influence of the symmetry of vein-bionic textures and the number of secondary veins on the friction and wear properties of vein-bionic textured CRTBs under starved lubrication. Compared to the smooth group, the COFs and mass losses of vein-bionic textured bearings are all reduced. Among all groups, the tribological performance of bearings with a pattern inspired from Ash is the best. Its wear loss is reduced by 16.23% and its COF is reduced by 15.79%. This work would provide a valuable reference for the raceway design and optimization of roller rolling element bearings.

Fabrication and characterization of micro-channels on Al2O3/TiC ceramic produced by nanosecond laser

2018 ◽  
Vol 44 (18) ◽  
pp. 23035-23044 ◽  
Author(s):  
Youqiang Xing ◽  
Lei Liu ◽  
Ze Wu ◽  
Xingsheng Wang ◽  
Peng Huang ◽  
...  
Keyword(s):  
Nanosecond Laser ◽  
Micro Channels ◽  
Fabrication And Characterization

Research on the Fabrication of Micro Channels in Fused Silica Substrates by Nanosecond Laser

2012 ◽  
Vol 49 (4) ◽  
pp. 041401
Author(s):  
李世雄 Li Shixiong ◽  
白忠臣 Bai Zhongchen ◽  
秦水介 Qin Shuijie
Keyword(s):  
Fused Silica ◽  
Nanosecond Laser ◽  
Micro Channels ◽  
Silica Substrates

Noise reduction of a tractor exhaust tailpipe with bionic convex textures

2019 ◽  
Vol 67 (5) ◽  
pp. 363-372
Author(s):  
Zhijun Zhang ◽  
Zhenhua Hou ◽  
Xiangjin Xin ◽  
Lijie Liu ◽  
Jiyu Sun
Keyword(s):  
Noise Reduction ◽  
3D Modeling ◽  
Noise Source ◽  
Exhaust System ◽  
Surface Textures ◽  
System Noise ◽  
Acoustic Simulation ◽  
Bionic Surface ◽  
Different Shapes ◽  
Reduction Effect

Exhaust system noise is a major noise source of diesel tractor engines. In this article, this problem is improved by using bionics to alter the noise transmission route. By imitating the unique microstructures of owls, goshawks and sharks, the noise reduction effect was studied by designing bionic surface textures for the inner walls of exhaust tailpipes through bionic modification. Different shapes of textures (rectangle, sine, diamond, triangle, inverted triangle, and a combination of all 5 different shapes) with heights of 1.5 mm were designed for application on the inner walls of the exhaust tailpipes. Under the premise of not changing the structure and arrangement of the entire exhaust tailpipe system, bionic nonsmoothing and basic acoustic theories were used in 3D modeling, mesh discretization and acoustic simulation for each convex texture. The noise reduction effects on different tractor bionic exhaust tailpipes were studied while utilizing identical convex texture heights, and the convex texture with the best noise reduction effect was identified.

Variations in Surface Textures of Quartz Sand using Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 494-495
Author(s):  
Eugene J. Amaral
Keyword(s):  
Electron Microscopy ◽  
Glass Industry ◽  
Glass Slide ◽  
Distilled Water ◽  
Early Paleozoic ◽  
Secondary Effects ◽  
Surface Textures ◽  
High Silica ◽  
Sand Deposit ◽  
The U.S

Examination of sand grain surfaces from early Paleozoic sandstones by electron microscopy reveals a variety of secondary effects caused by rock-forming processes after final deposition of the sand. Detailed studies were conducted on both coarse (≥0.71mm) and fine (=0.25mm) fractions of St. Peter Sandstone, a widespread sand deposit underlying much of the U.S. Central Interior and used in the glass industry because of its remarkably high silica purity.The very friable sandstone was disaggregated and sieved to obtain the two size fractions, and then cleaned by boiling in HCl to remove any iron impurities and rinsed in distilled water. The sand grains were then partially embedded by sprinkling them onto a glass slide coated with a thin tacky layer of latex. Direct platinum shadowed carbon replicas were made of the exposed sand grain surfaces, and were separated by dissolution of the silica in HF acid.

Sign in / Sign up

Export Citation Format

Share Document