The effect of the micro-structures on the scorpion surface for improving the anti-erosion performance

• Published in: Surface & coatings technology Vol. 313; pp. 143 - 150
• Main Authors: Han, Zhiwu, Zhu, Bin, Yang, Mingkang, Niu, Shichao, Song, Honglie, Zhang, Junqiu
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15-03-2017; Elsevier BV
• Subjects: Anti-erosion performance; Bionics; Bump; Curvature; Effects; Erosion areas; Erosion mechanisms; Erosion resistance; Impact angle; Microstructure; Particle impact; Scorpion carapace; Stress; Erosion areas; Scorpion carapace; Bump; Anti-erosion performance; Curvature; Impact angle
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2017.01.061

New bionic function surface inspired from desert scorpion was developed for erosion resistance application in this research. Three elements, bump, groove-shape and curvature, were applied on the surface. Using of Stereo Microscope, the micro-structures of the scorpion (Androctonus australis) were analyzed. According to information, bionic samples were manufactured. Solid particle erosion behavior is investigated using a blasting jet machine at particle impact angle (30°) and stress of air compressor is 0.5MPa. The experimental results of bionic samples were compared with traditional smooth sample and each other, respectively. Results of erosion test and Scanning Electron Microscope (SEM) were selected as evaluation standard and explored anti-erosion mechanisms of these micro-structures which were on the bionic surface. The experimental results show that bionic samples have superior solid particle erosion resistance than traditional smooth sample, owing to the micro-structures on the surface. Referring to the analysis, both the bump and curvature can improve the anti-erosion performance by changing the relative impact angle which is compared to the surface of sample.
[Display omitted]
•Bumps and curvature structures were first manufactured by 3D printer and used for bionic samples.•Use the stainless steel as materials to manufacture bionic samples after optimization and it is close to the engineering.•Both bump and curvature could change relative impact angle, and when it became smaller the erosion rare would cut down.