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bionic coupling of Hardness Gradient to Surface Texture for Improved Anti-wear Properties

Journal of bionic Engineering 2016年第3期13卷 406-415页

作者： Long Zheng Jianjun Wu Si Zhang Shishuai Sun Zhihui Zhang Song Liang Zhenning Liu Luquan Ren Key Laboratory of bionic Engineering (Ministry of Education) College of Biological and Agricultural Engineering Jilin University Changchun 130022 China

This work investigates the potential of combining hardness gradient with surface texture （an example of bionic coupling） to improve anti-wear properties. The bionic coupling of hardness gradient and Hexagonal Texture （HT） was achieved by laser heat treatment on steel specimens with pre-engraved hexagonal surface texture. The successful establishment of decreasing hardness from surface to internal bulk was verified by hardness measurements along the depth of cross-sectioned specimens and corre- lated with the observations from metallurgical microscopy. The tribological performance of bionic coupling specimens （HT-L） was examined under dry contact condition, together with respective control specimens of individual bionic features, e.g. HT-H （of similar surface hardness generated by conventional heat treatment but without hardness gradient） and SS-L （of smooth surface treated by the same laser processing as for HT-L）. It is found that HT-L not only exhibits lower friction coefficient and less friction fluctuation than HT-H and SS-L, but also demonstrates a 〉50% reduction of wear loss compared to HT-H and SS-L （0.0343 g for HT-L vs. 0.0723 g for HT-H, P〈0.001; 0.0343 g for HT-L vs. 0.0817 g for SS-L, P〈0.001）. Corroboratively, observations with scanning electron microscopy revealed a relatively smooth surface for worn HT-L specimen, contrasting with the rugged and grooved surfaces of worn HT-H and SS-L specimens. These results indicate that the bionic coupling of hardness gradient to hexagonal texture can indeed improve anti-wear properties, affording a new strategy to wear and friction manage- ment.

关键词： anti-wear bionic coupling hardness gradient surface texture hexagonal texture

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Resistance reduction by bionic coupling of the earthworm lubrication function

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Science China(Technological Sciences) 2010年第11期53卷 2989-2995页

作者： LI JianQiao KOU BingXue LIU GuoMin FAN WenFeng LIU LinLin Key Laboratory of bionic Engineering(Jilin University) Ministry of Education of ChinaChangchun 130022China

Based on the biological coupling theory, the resistance reduction characteristic of the surface morphology and surface wettability of the earthworm were studied in this paper. The parameters of surface dorsal pore and corrugation were extracted. According to these parameters, the lubrication mechanism of the earthworm surface was analyzed. The distribution of the pores and surface morphology were designed and the bionic coupling samples were prepared. The positive pressure, lubricant flow rate and advancing velocity were selected as the experiment factors while the soil friction resistance as observed object. According to the obtained data of bionic coupling samples from the testing system of biologic signal for tiny soil adhesion test, the optimal samples from the bionic coupling resistance reduction tests were selected through the range analysis. Compared to the normal ones, the soil resistance of bionic coupling samples was reduced by 76.8%. This is of great significance and offers bright prospects for reducing energy loss in terrain mechanics.

关键词： bionic coupling earthworm biological surface structure soil resistance reduction

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Study on Camshaft Treated by bionic Laser Melting Process in Aqueous Media Cooling

Study on Camshaft Treated by Bionic Laser Melting Process in...

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The 3rd International Conference of bionic Engineering(ICBE’10)

作者： Yu Zhao 1 2 Dongxue Song 1 Luquan Ren 2 Li Chen 1 2 1 Key Laboratory of Advanced Structrural Materials Ministry of Education Changchun University of Techology Changchun 130012 China 2 Key Laboratory of bionic Engineering (Jilin University) Ministry of Education P.R.China

Biomimetic coupling wear resistance model was created according to biomimetic coupling phenomenon and biomimetic coupling theory. The model utilize the preparation of aqueous media by laser cooling techniques and process biological coupling unit on the gray cast iron surface according to the organism form. The bionic coupled unit is made in accordance with the laws of organism combination and a bionic coupling surface which is similar to the organism form is produced with material surface which can improve the wear resistance of the camshaft. Studies show that the region treated with aqueous media by laser can get small grains with uniform size. The hardness and wear resistance is improved.

关键词： bionic coupling Laser melting Camshaft

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