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Research On Wear Resistance And Friction Surface Morphology Of Bionic Non-smooth Coating

Posted on:2014-02-17Degree:MasterType:Thesis
Country:ChinaCandidate:J WangFull Text:PDF
GTID:2231330398950483Subject:Mechanical and electrical engineering
Abstract/Summary:PDF Full Text Request
Wear is the main reason for the failure of most mechanical parts, therefore, it is necessary to study wear-resisting technology. Depositing wear-resistant coating is the most effective measure to avoid wear. Based on the image processing technology, this paper proposed two parameters, such as pits distribution rate and fractal dimension, which were used for characterizing surface morphology of bionic coating. Extraction methods for pits distribution rate and fractal dimension were studied so as to provide a theoretical and technical support for the analysis of surface morphology in the follow-up experiment.Firstly, the impact of granularity of ceramic microsphere, content of ceramic microsphere and curing temperature on the surface morphology of bionic coating was studied. The experimental study found that the size of convex hull and pit structure of bionic coating increased with the granularity of ceramic microsphere. and when the granularity of ceramic microsphere is4#(65μm~76μm), it had a bigger convex hull and pit structure. When the content of ceramic microsphere is15%, ceramic microspheres were arranged closely, and the convex hull and pit structure was regular. The surface quality was better, when coating was cured at a temperature of30℃and40℃, however, when the curing temperature exceeded50℃(including50℃), the surface of coating existed many defects, such as wrinkles, orange peels and bubbles. The granularity of ceramic microsphere and content of ceramic microsphere had an impact on the wear resistance of bionic coating. The experimental study found that when the granularity of ceramic microsphere was2#(25μm~43μm) and when the content of ceramic microsphere was15%, the bionic coating had a better wear resistance. The interaction of hard phase effect, interpenetrating polymer networks effect and bionic effect made the bionic structure coating have a good wear resistance.Secondly, the impact of pits distribution rate on wear resistance of bionic coating was studied. The pits distribution rate gradually decreased with the increase of the number of friction. Under different load conditions, the pits distribution rate had a different influence on wear resistance of coating. When F was9.8N, pits distribution rate was22%, the coating had a lower abrasion loss. When F was14.7N, pits distribution rate was23%, the coating had a better wear resistance. When F was19.6N, pits distribution rate was19%, the coating had a better wear resistance. Lastly, the impact of fractal dimension on wear resistance of bionic coating was studied. Thanractal dimension increased with the increase of the number of friction. Under different load conditions, the fractal dimension had a different influence on wear resistance of coating. When F was9.8N, fractal dimension was2.452, the coating had a better wear resistance. When F was14.7N, fractal dimension was2.474, the coating had a better wear resistance. When F was19.6N, fractal dimension was2.465, the coating had a lower abrasion loss.
Keywords/Search Tags:Bionic Non-smooth Coating, Anti-wear Mechanism, Pits Distribution Rate, Fractal Dimension
PDF Full Text Request
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