Bionic superhydrophobic coating has extremely broad application prospects and practical value. It is based on two important conditions, one is the construction of micro–nano structure, the other is the material with ...Bionic superhydrophobic coating has extremely broad application prospects and practical value. It is based on two important conditions, one is the construction of micro–nano structure, the other is the material with low surface energy. How to stabilize the micro–nano structure has become the focus of researches. In this work, a layer of Zn film is deposited on the stainless steel mesh with sturdy micron structure by RF magnetron sputtering. The solid micron structure of the stainless steel mesh itself, combined with the method of thermal oxidation, the surface of the stainless steel mesh is thus formed into a nanorod like ZnO nano structure, and then modified with perfluorodecyltriethoxysilane (PFDS) for low surface energy. The maximum contact angle of the superhydrophobic sample is 154.8°, and the minimum sliding angle is 2°, and it also has excellent corrosion resistance, thermal stability, self-cleaning, anti-aging and anti-icing properties, which provides a design idea for the preparation of superhydrophobic coatings.展开更多
Selective laser melting(SLM)provides optimized lightweight structures for aircraft and space applications.However,the strength of the current SLMed aluminum alloys is still lower than that of the traditional high-perf...Selective laser melting(SLM)provides optimized lightweight structures for aircraft and space applications.However,the strength of the current SLMed aluminum alloys is still lower than that of the traditional high-performance aluminum alloys.This study presents an ultra-high-strength Al-Mn-Mg-Sc-Zr aluminum alloy specifically designed for SLM by increasing the(Mg+Mn)and(Sc+Zr)content simultaneously based on the rapid solidification characteristics of the SLM process.The alloy exhibits good SLM processability with a minimum porosity of 0.23%.After aging at 300℃,the strength of the alloy was effectively improved,and the anisotropy of mechanical properties was reduced.Additionally,the tensile yield strength and ultimate tensile strength of the alloy reached 621±41 MPa and 712±28 MPa,respectively;these values are superior to those of most SLMed aluminum alloys reported previously.Multiple strengthening mechanisms including solid solution strengthening,precipitation strengthening and grain refinement strengthening contribute to the high strength of the present alloys.展开更多
基金supported by the National Natural Science Foundation of China(Grant Number 52172090 and 52071159).
文摘Bionic superhydrophobic coating has extremely broad application prospects and practical value. It is based on two important conditions, one is the construction of micro–nano structure, the other is the material with low surface energy. How to stabilize the micro–nano structure has become the focus of researches. In this work, a layer of Zn film is deposited on the stainless steel mesh with sturdy micron structure by RF magnetron sputtering. The solid micron structure of the stainless steel mesh itself, combined with the method of thermal oxidation, the surface of the stainless steel mesh is thus formed into a nanorod like ZnO nano structure, and then modified with perfluorodecyltriethoxysilane (PFDS) for low surface energy. The maximum contact angle of the superhydrophobic sample is 154.8°, and the minimum sliding angle is 2°, and it also has excellent corrosion resistance, thermal stability, self-cleaning, anti-aging and anti-icing properties, which provides a design idea for the preparation of superhydrophobic coatings.
基金the National Key R&D Program of China(No.2016YFB1100103)the Natural Science Foundation of China(Nos.51801079 and 52001140)+1 种基金the Natural Science Foundation for Young Scientists of Jiangsu,China(Nos.BK20180985,BK20180987)the Open Foundation of Zhenjiang Key Laboratory for High Technology Research on Marine Functional Films(No.ZHZ2019001)。
文摘Selective laser melting(SLM)provides optimized lightweight structures for aircraft and space applications.However,the strength of the current SLMed aluminum alloys is still lower than that of the traditional high-performance aluminum alloys.This study presents an ultra-high-strength Al-Mn-Mg-Sc-Zr aluminum alloy specifically designed for SLM by increasing the(Mg+Mn)and(Sc+Zr)content simultaneously based on the rapid solidification characteristics of the SLM process.The alloy exhibits good SLM processability with a minimum porosity of 0.23%.After aging at 300℃,the strength of the alloy was effectively improved,and the anisotropy of mechanical properties was reduced.Additionally,the tensile yield strength and ultimate tensile strength of the alloy reached 621±41 MPa and 712±28 MPa,respectively;these values are superior to those of most SLMed aluminum alloys reported previously.Multiple strengthening mechanisms including solid solution strengthening,precipitation strengthening and grain refinement strengthening contribute to the high strength of the present alloys.
