Preparation of robust superamphiphobic surface has been still one of research focuses in the surface engineering field. In this study, the SiC/Al composite, an advanced material preferentially used in the industries of microelectronics, aerospace and defense, etc., was innovatively selected as the substrate material to prepare the surfaces with extreme anti-wettability. Electrochemical etching was applied to process the SiC/Al composites and the effects of process parameters on the surface wettability were discussed. The characteristics of resistance to thermal shock of the processed surface with extreme anti-wettability were specially evaluated. It was found that, after processed by electrochemical etching and subsequent boiling water treatment, the modified SiC/Al composites showed an excellent superamphiphobicity to water and some low surface energy liquids including olive oil, soybean oil and hexadecane, with a water contact angle of up to 161.2 • and a water sliding angle of down to 2 • . In addition, the thermal shock experiments showed that the achieved superhydrophobic and superamphiphobic surfaces of the SiC/Al composites both had a significantly great resistance to thermal shocks and high temperature, due mainly to the matrix microstructures of the SiC/Al composites with outstanding mechanical and thermal properties together with the possible good thermal matching property between the low surface energy coating and the SiC particles. The superamphiphobic surfaces with robustly mechanical and outstanding resistance to thermal-shock properties can be facilely prepared by electrochemical etching process based on the SiC/Al composites.
The paper analyzed the thermal problem of the 2D FGM beam using meshless weighted least-square (MWLS) method. The MWLS as a meshless method is fully independent of mesh, and an approximate function was used to construct a series of linear equations to solve the unknown field variable, which avoided the troublesome task of numerical integration. The effectiveness and accuracy of the approach were illustrated by a clamped-clamped FGM beam which was subjected with interior heat source. The volume fraction of FGM beam was assumed to be given by a simple power law distribution. The effective material properties of the FGM beam were assumed to be temperature independent and calculated by Mori-Tanaka method. The results showed that a good agreement was achieved between the proposed meshless method and commercial COMSOL Multiphysics.
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