The Effects of Content of Zr(NO3)4 on Formation and Characteristics of Micro-arc Oxidation Coatings Formed on ZAlSi12Cu2Mg1 Surface
The aims of this work are to prepare micro-arc oxidation coatings on the surface of ZAlSi12Cu2Mg1 aluminum alloy in Na2SiO3+NaOH+Na2EDTA electrolytes with and without Zr(NO3)4 and study their formation and characteristics. The phase constituent, surface microscopic morphology and cross-sectional morphology of the ceramic coatings were analyzed by XRD(X-ray diffraction), SEM(scanning electron microscope) and optical microscope. The thickness of the ceramic layer were measured by eddy current thickness gauge. The results show that the micro-arc oxidation films are mainly composed of mullite, α-Al2O3 and γ-Al2O3, it provides excellent adhesion with the substrate. With the content of Zr(NO3)4 in electrolyte varies from 0g/L to 1.0g/L, the thickness of the ceramic coating increases sharply at first, but afterwards reduces slowly, and the maximum of thickness up to 202μm when content of Zr(NO3)4 is 0.5g/L. The addition of Zr(NO3)4 into the base electrolyte solution is helpful in coatings formation and the coating formed in the solution containing 0.5g/L Zr(NO3)4 exhibits the best comprehensive features.
Preparation and structure of microarc oxidation ceramic coatings containing ZrO2 grown on LY12 Al alloy
Abstract Ceramic coatings containing ZrO 2 were prepared in situ on LY12 aluminum alloy by microarc oxidation (MAO) in the mixed solution of zirconate and phosphate solution. The phase composition and morphology of the coatings were studied by XRD and SEM, respectively. The growing mechanism of ceramic coatings was discussed in a preliminary manner. The results show that with an increase in MAO time, the compactness of the coating improved and the thickness increased. From the inner layer to the coating surface, the content of Zr increased, while the content of Al decreased. In addition, the coating was composed of m-ZrO 2 , t-ZrO 2 , and a little amount of γ-Al 2 O 3 . With an increase in reaction time, the relative content of t-ZrO 2 within the coating sharply decreased while the relative content of m-ZrO 2 sharply increased, and then both generally kept at a constant level after 60 min.
Study on workspace analysis and simulation of 6-DOF painting robot based on monte-carlo method
Comparing recent kinds of methods working on robot workspace when we design to calculate the workspace of 6R painting robot,we bring Monte-Carlo method to analysis the workspace according to the actual working condition. With robot Tool Center Point(TCP) position aggregate via the solution of forward kinetic equation,Monte-Carlo method analysis and simulate painting robot workspace efficiently.