结合当地土壤地质条件,基于寿阳220 k V及110 k V变电站的大量数据分析,通过对铜接地网、铜覆钢接地网、镀锌扁钢接地网等常用接地材料进行合理性计算和分析。通过计算结果可知,本工程选用-80mm×10 mm镀锌扁钢为主接地网材料,满足...结合当地土壤地质条件,基于寿阳220 k V及110 k V变电站的大量数据分析,通过对铜接地网、铜覆钢接地网、镀锌扁钢接地网等常用接地材料进行合理性计算和分析。通过计算结果可知,本工程选用-80mm×10 mm镀锌扁钢为主接地网材料,满足腐蚀与热稳定的要求。结合考察在昌吉地区工程中镀锌扁钢均能满足规范要求,工程最终选用镀锌扁钢为主接地网材料。展开更多
An aluminum/copper clad composite was fabricated by the casting-cold extrusion forming technology and the microstructures of the products were observed and analyzed.It is found that aluminum grains at the interface ar...An aluminum/copper clad composite was fabricated by the casting-cold extrusion forming technology and the microstructures of the products were observed and analyzed.It is found that aluminum grains at the interface are refined in the radial profiles of cone-shaped deformation zone,but the grains in the center maintain the original state and the grain size is non-uniform.A clear boundary presents between the refined area and center area.In contrast,the copper grains in the radial profiles have been significantly refined.In the center area of the copper,the grains are bigger than those at the boundary.On the surface of the deformable body,the grain size is the smallest,but with irregular grain morphology.After the product is entirely extruded,all the copper and aluminum grains are refined with small and uniform morphology.In the center area,the average diameter of aluminum grains is smaller than 5 μm,and the copper grain on the surface is about 10 μm.At the interface,the grain size is very small,with a good combination of copper and aluminum.The thickness of interface is in the range of 10-15 μm.Energy spectrum analysis shows that CuAl3 phase presents at the interface.展开更多
文摘结合当地土壤地质条件,基于寿阳220 k V及110 k V变电站的大量数据分析,通过对铜接地网、铜覆钢接地网、镀锌扁钢接地网等常用接地材料进行合理性计算和分析。通过计算结果可知,本工程选用-80mm×10 mm镀锌扁钢为主接地网材料,满足腐蚀与热稳定的要求。结合考察在昌吉地区工程中镀锌扁钢均能满足规范要求,工程最终选用镀锌扁钢为主接地网材料。
基金Project(60806006) supported by the National Natural Science Foundation of China
文摘An aluminum/copper clad composite was fabricated by the casting-cold extrusion forming technology and the microstructures of the products were observed and analyzed.It is found that aluminum grains at the interface are refined in the radial profiles of cone-shaped deformation zone,but the grains in the center maintain the original state and the grain size is non-uniform.A clear boundary presents between the refined area and center area.In contrast,the copper grains in the radial profiles have been significantly refined.In the center area of the copper,the grains are bigger than those at the boundary.On the surface of the deformable body,the grain size is the smallest,but with irregular grain morphology.After the product is entirely extruded,all the copper and aluminum grains are refined with small and uniform morphology.In the center area,the average diameter of aluminum grains is smaller than 5 μm,and the copper grain on the surface is about 10 μm.At the interface,the grain size is very small,with a good combination of copper and aluminum.The thickness of interface is in the range of 10-15 μm.Energy spectrum analysis shows that CuAl3 phase presents at the interface.
