规则多孔金属理想结构分析

在氢气或氢气和氩气混合的高压气氛中,采用定向凝固技术制得了规则多孔Cu。对不同直径和不同气孔率的试样进行了图像处理;计算了各可能结构的理论气孔率,并与实测值比较;计算了各结构生成吉布斯能;对比了各结构的演化完整性。结果表明,正六边形气孔率理论计算值与实测值偏差最小;正六边形结构生成吉布斯能最低;正六边形结构无空位和中断,具有完好的演化性。正六边形是规则多孔金属气孔析出的理想结构。

Idea Structural Analysis of Directional Porous Metal

Directional porous copper was fabricated by directional solidification method under a pressurized hydrogen or gas mixture of hydrogen and argon.The samples were processed by an image analyzer to obtain the different pore diameter and inter-pore spacing.The theoretical porosity of all possible structures was calculated and compared with the actual porosity of the samples.The Gibbs free energy of every structure was calculated.Meanwhile,the evolution completeness of every possible structure was analyzed.The results show that calculated porosity of hexagonal pore structure exhibits the smallest deviation from actual porosity,where formed Gibbs energy is the lowest.Hexagon is the ideal structure because the hexagon structure is no vacant site and no interrupt in evolution of porous structure.