图4 Al 2 O 3 不锈钢膜M-1100a, b、M-1150c, d、M-1200e, f和M-1250g, h的表面SEM照片a, c, e, g与断面金相显微形貌b, d, f, h Fig. 4 Surface SEM images a, c, e, g and cross-sectional metallographic micrographs b, d, f, h of M-1100 a, b, M-1150 c, d M-1200 e, f and M-1250 g, h Al 2 O 3 stainless steel membranes |