Herein,a sub-micron lanthanum zirconate ceramic(La_(2)Zr_(2)O_(7),LZO)with a pyrochlore structure was prepared by the sol-gel and high temperature sintering methods.The corrosion behavior and mechanism of calcium-ferr...Herein,a sub-micron lanthanum zirconate ceramic(La_(2)Zr_(2)O_(7),LZO)with a pyrochlore structure was prepared by the sol-gel and high temperature sintering methods.The corrosion behavior and mechanism of calcium-ferrum-alumina-silicate(CFAS)powder(33CaO:10FeO_(1.5):13AlO_(1.5):44SiO_(2))on the sub-micron LZO ceramic at 1673 K was investigated.The results indicate that the average grain size of sub-micron LZO ceramic was 895 nm.The CFAS melt rapidly diffused into the interior of the LZO ceramic wafer and reacted with it to generate high melting point rod-shaped Ca_(2)La_(8)(SiO_(4))_(6)O_(2)apatite and m-ZrO_(2)phases,which can effectively hinder further diffusion of CFAS melt,resulting in a slow increase in corrosion depth with corrosion time.After 30 h of CFAS corrosion at 1673 K,the corrosion depth of the LZO ceramic wafer was only 160.3µm,demonstrating its excellent high-temperature resistance to CFAS corrosion.展开更多
基金Projects(12305304,52473340)supported by the National Natural Science Foundation of ChinaProject(2022Z0560M4001)supported by the Aeronautical Science Foundation of Chinese Aeronautical Establishment+2 种基金Project(2024YCII01141)supported by the Yuelushan Center Industrial Innovation,ChinaProject(2025JJ20042)supported by the Natural Science Foundation of Hunan Province,ChinaProject(2024-2025 Sklpm-ZZ-041)supported by the State Key Laboratory of Powder Metallurgy,China。
文摘Herein,a sub-micron lanthanum zirconate ceramic(La_(2)Zr_(2)O_(7),LZO)with a pyrochlore structure was prepared by the sol-gel and high temperature sintering methods.The corrosion behavior and mechanism of calcium-ferrum-alumina-silicate(CFAS)powder(33CaO:10FeO_(1.5):13AlO_(1.5):44SiO_(2))on the sub-micron LZO ceramic at 1673 K was investigated.The results indicate that the average grain size of sub-micron LZO ceramic was 895 nm.The CFAS melt rapidly diffused into the interior of the LZO ceramic wafer and reacted with it to generate high melting point rod-shaped Ca_(2)La_(8)(SiO_(4))_(6)O_(2)apatite and m-ZrO_(2)phases,which can effectively hinder further diffusion of CFAS melt,resulting in a slow increase in corrosion depth with corrosion time.After 30 h of CFAS corrosion at 1673 K,the corrosion depth of the LZO ceramic wafer was only 160.3µm,demonstrating its excellent high-temperature resistance to CFAS corrosion.
