天然石墨电极的成型性能与抗氧化研究-材料物理与化学专业论文.docx

mg／g／h,分别采用硼酸-尿素体系和硅酸乙酯-乙醇一盐酸体系9次浸渍，在1273K，N2气 氛下热处理l小时后，天然鳞片石墨氧化失重率在923K分别为47．9 mg／g／h和 206．1mg／g／h：分别在1973K和1723K N2气氛下热处理1小时后，天然鳞片石墨氧化失 重率在923K分别为3．0 mg／g／h和42．0rag／g／h,2种体系都能降低天然鳞片石墨的氧化失 重率，但硼酸．尿素体系的抗氧化效果优于硅酸乙酯．乙醇．盐酸体系。研究了溶液法和溶胶法制备硼氮体系和硅溶胶包覆天然鳞片石墨块体前后的抗氧化 性。结果表明，硅溶胶包覆天然石墨块体随着浸渍次数的增多，抗氧性越差；硼氮体系 包覆天然石墨块体随着浸渍次数的增多，抗氧性越好；天然石墨块体在923K和1273K 时的氧化失重率分别为122．432mg／g／h和191．214rag／g／h；分别采用硼酸-尿素体系和硅酸 乙酯．乙醇．盐酸体系9次浸渍，在1273K，N2气氛下热处理1小时后，天然石墨块体的 氧化失重率在923K分别为20．477mg／g／h和28．753rag／g／h；在1273K分别为37．064mg／g／h和54．398mg／g／h；分别在1 973K和1 723K处理后，天然石墨块体氧化失重率在923K分 别为8．182 mg／g／h和31．347mg／g／h；在1273K分别为126．729mg／g／h和169．978mg／g／h；2 种体系都能大大降低天然石墨块体的氧化失重率，同样，硼酸．尿素体系的抗氧化效果优 于硅酸乙酯．乙醇．盐酸体系。关键词：天然鳞片石墨浸渍结构抗氧化IIlhe Research 013 Proeessab i I i ty and Ant i—OX i dat i 013 ot：Natura IGraph i te E I eel：rode AbstractThe major uses of舯；phite electrode were electric steelmaking、orefumace phosphorusmaking，fused magnesite，fused refiactory，electrolytic aluminium and industrial manufacturephosphorus、silicon、carbide etc．．Graphite electrode was classified into natmal graphite electrode and artificial graphite electrode．Natural graphite electrode did not need graphitizing,SO the production period was greatly decreased,energy consume and pollution were also greatlydecreased,cost was obviously reduced,price dominance and economic performance is invisible． This WaS one of the prime reasorls to develop natural graphite electrode．Additionally,natural graphite electrode was natural graphite aeep treatment production with a hi．gh added value． Natural graphite electrode had great development and application values,but its mold performance,anti-oxidation and mechanical properties were worse than artificial graphite electrode．This was the main barrier to develop it．Therefore，to overcome these balTiers was thekey to develop natural graphite electrode．The samples were prepared by natural flakes graphite powder without binding by cold pressing．The effect ofdensity、pore degree and bending strength of samples were st