掺铝铬酸镧烧结过程的相变特征  

Phase Transformation of Aluminum-Doped Lanthanum Chromite During Sintering Process

作　　者：李士刚[1] 李胜利[1] 孙良成[1] 李德辉[2] 敖青[1] 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061 [2]包头稀土研究院,内蒙古包头014010

出　　处：《金属热处理》2004年第10期4-7,共4页Heat Treatment of Metals

基　　金：山东省中青年科学家基金 ( 0 2BS0 61) ;国家自然科学基金 ( 5 0 3 62 0 0 1)

摘　　要：用溶胶 凝胶法制备出铬酸镧超细粉体 ,然后掺入铝粉制成试样。用DSC和XRD等手段对掺铝铬酸镧烧结过程的相变进行研究。结果表明 ,掺铝La0 9Ca0 1CrO3烧结时铝首先熔化 ,然后与氧发生反应生成Al2 O3,后者发生晶型转变后再与La0 9Ca0 1CrO3反应生成六铝酸镧。掺铝烧结体密度较素坯有所减小 。Super fine particles of lanthanum chromite were prepared by the sol-gel process,and then mixed with aluminum powder.Phase transformation of aluminum-doped lanthanum chromite during sintering was investigated by DSC and XRD.The results show that Al first melted and then reacted with oxygen to form Al_2O_3.After changes of crystal microstructure,Al_2O_3 reacted with La_(0.9)Ca_(0.1)CrO_3,resulting in the formation of lanthanum hexaaluminate.The density of sintered Aluminum-doped products is lower than that of undoped roughcast products,and the electrical resistivity increased remarkably with increasing the Al-doped amount.

关 键 词：铬酸镧 烧结 相变 

分 类 号：TB326[一般工业技术—材料科学与工程]