超细二氧化锆的差示扫描量热法分析及物相表征  

Characterization of Zirconia by DSC, XRD and LRS

作　　者：刘源[1] 钟炳[2] 彭少逸[2] 秦永宁[1] 

机构地区：[1]天津大学化工系,天津300072 [2]中科院山西煤炭化学研究所,太原030001

出　　处：《工业催化》1998年第1期55-59,共5页Industrial Catalysis

摘　　要：通过对由超临界干燥制得的超细ZrO_2及含Y_2O_3的超细ZrO_2的热分析和物相表征发现，由超临界干燥法制得的ZrO_2含水量极微，但含有较多的有机物，这些有机物需在空气中在约450℃方可除去。ZrO_2及Y_2O_3－ZrO_2在差示扫描量热（DSC）曲线上400～500℃间出现的放热峰对应其由无定型向四方晶系的转化。和惰性气氛相比，空气气氛有利于这一晶化过程。在ZrO_2中添加微量Y_2O_3有利于稳定ZrO_2的四方晶系。The characterization results show that ultrafine zirconia made by supercritical drying (SCD) contains little water but more organic compounds in it. The organic compounds can be removed in air atabout 450 C. The exothermal peak in the differential scanning calorimetry (DSC) curves for ultrafineZrO, and ultrafine Y,O,--ZrO, is formed by crystallization of ZrO, or Y:O,--ZrO,from amorphous to tetragonal crystallites. The crystallization process is easier in air than in argon atmosphere. Addition oftrace amount of Y,O, favours the stability of tetragonal ZrO, crystallites.

关 键 词：二氧化锆 超细粒子 热分析 催化剂载体 

分 类 号：TQ426.65[化学工程]