直接热解法制备棒状二氧化锆粉体

Study on the preparation of rod-like zirconia powder by direct pyrolysis

以氧氯化锆为原料,借助DTG、SEM、XRD等表征手段,考察了热解温度、热解气氛等工艺参数对直接热解法制备棒状二氧化锆的影响规律。结果表明,氧氯化锆在氧化或水蒸气气氛中均可分解为氧化锆,在同一气氛下的反应路径取决于热解温度。温度、气氛和前驱体种类对氧氯化锆热解产物的形貌和粒度影响较为显著。以ZrOCl_(2)·3.84H_(2)O为热解前驱体,在H_(2)O-N_(2)气氛中于450℃温度下进行热解,可得到粒度较为均匀、长径比为4~6的棒状二氧化锆,通过分解温度的调控,可获得四方相、单斜晶型或两者混合物的二氧化锆粉体。

In this paper,zirconium oxychloride was used as the raw material,and the effects of pyrolysis temperature,pyrolysis atmosphere and other process parameters on the preparation of rod-like zirconia by direct pyrolysis were investigated by means of DTG,SEM,XRD and other characterization methods.The results showed that zirconium oxychloride could be decomposed into zirconia in oxidation or steam atmospheres,and the reaction path at the same atmosphere depended on the pyrolysis temperature.The effects of temperature,atmosphere and precursor type on the morphology and particle size of zirconium oxychloride pyrolysis products were significant.Rod-like zirconia with a relatively uniform particle size and length-diameter ratio of 4~6 could be obtained when ZrOCl_(2)·3.84H_(2)O was used as the pyrolysis precursor,and pyrolyzed at 450℃in a H_(2)O-N_(2)atmosphere.When the decomposition temperature was adjusted,the tetragonal,monoclinic or a mixture of tetragonal and monoclinic ZrO_(2) powders could be obtained.