碳酸铝铵热解制备纳米氧化铝以及陶瓷烧结  

Preparation of Nano Alumina Powder by Pyrolysis of Ammonium Aluminum Carbonate Hydroxide and Sintering of Ceramics

作　　者：马佳进 罗钱 李晨辉[1] 胡梁 周念莺 邹阳[2] MA Jiajin;LUO Qian;LI Chenhui;HU Liang;ZHOU Nianying;ZOU Yang(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Precision Manufacturing Institute,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074 [2]武汉科技大学精密制造研究院,湖北武汉430081

出　　处：《化学与生物工程》2023年第11期12-19,共8页Chemistry & Bioengineering

基　　金：国家科技重大专项(2013ZX02104001)。

摘　　要：以NH_(4)HCO_(3)和NH_(4)Al(SO_(4))_(2)为原料,采用沉淀法合成了前驱体碳酸铝铵(AACH),再经热解得到氧化铝粉体,系统研究了热解温度、干燥方式、NH_(4)HCO_(3)与NH_(4)Al(SO_(4))_(2)物质的量比对前驱体AACH和热解产物氧化铝的影响。结果表明,在NH_(4)HCO_(3)与NH_(4)Al(SO_(4))_(2)物质的量比为10∶1、无水乙醇置换水干燥AACH、热解温度为1025℃的条件下,可以得到粒径约50 nm、比表面积93.23 m^(2)·g^(-1)、分散性较好的纳米氧化铝粉体。当纳米氧化铝粉体中掺入2.0%TiO_(2)时,在含8%H_(2)的N_(2)气氛下1550℃烧结2 h,可以得到相对密度97.40%、体积电阻率3.47×10^(9)Ω·cm的氧化铝陶瓷。Taking NH_(4)HCO_(3) and NH_(4)Al(SO_(4))_(2) as raw materials,we synthesized the precursor ammonium aluminum carbonate hydroxide(AACH)by a precipitation method,and then obtained alumina powder by pyrolysis of AACH.Moreover,we systematically studied the effects of pyrolysis temperature,drying method,and molar ratio of NH_(4)HCO_(3) to NH_(4)Al(SO_(4))_(2) on the precursor AACH and pyrolysis product alumina.The results show that,when the molar ratio of NH_(4)HCO_(3) to NH_(4)Al(SO_(4))_(2) is 10∶1,anhydrous ethanol is adopted to replace water to dry AACH,and the pyrolysis temperature is 1025℃,the nano alumina powder with particle size of about 50 nm and specific surface area of 93.23 m^(2)·g^(-1) with good dispersion can be obtained.In addition,when the nano alumina powder is mixed with 2.0%TiO_(2) and sintered at 1550℃for 2 h under N_(2) atmosphere containing 8%H_(2),the alumina ceramics with relative density of 97.40%and volume resistivity of 3.47×10^(9)Ω·cm can be obtained.

关 键 词：碳酸铝铵 氧化铝 物质的量比 热解温度 干燥方式 体积电阻率 

分 类 号：O614.31[理学—无机化学] TQ174.14[理学—化学]