摘要
以尿素和Al(NO3)3·9H2O为原料,通过水热反应法合成α-Al2O3前驱体纤维,研究了合成α-Al2O3前驱体纤维的形成机理和微观形貌以及不同α-Al2O3纤维含量对Al2O3复合陶瓷力学性能的影响。结果表明,α-Al2O3前驱体纤维主要由尿素水解产生的NH4^+,OH^-,HCO3-离子和Al^3+离子重新反应形成,纤维表面光滑,长度为3~6μm,长径比达到6∶1;经1100℃热处理后,α-Al2O3前驱体纤维分解形成α-Al2O3纤维,纤维表面由于气体的释放产生了许多小孔,长度稍短为1~5μm,长径比也达到6∶1。α-Al2O3纤维掺杂α-Al2O3复合陶瓷力学性能表明,当纤维含量为5.0%时,Al2O3复合陶瓷材料获得十分优异的综合室温力学性能:显微硬度为1907 HV,断裂韧性和抗弯强度达到5.8 MPa·m^1/2和813 MPa。
The fiber of precursorα-Al2O3 was synthesized by using urea and aluminum nitrate nonahydrate through hydrothermal reaction.The formation principle ofα-Al2O3 fiber and microstructure were investigated.The effect of differentα-Al2O3 fiber content on mechanical properties of Al2O3 ceramic composites was investigated.The results show that the fiber of precursorα-Al2O3 is mainly reacted by NH4^+,OH^-,HCO3-ions produced of urea hydrolysis and Al^3+ions,which has a smooth surface,a long length of 3 to 6 microns and a good length to diameter ratio of 6∶1.After heat treatment of 1100℃,the fiber of precursorα-Al2O3 is broken down to formα-Al2O3 fiber,which has a porous surface due to the release of gases,a long length of 3 to 6 microns and has also a good length to diameter ratio of6∶1.The mechanical properties of alumina ceramic composites dopedα-Al2O3 fiber show that the fiber content is 5.0%,the excellent room-temperature mechanical properties can be attained:microhardness value is 1907,fracture toughness and bending strength is 5.8 MPa·m^1/2 and 813 MPa.
作者
刘壕东
詹兴宇
赵子栋
童来发
霍颜秋
方一航
赵先锐
LIU Haodong;ZHAN Xingyu;ZHAO Zidong;TONG Laifa;HUO Yanqiu;FANG Yihang;ZHAO Xianrui(Zhejiang Provincial Key Laboratory for Cutting Tools,Taizhou University,Taizhou 318000,China;Jiangsu Maritime Inst,Dept Naval Architecture & Ocean Engn,Nanjing 211170,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2019年第8期41-45,共5页
China Ceramics
基金
台州市大学生科技创新项目
台州市科技局科技计划项目(1802gy05)
浙江省“材料科学与工程”一流学科开放基金
