摘要
用非均匀成核法和液相共沉淀法相结合的方法制得ZrO2(3Y)包裹Al2O3纳米复合粉体,经干压成型,常压烧结制备ZTA复相陶瓷。通过XRD、TEM对粉料的物相组成和显微形貌进行表征,研究了包裹粉体中煅烧温度和ZrO2含量对烧结体的烧结性能和力学性能的影响。结果表明:随着前驱体粉料煅烧温度的升高,包裹后的Al2O3-ZrO2(3Y)复合陶瓷粉体比表面积降低,粒径变大;ZrO2含量为20wt.%的Al2O3-ZrO2(3Y)复合陶瓷粉体,经过1000℃锻烧后,干压成型制备的烧结样品的抗弯强度和断裂韧性分别高达454.9MPa和11.6MPa.m1/2,SEM观察结果表明烧结体结构致密。
Al_2O_3 nanosized composite powders encapsulated by ZrO_2(3Y) were prepared by heterogeneous nucleation combined with the co-deposition and were molded by dry pressing.Then after sintering,the ZTA was successfully prepared.Phase analysis and morphology of the composite powders were studied by XRD and TEM.The effects of calcined treatment temperatures and ZrO_2 contains on the sintered body' sintered properties and mechanical properties were studied.The results show that increasing the calcination temperature of the precursors,Al_2O_3-ZrO_2(3Y) ceramic composite powders' specific surface area decreased,and the particle sizes increased.When the content of ZrO_2 of Al_2O_3-ZrO_2(3Y) ceramic composite powders was 20wt.% and the composite powders was calcined at 1000℃,the bending strength and fracture toughness of the sintered body by dry pressing reached the maximum value,454.9MPa and 11.6 MPa·m^(1/2),respectively.The result of SEM show that the structure of sintered sample was compact.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2007年第5期760-763,771,共5页
Journal of Materials Science and Engineering
基金
江苏省博士后科研资助计划资助项目(0401011A)
关键词
ZTA
纳米复合粉体
非均匀成核
显微结构
ZTA
nanometer composite powders
heterogeneous nucleation
micro-structure
