YSZ含量对多孔氧化铝支撑体断裂韧性的影响  

Effects of various YSZ contents on fracture toughness of macroporous alumina supports

作　　者：李改叶[1] 漆虹[1] 范益群[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《解放军理工大学学报（自然科学版）》2010年第2期168-171,共4页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家973计划资助项目(2003CB615707);国家自然科学基金资助项目(20436030);江苏省高校自然科学研究计划资助项目(2084140701136)

摘　　要：针对陶瓷膜支撑体材料的脆性问题,研究添加适量氧化锆粉体来改善多孔氧化铝陶瓷支撑体的断裂韧性。采用干压成型法,分别在1400°C、1450°C、1500°C、1550°C、1600°C烧后得到相应的支撑体,考察各支撑体的断裂韧性,以及各支撑体的孔隙率和抗折强度随氧化锆添加量的变化规律,采用XRD(X-raydiffraction)物相分析手段对氧化锆增韧多孔氧化铝陶瓷的增韧机理进行了探讨。研究结果表明:1600°C热处理后,当YSZ含量为6wt%时,支撑体的抗折强度和断裂韧性值最大,分别为137MPa和2.5MPa.m1/2,其中,t-ZrO2转变为m-ZrO2是支撑体断裂韧性提高的根本原因。Compared with the supports without YSI powders, the improvements of fracture toughness for macroporous alumina ceramic supports by doping Y2O3 stabilized ZrO2（YSZ） powders were investigated by the dry prassing method. The effect of YSZ content on the apparent porosity, the bending strength and the fracture toughness of the supports heated at 1 400 ℃, 1 450 ℃, 1 500 ℃, 1 550 ℃ and 1 600 ℃ were obtained. The XRD analysis results show that YSZ powders play an important role in the increments of the mechanical properties, especially in the increment of the fracture toughness, that the optimum values exist when the amount of YSZ is 6 wt% in the supports prepared at 1600 ℃, and the corresponding fracture toughness and bending strength are 2.5 MPa · m^1/2 and 137 MPa respectively, and that the phase transformation of t-ZrO2 into m-ZrO2 is the main cause which improves the fracture toughness of Al2O3/YSZ supports.

关 键 词：陶瓷膜 支撑体 YSZ 断裂韧性 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ174.75[化学工程—陶瓷工业]