混料方法对注凝成型超细氧化锆陶瓷的影响  

Effect of Mixing Methods on Superfine-zirconia Ceramics by Gel-casting

作　　者：许海仙[1] 丘泰[1] 杨建[1] 郭坚[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《人工晶体学报》2011年第2期435-440,共6页Journal of Synthetic Crystals

基　　金：江苏省高技术研究计划项目(BG2002025)

摘　　要：对比了搅拌、滚磨、行星球磨三种混料方法的分散效果,研究了行星球磨工艺对注凝成型超细氧化锆陶瓷(D50=0.19μm)浆料流变性以及对生坯和陶瓷性能的影响,分析了"过磨"浆料粘度增加的原因。结果表明:行星球磨制备的浆料粘度更低,在200 r/min球磨4 h,固相量为50 vol%的浆料起始粘度仅为0.289 Pa.s;颗粒变细是"过磨"浆料粘度增加的主要原因,可通过加入少量分散剂来降低浆料的粘度;适当延长球磨时间,生坯及陶瓷性能均有所提高,球磨12 h制备的陶瓷平均强度达960 MPa,韧性高达17.3 MPa.m1/2。The dispersion effects of stirring,barreling and planetary milled were compared,the influences of planetary milled on rheological behaviors of superfine-zirconia（D50=0.19 μm） slurries and the properties of green bodies and ceramics were studied;the reason in viscosity of overmilled slurries increasing were analyzed.The results show that the viscosity of slurries prepared by planetary milled is lower than others,the initial viscosity of 50 vol% slurries is only 0.289 Pa·s at 200 r/min for 4 h.For the overmilled slurries,the viscosity increasing is attributed to the decrease in particle size of ZrO2 powder,and the viscosity can be significantly decreased by adding a little dispersant.The properties of green bodies and ceramics can be improved by increasing the milling time.The mean bending strength of ceramics is 960 MPa and the fracture toughness can be reach 17.3 MPa·m1/2 when the milling time is 12 h.

关 键 词：超细氧化锆 混料方法 注凝成型 

分 类 号：TQ174[化学工程—陶瓷工业]