表面改性对氧化锆陶瓷注射成形的影响  

Effect of surface modification on zirconia ceramic injection molding

作　　者：王文利[1] 李笃信[1] 李昆[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金技术》2008年第3期178-182,共5页Powder Metallurgy Technology

基　　金：湖南省自然科学基金资助项目(06JJ20036)

摘　　要：采用改性剂对ZrO2粉末进行表面改性处理制备出了有机/无机包覆的氧化锆陶瓷粉末。用红外光谱表征了粉末颗粒表面官能团的变化,讨论了表面改性对粉末的极性、粒度、安息角、松装密度和振实密度以及对注射成形工艺的影响。研究结果表明:改性剂分子与粉末颗粒表面吸附的羟基发生了Lewis酸碱反应,并形成了包覆吸附;通过表面改性,粉末由极性粉末变为非极性粉末,在环己烷溶液中的粒度由4.88μm减小到0.64μm,团聚系数由41降到5,团聚明显降低,粉末安息角由68°降低到45°,松装密度由0.8g/cm3增加到1.32g/cm3,振实密度由1.45g/cm3增加到2.52g/cm3;表面改性降低了氧化锆注射料的粘度、混料温度、注射温度和注射压力,改善了成形性,装载量从53%提高到58%。Organic/inorganic coated ceramic powders were prepared by applying surfactant to modify the zireonia powder surface. The FTIR was used to analyze the changes of function groups on the powder surface. The influence of surface modification on the powder properties was studied. The results show that： A covalent bond is formed by Lewis reaction between the surface hydroxylic groups that present on the surface of the zirconia powder and the surface modifying reagent molecules. The surface of zirconia powder is coated with the the surface modifying reagent chains; The polarity of the modified powders is changed, the particle size is decreased form 4.88μm to 0.64μm in, meanwhile, the rest angle is decreased from 68° to 45° the apparent density is increased from 0.8g/cm3 to 1.32g/ cm3, tap density is increased from 1.45g/cm3 to 2.52g/cm3; The feedstock prepared by the modified powder not only exhibit low viscosity and excellent formability, but also have low injection molding temperature and pressure, the powder loading of the zirconia feedstock is improved from 53 % to 58 %.

关 键 词：ZrO2粉末 表面改性 陶瓷注射成形 团聚 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业] TS203[轻工技术与工程—食品科学]