注凝成型工艺制备Al_2O_3-ZrO_2(3Y)-SiC复相陶瓷及其性能  

PREPARATION OF Al_2O_3-ZrO_2(3Y)-SiC COMPOSITE CERAMICS BY GELCASTING AND ITS PROPERTIES

作　　者：徐晓虹[1] 焦国豪[1] 吴建锋[1] 饶郑刚[1] 徐瑜[1] 赵芳[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐学报》2010年第10期1953-1958,共6页Journal of The Chinese Ceramic Society

基　　金：国家"973"计划(2010CB227105)资助项目

摘　　要：研究了用注凝成型工艺制备用于太阳能热发电Al2O3-ZrO2(3Y,3%Y2O3,摩尔分数)-SiC(AZS)复相陶瓷。以SiC、纳米ZrO2和Al2O3粉体为原料,加入凝胶有机单体(丙烯酰胺)、交联有机单体(N-N亚甲基双丙烯酰胺)、凝胶引发剂(过硫酸铵)、凝胶催化剂(N-N-N′四甲基乙二胺)、分散剂(柠檬酸胺),制备了固相质量含量高达85%,黏度为52.5mPa·s的A12O3基陶瓷悬浮体,经注凝成型,1480℃烧结样品。检测了料浆及烧结样品的相关理化性能及显微结构。结果表明,悬浮体固化后颗粒仍保持原有的位置,坯体结构均匀;坯体经1480℃烧结,样品吸水率为0.98%,气孔率为1.02%,体积密度为3.843g/cm3,抗弯强度达183.3MPa,经7次抗热震(在空气中急冷,温差为975℃)实验后,样品抗弯强度为150.1MPa。抗热震实验后,抗弯强度下降18.1%,满足太阳能热发电输热管道的要求。Al2O3-ZrO2（3Y,3% in mole Y2O3）-SiC composite ceramics（AZS） used in concentrating power system（CPS） were prepared by gelcasting.The Al2O3 suspension with a solid content up to 85% in mass,and 52.5 mPa·s in viscosity,was prepared with SiC,nano-sized ZrO2 and Al2O3 powders as the raw materials,and additional gel organic monomer（acrylamide）,cross-linked organic monomer（N-N methylene diacrylamide）,gel initiator（ammonium persulphate）,catalyst（N-N-N＇tetramethyl ethylenediamine）,and dispersant（citrate amine）.AZS samples were produce by gelcasting A12O3 suspension and sintered at 1 480 ℃.The microstructures,physical and chemical properties of AZS samples were examined.The results show that the water absorption,porosity,bulk density and bending strength of the AZS sample prepared by gelcasting are 0.98%,1.02%,3.843 g/cm3 and 183.3 MPa,respectively.Those reveal that with in-situ immobilization process of gelcasting,the suspension grains keep their original positions in the solidified green body with homogeneous distribution and without particle agglomeration.After 7 times quenching from high temperature to room temperature（Δθ in the range of 25-1 000 ℃） in air,the bending strength decreased from 183.3 to 150.1 MPa.It can meet the requirement of the heat transfer pipelines in CPS because of only 18.1% loss in strength in the thermal shock test.

关 键 词：氧化铝-氧化锆-碳化硅 复相陶瓷 注凝成型 抗热震性 太阳能热发电 

分 类 号：TQ174[化学工程—陶瓷工业]