高熔点复合氧化物陶瓷的相可控低温烧成  

CONTROLLABLE PHASE LOW-TEMPERATURE SINTERING OF COMPOSITE OXIDE CERAMICS WITH HIGH MELTING POINT

作　　者：龙颖[1,2] 堵永国[2] 匡加才[1] 刘洪波[1] 郑晓慧[2] 秦峻[2] 

机构地区：[1]长沙理工大学物理与电子科学学院,长沙410114 [2]国防科技大学航天与材料工程学院,长沙410073

出　　处：《硅酸盐学报》2010年第5期837-842,共6页Journal of The Chinese Ceramic Society

基　　金：湖南省自然科学基金(08JJ3100);湖南省科技计划项目(2007-CK3048);长沙市科技计划(K071010–11)资助项目

摘　　要：提出以玻璃陶瓷的母体玻璃作为烧结助剂,低温液相烧结复合氧化物陶瓷的技术思路。研究了BaO–Al2O3–SiO2(BAS)玻璃的高温黏流特性和降温析晶特性,以确定其液相烧结工艺。以BAS玻璃作为烧结助剂,由液相烧结制备了Y2Si2O7,Y2SiO5,3Al2O3·2SiO2或La2Zr2O7复合氧化物陶瓷。结果表明:采用钡长石玻璃陶瓷的母体玻璃作为烧结助剂,可实现高熔点复合氧化物陶瓷的低温烧成,能制备以设计的复合氧化物为主晶相,母体玻璃析晶得到钡长石为次晶相的复合氧化物陶瓷。A technical way was proposed that the composite oxide ceramic could be obtained by liquid phase sintering at low temperatures, using BaO–Al2O3–SiO2 （BAS） glass （a precursor for glass-ceramic） as the sintering additive. The sintering parameters were adjusted by studying the viscous flow characteristics of BAS glass at high temperature and its crystallization characteristics during cooling process. Using BAS glass as sintering additive, Y2Si2O7, Y2SiO5, 3Al2O3·2SiO2 or La2Zr2O7 ceramics were prepared by liquid sintering. The results show that the composite oxide ceramics can be obtained at low temperatures, in which the main crystal phase is the designed composite oxide and the rest phase is BaAl2Si2O8 crystallized from the glass.

关 键 词：钡铝硅玻璃 析晶 液相烧结 热膨胀系数 

分 类 号：TQ174[化学工程—陶瓷工业]