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

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.