(1. 上海大学 上海市钢铁冶金重点实验室, 上海 200072；
2. 上海大学 理学院, 上海 200346)
摘 要: 采用溶胶-凝胶法制备了粒径为30～60 nm的SrCe0.9Y0.1O3-α超细粉, 并用此粉体制得了致密高温质子导电陶瓷, 研究了成型压力对素坯的影响, 陶瓷的烧结行为及微观结构。 结果表明： 当成型压力为20~250 MPa时, 素坯的相对密度会呈现峰值(54.25%); 根据陶瓷的线性收缩率的变化趋势, 将烧结分为烧结初期（<1 150 ℃）, 烧结中期（1 150～1 250 ℃）和烧结后期（>1 250 ℃）3个阶段； 采用RCS(速控烧结)烧结制度在较短的烧结时间里获得相对密度为98 ％且平均晶粒尺寸小于1 μm的致密陶瓷； SEM观察发现陶瓷断口的孔洞中出现了新物相, 推测其主要成分可能是SrCO3。
关键字: SrCe0.9Y0.1O3-α；高温质子导电陶瓷； 致密； 溶胶-凝胶法
（1. Shanghai Key Laboratory for Ferro Metallurgy,
Shanghai University, Shanghai 200072, China；
2. School of Science, Shanghai University, Shanghai 200346, China）
Abstract: The fine SrCe0.9Y0.1O3-α powders with the size range of 30-60 nm were prepared by sol-gel method, and then were used to prepare dense proton conducting ceramics. The influences of compaction pressures on green relative densities, sintering behavior and microstructure were studied. The green relative density reaches the peak value(54.25%) at the compaction pressure range of 20~250 MPa. According to the linear shrinkage rate of ceramics, the sintering process can be divided into three stages: initial stage(<1 150 ℃), medial stage(1 150-1 250 ℃) and final stage(>1 250 ℃). The dense ceramic with relative density of 98% and average grain size of less than 1 μm can be achieved within a shorter dwelling time by rate-controlled sintering(RCS) process. The new phases like flowers appear in the hole of ceramics fracture through SEM analysis. The components are supposed to be SrCO3.
Key words: SrCe0.9Y0.1O3-α; high temperature proton conducting ceramics; dense; sol-gel method
