ABSTRACT

Zirconia containing 12 mol-% cerium oxide ceramics were prepared by solid state reaction utilising the conventional, fast firing and two-step sintering methods. The sintering temperature and time were varied aiming to determine ideal sintering profile for these methods. The monoclinic and tetragonal phase contents, microstructure and electrical conductivity of dense specimens were investigated. The linear shrinkage was found negligible up to 1100°C and the maximum rate of shrinkage was achieved at 1150°C. Densification increased up to 2 h for conventional sintered specimens. Stabilisation of tetragonal phase in non-isothermally sintered specimens occurred at a high temperature (1500°C). Specimens sintered by the two-step method attained high density along with small grain sizes. Optimised sintering profiles were determined for all the sintering methods used.

摘要

使用常规的快速烧制和两步烧结方法通过固态反应制备含有 12 mol% 氧化铈的氧化锆陶瓷。烧结温度和时间是变化的，目的是确定这些方法的理想烧结曲线。研究了致密试样的单斜和四方相含量、微观结构和电导率。发现线性收缩率高达 1100°C 时可以忽略不计，并且在 1150°C 时达到最大收缩率。传统烧结试样的致密化增加了 2 小时。非等温烧结试样中四方相的稳定发生在高温 (1500°C) 下。通过两步法烧结的试样获得高密度和小晶粒尺寸。