Abstract
6∼8wt% yttria-stabilized zirconia (8YSZ) ceramic powders with high t’ phase content could be obtained by air plasma spraying (APS). However, a small amount of high-temperature c phase was contained in APS-8YSZ due to the fast cooling rate, which was required to be transformed into the t’ phase through heat treatment. In this study, APS-8YSZ powders were annealed at 1000-1200°C for 30-150 min to investigate the influence of annealing temperature and time on the phase components of APS-8YSZ powders. As a result, the suitable heat treatment conditions are determined by analyzing the phase constitutions of annealed powders through XRD and multi-peak fitting, wherein, the optimal annealing parameter is 1000°C for 90 min. Besides, dense 8YSZ bulk ceramics with pure t’ phase and fine-grained structure were prepared by SPS at 1300°C for 5min.
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