Abstract: The green compact properties of ZrO₂ spray-dried powders were studied by means of pressure-density compaction
curves of the powder and SEM photographs．The results show found that the granule size distribution of the spray-dried powder has a smaller effect on the green compact density．
Granule yield strength, which depends on the dimension of granules and the relative humidity in the environment, is a critical factor influencing the
uniformity of green compact microstructures．Therefore, plasticizing granules and eliminating larger granules can improve the microstructure
of the green compact．

Key words: ZrO₂ spray-dried powder, green compact properties, granule size distribution, relative humidity in the environment