Abstract
The fine pure tungsten powder with a BET particle size of 0.14 μm was prepared by sol spray drying-calcination-hydrogen reduction process. The influences of ball-milling ways (dry-milling and wet-milling) on the tungsten powder morphology and powder formability were investigated. The changes of pure tungsten properties with sample size (small samples with a thickness of 2.5mm and big samples with a thickness of 2cm) were explored. In addition, the variation of microstructure and grain size with different ball milling way and sample size was studied in detail. Results show that both dry-milling and wet-milling have a great improvement in powder formability. The densities of dry-milling sintered bodies are obviously higher than that of wet-milling bodies. At the same time, the density distribution of dry-milling sintered bodies is more uniform in big samples. The wet-milling powder has a wider particle size distribution and a strong activation effect, thus the wet-milling powder sintered body has a coarser grain.
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