Influence of Ball-milling on Sintered Body Density of Fine Tungsten Powder

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Duan, Lingjie^1 ; Fan, Jinglian^2

School of Materials Science and Engineering, Tianjin University, Tianjin, China^1

State Key Laboratory for Powder Metallurgy, Central South University, Changsha, China^2

关键词: Activation effect;    Coarser grains;    Density distributions;    Hydrogen reduction process;    Pure tungsten;    Sintered body;    Small samples;    Tungsten powders;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022073/pdf
DOI  :  10.1088/1757-899X/490/2/022073

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.