Abstract
Ultra-fine tungsten powders was produced by high energy mechanically milling in a high-energy attritor mill. Then the mixing powders were consolidated into green compacts by CIP and liquid-phase sintered at 1465°C in the dissociated ammonia atmosphere. Effect on the microstructure and the properties of liquid-phase sintered 93W-4.9Ni-2.1Fe tungsten heavy alloys composed of nanocrystalline sub-micron tungsten powders was investigated. Liquid-phase sintered tungsten heavy alloys exhibited high relative density (above 99.7%), and fine spherical tungsten particles embedded homogeneously in the matrix were obtained due to the combination of ultra-fine tungsten powders and lower sintering temperature. Mechanical properties have been improved compared with the traditionally sintering alloys. The mechanical properties of a tungsten heavy alloy were found mainly dependent on the particles size of raw tungsten powders and liquid-phase sintering temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 385-388 |
| Number of pages | 4 |
| Journal | Cailiao Kexue yu Gongyi/Material Science and Technology |
| Volume | 14 |
| Issue number | 4 |
| State | Published - Aug 2006 |
| Externally published | Yes |
Keywords
- Liquid-phase sintering
- Mechanical milling
- Microstructure
- Nanocrystalline
- Tungsten heavy alloys
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