Nanoscale tungsten powders were compacted with a steel die and a rubber die respectively. In the case of compaction with a steel die, the relative density of the resulted compact is 28.3% when the unit compacting pressure is 200 MPa. When the compacting pressure was higher than 200 MPa, some defects such as delamination and fracture were observed in the compacts.

 

The compacting pressure for a rubber die can be up to 300 MPa, resulting in a compact free of detects with a relative density of 46.2%. Even with a compacting pressure of 200 MPa, the relative density of the compact can also be up to 44.0%, which is remarkably more than that obtained by compacting with a steel die. It shows that the green density of nanoscale tungsten powder can be greatly improved by compacting with a rubber die.

 

 

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