Sintering of Tungsten Powder by Field Assisted Sintering Technology

Tungsten powder (0.6–0.9 μm) was sintered by field assisted sintering technology  at different working conditions. The sample sintered with in-situ hydrogen reduction pretreatment and pulsed electric current during heating demonstrated the lowest measure of oxygen. The maximum relative density could be achieved was 98.5%, which is from the sample sintered under the condition of  2000 °C, 85 MPa for 30 min. However, the corresponding sintered grain size was 22.2 μm. Nano tungsten carbide powder (0.1–0.2 μm) was used as sintering additive to minimize restricts grain growth. By mixing 5 and 10 vol.% WC with tungsten powder, densification was enhanced and finer grain size would be gotten. Relative density above 99% with grain size around 3 μm was achieved in W–10 vol.% WC sintered at 1700 °C, 85 MPa for 5 min. These are the process of tungsten powder sintered.

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