STUDY ON WARM COMPACTING BEHAVIOR OF HIGH-DENSITY TUNGSTEN ALLOY POWDERS

The shaping behavior of 93W 5Ni 2Cu and 93W 4 9Ni 2 1Fe was studied during warm compacting at different temperatures The results show that warm compaction increases the density of greens effectively, and the peak of the density tempcrature plot appears at 150℃; compared with the compaction at room temperature, warm compaction(WC) remarkably reduces green's spring back, the ejection force applied to warm compacted green of W Ni Cu fluctuates markedly and decreases greatly while green moves in the die; for W Ni Cu powder. After sintering the displacement during WC is larger than that at room temperature under the same pressure, the radial shrinkage of WC parts is lower, and WC can improve microstructure of high density tungsten alloys