Abstract
For the improvement of mechanical properties of the sintered tungsten compact, the lowtemperature sintering of tungsten powders mixed with a small quantity of Ni-P alloy was investigated.
The results obtained were as follows.
(1) The maximum sintered density and maximum transverse rupture strength were obtained by the addition of Ni-P alloy with, 0.2-0.5% of Ni.
(2) The grain size of the sintered compacts depends upon the quantity of Ni-P alloy and it was maximum at 0.5-1.0% of Ni.
(3) The hardness increased as the quantity of Ni-P alloy increased, and also as the grain size became smaller.
(4) In the case of 0.5μ tungsten powder, the transverse rupture strength had a maximum value at the sintering temperature of 1300-1400°C.
(5) The maximum transverse rupture strength was obtained when 0.5μ tungsten-powder added with Ni-P alloy containing 0.2--1% Ni was sintered at 1300-1400°C.
