The activated sintering of tungsten with Ni or other group VIII elements had been studied by J. H. Brophy and many other investigators. We tried the activated sintering of tungsten with Ni-P alloy by means of the electroless Ni plating on purpose to obtain effective results.
In this experiment, we obtained tungsten compact of a density 18.5g/cm3 by sintering at 1, 000°C for 30 minutes.
The sample used was 0.5μ W powder, with 0.19wt% Ni-P alloy.
It was difficult to obtain the tungsten compact of a higher density than 18.5g/cm3, as the tungsten particle size was larger than 1.5μ. Studies on the shrinkage, density, hardness and microstructure, as well as the chemical analysis and X-ray analysis were made in order to the mechanism of the process.