Abstract
In the first report, characteristics of sintering on Ni-P alloy coated tungsten powders were described. In the present study, authors examined sintering behaviors of Ni-P-W composite powders and the properties of compacts.
The results were as follows;
(1) By the chemical mixing, we obtained better compacts as compared with the mechanical mixing. However, it is expected that by improving the powder size and mixing condition the compacts of full density can be obtained even by the mechanical mixing.
(2) The activation energy of densification of Ni-P alloy coated tungsten powder specimens was 41, 000cal/mol.
(3) The transverse rupture strength of Ni-P alloy coated tungsten powder specimens were inferior to those of nickel coated tungsten powder specimens.
(4) Tungsten pipes and blocks with tungsten contents of more than 99.5% were obtained in this way, and sintered densities of the compacts were more than 19g/cm3.
