Cemented carbide material

摘要

Cemented carbide material comprising tungsten carbide (WC) material in particulate form having a mean grain size D in terms of equivalent circle diameter of at least 0.5 microns and at most 10 microns, and a binder phase comprising cobalt (Co) of at least 5 weight per cent and at most 12 weight per cent, W being present in the binder at a content of at least 10 weight per cent of the binder material; the content of the WC material being at least 75 weight per cent and at most 95 weight per cent; and nanoparticles dispersed in the binder material, the nanoparticles comprising material according to the formula CoxWyCz, where X is a value in the range from 1 to 7, Y is a value in the range from 1 to 10 and Z is a value in the range from 0 to 4; the nanoparticles having a mean particle size at most 10 nm, at least 10 per cent of the nanoparticles having size of at most 5 nm; the cemented carbide material having a magnetic coercive force in the units kA/m of at least −2.1XD+14.

主权项

1. A method for manufacturing a cemented carbide body comprising cemented carbide material comprising tungsten carbide (WC) material in particulate form having a mean grain size D in terms of equivalent circle diameter of at least 0.5 microns and at most 10 microns, and a binder phase comprising cobalt (Co) of at least 5 weight per cent and at most 12 weight per cent; the method including providing a sintered body comprising tungsten carbide (WC) particles and a binder material comprising cobalt (Co), the WC particles having mean size D of at least 0.5 microns and at most 10 microns, the content of the WC particles in the sintered body being at least 75 weight percent and at most 95 weight percent, and the content of the binder material in the sintered body being at least 5 weight percent and at most 20 weight percent; and heat treating the sintered body at a temperature in the range from 500 degrees centigrade to 900 degrees centigrade for a period of time; the period in hours being at least (0.8×D)−0.15 and at most (4.3×D)−1.7.