ES377791A3 - A procedure for preparing an interdispersed volcamber carbide body. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A process for preparing an interdispersed tungsten carbide body with 1 to 30% by weight of cobalt in relation to the total weight of the body, this method being characterized in that it consists of: A) grinding a cobalt powder with a tungsten carbide powder in an inert liquid until the average particle size of the tungsten carbide is less than 1 micron and the tungsten carbide has a specific surface area of at least 3 m2/g; B) recover the interdispersed powder mixture from the liquid medium and dry it in an inert atmosphere, the ground mixture is characterized in that the tungsten carbide contains more than 0.81 and less than 1.0 atomic weight of carbon per atomic weight of tungsten. C) heating the powder without mechanical compulsion in an inert atmosphere at a temperature ts comprised between 1000ºC and th during a range of ts to 20 ts minutes, ts, th and ts being such as: ** (see formula) ** P being the percentage by weight of cobalt; D) then compressing the mixture to a density of more than 95% of the theoretical density at a temperature that can reach up to tm during a range comprised between tm and 20 tm minutes, tm and tm being such as: ** (see formula) ** And cooling the composition at a rapid rate. (Machine-translation by Google Translate, not legally binding)