tungsten bar Try to use advanced mold processing technology to produce high-quality carbide drawing dies

At present, most of the tube with a tungsten tungsten coil pick from. tungsten filaments In feeding the process, a lot of cracking scrap tungsten plate, yielding low, rolled into a tube shape is not round, the difference between the radial strength of the tube. Moreover, pipe wall thickness tolerance volume tungsten plate although strictly controlled, but the influence of the cigarette seam, the uniformity of the thickness of the tube is undesirable. To this end, we use a powder metallurgy method of trial Spinning seamless tungsten tube. Abstract trial program blanks consumption. Material selection 601 plant purity tungsten powder, its tungsten tube. Set the powder uniformly charged with intermediate tungsten carbide rod plastic sleeve, sealed with a stopper and rounded ends, and press-molded at a maximum pressure of 2 tons / cm, the concentration of the HIP container, and finally on the hydrogen sensor 200KW sintering furnace sintering, the sintering process. Gives the tungsten filament  physical properties of tungsten powder particle size greater difference between the two groups composed of cumulative curves and median diameter, and these two groups of tungsten powder at a temperature of 2350 ~ 2400 ℃ sintered at different times by the density and grain size.