IF Furnace for Highly Purity Tungsten Bar

Most high-purity tungsten bars are formed by conventional vertical sintered manufacturing processes, this kind of traditional process can consume a lot of power. In addition, at the time of preparation, tungsten bar would be affected by hydrogen flow and voltage fluctuations. If the operators have insufficient professionalism or their operations have some differences in the mass-produced, which will result in different quality of products in the same batch. On the contrary, if sintering in the intermediate frequency (IF) furnace, it would not only cost the lower energy, but also has with high collection rate.

Chemical compositions of tungsten bars made by the two processes are the same. So, IF furnace sintering method can also produce highly purity tungsten bars. Compared to the traditional production method, the density and hardness of wolfram bars formed by medium frequency furnace are much higher, and distribution of its grain is uniform. Density distribution of each part of wolfram bar made by conventional sintering is parabolic state from the top down, the density of a tungsten bar has a difference of 0.37g / cm3. The density of a wolfram bar produced by IF firing only has a difference of 0.2 g / cm3, whose density distribution is more uniformity than the traditional one. Vertical furnace can only hold a tungsten bar, which would take away a lot of heat from surface because of the excessive hydrogen, resulting in the surface temperature of tungsten is lower than the core temperature. However, wolfram bar itself is heating element in medium frequency furnace, so that the core temperature will be higher than the surface temperature. Therefore, the grains of a sintered tungsten bar will be unevenly distributed. For IF sintering, it can be placed more tungsten bars which can be displayed closely, then the heat taken away by hydrogen will be relatively less. Therefore, the final products would have more uniform density distribution.

All in all, IF sintering not only has a capacity of producing a higher purity tungsten bar, but also ensures a stable quality for the manufacturing of goods in large quantities. Further, since the power consumption is low, the required cost is also less. IF sintering adopts eddy current sensor which can make crucible furnace heat and then radiation to the tungsten, so the outside and inside of tungsten bars are nearly the same, therefore the tungsten grains of cross-section are uniform.

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