Tungsten Bar - Indirect Heating Sintering

Tungsten bar can be used for the manufacturing process of tungsten filament. So far, most factories adopt vertical sintering method. Such method is working in a water cooling bell, but there is no equipment to keep warm in this bell. Then a large amount of thermal energy generated by electric power are used for heating water, but hot water need cooling device for cooling, this process will consume a lot of power. The temperature field gradient of this method is relatively large, resulting in the density, grain size and degree of porosity of the same batch of tungsten are different. What’s more, density of both ends of the billet is very low, so they must be removed, so that it would waste a part of resources.

To a certain degree indirect heating sintering method can solves these drawbacks, it also improve their quality of billet, which has an excellent energy saving effect. In 1976, an intermediate frequency (IF) induction sintering furnace had been already developed, this device will be able to meet the conditions of uniform temperature field for sintering the tungsten bar. It adopts a tungsten tube as a heating element, and jargonia is a heat insulating material. A sealing member consists of them, the heat energy generated by electrical energy will be surrounded by the sealing member, and concentrated in the middle of the furnace for sintering the wolfram bar.

Horizontal can keep consistent with vertical properties of the bars prepared by this method. In addition, this kind of bars would have a uniform and thin microstructure. The density of both sides of billet does not have a great difference with other parts, so they are not need to be removed. IF induction furnace indirectly heating tungsten products would ensure the stability of its quality, and the more important point is that it can save resources, which plays an important role in environmental protection.

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