Metal Injection Molding Process Research Overview of Tungsten Electrodes Ⅱ

Pure tungsten and doped tungsten are common anode material, and thorium tungsten, lanthanum tungsten are acting as cathode material. In order to improve the high temperature strength and the recrystallization temperature of tungsten, lanthanum oxide may be employed as the dispersed reinforcing phase. Therefore, lanthanum tungsten electrodes (W - La₂O₃ alloy) are often used as an electrode material. German KIT researchers had adopted tungsten powder with Fisher particle size (1-3 micron) to conduct MIM experiments of lanthanum tungsten electrodes, after sintering at 1600 ℃, then conducting the hot isostatic pressing to obtain basic fully dense parts. The density of lanthanum tungsten electrodes can be improved by increasing the sintering temperature and hot isostatic pressing treatment, but it is often limited by equipment and cost. On one hand, study more granular tungsten powder to do MIM experiment, on the other hand, use Ni as an activating element, studying its effect on the sintering density, and finally successful use of MIM technology to develop a kind of W - 1.5% La₂O₃ electrode with cuppy shape.

Remarks:

1. Fisher particle size: The average particle size of the powder measured by Fisher method. Fisher method is a relative measurement method; we can not accurately determine the true size of powder, it is only used to control the quality processes and products.

2. MIM, namely, Metal Injection Molding, which is a kind of forming method that injecting the plasticized mixture of metal powder and its binder in the model. 

 

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