Metal Injection Molding Process Research Overview of Tungsten Electrodes Ⅰ

In recent years, people have pay more and more attention to metal injection molding of refractory metal, which is mainly used to produce parts of complex shape of small size, we call it MIM for short, and its full name is Metal Injection Molding. Under normal circumstances, this type of parts is functional unit under high temperature, and the requirement of high temperature strength and fatigue performance are relatively not so harsh, although this reduces the density requirements, but it achieves a nearly net shape, reducing the machine processing costs. Tungsten, owns the highest melting point at the refractory metals, which is the most widely used lighting electrode material.

The traditional preparation process of tungsten electrodes is showed as bellow: machining the tungsten rod which has been sintered and deformed to give pure tungsten / tungsten alloy electrodes. Because tungsten belongs to rare metal and its machining is difficult, therefore, net forming of tungsten electrodes are more and more paid attention in recent industry. Philips Advanced Metrology Systems Corporation is one of the earlier units to carry out a refractory metal injection molding research and development, the use of MIM to manufacture high-pressure gas discharge lamp with tungsten electrodes, in comparison with conventional tungsten electrode wounded with tungsten wire, MIM can achieve tungsten electrodes with different and complex shapes, which facilitate designers to design its shape according to the function of the electrode.



 

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