Abstract
This paper describes the formation and incorporation of dopant phases during technical hydrogen reduction of NS-doped tungsten blue oxide, as required for the development of non-sag properties in the final tungsten wire. Proper dopant incorporation during reduction is essential for assuring that the potassium remains in the sintered tungsten ingot. It is this potassium that enables the formation of rows of potassium bubbles during wire fabrication and consequently the formation of a long-grained interlocking microstructure during subsequent filament operation, which is the key to the non-sag characteristics.
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