Making Non-sag Tungsten Wire From APT

(a) providing an aqueous solution of ammonium paratungstate(APT);

(b) adding aqueous potassium hydroxide solution to the aqueous solution of APT as a doping substance, wherein the mole ratio of potassium to ammonium is 0.1 to 10, thereby forming an ammonium potassium paratungstate;

(c) converting the ammonium potassium paratungstate to potassium-doped tungsten blue oxide;

(d) reducing the doped tungsten blue oxide to doped tungsten powder; and

(e) compacting the doped tungsten powder and drawing doped tungsten wire from the compacted powder.

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