The Reason Why Tungsten Is Better Than Lead---（VIII）Recyclable

Tungsten parts are manufactured from powder using a powder metallurgy process. This allows each tungsten part to be recycled back to its original powder form.

The recycling tungsten heavy metal alloy powder is obtained by oxidation-reduction process. The recycling powder was mixed homogeneously with appropriate amount pure nickel and iron powder. Then the mixed powder was pressed and sintered to get the recycling tungsten heavy metal alloy. The results show that the mechanical properties of recycling tungsten heavy alloy are nearly the same to that of the alloy produced by pure metal elements mixed powder. The maximum density is 17.12 g/cm3.Hardness decreases with the increasing sintering temperature. The tensile strength and elongation get the best match when the sintering temperature is 1440 °C, the tensile strength is 922.95MPa, and the elongation is 20.18%.After vacuum heat treatment, the mechanical properties of recycling tungsten alloy improve. The tensile strength increases about 6.44%, and the elongation increase about 43.42%.

To conclude, the recycling cost is relatively small and there is a very small loss in tungsten recycling.

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