Tungsten Alloy Porosity

Elongation and strength of tungsten alloy are sensitive to tungsten alloy porosity. Gas exists in the pore and makes pore happen Ostwald ripening Coarsening, during sintering. Lengthening soaking time will cause bulk effect to billets. When porosity is larger than 0.5%~1.0%, the porosity has serious influence on the characteristics of high density alloy, even more serious than interface segregation of oxygen.

Chun researched about the influence on the characteristic of alloy caused by the formation of pore in W-Ni-Fe alloy. When relative density of alloy was 99%, the shapes and sizes of relic tiny pore could also cause significantly descending or instability of alloy. German researched about the influence on elongation of tungsten caused by porosity. When soaking time was longer than 2h, the pore would grow seriously and the elongation of tungsten alloy descended. While the porosity is larger than 1%, the elongation of tungsten alloy would descend sharply.


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