Abstract
Tungsten sintered with small Ni and Fe additions at temperatures ranging between 1300 and 1500°C, shows low mechanical strength. The bend strength is about 400 MPa and the samples show always an intercrystalline fracture mode. The strength of the interfaces is controlled by the amount and distribution of impurities such as O, C, P and alloying elements such as Fe and Ni. AES measurements show, that segregation of carbon improves the cohesion of tungsten grain boundaries whereas P segregation decreased the cohesion.
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