| abstract |
A creep-resistant sintered alloy having a tiered structural arrangement of one or several refractory metals Mo, W, Nb, Ta, V, Cr containing certain doping agents, as well as a process for producing the same. The special doping agents are compounds and/or mixed phases of these compounds selected from the group of oxides, nitrides, carbides, borides, silicates or aluminates having a melting point higher than 1500°C. The size of their grains is 1.5 mum, their proportion in the alloy is comprised between 0.005 and 10 weight %. Unlike in the known state of the art, the use of potassium as doping agent is avoided in this alloy. A good reproducible consolidation and in particular high densities during sintering can thus be obtained. Furthermore, this alloy has better ambient temperature, heat and creep resistance properties than known alloys of refractory metals with a tiered structural arrangement. |