| 摘要 |
<p>A tungsten-rhenium filament is disclosed. The filament has a re-crystallization temperature above 2000 °C, and it comprises an aluminum-potassium-silicon (AKS) additive. The potassium content of the filament is between 80-110 ppm, and the rhenium content is between 0,05-0,19 % by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared (31) with a rhenium content of 0,05-0,19 % by weight, and a potassium content between 80-110 ppm. The alloy powder is pressed and presintered (32), and thereafter sintered (33) with direct current. A rhenium-tungsten filament is formed (34) which has a metastable crystal structure. The filament is wound (35) on a mandrel, and it is annealed (36) on the mandrel below the re-crystallization temperature. The filament is finally re-crystallized (37) above the re-crystallization temperature. A halogen incandescent lamp with an envelope enclosing a tungsten-rhenium filament is also provided.</p> |
