How are niobium powder compacts made with mechanical presses?

In the context of niobium processing, niobium powder is transformed into "green" (unfired) compacts using mechanical presses. This process involves compressing the fine powder into a desired shape, resulting in a compact with a density typically ranging between 60 and 65 percent of the theoretical maximum.1

Once these compacts are formed, they undergo sintering in a vacuum at temperatures between 2,100 and 2,300 °C (3,800 and 4,150 °F). This stage is critical for achieving the final material properties, as the vacuum environment facilitates the purification of the metal, which improves its overall mechanical characteristics.1