Abstract
Alumina‐nickel powders have been prepared via electroless‐nickel (EN) coating of submicrometer‐sized alumina powder. The EN layers contain 5.1 ± 0.4 wt% phosphorus and are very unevenly distributed on the surfaces of the alumina particles. These layers consist of amorphous and microcrystalline phases. At temperatures greaterthan equal to1300°C, the EN layers de‐wet from the alumina surfaces to become discrete, round particles in the alumina matrix. The alumina‐EN pellets can be sintered to reach ~95% of the theoretical density at 1500°C for 4 h in graphite crucibles. The phases of the sintered samples consist of alumina, nickel, and nickel phosphides. However, in the exterior region of the sample sintered at 1500°C for 4 h, Ni3Al will also form.
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