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To improve electrical and mechanical properties of electrodes for contact welding, the Cu-Al2O3 nano composite powders were developed by thermo-chemical process. This method uses water-soluble copper and aluminium nitrates as the starting material and consists of four steps: the preparation of nitrates water solution, spray drying of this solution to prepare initial powder with subsequent salt decomposition...
Successful synthesis of nanocrystalline perovskite lead scandium tantalate, PbSc0.5Ta0.5O3, was achieved via a novel one-step mechanical activation route. The as-formed PST exhibits a disordered structure and nanocrystalline domains of ∼8nm. Sintered ceramics made from these powders retain long-range disordered perovskite structure up to 1200°C and a dielectric constant of ∼23,000 is obtained. Sintering...
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