Abstract
In this paper, a new type of Co–Al 2O 3 nanocomposites powder prepared by electroless plating technique will be introduced. The raw Al 2O 3 nanoparticles are 10–20 nm in diameter. The Co plating was carried out at middle temperature (45–50 °C) with application of ultrasonic radiation. Plating rate was determined by measuring the weight gain of powder after plating. High-resolution transmission electron microscopy (HRTEM) reveals that Co–Al 2O 3 nanocomposites particles is of nearly sphere-like shape and is about 50–60 nm in diameter. X-ray diffraction (XRD) indicates that the chemical composition of plating layer is Co–P alloy. The phase structure is different when the reductant content changed. Co–P alloy was found to be amorphous in as-plating Co–Al 2O 3 powder and was transformed into a crystalline phase after sintering. Differential scanning calorimeter (DSC) analysis proves that such a phase transformation occurs at 203–253 °C. Different Co–P content was obtained by changing the Al 2O 3 load.
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