Ammonium Paratungstate Preparing W-Al2O3

A new method for direct synthesis of W–Al₂O₃ composite is proposed. W–Al₂O₃ nanostructured composite has been produced by mechanical milling of ammonium paratungstate (APT) and Al powder mixture at room temperature. The milled products have been characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS).

The XRD and EDS results confirmed that direct reduction of APT to α-W took place after 25 min milling. It was observed that α → β phase transition took place after 24 h mechanical milling. SEM micrographs showed that alumina matrix composite reinforced with W could be obtained by one step MSR (mechanically induced self-propagation reaction) process. X-ray diffraction peak broadening equation confirmed that the mean grain size of these particles was in nanometer range which gradually decreased with increasing the milling time.


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