Tungsten Doped ZrB2 Powder Synthesized Synergistically by Co-Precipitation and Solid-State Reaction Methods

Abstract

Firstly, an amorphous precursor of hydrous nano-ZrO2–WO3 powder was precipitated by a co-precipitation method in alcohol-water mixed solvent using ammonia as a precipitator. Then, a mixture of tungsten doped ZrB2 and W2B5 powder was successfully synthesized via a solid-state reaction by borothermal and carbothermal reduction using nanocarbon, amorphous boron powders and as-synthesized amorphous nano-ZrO2–WO3. Furthermore, thermodynamic calculations clarify the above-mentioned reactions may occur. The mass and heat flow of the samples were monitored by thermal analysis. The crystallographic structure was identified by X-ray diffractometry. The size and morphology of the particles were characterized by TEM microscopy. The combined effects of uniformly distributed tungsten and the complex physicochemical changes effectively improved the solid state reactions.