Low-Temperature Rapid Synthesis of Rod-Like ZrB₂ Powders by Molten-Salt and Microwave Co-Assisted Carbothermal Reduction
A novel molten-salt and microwave coassisted carbothermal reduction (termed as MSM-CTR) method was developed to prepare ZrB2 powders from raw materials of ZrO2, B4C, and amorphous carbon. The results indicated that the carbothermal reduction reaction for synthesizing ZrB2 was initiated at the temperature as low as 1150⁰C, and phase pure ZrB2 powders were obtained after only 20 min at 1200⁰C, which were significantly milder than that of the conventional CTR method as well as the modified CTR method even using active metal as additional reducing agents. More interestingly, the as-obtained ZrB2 powders consisted of well-defined single-crystalline nanorods, which had diameters of 40–80 nm and high aspect ratios of >10. These results demonstrated that the MSM-CTR is a simple and efficient route for preparation of high-quality ZrB2 powders.
J. Liu et al., "Low-Temperature Rapid Synthesis of Rod-Like ZrB₂ Powders by Molten-Salt and Microwave Co-Assisted Carbothermal Reduction," Journal of the American Ceramic Society, vol. 99, no. 9, pp. 2895-2898, Blackwell Publishing Inc., Sep 2016.
The definitive version is available at https://doi.org/10.1111/jace.14414
Materials Science and Engineering
Keywords and Phrases
microwaves; molten-salt synthesis; nanorods; reduction; ultrahigh-temperature Ceramics; Amorphous carbon; Amorphous materials; Aspect ratio; Carbon; Fused salts; Metals; Powder metals; Reducing agents; Temperature
International Standard Serial Number (ISSN)
Article - Journal
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01 Sep 2016