Synthesis of nanocrystalline TaC powders via single-step high temperature spray pyrolysis from solution precursors
Synthesis of nanocrystalline TaC powders via single-step high temperature spray pyrolysis from solution precursors
复制标题
DOI：
10.1016/j.ceramint.2016.11.177
复制
发表时间：
2017-02
影响因子：
5.2
通讯作者：
Zhe Cheng;Paniz Foroughi;A. Behrens
中科院分区：
文献类型：
--
作者：
Zhe Cheng;Paniz Foroughi;A. Behrens
高温陶瓷（HTC）和超高温陶瓷（UHTC）纳米晶粉末是航空航天和其他重要工业应用的重要材料。本研究报道了一种基于高温喷雾热解（HTSP）工艺的低成本单步合成纳米晶HTC和UHTC粉末的方法。合成从氧化物和碳前体溶解在普通有机溶剂中的溶液开始，将其分解成细小的液滴（例如，通过雾化器）。然后，液滴经过溶剂去除、热分解和快速碳热还原（CTR）过程，所有这些都在高温下的管式炉中一次通过。以氯化钽（TaCl5）和酚醛树脂为前驱体制备碳化钽（TaC）为例，在单次stephtsp工艺下，一次最高温度为1650℃，在几分钟内完成，成功地合成了纳米晶TaC UHTC粉末。
Nanocrystalline powders for high temperature ceramics (HTC) and ultrahigh temperature ceramics (UHTC) are important materials for aerospace and other important industrial applications. In this study, a low cost,single-stepsynthesis method for nanocrystalline HTC and UHTC powders is reported, which is based on high temperature spray pyrolysis (HTSP) process. The synthesis starts with solution of oxide and carbon precursors dissolved in common organic solvents, which are broken into fine droplets (e.g., via nebulizer). The droplets then go through processes of solvent removal, thermolysis, and rapidin situcarbothermal reduction (CTR), all in one single pass in a tube furnace operated at high temperature. The synthesis method was demonstrated successfully using the example of tantalum carbide (TaC) from precursors of tantalum chloride (TaCl5) and phenolic resin in asingle-stepHTSP process with maximum temperature of 1650 °C in one pass that finished within minutes, yielding agglomerated nanocrystalline TaC UHTC powders.