纳米晶TaZr_(2.75)C_(3.75)固溶陶瓷粉末的制备与表征  

Preparation and characterization of nanocrystalline TaZr_(2.75)C_(3.75) solid solution ceramic powder

作　　者：蒋杰 易茂中[1] 周远明 彭可[1] JANG Jie;YI Maozhong;ZHOU Yuanming;PENG Ke(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2022年第4期426-435,共10页Materials Science and Engineering of Powder Metallurgy

基　　金：装备预研资助项目(4142XXX107)。

摘　　要：分别以TaCl_(5)和ZrCl_(4)为钽源和锆源,酚醛树脂为碳源,采用溶剂热结合碳热还原法合成单相固溶陶瓷粉末TaZr_(2.75)C_(3.75)(TZC)。通过热力学和原子尺寸效应值计算分析碳热还原法合成TaZrC粉末的可行性,研究乙酰丙酮含量、金属原子浓度以及溶剂种类等工艺参数对粉末相组成、微观形貌以及粒径的影响。结果表明,通过溶剂热结合碳热还原反应,1700℃可制备晶粒尺寸为纳米级的单相Ta ZrC固溶陶瓷粉末。增加乙酰丙酮的含量可以提高粉末的分散性。随着金属原子浓度的提升,粉末从球形转变为不规则形态,平均粒径从微米级(~2.13μm)减小至亚微米级(~0.140μm)。相比丁醇溶剂,乙醇作为溶剂可获得分散性更好、颗粒尺寸更小的粉末。Single-phase solid solution ceramic powders Ta Zr_(2.75)C_(3.75)were synthesized by combining solvothermal and carbothermal reduction.In which,TaCl_(5)and Zr Clwere used as the tantalum and zirconium source respectively and phenolic resin was used as the carbon source.The possibility of the synthesis of TaZr_(2.75)C_(3.75)powders by the carbothermal reduction method was demonstrated by thermodynamic and atomic size effect.The effects of process parameters such as acetylacetone content,metal atom concentration and solvent type on the powder morphology and particle size were investigated.The results show that the single-phase TaZr_(2.75)C_(3.75)solid solution ceramic powders can be prepared by the carbothermal reduction reaction at 1700℃.Increasing the content of acetylacetone can improve the dispersibility of the powders.With increasing the concentration of metal atoms,the powder changes from a spherical shape to an irregular shape,and the average particle size decreases from the micron level(~2.13μm)to the submicron level(~0.140μm).Compared witn butanol solvent,better dispersion and smaller particle size of TaZr_(2.75)C_(3.75)solid solution ceramic powders can be achieved with ethanol as a solvent.

关 键 词：溶剂热 碳热还原反应 碳化物 单相固溶体 纳米晶 

分 类 号：TB332[一般工业技术—材料科学与工程]