(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 湖南工业大学 焊接研究所，株洲 412008)
摘 要: 以La(NO3)3∙6H2O、氨水和ZrC为原料，采用非均相沉淀−煅烧法制备La2O3包覆ZrC复合粉末。采用XRD、SEM、EDS等检测方法，对包覆前驱体粉末和La2O3/ZrC复合粉末的成分、结构和组织均匀性进行表征。结果表明：前驱体粉末在750 ℃下煅烧2 h后，全部转化为La2O3，粉末为近球形，未发生长大；La2O3/ZrC复合粉末的粒径为60~80 nm；包覆后粉末的Zeta电位由48.28 mV变为5.376 mV，ZrC被连续且均匀的La2O3纳米级壳体层包覆。
关键字: 非均相沉淀；纳米复合粉末；La2O3；ZrC
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Institute of Welding Research, Hunan University of Technology, Zhuzhou 412008, China）
Abstract:Using La(NO3)3∙6H2O, liquid ammonia and ZrC as raw materials, La2O3-coated ZrC composite powder was prepared by the heterogeneous precipitation-calcination process. Then, the components, structures and uniformity of the coated precursor and La2O3/ZrC composite powder were characterized by XRD, SEM, EDS and Zeta potential analysis. The results show that the coated precursor transforms completely to La2O3 after calcination at 750 ℃ for 2 h. La2O3/ZrC composite powders are nano-structured, and the particle size range is from 60 to 80 nm. The ζ-potential value of the powders is down to 5.376 mV from 48.28 mV after coating. Generally, the surface of ZrC is consistently, firmly and uniformly coated by a nano-structured La2O3 layer.
Key words: heterogeneous precipitation; nano-composite powder; La2O3; ZrC
