(1. 中南大學 粉末冶金國家重點實驗室，長沙 410083；
2. 湖南工業(yè)大學 焊接研究所，株洲 412008)
摘 要: 以La(NO3)3∙6H2O、氨水和ZrC為原料，采用非均相沉淀−煅燒法制備La2O3包覆ZrC復合粉末。采用XRD、SEM、EDS等檢測方法，對包覆前驅(qū)體粉末和La2O3/ZrC復合粉末的成分、結(jié)構(gòu)和組織均勻性進行表征。結(jié)果表明：前驅(qū)體粉末在750 ℃下煅燒2 h后，全部轉(zhuǎn)化為La2O3，粉末為近球形，未發(fā)生長大；La2O3/ZrC復合粉末的粒徑為60~80 nm；包覆后粉末的Zeta電位由48.28 mV變?yōu)?.376 mV，ZrC被連續(xù)且均勻的La2O3納米級殼體層包覆。
關(guān)鍵字: 非均相沉淀；納米復合粉末；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
