CAJ | 학술논문

通过选择性控制合成条件,制备一种新型的纤维状镍钴合金粉末前驱体.该前驱体中镍、钴摩尔配比精确.采用X-射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)和能谱(EDS)研究前驱体粉末的成分与形貌;考察溶液pH值、反应温度、金属离子浓度和表面活性剂对前驱体粉末的形貌和分散性的影响.结果表明:前驱体的形貌取决于前驱体中氨的含量,这种纤维状前驱体为一种复杂的含氨草酸镍钴复盐.形貌控制合成纤维状镍钴合金粉末前驱体的最佳条件为:氨作为配位剂和pH值调节剂,草酸为沉淀剂,反应温度为50～65℃,镍、钴离子总浓度为0.5～0.8 mol/L,PVP为分散剂,溶液pH值控制在8.0～8.4.
통과선택성공제합성조건,제비일충신형적섬유상얼고합금분말전구체.해전구체중얼、고마이배비정학.채용X-사선연사의(XRD)、소묘전경(SEM)、홍외광보(FT-IR)화능보(EDS)연구전구체분말적성분여형모;고찰용액pH치、반응온도、금속리자농도화표면활성제대전구체분말적형모화분산성적영향.결과표명:전구체적형모취결우전구체중안적함량,저충섬유상전구체위일충복잡적함안초산얼고복염.형모공제합성섬유상얼고합금분말전구체적최가조건위:안작위배위제화pH치조절제,초산위침정제,반응온도위50～65℃,얼、고리자총농도위0.5～0.8 mol/L,PVP위분산제,용액pH치공제재8.0～8.4.
A novel precursor of nickel-cobalt alloy powders with an appropriate Ni to Co molar ratio was prepared under selectively synthetic conditions. The composition and morphology of the precursor were characterized by X-ray diffractometry (XRD),scanning electron microscopy (SEM),Fourier transform infrared spectrometry (FT-IR) and energy dispersive spectrometry (EDS). The effects of pH value,reaction temperature,metal ion concentrations and surfactant on the morphology and the dispersion of precursor were investigated. The results show that the morphology of precursor depends on ammonia content in the precursor. A fibriform precursor is a complicated ammonia-containing nickel-cobalt oxalate. The uniform shape-controlled fibrous precursor is obtained under the following optimum conditions:ammonia as complex agent as well as pH adjustor,oxalate as coprecipitator,50-65 ℃ of reaction temperature,0.5-0.8 mol/L of total concentration of Ni2+ and Co2+,PVP as dispersant,and pH 8.0-8.4.