CAJ | 학술논문

以氯化镍、草酸铵和氨水为原料，通过沉淀转化制备纤维状前驱体。采用XRD、SEM、IR和 DTA/TGA分析手段研究前驱体粉末的成分与形貌。结果表明：在pH=8.4~8.8时得到的前驱体在形貌和成分等方面均不同于在 pH=6.0得到的前驱体，且两种条件下所得前驱体热分解的机理也不同。研究前驱体形貌、热分解气氛、温度及时间对镍粉形貌及分散性的影响，发现前驱体粉末在弱还原性气氛、温度为400~440°C下分解30 min时，最终产品基本保持前驱体的形貌。得到的纤维状镍粉分散性良好，但每根纤维表面不再光滑，而是具有大量微孔的粗糙形态。
이록화얼、초산안화안수위원료，통과침정전화제비섬유상전구체。채용XRD、SEM、IR화 DTA/TGA분석수단연구전구체분말적성분여형모。결과표명：재pH=8.4~8.8시득도적전구체재형모화성분등방면균불동우재 pH=6.0득도적전구체，차량충조건하소득전구체열분해적궤리야불동。연구전구체형모、열분해기분、온도급시간대얼분형모급분산성적영향，발현전구체분말재약환원성기분、온도위400~440°C하분해30 min시，최종산품기본보지전구체적형모。득도적섬유상얼분분산성량호，단매근섬유표면불재광활，이시구유대량미공적조조형태。
Fibrous particulate precursor was obtained by precipitation transformation in the ternary solution system of ammonium oxalate, nickel chloride and ammonia. The composition and morphology of precursor were characterized by XRD, SEM, IR and DTA/TGA analyses. The results show that the chemical composition and morphology of precursor precipitates at pH=8.4?8.8 are different from those of precursor precipitates at pH=6.0, and the mechanisms of the thermal decomposition of the precursors are different. The effects of various conditions in the process of thermal decomposition, including precursor morphology, atmosphere, temperature and time on the morphology and dispersion degree of obtained nickel powders were studied in detail. The final product inherits the morphology of precursor when the thermal decomposition is conducted under a weakly reducing atmosphere at temperature range of 400?440 °C for 30 min. Fibrous nickel powder can be produced with good dispersion, and its shape changes from smooth, straight and compact fiber into loose and curved fiber with rough surface.