性能的影響
(南京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，南京 210009)
摘 要: 研究Ni部分取代Al對Zintl相合金SrAl2結(jié)構(gòu)和儲氫動力學(xué)性能的影響。對合金的吸氫動力學(xué)曲線進行擬合，得到了動力學(xué)回歸方程，并分析了合金的吸氫控制步驟。XRD分析表明，Ni取代Al后合金主要由SrAl2、Sr5Al9、AlNi和SrAl相組成；隨著Ni取代量的增加，SrAl2與Sr5Al9相逐漸減少，而AlNi和SrAl相逐漸增加。氫化測試表明，Ni的加入降低了合金的最大吸氫容量，但是卻極大地提高了合金的吸氫動力學(xué)性能。
關(guān)鍵字: 儲氫材料；SrAl2合金；Zintl相；動力學(xué)
（College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China）
Abstract:The effect of partial substitution of Al by Ni on the crystal structure and hydrogenation kinetics of the Zintl phase alloy SrAl2 was studied by X-ray diffraction (XRD) and hydrogenation measurements. The kinetic parameters and control steps for the hydrogenation of SrAl2−x<, /I>Nix alloys were studied. The results show that the Ni-substituted alloy is mainly composed of SrAl2, Sr5Al9, SrAl and AlNi phases. With the increase of Ni substitution content, the amount of SrAl2 and Sr5Al9 phases decreases, while the amount of SrAl and AlNi phase increases. The maximum hydrogen absorption capacity is decreased, but the hydrogenation kinetics of the alloy is improved greatly after Ni substitution.
Key words: hydrogen storage material; SrAl2 alloy; Zintl phase; kinetics
