Multi-phase Surface Modification of Mg17Al12-Based Hydrogen Storage Alloys
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摘要:
采用機(jī)械球磨法制備Mg17Al12合金，系統(tǒng)研究了球磨時(shí)間對Mg17Al12形成過程的影響；并以球磨12 h的Mg17Al12合金為基體，添加5%、10%（質(zhì)量分?jǐn)?shù)）的Ni、Cu單質(zhì)，通過機(jī)械球磨對合金進(jìn)行表面復(fù)相改性。采用P-C-T測試儀測定合金的儲氫性能，研究添加不同質(zhì)量分?jǐn)?shù)的單質(zhì)對Mg17Al12合金儲氫性能的影響。結(jié)果表明：球磨12 h Mg17Al12的吸氫速率較慢，吸氫時(shí)間較長，需在1400 min達(dá)到最大吸氫量為4.1%（質(zhì)量分?jǐn)?shù)），接近其理論吸氫量4.4%，Mg17Al12的吸放氫過程是可逆的。Cu對Mg17Al12進(jìn)行表面復(fù)相改性，可以顯著改善其吸氫動(dòng)力學(xué)性能，添加5%Cu和10%Cu的合金在623 K，240 min的吸氫量分別為4.07%和3.9%。經(jīng)過Cu和Ni復(fù)相改性后的Mg17Al12具有較好的放氫性能，添加5%Cu合金在553 K放出3%的氫氣。Ni對Mg17Al12進(jìn)行表面復(fù)相改性，對其性能有一定的提高，但是和Cu相比，并不明顯
Abstract:
Mg17Al12 alloys were prepared by mechanical ball milling for systematical studying the influence of milling time on the information of Mg17Al12. In order to modify the surface performances of the alloys, 5% (mass fraction) or 10% of simple substances (Ni and Cu) were added into Mg17Al12 alloys mechanically milled for 12 h. The storage properties of the alloys were determined by P-C-T apparatus. The effects of different mass fraction simple substances on the hydrogen storage properties of the alloys were investigated. The results show that the Mg17Al12 has a slow rate of absorbing hydrogen and a long-term absorption process, the maximum reversible storage capacity reaches 4.1wt% after 1400 min which is closed to the theoretical one (4.4wt%). Cu can modify the surface performance and enhance the kinetics markedly. The alloy with 5%Cu has a hydrogen absorption of 4.07wt% at 623 K in 180 min as the alloy with 10%Cu the hydrogen absorption of 3.9wt%. Mg17Al12 modified by adding Cu and Ni has a better absorption performance, as the alloy with 5% Cu can desorb 3wt% hydrogen at 553 K. Ni can modify the surface performance and enhance the properties, too. But its effect is not obvious compared to that of Cu
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陳玉安,周彩瑜. Mg17Al12基儲氫合金的表面復(fù)相改性[J].稀有金屬材料與工程,2013,42(12):2513~2518.[Chen Yu’an, Zhou Caiyu. Multi-phase Surface Modification of Mg17Al12-Based Hydrogen Storage Alloys[J]. Rare Metal Materials and Engineering,2013,42(12):2513~2518.] DOI：[doi]