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Nb-Ni-Ti體系氫分離合金膜的結(jié)構(gòu)和滲氫性能研究
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國家自然科學(xué)基金（50961004），教育部留學(xué)歸國人員科研啟動(dòng)基金（FM080084）；廣西自然科學(xué)基金（2007230）


Microstructure and Hydrogen Permeability of Nb-Ni-Ti Alloy Membranes for Hydrogen Separation
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    摘要:

    開展了Nb-Ni-Ti體系氫分離合金膜的結(jié)構(gòu)和滲氫性能研究。采用XRD、SEM分析膜片的相結(jié)構(gòu)和組織特征，利用Devanathan-Stachurski雙電解池法測定膜片的氫擴(kuò)散系數(shù)，考察膜片厚度、成分和結(jié)構(gòu)組織對其氫擴(kuò)散系數(shù)的影響。實(shí)驗(yàn)結(jié)果表明：氫分離膜的氫擴(kuò)散系數(shù)均隨膜片厚度的增加而增大。制備的Nb-Ni-Ti體系合金膜都具有兩相結(jié)構(gòu)，即先析出相（bcc-Nb（Ni，Ti）固溶體）和共晶相（bcc-Nb（Ni，Ti）+β2-NiTi），個(gè)別成分點(diǎn)有少量的第三相NiTi2生成。膜片成分和組織結(jié)構(gòu)對氫擴(kuò)散系數(shù)影響顯著，當(dāng)合金中先析出固溶體相比例增加時(shí)，合金中的氫擴(kuò)散系數(shù)也隨著增大，而Ni，Ti含量的變化引起共晶相變化，NiTi相及NiTi2相都不同程度增加了共晶相的相比例而引起氫擴(kuò)散系數(shù)的降低，但同時(shí)在結(jié)構(gòu)上改善了合金在吸氫膨脹過程中發(fā)生的氫脆現(xiàn)象。氫在Nb-Ni-Ti體系氫分離膜中的擴(kuò)散系數(shù)在10-9數(shù)量級范圍。

    Abstract:

    Microstructure and hydrogen permeability of Nb-Ni-Ti alloy membranes for hydrogen separation were investigated. XRD and SEM were employed to characterize the phases and microstructure of Nb-Ni-Ti ternary alloys; hydrogen diffusion coefficients of these membranes with different thickness, composition or microstructure, were measured in Devanathan-Stachurski dual-cell system. The results indicate that hydrogen diffusion coefficient increases with the increasing thickness of these membranes. Basically these alloys are all of two-phase, i.e. the primary bcc-Nb(Ni,Ti) solid solution phase and the eutectic phase of bcc-Nb(Ni,Ti)+β2-NiTi, while just a small amount of NiTi2 phase is observed in very few samples. Microstructure and composition play an important role on hydrogen diffusion. Hydrogen diffusion coefficient is increased with the increase of the content of solid solution phase; the addition of Ni and Ti lead to the variety of eutectic phase composition; the presence of NiTi phase and NiTi2 phase decreases the hydrogen diffusion coefficient, but benefits the resistance to hydrogen embrittlement induced by the crystal expansion/contraction during atomic hydrogen permeation/release. Hydrogen diffusion coefficient of Nb-Ni-Ti alloy membranes falls in the magnitude of 10-9 m2/s.

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劉戰(zhàn)偉,王仲民,劉 菲,胡朝浩,周懷營. Nb-Ni-Ti體系氫分離合金膜的結(jié)構(gòu)和滲氫性能研究[J].稀有金屬材料與工程,2011,40(6):1033~1037.[Liu Zhanwei, Wang Zhongmin, Liu Fei, Hu Chaohao, Zhou Huaiying. Microstructure and Hydrogen Permeability of Nb-Ni-Ti Alloy Membranes for Hydrogen Separation[J]. Rare Metal Materials and Engineering,2011,40(6):1033~1037.]
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  • 收稿日期:2010-06-02
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