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V40-Fe8-Ti-Cr(Ti/Cr=0.95~1.20)合金的結(jié)構(gòu)與吸放氫特性
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國家863項目(2007AA05Z114)


The Structures and Hydrogen Absorption-Desorption Properties of V40-Fe8-Ti-Cr(Ti/Cr=0.95~1.20) Alloys
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    摘要:

    研究了V40-Fe8-Ti-Cr(Ti/Cr=0.95~1.20) 四元合金的結(jié)構(gòu)及吸放氫性能。結(jié)果表明：不同Ti/Cr比的合金均為bcc單相結(jié)構(gòu)，隨著Ti/Cr比的降低，合金的晶格常數(shù)降低，平臺壓升高，吸氫量降低，放氫量先增加后降低；當(dāng)Ti/Cr為1時，得到合金V40Ti26Cr26Fe8在298 K下具有最大的放氫量2.4%(質(zhì)量分?jǐn)?shù))，平臺壓為0.24 MPa。通過計算得到V40Ti26Cr26Fe8的焓變ΔH和熵變ΔS分別為–39.6 kJ·mol-1H和–140.3 J·mol-1·K-1，在4

    Abstract:

    The structures and hydrogen absorption-desorption properties of V40-Fe8-Ti-Cr(Ti/Cr=0.95~1.20) alloys were investigated. All the studied alloys are single-phase with bcc structure. With the decrease of Ti/Cr ratio, the lattice parameters decrease, plateau pressures increase, and hydrogen absorption capacities increase first, then decrease. The V40Ti26Cr26Fe8 alloy with a Ti/Cr ratio of 1.00 has the maximum hydrogen desorption capacity of 2.4% mass fraction with a plateau pressure of 0.24 MPa at 298 K. ΔH and ΔS of the V40Ti26Cr26Fe8 alloy are –39.6 kJ·mol-1H and –140.3 J·mol-1·K-1, respectively, and its plateau pressure at 423 K is calculated to be 27.5 MPa

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童桂容,陳云貴,吳朝玲,鄭 欣,閆康平,周晶晶. V40-Fe8-Ti-Cr(Ti/Cr=0.95~1.20)合金的結(jié)構(gòu)與吸放氫特性[J].稀有金屬材料與工程,2009,38(5):812~820.[Tong Guirong, Chen Yungui, Wu Chaoling, Zheng Xin, Yan Kangping, Zhou Jingjing. The Structures and Hydrogen Absorption-Desorption Properties of V40-Fe8-Ti-Cr(Ti/Cr=0.95~1.20) Alloys[J]. Rare Metal Materials and Engineering,2009,38(5):812~820.]
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  • 收稿日期:2008-05-30
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