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Mg67-xCaxNi33 (x=0, 5, 10, 15, 20, at%)合金的物相及儲(chǔ)氫性能研究
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上海市科委重大專(zhuān)項(xiàng) (10DZ2211000)


Study of Phase Composition and Hydrogen Storage Properties of Mg67-xCaxNi33 (x=0, 5, 10, 15, 20, at%) Alloys
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    摘要:

    采用感應(yīng)熔煉、甩帶結(jié)合機(jī)械球磨法制備了Mg67-xCaxNi33 (x=0, 5, 10, 15, 20, at%) 儲(chǔ)氫合金。研究了Ca含量及制備工藝對(duì)合金相結(jié)構(gòu)和儲(chǔ)氫性能的影響。結(jié)果表明，制備工藝 (熔煉，熔煉+球磨，熔煉+甩帶+球磨) 對(duì)儲(chǔ)氫合金的物相組成影響不大，而含Ca的合金經(jīng)過(guò)甩帶后容易形成非晶。不含Ca的Mg67Ni33 合金主要由Mg2Ni相組成，并含有少量的Mg相；隨著Ca含量升高，合金中的Mg2Ni相逐漸減少，而MgNi2相和Mg2Ca相逐漸增加。當(dāng)Ca含量增加到20at%時(shí)，Mg47Ca20Ni33則主要由MgNi2和Mg2Ca組成，幾乎沒(méi)有Mg2Ni生成。P-C-T測(cè)試結(jié)果表明，在573 K下，Mg67-xCaxNi33合金的最大吸氫量隨著合金中Ca含量的升高而降低，這主要是由于Mg2Ni相含量減少造成的。吸氫后的Mg67Ni33主要由Mg2NiH4組成，而含Ca合金吸氫后則主要由Mg2NiH4、CaH2和不吸氫的MgNi2相組成

    Abstract:

    Mg-based hydrogen storage alloys Mg67-xCaxNi33 (x=0, 5, 10, 15, 20, at%) were prepared by means of induction melting，melt-spinning and ball milling. The effects of Ca content and preparation technologies on phase composition and hydrogen storage properties were studied. The results show that the preparation technologies (as-cast, casting + ball milling and casting + melt-spinning + ball milling) have little effect on the phase composition. The alloys containing Ca can form amorphous after melt-spinning. Mg67Ni33 alloy are mainly composed of Mg2Ni and a little quantity of Mg. The content of Mg2Ni decreases, while MgNi2 and Mg2Ca increase with the increase of Ca content in Mg67-xCaxNi33 alloys. When Ca content reaches 20at%, Mg47Ca20Ni33 alloy mainly consist of MgNi2 and Mg2Ca phase. P-C-T tests show that the maximum hydrogen storage capacity of Mg67-xCaxNi33 alloys decreases with increase of Ca content due to the decrease of Mg2Ni phase. After hydrogen absorption, Mg67Ni33 consists of Mg2NiH4 phase, while Ca containing alloys Mg67-xCaxNi33 alloys consist of Mg2NiH4, CaH2 and MgNi2

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郭志剛,曾小勤,常建衛(wèi),丁文江. Mg67-xCaxNi33 (x=0, 5, 10, 15, 20, at%)合金的物相及儲(chǔ)氫性能研究[J].稀有金屬材料與工程,2012,41(6):1080~1084.[Guo Zhigang, Zeng Xiaoqin, Chang Jianwei, Ding Wenjiang. Study of Phase Composition and Hydrogen Storage Properties of Mg67-xCaxNi33 (x=0, 5, 10, 15, 20, at%) Alloys[J]. Rare Metal Materials and Engineering,2012,41(6):1080~1084.]
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  • 收稿日期:2011-06-01
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