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LaFe11.6Si1.4吸氫動(dòng)力學(xué)及其氫化物穩(wěn)定性研究
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國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(50731007)和國(guó)家高技術(shù)研究發(fā)展計(jì)劃項(xiàng)目(2007AA03Z440)資助


Hydrogen Absorption Kinetics of LaFe11.6Si1.4 Alloy and Its Hydride Stability
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    摘要:

    采用P-C-T測(cè)試儀研究了磁致冷材料LaFe11.6Si1.4合金在不同溫度下的吸氫動(dòng)力學(xué)性能,發(fā)現(xiàn)在30~80 ℃范圍內(nèi),溫度升高有利于LaFe11.6Si1.4氫化物的形成。LaFe11.6Si1.4合金氫化物在不同溫度下的放氫P-C-T曲線表明:壓力變化在0~4 MPa內(nèi),沒(méi)有出現(xiàn)放氫平臺(tái),隨著壓力降低,合金中含氫量逐漸降低。采用熱分析方法研究溫度變化后合金氫化物的熱穩(wěn)定性,TG曲線表明:溫度升高,合金中的氫逐漸放出,在室溫至60 ℃以?xún)?nèi),放氫量較少,超過(guò)60 ℃后,溫度升高放氫量加大。作者提出可以通過(guò)升溫或降壓的手段有效調(diào)節(jié)合金中的氫含量,進(jìn)而調(diào)控合金居里溫度的思路

    Abstract:

    The hydrogen absorption kinetics of the magnetic refrigeration material LaFe11.6Si1.4 alloy at different temperatures was investigated by the P-C-T testing. It is found that increasing temperature conduces to form the hydride of LaFe11.6Si1.4 at 30~80 ℃. The hydrogen desorption P-C-T curves of LaFe11.6Si1.4 hydrides at different temperatures show that no hydrogen-desorption platform appears at a pressure of 0~0.4 MPa, and the hydrogen in the alloy gradually decreases with the decreasing of pressure. A thermal analysis is used to study the thermal stability of temperature for the hydride. The TG curve shows that the hydrogen in the alloy gradually releases with the increase of temperature up to a relatively little value at 60 ℃, then increases above 60 ℃. An effective method to regulate the hydrogen content in the alloy by increasing temperature or decreasing pressure then to controll the Curie temperature of alloy is presented in this article

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王金偉,陳云貴,唐永柏,肖素芬,涂銘旌,劉 濤,張恩耀. LaFe11.6Si1.4吸氫動(dòng)力學(xué)及其氫化物穩(wěn)定性研究[J].稀有金屬材料與工程,2009,38(11):2001~2004.[Wang Jinwei, Chen Yungui, Tang Yongbai, Xiao Sufen, Tu Mingjing, Liu Tao, Zhang Enyao. Hydrogen Absorption Kinetics of LaFe11.6Si1.4 Alloy and Its Hydride Stability[J]. Rare Metal Materials and Engineering,2009,38(11):2001~2004.]
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  • 收稿日期:2008-11-06
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