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粘結(jié)Sm0.88Nd0.12Fe1.93合金的磁致伸縮與電阻率
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國家自然科學(xué)基金（50971113）；全國博士學(xué)位論文作者專項(xiàng)資金（201037）


Magnetostriction and Electrical Resistivity of Sm0.88Nd0.12Fe1.93 Bonded Composites
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    摘要:

    采用環(huán)氧樹脂粘結(jié)Sm0.88Nd0.12Fe1.93合金顆粒，在外磁場中固化成型制備了磁致伸縮復(fù)合材料, 研究了不同磁場中成型復(fù)合材料的顯微組織、磁致伸縮和電阻率。結(jié)果表明，成型磁場為0 T時，復(fù)合體系為0-3型構(gòu)型，合金顆粒在樹脂基體中無序分布；施加0.6 T的固化磁場，獲得偽1-3型構(gòu)型復(fù)合材料，合金顆粒趨近定向排列。Sm0.88Nd0.12Fe1.93合金顆粒體積分?jǐn)?shù)為30%、固化磁場為0.6 T時，制備的復(fù)合材料在1.3 T磁場下的磁致伸縮系數(shù)（λ∥–λ⊥）可達(dá)–1088×10-6，為鑄態(tài)合金磁致伸縮系數(shù)的86.6%。相同顆粒體積分?jǐn)?shù)的粘結(jié)Sm0.88Nd0.12Fe1.93復(fù)合材料，固化磁場為0.6 T較無固化磁場條件下的電阻率降低85%。

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    Magnetostrictive composites were prepared by mixing Sm0.88Nd0.12Fe1.93 alloy particles with epoxy resin and curing under an external magnetic field. The microstructure, magnetostriction and electrical resistivity of bonded Sm0.88Nd0.12Fe1.93 composites prepared at different external magnetic fields were investigated. Results show that the maximum magnetostriction λ∥–λ⊥ at 1.3 T reaches –1088×10-6 for the bonded composites with 30% (volume fraction) Sm0.88Nd0.12Fe1.93 particles cured under 0.6 T, which is 86.6% of the magnetostriction for the as-cast alloy. Compared with the as-cast Sm0.88Nd0.12Fe1.93 alloy, electrical resistivity of the epoxy-bonded Sm0.88Nd0.12Fe1.93 composites prepared under 0.6 T is 6 orders of magnitude higher. Additionally, electrical resistivity for the composites cured under 0 field is higher than that cured under 0.6 T, which might be related to the alignment of SmNdFe powders.

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竇青青,馬天宇,羅 偉,張昌盛,嚴(yán) 密.粘結(jié)Sm0.88Nd0.12Fe1.93合金的磁致伸縮與電阻率[J].稀有金屬材料與工程,2013,42(4):819~823.[Dou Qingqing, Ma Tianyu, Luo Wei, Zhang Changsheng, Yan Mi. Magnetostriction and Electrical Resistivity of Sm0.88Nd0.12Fe1.93 Bonded Composites[J]. Rare Metal Materials and Engineering,2013,42(4):819~823.]
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  • 收稿日期:2012-04-22
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