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放電等離子燒結(jié)制備納米晶雙相耦合(NdDy)11.5(FeCoNb)82.4B6.1致密磁體
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國家自然科學(xué)基金(50801049);四川大學(xué)青年基金(06003)


Coupled Dense Nanocomposite (NdDy)11.5(FeCoNb)82.4B6.1 Bulk Magnets Prepared by SPS
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    摘要:

    使用放電等離子燒結(jié)(SPS)制備致密的納米晶交換耦合Nd2Fe14B/α-Fe永磁合金。研究燒結(jié)溫度、時間、壓力對合金磁性能和顯微組織的影響。結(jié)果表明,隨溫度、壓力的升高,密度增大,磁能積增加;但溫度過高或時間過長,使得晶粒長大,導(dǎo)致矯頑力降低。在燒結(jié)壓力為500 MPa,燒結(jié)溫度為700 ℃保溫3 min后,得到密度為7.6 g/cm3,晶粒細(xì)小的致密塊體,其磁性能為:Br=0.81 T,Hci =856 kA·m-1,(BH)m =106 kJ·m-3,其晶粒大小約20 nm。

    Abstract:

    The exchange coupled dense nanocomposite Nd2Fe14B/α-Fe isotropic bulk magnets were prepared by Spark Plasma Sintering (SPS) method. Influence of sintering temperature, time and pressure on the magnetic properties and microstructure was investigated. It is found that the density and magnetic energy product increased with the sintering temperature and pressure increasing; but the coercivity decreased with the temperature or time further increasing. After sintered at 700 ℃, 500 MPa, and held for 3 min, dense bulk magnets with fine grains of about 20 nm were achieved, whose magnetic properties were: Br=0.81T , Hci =856 kA·m-1, (BH)m =106 kJ·m-3; the density was 7.6 g/cm3.

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馬毅龍,劉 穎,李 軍,杜慧龍,高 靜,高升吉.放電等離子燒結(jié)制備納米晶雙相耦合(NdDy)11.5(FeCoNb)82.4B6.1致密磁體[J].稀有金屬材料與工程,2009,38(12):2246~2249.[Ma Yilong, Liu Ying, Li Jun, Du Huilong, Gao Jing, Gao Shengji. Coupled Dense Nanocomposite (NdDy)11.5(FeCoNb)82.4B6.1 Bulk Magnets Prepared by SPS[J]. Rare Metal Materials and Engineering,2009,38(12):2246~2249.]
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  • 收稿日期:2008-11-27
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