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Sn-8.5Zn-xBi合金系與NdFeB磁體間的潤(rùn)濕性
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Wettability of Sn-8.5Zn-xBi Alloy System with NdFeB Substrate
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    摘要:

    采用座滴法分別研究在真空和氮?dú)鈿夥罩泻筒煌瑴囟葪l件下純金屬Sn，Zn，Bi及Sn-Zn-Bi系合金在NdFeB磁體上的潤(rùn)濕性。結(jié)果表明：?jiǎn)我辉豐n和Bi與NdFeB磁體間的潤(rùn)濕性不好，接觸角比較大；而Zn與NdFeB磁體間的接觸角為零，潤(rùn)濕性非常好。為了獲得熔點(diǎn)較低、又與NdFeB磁體間潤(rùn)濕良好的合金，配制一定成分的Zn-Sn-Bi系合金，并測(cè)定其熔點(diǎn)。Zn-Sn-Bi合金中，當(dāng)Bi含量增加到1.0%(質(zhì)量分?jǐn)?shù), 下同)以后，隨著B(niǎo)i含量的增加，Sn-Zn-Bi合金與NdFeB磁體間的潤(rùn)濕性改善，原因是Bi減小了液態(tài)合金的表面張力，計(jì)算和實(shí)驗(yàn)都證實(shí)了這一點(diǎn)。Sn-8.5Zn-7Bi熔點(diǎn)為194.3 ℃，合金與NdFeB磁體間的接觸角僅為53.2°

    Abstract:

    Wetting behaviors of NdFeB magnet by molten Sn-Zn-Bi alloy systems at different temperatures were investigated by the sessile drop technique under vacuum and N2 atmosphere. The results show that the wettabilities of NdFeB magnet with liquid pure Sn or pure Bi elements are poor, and their contact angles are higher. While the wettability of NdFeB magnet with liquid pure Zn element is perfect, and the contact angle is near zero. The Sn-Zn-Bi alloys with certain composition were prepared and their melting points were measured in order to obtain good wettability of NdFeB magnet with molten Sn-Zn-Bi alloy and lower melting point. The wetting angles between Sn-Zn-Bi alloys and NdFeB magnet decrease dramatically with increasing the Bi contents from 1.0% to 7.0% (mass fraction) because the surface tension of the alloys is decreased by the addition of Bi, which were confirmed by calculation and experimental results. The melting point of Sn-8.5Zn-7Bi alloy is 194.3 oC, and the contact angle between the molten Sn-8.5Zn-7Bi alloy and NdFeB magnet is 53.2°.

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楊曉紅,范志康,盛尊友,梁淑華,肖 鵬. Sn-8.5Zn-xBi合金系與NdFeB磁體間的潤(rùn)濕性[J].稀有金屬材料與工程,2010,39(2):238~242.[Yang Xiaohong, Fan Zhikang, Sheng Zunyou, Liang Shuhua, Xiao Peng. Wettability of Sn-8.5Zn-xBi Alloy System with NdFeB Substrate[J]. Rare Metal Materials and Engineering,2010,39(2):238~242.]
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  • 收稿日期:2009-09-06
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