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納米羥基磷灰石對血管內(nèi)支架用可降解Mg-Zn-Zr 合金性能的影響
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國家自然科學(xué)基金項目(51071108); 天津市自然科學(xué)基金重點項目(09JCZDJC18500)


Effects of Nanohydroxyapatite Addition on Properties of Mg-Zn-Zr Alloy for Biodegradable Intravascular Stents
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科技部“863”計劃項目(2007AA03Z347)；福建省自然科學(xué)基金(2008J0169)資助

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    摘要:

    作為可降解血管內(nèi)支架材料的探索，制備了Mg-3Zn-0.8Zr合金(質(zhì)量分?jǐn)?shù)，%,下同)及Mg-3Zn-0.8Zr-1HA復(fù)合材料，研究了納米羥基磷灰石(n-HA)對合金力學(xué)性能和生物腐蝕降解性能的影響。n-HA均勻分布于鎂合金基體中，使晶粒細化，抗拉強度和延伸率均高于未添加n-HA合金。模擬體液(SBF)浸泡實驗表明：隨著浸泡時間延長，兩種材料表面形貌差異明顯。浸泡20 d后，含n-HA的復(fù)合材料表面完整，有Ca、P沉積層形成，電化學(xué)測試計算的電流密度為0.701×10-5A·cm-2；而不含HA的合金表面嚴(yán)重脫落形成凹坑，對應(yīng)腐蝕電流密度為1.034×10-5A·cm-2，顯示n-HA顯著增加了鎂合金的耐腐蝕能力

    Abstract:

    To explore biodegradable intravascular stents, Mg-3Zn-0.8Zr-1HA composite (mass fraction, similarly hereinafter) and Mg-3Zn-0.8Zr alloy were prepared to investigate the effects of nanohydroxyapatite (n-HA) on the mechanical and biodegradable properties of Mg-3Zn-0.8Zr alloy. Results indicate that the n-HA particles are distributed uniformly in the matrix, so the grains of the matrix are refined, and the ultimate tensile strength and elongation are increased. The immersion tests in the simulated body fluid (SBF) show that the surface morphologies of the two kinds of materials are quite different as the immersion time is prolonged. After immersion for 20 d, the surface of the composite with n-HA is still perfect and covered with Ca and P, while a lot of pitting occurs on the surface of Mg-3Zn-0.8Zr alloy. The electrical current densities of the composite and the alloy are 0.701×10-5 A·cm-2 and 1.034×10-5 A·cm-2 respectively, which demonstrates that the corrosion resistance of the Mg alloy is significantly improved by the addition of nanohydroxyapatite powders.

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王曉偉,陳民芳,由 臣,劉德寶,魏 軍.納米羥基磷灰石對血管內(nèi)支架用可降解Mg-Zn-Zr 合金性能的影響[J].稀有金屬材料與工程,2010,39(12):2211~2216.[wang xiaowei, chen minfang, you chen, liu debao, Wei Jun. Effects of Nanohydroxyapatite Addition on Properties of Mg-Zn-Zr Alloy for Biodegradable Intravascular Stents[J]. Rare Metal Materials and Engineering,2010,39(12):2211~2216.]
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  • 收稿日期:2009-12-20
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