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凝膠注模制備多孔Ni-Ti合金的研究
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中南大學(xué) 材料科學(xué)與工程學(xué)院;中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室;中南大學(xué) 粉末冶金國家重點實驗室,中南大學(xué) 材料科學(xué)與工程學(xué)院,中南大學(xué) 材料科學(xué)與工程學(xué)院,中南大學(xué) 材料科學(xué)與工程學(xué)院

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湖南省自然科學(xué)(2015JJ2170)；國家自然科學(xué)基金資助項目(51274246)；中南大學(xué)粉末冶金國家重點實驗室開放課題基金資助項目(10500-410500023)


Porous Ni-Ti alloy prepared by gel-casting
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School of Materials Science and Engineering,Central South University;ChinaKey Laboratory of Ministry of Education for Non-ferrous Metal Materials Science and Engineering;China;State Key Laboratory of Powder Metallurgy,Central South University;China,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University

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    摘要:

    多孔Ni-Ti合金由于其優(yōu)異的形狀記憶性能而廣泛應(yīng)用于醫(yī)用植入材料領(lǐng)域。本文以TiH2粉及霧化Ni粉為原料，采用凝膠注模成型技術(shù)，制備出Ni-Ti凝膠生坯，通過后續(xù)真空干燥、脫脂以及燒結(jié)工藝成功制備出性能優(yōu)異的醫(yī)用植入多孔Ni-Ti合金。運用XRD、SEM對多孔Ni-Ti合金進行了成分及微觀結(jié)構(gòu)表征，分析了不同燒結(jié)溫度對于多孔Ni-Ti合金孔隙率、機械性能、組織成分及微觀形貌的影響。結(jié)果表明，隨著燒結(jié)溫度的增加，孔隙率降低，抗壓強度和楊氏模量增加。對固相體積分?jǐn)?shù)為45vol. %的生坯在1050 ℃條件下高真空燒結(jié)保溫2h，制備出孔隙率為42.65%，抗壓強度為202.65 MPa，楊氏模量為17.14 GPa，主相為NiTi相的多孔Ni-Ti合金，基本滿足人體骨性能需要。

    Abstract:

    Porous Ni-Ti alloys are widely used in biomedical implant material because of its shape memory effect. In this work, porous Ni-Ti alloy with large size and complicated shape was fabricated by gel-casting of TiH2 powder and atomization nickel powder, followed by vacuum drying, thermal debinding and subsequent vacuum sintering process. Effects of sintering temperature on porosity, mechanical properties, phase composition and microstructure of porous Ni-Ti alloys were studied by XRD and SEM. With the increase of sintering temperature, the porosity of Ni-Ti alloy reduces while the compression strength and Young’s modulus increases. Under the condition of vacuum sintering at 1050 ℃ for 2h, the obtained samples with the solid loading of 45vol. % exhibits a porosity of 42.65%, compression strength of 202.65 MPa and Young’s modulus of 17.14 GPa, which match the demands of human bones.

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段柏華,謝春革,王德志,萬幸.凝膠注模制備多孔Ni-Ti合金的研究[J].稀有金屬材料與工程,2017,46(6):1674~1678.[DUAN Bo-hua, XIE Chun-ge, WANG De-zhi, Wan Xing. Porous Ni-Ti alloy prepared by gel-casting[J]. Rare Metal Materials and Engineering,2017,46(6):1674~1678.]
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  • 收稿日期:2015-03-17
  • 最后修改日期:2015-04-09
  • 錄用日期:2015-05-13
  • 在線發(fā)布日期: 2017-11-07
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