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Al2O3-Sn57Bi43/环氧树脂复合材料的导热及电性能

杨李懿 葛凡 汪蔚 冉涛 李艳飞

杨李懿, 葛凡, 汪蔚, 等. Al2O3-Sn57Bi43/环氧树脂复合材料的导热及电性能[J]. 复合材料学报, 2023, 40(11): 6110-6118. doi: 10.13801/j.cnki.fhclxb.20230105.004
引用本文: 杨李懿, 葛凡, 汪蔚, 等. Al2O3-Sn57Bi43/环氧树脂复合材料的导热及电性能[J]. 复合材料学报, 2023, 40(11): 6110-6118. doi: 10.13801/j.cnki.fhclxb.20230105.004
YANG Liyi, GE Fan, WANG Wei, et al. Thermal conductivity and electrical properties of Al2O3-Sn57Bi43/epoxy composites[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6110-6118. doi: 10.13801/j.cnki.fhclxb.20230105.004
Citation: YANG Liyi, GE Fan, WANG Wei, et al. Thermal conductivity and electrical properties of Al2O3-Sn57Bi43/epoxy composites[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6110-6118. doi: 10.13801/j.cnki.fhclxb.20230105.004

Al2O3-Sn57Bi43/环氧树脂复合材料的导热及电性能

doi: 10.13801/j.cnki.fhclxb.20230105.004
基金项目: 浙江省基础公益研究计划项目(LGG19E030006)
详细信息
    通讯作者:

    汪蔚,博士,教授,研究方向为聚合物基复合材料 E-mail: zjxuwangwei@163.com

  • 中图分类号: TB332

Thermal conductivity and electrical properties of Al2O3-Sn57Bi43/epoxy composites

Funds: Zhejiang Province Public Welfare Technology Application Research Project (LGG19E030006)
  • 摘要: 在聚合物基体中构建由高导热填料相互连接而成的导热通路是提高复合材料导热性能的有效策略。本文采用共还原法,在Al2O3微球表面沉积低熔点纳米锡铋合金颗粒(Sn57Bi43),制备杂化材料(Al2O3-Sn57Bi43),用于环氧树脂的导热绝缘填料。当环氧树脂受热固化时,Al2O3-Sn57Bi43表面Sn57Bi43纳米颗粒熔融,将填料相互连接而形成有效的导热通路,提高复合体系导热性能。当填料体积含量为60vol%时,Al2O3-Sn57Bi43/环氧树脂复合材料的导热系数为2.95 W·(m·K)−1,比Al2O3/环氧树脂复合材料的导热系数(1.82 W·(m·K)−1)提高了62.1%。Fogyel及Agari模型分析表明,Al2O3表面沉积Sn57Bi43有利于降低填料间接触热阻,形成导热通路。与Al2O3/环氧树脂复合材料相比,Al2O3-Sn57Bi43/环氧树脂复合材料的介质损耗增加,介电强度及体积电阻率降低,但仍具有电绝缘性能。由于填料-基体间界面性能改善及Al2O3-Sn57Bi43形成的网链结构能起到传递应力,阻止裂纹扩张的作用,Al2O3-Sn57Bi43/环氧树脂复合材料的拉伸断裂强度提高。

     

  • 图  1  Al2O3-Sn57Bi43杂化材料及Al2O3-Sn57Bi43/环氧树脂复合材料的制备过程示意图

    Figure  1.  Schematic illustration of preparation for Al2O3-Sn57Bi43 hybrid fillers and Al2O3-Sn57Bi43/epoxy composites

    图  2  Al2O3和Al2O3-Sn57Bi43杂化材料的XPS全谱 (a) 和Sn3d (b)、Bi4f (c) 高分辨率窄谱

    Figure  2.  Survey XPS (a) and high resolution spectra of Sn3d (b), Bi4f (c) region of Al2O3 and Al2O3-Sn57Bi43 hybrid fillers

    图  3  Al2O3和Al2O3-Sn57Bi43的DSC曲线

    Figure  3.  DSC curves of Al2O3 and Al2O3-Sn57Bi43

    图  4  Al2O3 (a)、Al2O3-Sn57Bi43杂化材料 (b) 及经150℃/2 h处理后的Al2O3-Sn57Bi43杂化材料 (c) 的SEM图像

    Figure  4.  SEM images of Al2O3 (a), Al2O3-Sn57Bi43 hybrid fillers (b) and Al2O3-Sn57Bi43 after thermal treatment at 150℃ for 2 h (c)

    图  5  Al2O3/环氧树脂 (a) 及Al2O3-Sn57Bi43/环氧树脂 (b) 复合材料横截面的SEM图像

    Figure  5.  Cross section SEM images of Al2O3/epoxy (a) and Al2O3-Sn57Bi43/epoxy composites (b)

    图  6  填料体积含量对Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料导热系数的影响

    Figure  6.  Effects of filler volume fraction on thermal conductivity of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    图  7  Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料的lg(λ-λ1)-lg[(Vf-Vc)/(1-Vc)]曲线

    λ1 and λ2—Thermal conductivity of polymer and fillers respectively; Vf—Volume fraction of fillers; Vc—Critical volume fraction of fillers

    Figure  7.  lg(λ-λ1)-lg[(Vf-Vc)/(1-Vc)] curves of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    图  8  Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料的lgλ-Vf曲线

    Figure  8.  lgλ-Vf curves of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    表  1  Al2O3和Al2O3-Sn57Bi43的元素组成

    Table  1.   Element compositions of Al2O3 and Al2O3-Sn57Bi43 wt%

    SampleAlOSnBi
    Al2O350.7247.360.00 0.00
    Al2O3-Sn57Bi4340.2537.988.5111.38
    下载: 导出CSV

    表  2  Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料的密度、比热容及热扩散系数

    Table  2.   Density, specific heat capacity and thermal diffusion coefficient of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    Vf/%Al2O3/epoxyAl2O3-Sn57Bi43/epoxy
    Density/
    (kg·m−3)
    Specific heat
    capacity/[J·(kg·K)−1]
    Thermal diffusion
    coefficients/(m2·s−1)
    Density/
    (kg·m−3)
    Specific heat
    capacity/[J·(kg·K)−1]
    Thermal diffusion
    coefficients/(m2·s−1)
    0 1.19×103 1106.43 1.52×10−7 1.19×103 1106.43 1.52×10−7
    6 1.35×103 1045.03 1.42×10−7 1.38×103 1016.70 1.50×10−7
    11 1.49×103 1004.05 1.41×10−7 1.54×103 958.87 1.49×10−7
    14 1.57×103 982.84 1.43×10−7 1.63×103 929.55 1.51×10−7
    17 1.65×103 963.71 1.76×10−7 1.73×103 903.46 2.05×10−7
    22 1.78×103 935.68 2.46×10−7 1.89×103 865.83 3.12×10−7
    29 1.97×103 902.86 3.04×10−7 2.11×103 822.64 4.09×10−7
    38 2.21×103 868.87 4.94×10−7 2.39×103 778.87 7.77×10−7
    48 2.48×103 838.89 5.81×10−7 2.71×103 741.04 10.05×10−7
    55 2.67×103 821.50 7.48×10−7 2.93×103 719.42 12.90×10−7
    60 2.80×103 810.51 8.03×10−7 3.09×103 705.88 13.51×10−7
    下载: 导出CSV

    表  3  Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料导热系数的非线性Foygel模拟结果

    Table  3.   Simulation results of nonlinear Foygel model for the thermal conductivity of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    SampleVc/%λ0/(W·(m·K)−1)βRc/(K·W−1)
    Al2O319.233.421.0881.17×105
    Al2O3-Sn57Bi4318.256.731.2538.35×104
    Notes: Vc—Critical volume fraction of filler; λ0—Pre-exponential factor; β—Conductivity exponent that depends on the aspect of filler; Rc—Interface thermal resistance.
    下载: 导出CSV

    表  4  Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料导热系数的Agari模拟结果

    Table  4.   Agari simulation results for the thermal conductivity of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    SampleC1C2
    Al2O30.76610.8991
    Al2O3-Sn57Bi430.74951.1465
    Notes: C1—Factor affecting crystallinity and crystal size of polymer; C2—Factor of ease in forming conductive chains of fillers.
    下载: 导出CSV

    表  5  填料体积含量对Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料拉伸断裂强度的影响

    Table  5.   Effects of filler volume fraction on tensile properties of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    Vf/vol%Al2O3/epoxyAl2O3-Sn57Bi43/epoxy
    Tensile strength/MPaElongation at break/%Tensile strength/MPaElongation at break/%
    044.56±1.834.47±0.1744.56±1.834.47±0.17
    2040.31±1.204.06±0.1446.84±2.044.75±0.21
    4037.41±1.153.54±0.1549.65±2.165.09±0.19
    6032.28±1.093.21±0.1151.62±2.625.36±0.24
    下载: 导出CSV

    表  6  填料体积含量对Al2O3/环氧树脂和Al2O3-Sn57Bi43/环氧树脂复合材料电性能的影响

    Table  6.   Effects of filler volume fraction on electric properties of Al2O3/epoxy and Al2O3-Sn57Bi43/epoxy composites

    Vf/vol%Al2O3/epoxyAl2O3-Sn57Bi43/epoxy
    Volume resistivity/
    (1013 Ω·m)
    Dielectric strength/
    (MV·m−1)
    Dielectric loss tanδ/
    10−3
    Volume resistivity/
    (1013 Ω·m)
    Dielectric strength/
    (MV·m−1)
    Dielectric loss tanδ/
    10−3
    02.67±0.6825.8±1.64.75±0.082.670±0.68025.8±1.6 4.75±0.08
    202.79±0.5125.2±2.13.98±0.060.921±0.10622.1±1.411.02±0.22
    402.81±0.6224.5±1.95.22±0.070.264±0.09619.6±1.215.46±0.97
    602.87±0.7524.3±1.34.75±0.070.086±0.03418.5±1.319.43±1.46
    下载: 导出CSV
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  • 收稿日期:  2022-11-22
  • 修回日期:  2022-12-14
  • 录用日期:  2022-12-21
  • 网络出版日期:  2023-01-06
  • 刊出日期:  2023-11-01

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