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取向碳化硅晶须硅橡胶复合材料导热性及绝缘性

于天骄 宋伟 冯景涛 彭修峰 宋文宏

于天骄, 宋伟, 冯景涛, 等. 取向碳化硅晶须硅橡胶复合材料导热性及绝缘性[J]. 复合材料学报, 2024, 41(1): 134-143. doi: 10.13801/j.cnki.fhclxb.20230404.002
引用本文: 于天骄, 宋伟, 冯景涛, 等. 取向碳化硅晶须硅橡胶复合材料导热性及绝缘性[J]. 复合材料学报, 2024, 41(1): 134-143. doi: 10.13801/j.cnki.fhclxb.20230404.002
YU Tianjiao, SONG Wei, FENG Jingtao, et al. Research on thermal conductivity and insulation of oriented silicon carbide whisker silicone rubber composites[J]. Acta Materiae Compositae Sinica, 2024, 41(1): 134-143. doi: 10.13801/j.cnki.fhclxb.20230404.002
Citation: YU Tianjiao, SONG Wei, FENG Jingtao, et al. Research on thermal conductivity and insulation of oriented silicon carbide whisker silicone rubber composites[J]. Acta Materiae Compositae Sinica, 2024, 41(1): 134-143. doi: 10.13801/j.cnki.fhclxb.20230404.002

取向碳化硅晶须硅橡胶复合材料导热性及绝缘性

doi: 10.13801/j.cnki.fhclxb.20230404.002
基金项目: 国家自然科学基金(51541702;51607048)
详细信息
    通讯作者:

    宋伟,博士,教授,博士生导师,研究方向为导热复合材料研发及绝缘材料改性研究 E-mail: sw7912@hrbust.edu.cn

  • 中图分类号: TM211;TB333

Research on thermal conductivity and insulation of oriented silicon carbide whisker silicone rubber composites

Funds: National Natural Science Foundation of China (51541702; 51607048)
  • 摘要: 随着电子产品的集成密度和功率密度不断增加,优化热界面材料变的尤为重要。本文以一维碳化硅晶须(SiCw)为填料,硅橡胶为基体制备出导热硅橡胶复合材料,综合分析了复合材料的微观形貌、物相结构、导热性及绝缘性。首先通过共沉淀法制备出Fe3O4对SiCw包覆的改性材料,其次将包覆Fe3O4的SiCw在液体硅橡胶基体中分散均匀,最后将其置于恒稳磁场中完成晶须取向及基体固化。结果表明:SiCw晶须表面包覆一层Fe3O4纳米颗粒且在硅橡胶基体中呈现取向排列,制备出SiCw取向结构的硅橡胶复合材料。当取向SiCw含量达到10wt%时,相比于纯硅橡胶导热系数可提升72%,比未取向10wt%SiCw填充的高40%。相比于纯硅橡胶体积电阻率下降两个数量级,但仍然具有良好的绝缘性。通过COMSOL对SiCw随机分散与取向排列的硅橡胶复合材料进行模拟仿真,仿真结果表明,含量10wt%的SiCw可使硅橡胶导热系数提升60%,体积电阻率在1015 Ω∙cm以上,而10wt%取向SiCw可使硅橡胶导热系数提升170%,体积电阻率在1014 Ω∙cm以上,与实验结果的趋势相一致。

     

  • 图  1  Fe3O4包覆碳化硅晶须(SiCw)的制备流程

    Figure  1.  Preparation process of Fe3O4 coated SiC whisker (SiCw)

    图  2  硅橡胶复合材料制备流程

    Figure  2.  Preparation process of silicone rubber composites

    图  3  XRD测试示意图

    Figure  3.  Schematic diagram of XRD test

    图  4  SiCw及FE@SIC的SEM图像

    Figure  4.  SEM images of SiCw and FE@SIC

    图  5  硅橡胶(SR)试样断面SEM图像

    Figure  5.  SEM images of silicone rubber (SR) section

    图  6  Fe3O4及FE@SIC的XRD图谱

    Figure  6.  XRD patterns of Fe3O4 and FE@SIC

    图  7  SR、SIC10、SICFE10*、FE@SIC10、FE@SIC10*的XRD图谱

    Figure  7.  XRD patterns of SR, SIC10, SICFE10*, FE@SIC10, FE@SIC10*

    图  8  SiCw/SR导热系数对数值线性拟合图

    Figure  8.  Linear fitting diagram of SiCw/SR thermal conductivity versus numerical value

    图  9  导热模型与SiCw/SR的导热系数折线图

    Figure  9.  Thermal conductivity model and thermal conductivity line chart of SiCw/SR

    图  10  SIC10、FE@SIC10*截面模拟图

    Figure  10.  Simulation diagram of SIC10, FE@SIC10* section

    图  11  FE@SIC10*与SIC10的几何仿真模型

    Figure  11.  Geometric simulation model diagram of FE@SIC10* and SIC10

    图  12  FE@SIC10*和SIC10几何模型在热场下的温度分布

    Figure  12.  Temperature distribution of geometric model of FE@SIC10* and SIC10 under thermal field

    表  1  仿真与实验数据对比表

    Table  1.   The comparison table of simulation results and experimental data

    Experimental dataSimulation results
    Name of sampleSIC10SIC10@FE10*SIC10SIC10@FE10*
    Thermal conductivity/(W/(m·K))0.1670.2350.2210.374
    Volume resistivity/Ω·cm3.71×10158.11×10144×10151×1014
    下载: 导出CSV

    表  1  试样编号明细表

    Table  1.   Specimen details

    Name of sampleDetailed description
    FE@SICFe3O4 coated SiCw
    SRPure silicone rubber sample
    SiCw/SRSiCw filled silicone rubber series samples
    SIC1010wt% SiCw filled silicone rubber sample
    FE@SIC10*Magnetized sample of 10wt%FE@SIC
    silicone rubber
    FE@SIC1010wt%FE@SIC silicone rubber sample
    SICFE10*Magnetized sample of 10wt%SiCw+Fe3O4
    silicone rubber
    下载: 导出CSV

    表  2  SiCw/SR的导热系数

    Table  2.   Thermal conductivity of SiCw/SR

    SiCw/SR/wt% Thermal conductivity/(W·(m·K)−1)
    0 0.137
    5 0.148
    10 0.167
    15 0.181
    20 0.236
    下载: 导出CSV

    表  3  FE@SIC10*导热系数对比表

    Table  3.   Comparison table of thermal conductivity of FE@SIC10*

    Name of sample Thermal conductivity/(W·(m·K)−1)
    SR 0.137
    SIC10 0.167
    SICFE10* 0.172
    FE@SIC10 0.168
    FE@SIC10* 0.235
    下载: 导出CSV

    表  4  SiCw/SR体积电阻率

    Table  4.   Volume resistivity of SiCw/SR

    SiCw/SR/wt% Volume resistivity/(Ω·cm)
    0 4.00×1016
    5 7.84×1015
    10 3.70×1015
    15 5.60×1014
    20 3.90×1014
    下载: 导出CSV

    表  5  FE@SIC10*体积电阻率对比

    Table  5.   Comparison of volume resistivity of FE@SIC10*

    Name of sample Volume resistivity/(Ω·cm)
    SR 4.0×1016
    SIC10 3.7×1015
    FE@SIC10* 8.1×1014
    下载: 导出CSV

    表  6  试样性能的仿真与实验数据对比

    Table  6.   Comparison of simulation results and experimental data of sample properties

    Sample Thermal conductivity/(W·(m·K)−1) Volume resistivity/(Ω·cm)
    Experimental
    data
    Simulation
    results
    Experimental
    data
    Simulation
    results
    SIC10 0.167 0.221 3.70×1015 4.00×1015
    SIC10@
    FE10*
    0.235 0.374 8.11×1014 1.00×1014
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-02-27
  • 修回日期:  2023-03-20
  • 录用日期:  2023-03-27
  • 网络出版日期:  2023-04-06
  • 刊出日期:  2024-01-01

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