CVI SiC涂层对碳泡沫性能影响
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Influence of CVI-SiC Coating on Properties of Carbon Foam
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    摘要:

    通过化学气相沉积法在柔性碳泡沫骨架上沉积生长碳化硅涂层,研究碳化硅涂层对泡沫材料的力学性能以及隔热性能的影响。利用SEM、XRD、压汞仪、电子万能试验机及导热分析仪分别对碳泡沫复合碳化硅涂层前后的微观形貌、物相组成、孔隙结构、抗压强度及导热系数进行测试。结果表明,碳泡沫骨架表面生长β-碳化硅涂层,随着碳化硅厚度增大:三维泡沫骨架结构存在的孔隙尺寸减小,孔隙率从99.68%下降至58.39%;泡沫试样压缩特性由类弹性形变转变为塑性形变,压缩强度从0.02 MPa增至3.14MPa;单位热量传递截面积增大,传热量增大,试样导热系数从0.026 W/(m·K)升高至0.101 W/(m·K)。

    Abstract:

    SiC coating grows in the flexible carbon foam via chemical vapor deposition (CVI) to investigate the effect of CVI-SiC on mechanical properties and thermal insulation performance of reinforced foam. The microstructure morphology and phase composition of the carbon foam and the reinforce foams are analyzed by SEM and XRD, respectively. The pore structure and thermal conductivity of the carbon foam and the reinforce foams are measured by mercury intrusion porosimetry and heat flow tester, respectively. The compression strength of the reinforce foams is measured by universal tester. The results show that the β-SiC coating grows uniformly on the carbon foam surface and the surface morphology of SiC coating depends on the surface morphology of matrix. When the thickness of SiC coating increases, pore size in the 3D interconnected network structure decreases, and the porosity decreases from 99.68% to 58.39%; the compression feature of reinforced foams changes from elastic deformation to plastic deformation, and the compression strength increases from 0.02 MPa to 3.14 MPa; the heat transfer area increases,and the thermal conductivity of foam samples increases from 0.026 W/(m·K) to 0.101 W/(m·K).

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余盛杰陈照峰陶华汪洋潘影廖家豪. CVI SiC涂层对碳泡沫性能影响[J].南京航空航天大学学报,2017,49(6):865-871

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  • 在线发布日期: 2018-01-09
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