Emissivity and catalycity measurements on SiC-coated carbon fibre reinforced silicon carbide composite
Emissivity and catalycity measurements on SiC-coated carbon fibre reinforced silicon carbide composite
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DOI：
10.1016/j.jeurceramsoc.2008.12.011
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发表时间：
2009-07
影响因子：
5.7
通讯作者：
D. Alfano;L. Scatteia;S. Cantoni;M. Balat-Pichelin
中科院分区：
文献类型：
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作者：
D. Alfano;L. Scatteia;S. Cantoni;M. Balat-Pichelin
在 600-1600°C 范围内，通过聚合物气相渗透制备碳纤维增强碳化硅复合材料，然后通过化学气相沉积涂覆 SiC，对与原子氧复合相关的发射率和催化效率进行了实验研究。所有测试样品均具有高发射率（1600°C 时约为 0.7）和低复合系数（1500°C 时平均为 0.07）。实验数据表明，表面光洁度仅对催化行为有显着影响：属于同一生产批次但表面形态略有不同的C/SiC样品，虽然表现出相同的催化趋势，但其特征在于重组系数绝对值的可检测差异。对测试后样品进行的微观结构研究表明形成了二氧化硅基玻璃层，并证实 C/SiC 的氧化位于主动和被动机制之间的边界线上。
The emissivity and the catalytic efficiency related to atomic oxygen recombination were experimentally investigated in the range 600–1600°C for a carbon fibre reinforced silicon carbide composite produced by polymer vapour infiltration and then coated with SiC by chemical vapour deposition. High emissivity (about 0.7 at 1600°C) and low recombination coefficients (on average 0.07 at 1500°C) were found for all the samples tested. The experimental data showed a marked effect of the surface finish on the catalytic behaviour only: C/SiC samples belonging to the same production batch but having slightly different surface morphology, while exhibiting the same catalycity trend, are characterized by detectable differences in absolute values of the recombination coefficient. Micro-structural investigations performed on post-test samples have shown the formation of a silica-based glassy layer and have confirmed that the oxidation of C/SiC lies on the boundary line between the active and passive mechanism.