Influence of surface oxidation on the radiative properties of ZrB 2 -SiC composites
Influence of surface oxidation on the radiative properties of ZrB 2 -SiC composites
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DOI：
10.1016/j.apsusc.2017.02.266
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发表时间：
2017-07
影响因子：
6.7
通讯作者：
L. Ning;Pifeng Xing;Lili Cui;Peng Wang;X. Jin;Xinghong Zhang
中科院分区：
文献类型：
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作者：
L. Ning;Pifeng Xing;Lili Cui;Peng Wang;X. Jin;Xinghong Zhang
ZrB 2 -20 vol. %的光谱发射率用红外光谱仪在2.5 ~ 25.0 μm波长范围内测量了ZrB_2/SiC（ZrB_1）、富硅玻璃（ZrB_2）和多孔氧化锆（ZrB_3）等不同表面成分的SiC复合材料的红外光谱。系统研究了ZrB 2-SiC复合材料表面氧化（与表面成分、氧化膜厚度、测试温度以及粗糙度有关）与辐射性能的关系。表面组分对复合材料的辐射性能有显著影响。在300-900 °C温度范围内，随表面氧化的进行，样品的总发射率从0.22变化到0.81。在相同的测试条件下，BZ 2的发射率约为BZ 3的1.5倍。试样表面氧化膜的存在增强了试样的辐射性能，特别是在短波波段，在一定范围内，随着氧化膜厚度的增加，长波波段的发射率逐渐增大。研究了测试温度和表面粗糙度对测试结果的影响。测试温度对材料的辐射性能影响不大，而表面粗糙度的影响可以忽略不计。
The spectral emissivities of ZrB2-20 vol.% SiC composites with various surface components of ZrB2/SiC (ZS1), silica-rich glass (ZS2) and porous zirconia (ZS3) were measured using infrared spectrometer in the wavelength range from 2.5 to 25.0 μm. The relationship between surface oxidation (associated with surface component, thickness of oxide scale, testing temperature as well as roughness) and the radiative properties of ZrB2-SiC composites were investigated systematically. Surface component affected the radiative properties of composites significantly. The total emissivity of ZS1 varied from 0.22 to 0.81 accompanied with surface oxidation in the temperature range 300–900 °C. The emissivity of ZS2 was about 1.5 times as that of ZS3 under the same testing conditions. The oxide scale on specimen surface enhanced the radiative properties especially in terms of short-wave range, and the emissivity in the long-wave range gradually increased with the thickness of oxide scale within a certain range. The influence of testing temperature and surface roughness was also investigated. The testing temperature had a little effect on radiative properties, whereas effect of surface roughness could be negligible.