Effect of Surface Oxidization on the Spectral Normal Emissivity of Aluminum 3A21 at the Wavelength of 1.5? 详细信息    查看全文

• 作者：Deheng Shi ; Fenghui Zou ; Shuai Wang ; Zunlue Zhu…
• 关键词：Aluminum 3A21 ; Heating time ; Oscillations ; Spectral emissivity ; Surface oxidization
• 刊名：International Journal of Thermophysics
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：36
• 期：4
• 页码：747-759
• 全文大小：388 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Mechanics
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-9567

文摘

This study explores the dependence of the spectral emissivity on the temperature ranging from 800?K to 910?K for an oxidizing surface of aluminum 3A21. In this experiment, the infrared radiation stemming from the specimen is received by an InGaAs photodiode detector, which operates at the wavelength of 1.5? \(\upmu \) m with a bandwidth of about 20?nm. The temperature of the specimen surface is determined by averaging the two R-type platinum–rhodium thermocouples, which are tightly welded on the specimen surface. The spectral emissivity is reported before the first measurement over the temperature range from 800?K to 910?K. The variation of the spectral emissivity with the heating time is evaluated at a given temperature. The variation of the spectral emissivity with temperature is discussed for a given heating time. Oscillations of the spectral emissivity have been observed, which are affirmed to be connected with the thickness of the oxidization layer on the specimen surface, and formed by the interference effect between the radiation coming from the oxidization layer and the radiation stemming from the substrate. The effect of surface oxidization on the spectral emissivity of aluminum 3A21 is evaluated, and compared with that of SPHC steel. Analytical expressions of the spectral emissivity of aluminum 3A21 versus the temperature are derived at some given heating times. A conclusion is obtained that the experimental results obtained at a given heating time from 800?K to 910?K abide by the same functional form.