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Spectral Emissivity and Its Prediction Models for Metals and Alloys in Solid and Liquid States

固态和液态金属和合金的光谱发射率及其预测模型

基本信息

批准号：
14350396
负责人：
SUSA Masahiro
金额：
$ 9.66万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350396/
关键词：
Normal spectral emissivity Noble metals Transition metals Silicon Ni-based alloys Ellipsometer for high temperature use Cold crucible Prediction equation Ni合金エリプソメータ自由電子モデル d電子融解合金 Hagen-Rubensの関係バンド間遷移銅合金溶融合金束縛電子モ

项目摘要

The aims of the present work are to determine normal spectral emissivities for metals and alloys in solid and liquid states using self-produced emissivity measurement apparatuses utilizing an ellipsometer and a cold crucible and to formulate prediction equations for the emissivities on the basis of thermal radiation mechanisms, the achievements for which are itemized as follows :(1)Normal spectral emissivities for pure Cu,Ag,Au,Fe,Co and Ni in solid and liquid states have been measured at the melting points over the wavelength range 500-2500 nm, which has indicated that the emissivities increase on melting of the metals. The prediction equation has been formulated for the emissivities in the wavelength range higher then 1000 nm.(2)Normal spectral emissivities for FZ-Si and pot scrap Si containing about 900 ppm Sb as impurity have been measured at the melting points over the wavelength range 500-1000 nm, which has indicated :・The emissivity of solid Si is larger than that of liquid Si.・ … More Solid Si has positive wavelength dependence but liquid Si has negative.・Additions of Sb of about 900 ppm does not affect emissivity values of Si in both solid and liquid states.In addition, the emissivity of solid silicon has been described using the restrained electron model, whereas that of liquid silicon using the free electron model with damping.(3)Normal spectral emissivities for Ni-Cu binary alloys in solid and liquid states have been measured over the temperature range 800-2000 K, which has indicated・The emissivities for both the solid and the liquid have positive temperature coefficients and are on quadratic functions of the Ni concentration.・The emissivity for the liquid has negative wavelength dependence.Calculation of emissivity using the free electron model with damping could well have described the temperature and compositional dependencies, and contribution from d-electrons to the emissivity has been estimated from the difference between the measured and calculated values. From these findings, the prediction equation has been formulated for the emissivity of this alloy system.(4)Normal spectral emissivities for Ni-Co binary alloys in solid state have been measured for a wavelength of 632.8 nm over the temperature range 300-1600 K, which has indicated that the emissivities decrease with increasing temperature up to the Curie points, above which the emissivities increase.(5)Normal spectral emissivities for Ni-Cr binary alloys in liquid state have been measured over the temperature range 1600-2000 K, which has indicated :・The emissivities for the liquid have positive temperature dependence and negative wavelength dependence, similarly to Ni-Cu alloys.・The compositional dependence can not be expressed by quadratic functions of the Ni concentration, especially at lower wavelengths, differently from Ni-Cu alloys. Less

本工作的目的是利用自行研制的椭偏仪和冷坩埚发射率测量装置，测定金属和合金在固态和液态下的法向光谱发射率，并根据热辐射机理建立发射率的预测方程。（1）纯Cu、Ag、Au、Fe的正常光谱发射率，在500-2500 nm波长范围内的熔点处测量了固态和液态的Co和Ni，这表明金属熔化时发射率增加。已针对高于1000 nm的波长范围内的发射率制定了预测方程。（2）在500-1000 nm波长范围内，测量了FZ-Si和含Sb约900 ppm的坩埚废料Si在熔点处的法向光谱发射率，结果表明：固态Si的发射率大于液态Si。 ...更多信息固态硅具有正的波长依赖性，而液态硅具有负的波长依赖性。·添加约900 ppm的Sb对固态和液态Si的发射率值没有影响，另外，固态Si的发射率用受约束电子模型描述，液态Si的发射率用有阻尼的自由电子模型描述。（3）在800-2000 K温度范围内，测量了Ni-Cu二元合金在固态和液态下的法向光谱发射率，结果表明：·固态和液态的发射率都具有正的温度系数，并且是Ni浓度的二次函数。液体的发射率具有负的波长依赖性，使用自由电子模型与阻尼的发射率的计算可以很好地描述的温度和组成的依赖性，并从测量值和计算值之间的差异估计的d-电子的发射率的贡献。从这些发现，预测方程已经制定了该合金系统的发射率。（4）在300-1600 K温度范围内，测量了Ni-Co二元合金在632.8nm波长处的光谱发射率。结果表明，在居里温度以下，发射率随温度的升高而降低，居里温度以上，发射率随温度的升高而升高。（5）在1600-2000 K温度范围内测量了液态Ni-Cr二元合金的法向光谱发射率，结果表明：与Ni-Cu合金一样，液态Ni-Cr合金的发射率具有正的温度依赖性和负的波长依赖性。与Ni-Cu合金不同，在较低的波长下，组分依赖性不能用Ni浓度的二次函数表示。少