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制的发射率测量装置，利用椭偏仪和冷坩埚，确定固态和液态金属和合金的正常光谱发射率，并根据热辐射机制制定发射率的预测方程其取得的成果如下：(1)研究了纯Cu、Ag、Au、Fe、Co和Ni在固态和液态下的法向光谱发射率。在500-2500 nm波长范围内的熔点处测量，这表明发射率随着金属熔化而增加，针对高于1000 nm的波长范围内的发射率制定了预测方程。(2)正常光谱。在波长范围内的熔点处测量了 FZ-Si 和含有约 900 ppm Sb 杂质的废硅的发射率500-1000 nm，这表明：・固体硅的发射率大于液体硅的发射率。・ …更多固体硅具有正波长依赖性，而液体硅具有负波长依赖性。・添加约 900 ppm 的 Sb 不会影响发射率此外，固体硅的发射率使用约束电子模型描述，而液体硅的发射率使用带阻尼的自由电子模型描述。(3)正态在 800-2000 K 的温度范围内测量了固态和液态 Ni-Cu 二元合金的光谱发射率，这表明固态和液态的发射率都具有正温度系数，并且是 Ni 的二次函数浓度。・液体的发射率具有负波长依赖性。使用带阻尼的自由电子模型计算发射率可以很好地描述温度和成分依赖性，以及来自根据测量值和计算值之间的差异估算了 d 电子与发射率的关系，根据这些发现，制定了该合金系统发射率的预测方程。(4)Ni-Co 二元合金的正常光谱发射率。在 300-1600 K 的温度范围内测量了固态的 632.8 nm 波长，这表明发射率随着温度升高而降低，直至居里点，高于居里点(5)在1600-2000 K的温度范围内测量了液态Ni-Cr二元合金的正常光谱发射率，这表明：·液体的发射率具有正温度依赖性和负波长依赖性，与 Ni-Cu 合金类似。・与 Ni-Cu 合金不同，成分依赖性不能用 Ni 浓度的二次函数来表达，特别是在较低波长下。