Emissivity measurement of metallurgical materials.

热膨胀系数是分析高温过程的最基本的性质之一。然而，火法冶金领域的数据很少，因此数据的积累是必要的和重要的。由于发射率对样品的表面性质非常敏感，因此经常可以观察到实际值与引用的发射率光学常数有些不同。在本研究中，首先，1）设计了三套实验装置，分别用紫外-近红外光谱仪和红外光谱仪测量了可见光至红外波段的光谱发射率和总发射率。2)利用该装置，在可见光-红外波段测量了熔融Al、Ag、Au和固态Pt板的光谱发射率，并与实验结果进行了比较。 ...更多信息 3）测量了Pt板的总发射率随温度的变化。4)通过这些实验，证实了系统的可靠性。5)接着，作为在实际工艺中作为熔融炉渣层可满足的半透明样品的实例，测量了用熔融碳酸钠覆盖的石墨和银的发射率。（6）将这两个数据结合起来，导出了熔融碳酸钠的透过率。（7）研制了具有实际意义的粉末样品发射率测量装置。8)利用该装置在近红外波段测量了氧化铝和石墨粉的发射率。9)结果表明，粉末中孔隙的存在模糊了样品的整体性质，10）它们的发射率接近于1，与粉末的种类无关。目前，大部分的努力已被用于测量系统的开发，并将作为下一步测量以下系统：Cu和Fe及其合金，Cu亚光和Fe渣在固态和液态。少

Emissivity is a one of the most fundamental properties for the analysis of the high temperature processes. Nevertheless, there are little data available in the pyrometallurgical field, so the accumulation of the data is necessary and important. Because the emissivity is quite sensitive on a surface properties of sample, it can be frequently observed that the actual value which can be apllied is somewhat different from the emissivity cited as optical constant. Thus, it has been kept throughout the study that the experimental condition is set up as a simulated to practical one as possible, so long as the measuring condition can be described definitly.In this study, at first, 1) three experimental apparatus were developed to measure the spectral emissivity in visible to infrared region by two sets of systems using UV-NIR and IR spectrometer, and total emissivity. 2) By these apparatus, spectral emissivity of molten Al, Ag, and Au and solid Pt plate was measured through visible to ir regio … More n, and 3) total emissivity of Pt plate was measured as a function of temperature. 4) From these experiments, the reliability of the systems were confirmed. 5) Next, for an example of a semi-transparent sample which can be met in practical processes as molten slag layer, emissivities of graphite and silver covered with molten sodium carbonate were measured. And 6) transmissivity of molten sodium carbonate was derived by the combination of these two data.On the other hand, 7) measuring apparatus for the emissivity of powder sample which is practically important was developed. 8) Using this apparatus, emissivity of alumina and graphite powder were measrued in nir region. 9) Results showed the presence of void in powder smeared out the character of a bulk property of sample, and 10) their emissivities approached to unity irrespective of kinds of powder.Hitherto, most effort has been made to a development of measuring systems, and following systems will be measured as next step; Cu and Fe and their alloys, Cu matt and Fe slags in solid and liquid states. Less