钴和镍光谱发射率特性研究
发布时间:2018-04-29 17:42
本文选题:光谱发射率 + 傅里叶红外光谱仪 ; 参考:《河南师范大学》2017年硕士论文
【摘要】:光谱发射率是一项重要的热物理参数,在诸多领域中发挥着越来越重要的作用。随着科学技术的快速发展,对材料发射率的精确测量提出了更高的要求,因此,研究材料的光谱发射率对推动多个行业的发展具有重要的实用价值和科研意义。文章第一章介绍了光谱发射率的分类及其基本测量方法,对金属光谱发射率的研究意义及现状进行了简要总结。并对现阶段发射率测量技术存在的问题进行了概述。文章第二章分析了温度、波长、表面条件以及测量环境等因素对金属光谱发射率测量的影响,并简要介绍了红外辐射相关基本理论。文章第三章介绍了基于傅里叶变换红外光谱仪的发射率测量装置,并对装置的加热系统、黑体炉、傅里叶变换红外光谱仪、光学系统四个部分进行了描述。该套装置的测量温度范围为300-1273K,波长范围为8-15μm,并可以通过更换相关的设备仪器进行拓展。文章第四章利用实验室发射率测量装置探究金属镍的光谱发射率特性。得出以下结论:在氩气保护下,金属镍的光谱发射率在8-10μm范围内随着波长的增大而增大,在10-15μm范围内随着波长的增大而减小;在500-680K温度范围内,镍的光谱发射率随温度变化速率较大,从680K开始,镍的光谱发射率随温度变化速率降低,发射率随温度缓慢增大,当温度高于973K时,发射率随温度变化速率趋近为零;金属镍的光谱发射率随粗糙度的增大而增大,不过粗糙度对于金属镍的光谱发射率的影响较为复杂,并非线性关系。镍的表面形成氧化膜后,其光谱发射率数值明显增加,可见镍的氧化物的发射率数值要远远高于纯镍,除此之外,辐射能量在氧化膜表面发生的干涉效应也会对发射率数值产生影响。文章第五章系统性研究了钴的发射率特性。金属钴和镍同属一族,性质相近,都具有铁磁性。实验结果表明:金属钴的光谱发射率在8-10μm范围内出现波峰波谷,在10-15μm范围内随着波长的增大而减小;钴的光谱发射率对于温度的变化响应灵敏,在其他条件相同的情况下,发射率和温度呈正比关系;金属钴表面粗糙程度越大,其光谱发射率数值也越大;在金属钴表面发生氧化的过程中,其光谱发射率变化较为复杂:当氧化时间低于90分钟时,发射率曲线震荡明显;当氧化时间超过90分钟后,光谱发射率曲线趋于稳定。这种现象与钴的氧化物种类有关。
[Abstract]:Spectral emissivity is an important thermophysical parameter and plays a more and more important role in many fields. With the rapid development of science and technology, the accurate measurement of emissivity of materials is required. Therefore, the study of spectral emissivity of materials has important practical value and scientific significance to promote the development of many industries. In the first chapter, the classification of spectral emissivity and its basic measurement methods are introduced, and the significance and present situation of metal spectral emissivity are summarized briefly. The problems of emissivity measurement are summarized. In the second chapter, the influence of temperature, wavelength, surface conditions and measuring environment on the measurement of metal spectral emissivity is analyzed, and the basic theory of infrared radiation is briefly introduced. In the third chapter, the emissivity measurement device based on Fourier transform infrared spectrometer is introduced. The heating system, blackbody furnace, Fourier transform infrared spectrometer and optical system are described. The measuring temperature range of the device is 300-1273K and the wavelength range is 8-15 渭 m, which can be extended by replacing the related equipment. In chapter 4, the spectral emissivity characteristics of nickel metal are investigated by means of laboratory emissivity measurement device. The following conclusions are drawn: the spectral emissivity of nickel increases with the increase of wavelength in the range of 8-10 渭 m and decreases with the increase of wavelength in the range of 10-15 渭 m, and in the temperature range of 500-680K under argon protection, the emissivity of nickel increases with the increase of wavelength in the range of 8-10 渭 m, and decreases with the increase of wavelength in the range of 10-15 渭 m. The spectral emissivity of nickel decreases with temperature from 680K, and increases slowly with temperature. When temperature is higher than 973 K, the emissivity tends to zero with temperature. The spectral emissivity of nickel increases with the increase of roughness, but the effect of roughness on the spectral emissivity of nickel is complex and not linear. After the formation of oxide film on the surface of nickel, its spectral emissivity increases obviously, and the emissivity of nickel oxide is much higher than that of pure nickel. The interference effect of radiation energy on the surface of oxide film will also affect the emissivity. In chapter 5, the emissivity of cobalt is studied systematically. Cobalt and nickel belong to the same family, similar properties, both have ferromagnetism. The experimental results show that the spectral emissivity of cobalt appears in the range of 8-10 渭 m, and decreases with the increase of wavelength in the range of 10-15 渭 m, and the spectral emissivity of cobalt is sensitive to the change of temperature. The higher the roughness of cobalt surface, the greater the value of spectral emissivity. In the oxidation process of cobalt metal surface, the variation of spectral emissivity is more complex: when the oxidation time is less than 90 minutes, The emissivity curve oscillates obviously, and when the oxidation time exceeds 90 minutes, the spectral emissivity curve tends to be stable. This phenomenon is related to the species of cobalt oxides.
【学位授予单位】:河南师范大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TG146.1
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