Author
Kun Yu
Bio: Kun Yu is an academic researcher from Henan Normal University. The author has contributed to research in topics: Emissivity & Materials science. The author has an hindex of 6, co-authored 22 publications receiving 131 citations.
Topics: Emissivity, Materials science, Optics, Medicine, Optoelectronics
Papers
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TL;DR: In this article, the infrared normal spectral emissivity of an oxidized Ti-6Al-4V alloy has been measured during a thermal oxidation process, and the thickness values indicate that the oxide film growth follows parabolic law and that the growth rate increases rapidly above 923 K.
48 citations
TL;DR: In this paper, an experimental apparatus for normal spectral emissivity measurements at low temperatures was constructed by using the Fourier transform infrared (FTIR) spectrometer, which was calibrated against a high quality reference blackbody based on the multi-temperature method.
32 citations
TL;DR: In this article, the normal spectral emissivity of oxidized copper is measured by an experimental setup based on a Fourier transform infrared spectrometer (Bruker 70V) in the wavelength range of 3-20
23 citations
TL;DR: In this paper, an experimental apparatus for measurements of the emissivity of a metal at different temperatures at \(1.5\, \upmu \text{m }\) has been developed.
Abstract: In this article, an experimental apparatus for measurements of the emissivity of a metal at different temperatures at \(1.5\, \upmu \text{ m }\) has been developed. Using this apparatus, the emissivity of steel 201, 304, and 321 samples has been measured at different temperatures, and the effects of the temperature, composition, and heating time of steel samples on the emissivity are analyzed according to the measured data. The measured data could be fitted to the same exponential function with the linear least-squares technique, and the fitting accuracy reaches relatively high quality. The measurement uncertainty of this experimental apparatus is analyzed. The analyses show that the measured emissivity is reliable.
19 citations
TL;DR: In this paper, an experimental apparatus based on the improved measurement method is developed to realize precise emissivity determination of solid materials, which covers the spectral range between 5 and 20 µm and temperature region from 373 to 673 µm.
17 citations
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TL;DR: The temperature its measurement and control in science and industry volume 4 part 3 thermocouples biology and medicine geophysics and space is one book that the authors really recommend you to read, to get more solutions in solving this problem.
Abstract: (1963). Temperature, Its Measurement and Control in Science and Industry. International Journal of Radiation Biology and Related Studies in Physics, Chemistry and Medicine: Vol. 6, No. 6, pp. 610-610.
82 citations
TL;DR: In this paper, the authors highlight the corrosion resistance of the passive layers on biomedical Ti-6Al-4V and β-type Ti alloys in the human body environment by reviewing relevant literature research contributions.
Abstract: The high specific strength, good corrosion resistance, and great biocompatibility make titanium and its alloys the ideal materials for biomedical metallic implants. Ti-6Al-4V alloy is the most employed in practical biomedical applications because of the excellent combination of strength, fracture toughness, and corrosion resistance. However, recent studies have demonstrated some limits in biocompatibility due to the presence of toxic Al and V. Consequently, scientific literature has reported novel biomedical β-Ti alloys containing biocompatible β-stabilizers (such as Mo, Ta, and Zr) studying the possibility to obtain similar performances to the Ti-6Al-4V alloys. The aim of this review is to highlight the corrosion resistance of the passive layers on biomedical Ti-6Al-4V and β-type Ti alloys in the human body environment by reviewing relevant literature research contributions. The discussion is focused on all those factors that influence the performance of the passive layer at the surface of the alloy subjected to electrochemical corrosion, among which the alloy composition, the method selected to grow the oxide coating, and the physicochemical conditions of the body fluid are the most significant.
80 citations
TL;DR: In this article, the influence of temperature and time parameters on the process of growth, the thickness, mechanical properties and roughness of oxide layers obtained on titanium Grade 2, was investigated.
44 citations
40 citations
TL;DR: In this article, a magnetophotonic crystal was proposed to realize strong non-reciprocal radiation at small angles, and the numerical results showed that strong nonreciprocity can be obtained at angle of incidence of 30o, which is much smaller than the typical angle of 60°.
Abstract: Kirchhoff's law plays a vital role in radiation heat transfer, which has been recently generalized to hold for both reciprocal and nonreciprocal materials. However, the verification of the generalized Kirchhoff's law for nonreciprocal materials in experiment has not been reported. Previous proposed structures could only obtain strong nonreciprocal radiation at large angles, which were not favorable in experiment. Here, we proposed magnetophotonic crystal to realize strong nonreciprocal radiation at small angles. The numerical results show that strong nonreciprocal radiation can be obtained at angle of incidence of 30o, which is much smaller than the typical angle of 60°. The distribution of magnetic field is used to reveal the mechanism, and it indicates that the enhanced nonreciprocity is attributed to the excitation of Tamm plasmon polaritons. We believe such magnetophotonic crystal is promising in verifying the Kirchhoff's law for nonreciprocal materials.
36 citations