Author(s): ZHANG Kaihua, YU Kun, LIU Yufang, WANG Wenbao, College of Physics & Electronic Engineering, Henan Normal University, Department of Physics, Xingyi Normal University for Nationalities
Pages: 36-40
Year: 2014 Issue:  1
Journal: Journal of Henan Normal University(Natural Science Edition)
Keyword:  Al5052; spectral emissivity; temperature; heating time;
Abstract: A reflective spectral emissivity measurement apparatus was designed based on the Kirchhoff’s law by using the GaAs semiconductor laser as the standard radiation source.The spectral emissivity of aluminum alloys AL5052was measured by using this apparatus with the temperatures range from 300up to 873K.The determined data showed an increasing emissivity.This trend was approximated by a linear least-squares fit yielding.Setting the spectral emissivity measurement apparatus at four given temperatures(673K,773K,823K,873K)for 5h,the result showed the spectral emissivity of aluminum alloys AL5052was very stable below 823K,and it did not change with time;However it increased due to the growing oxide layer with time above 823Kand tended to be stable after 2h.