空气中Al6061氧化过程红外发射率特性研究

基于自主搭建的材料光谱发射率测量装置,分别对铝合金6061在5个温度点(623K、673K、723K、773K、823K)测量氧化前后的发射率,分析了温度、波长、氧化时间、粗糙度对铝合金样品发射率的影响.实验结果表明:铝合金6061的发射率随波长的增加而降低,随温度的升高而增大,温度对发射率的影响程度在不同波长下是不同的.表面氧化会增加样品表面的粗糙度,从而造成发射率数值增加,氧化效应对发射率的影响程度在不同温度、波长下是不同的,氧化效应可使发射率最大增加0.05(723K时).温度为823K时,发射率随氧化时间的变化可用抛物线模型很好地拟合.

Investigation on infrared emissivity characteristics of aluminum alloy 6061 oxidation process in air

Based on the self-build spectral emissivity measurement device,the spectral emissivity of aluminum alloy 6061 before and after oxidation was measured at five temperatures(623 K,673 K,723 K,773 K,823 K),and the influence of temperature,wavelength,oxidation time and roughness on the emissivity of the samples was analyzed.The experimental results show that the emissivity of aluminum alloy 6061 decreases with the increasing of wavelength and increases as temperature rises,the influence of temperature on emissivity varies at different wavelengths.The surface oxidation will increase the roughness of the sample surface,resulting in the increase of emissivity value.The degree of oxidation effect on emissivity is different at different temperature and wavelength.The oxidation effect can increase the emissivity maximal by 0.05(723 K).The change of emissivity with oxidation time can be well fitted by parabolic model when the temperature is 823 K.