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铸坯表面发射率是影响铸坯表面温度测量的一项重要的物理参数。利用辐射能比较测量发射率的方法,研制了一套高温铸坯发射率测量装置,其主要由加热系统、角度旋转系统、温度检测系统、真空控制系统以及背景辐射屏蔽系统等5部分组成。利用该装置测量了GCr15钢在不同角度、不同温度及不同氧化程度下的表面发射率。研究表明:角度增加对发射率的影响具有先增大后减小的变化规律;发射率会随着氧化程度的加深而变大,并且发射率极值点所对应的角度逐渐减小;随着温度的增加,发射率会随之增大,但是当温度超过1000℃后,其对发射率的影响较小。当温度为1000℃以上时,深度氧化的GCr15钢发射率的最大不确定度为0.0205。
Billet surface emissivity is an important physical parameter that affects the temperature measurement of slab surface. A set of high temperature billet emissivity measuring device was developed by using the method of measuring the emissivity of radiant energy. The emissivity measuring device mainly consists of heating system, angle rotating system, temperature detecting system, vacuum control system and background radiation shielding system. The apparatus was used to measure the surface emissivity of GCr15 steel at different angles, different temperatures and different degrees of oxidation. The results show that the influence of increasing angle on the emissivity increases first and then decreases, the emissivity increases with the deepening of the oxidation and the angle corresponding to the emissivity decreases gradually. With the increase of the angle, As the temperature increases, the emissivity increases, but when the temperature exceeds 1000 ° C, it has little effect on the emissivity. When the temperature is above 1000 ℃, the maximum uncertainty of the eroded GCr15 steel is 0.0205.