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An Estimate of the Temperature of Semitransparent Oxide Particles in Thermal Spraying

机译：热喷涂中半透明氧化物颗粒温度的估算

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摘要

A considerable temperature difference in semitransparent oxide particles due to intensive heating in plasma spraying makes it difficult to interpret the optical measurements of their temperature. The problem of determining the bulk temperature of such particles from the experimental data on the color temperature is analyzed by using a recently proposed approximate model for the radiation transfer inside a nonisothermal refracting spherical particle. The same approximation is also employed for developing an improved model of particle heating, taking into account the radiation―conduction interaction inside the particle. Calculations for Al_2O_3 and ZrO_2 particles in a typical plasma jet show that the color temperature of oxide particles may be less than or greater than their bulk temperature, depending on the spectral absorption coefficient of particle substance. This temperature difference during the melting of particles may reach the value of 200―300 K. A procedure for in situ evaluation of the absorption coefficient by comparison of color and brightness temperatures of molten particles is proposed.
机译：由于等离子喷涂中的强力加热，半透明氧化物颗粒中存在相当大的温度差，因此很难解释其温度的光学测量结果。通过使用最近提出的非等温折射球形颗粒内部辐射传输的近似模型，分析了根据色温的实验数据确定此类颗粒的体温的问题。考虑到粒子内部的辐射-传导相互作用，同样的近似方法也可用于开发改进的粒子加热模型。在典型的等离子流中对Al_2O_3和ZrO_2粒子的计算表明，取决于粒子物质的光谱吸收系数，氧化物粒子的色温可能小于或大于其体温。颗粒熔化过程中的温度差可能达到200-300K。建议通过比较熔融颗粒的色温和亮温来原位评估吸收系数的程序。

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