为了解决阻燃镁合金的关键参量燃点测试的难题, 采用比色测温法进行了理论分析和实验验证, 并设计了结构新颖的比色测温装置。提出了由测温装置接收光辐射能量的突变点判断镁合金何时起燃, 从而求出燃点温度; 由中温黑体炉对系统进行静态标定来获得静标系数; 而用电加热薄片电阻法来点燃镁合金, 具有操作简单、节省时间和实验原料的优点。通过对含Nd质量分数为0.0075的AZ80镁合金燃点进行了测试, 比色测温装置和红外测温仪的测量结果分别是1164.7K和1148.2K, 其相对误差为1.4%。结果表明, 比色测温法成功解决了镁合金燃点测试难的问题, 且对阻燃镁合金的相关研究及镁合金冶炼的在线监测具有较重要的参考价值。

To solve the measurement of ignition point, the key parameter of ignition-proof magnesium alloy, the colorimetric temperature measurement method was used for the theoretical analysis and experimental verification. A colorimetric temperature measurement device with new structure was designed. The time of the ignition of magnesium alloy was determined from the mutation point of optical radiant energy received by the temperature measurement device and then the ignition temperature was obtained. The static calibration coefficients were gotten from the static calibration of the moderate temperature blackbody furnace. Moderate temperature blackbody furnace was utilized to calibrate statically to obtain static calibration coefficient. Magnesium alloy was ignited with an electrical heating slice resistance with the advantages of simple operation, saving time and test materials. The results of the ignition test of AZ80 with Nd (mass fraction of 0.0075) by colorimetric temperature measurement device and infrared thermometer were 1164.7K and 1148.2K, respectively, whose relative error was 1.4%. The results show that this method solves the difficulty of testing the ignition point of magnesium alloy successfully and has very important reference value for the related research of flame retardant magnesium and on-line monitoring of magnesium alloy smelting.