液态金属钠是快中子增殖堆的良好载热剂。为研究钠的传热规律需要准确测量释热元件的表面温度。为了不破坏流场,将直径 0.3mm的NiCr-NiAl铠装热电偶埋设在释热元件包壳内,并采用电镀工艺加以固定。切片分析表明,热电偶与包壳接触良好。试验前在纳回路上对热电偶进行现场标定。在200—300℃范围内,标定误差为0.2℃。 Liquid metal sodium is a good heat carrier for fast breeder reactors. In order to study the heat transfer law of sodium, it is necessary to accurately measure the surface temperature of the heat-releasing component. In order not to damage the flow field, a NiCr-NiAl thermocouple with a diameter of 0.3mm is embedded in the cladding of the heat releasing element and fixed by an electroplating process. Slice analysis showed that the thermocouple and the cladding in good contact. Thermocouples were field calibrated on the nanowire before the test. In the 200-300 ℃ range, the calibration error is 0.2 ℃.