A few days ago, China's first set of gas-controlled sodium heat pipe system with independent intellectual property rights was successfully developed in the Chinese Academy of Metrology, and passed the expert identification organized by the AQSIQ. This indicates that China has mastered the key technology for the development of gas-controlled sodium heat pipes.
Air control heat pipe technology is currently mainly used in the accurate control of the internal temperature of space vehicles such as space stations and space shuttles, and the high-precision temperature reproduction in the field of temperature measurement. Air-controlled sodium heat pipes can provide a uniform and stable temperature environment at 600 ℃ ~ 1000 ℃, used to calibrate high-temperature platinum resistance thermometers and thermocouples in the field of temperature measurement, study the non-uniqueness and non-uniformity of the ITS-90 international temperature scale, and The adiabatic heat method reproduces the silver and aluminum freezing points of the ITS-90 international temperature scale, which significantly improves the reproducibility level of the fixed point.
Currently, only Italy, France and Canada have carried out research in this area. In 2007, the Chinese Academy of Metrology carried out research on gas-controlled sodium heat pipes, and independently established China's first gas-controlled sodium heat pipe system with independent intellectual property rights. The research on gas-controlled sodium heat pipes has also made breakthrough progress.
According to Yan Xiaoke, the project leader and associate researcher of the Chinese Academy of Metrology, the current international control scheme is "combination of pressure control and power", and the research group proposed a new control of "combination of high-precision pressure control and temperature control." The strategy realizes the highly accurate temperature reproduction of the gas-controlled sodium heat pipe, and can significantly improve the temperature uniformity and stability technical indicators of the gas-controlled sodium heat pipe.
Under the dynamic pressure control of 111250Pa, the uniformity and stability of the vertical temperature field in the gas-controlled sodium heat pipe thermometer well are ± 0.16mK and ± 0.21mK, respectively, and the technical indicators have reached the international leading level. The highest level of technical uniformity and stability of the gas-controlled sodium heat pipe published internationally before was ± 0.5mK of the Italian Metrology Institute.
The use of gas-controlled sodium heat pipes to carry out advanced research on the quasi-adiabatic method to reproduce the ITS-90 international temperature scale silver and aluminum freezing point can further improve the reproducibility level of China's ITS-90 international temperature scale and ensure the international equivalence of temperature values ​​and domestic temperatures Accurate delivery of value.
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