China Satellite Navigation System Management Office announced at the press conference of the State Council Information Office that the Beidou III basic system was completed to provide global services, which marked that the Beidou system has officially moved from the region to the world. Pakistan ’s transportation and port management, Indonesia ’s land planning, coastline mapping, China-Russia agricultural automation … From glorious Asia-Pacific to embracing the world, Beidou shares the Chinese “miracle” with the world.
Since the launch of the Beidou III double star in November last year, with 19 stars a year, the Beidou III system has once again refreshed the record of constellation deployment with amazing speed. In this series of satellite launches, the scientific research team of Professor Li Chengming from the Institute of Advanced Materials Technology of the University of Science and Technology Beijing has made a special contribution, which has made a new breakthrough in the cooling of Chinese spacecraft.
In view of the rapid development of electronic devices, the heat flux density of high-energy power components of new generation navigation satellites and manned spacecraft is extremely high, which can almost reach or exceed 500W / cm2. At the same time, due to the influence of space environment, the requirements of thermal control components are small and light, which makes the traditional The heat exchange method is difficult to balance the two key requirements of small size and fast heat dissipation. Then it is very likely that the failure of the electronic device integrated system due to insufficient heat dissipation will result in the destruction of the device. In order to solve the heat dissipation problem of ultra-high heat flux density components in the aerospace field, the diamond film heat expansion sheet developed by Professor Li Chengming's team at the University of Science and Technology of Beijing has entered space as the core thermal management element of the Beidou navigation satellite phased array component. It is currently operating in orbit and performing well . In the BeiDou-3 system, a total of 3 navigation satellites mounted this thermal control element to the sky.
Time is tight, the task is heavy, and the risk is high. In order to complete this task of heat dissipation for ultra-high heat flux density devices, Professor Li Chengming's team is under great pressure and has worked hard. In February 2016, it passed the review of diamond film as a network star high thermal conductivity device. It took a year and a half and delivered hundreds of qualified samples. In order to ensure product quality, the team continuously adjusted and improved in the process of production technology, product processing, surface modification, etc. In the end, with the concerted cooperation of the team and unshakeable confidence and determination, the team successfully completed this task for the Chinese aerospace industry. Provides an optimal solution for heat dissipation with extremely high heat flux density!
This research result has significant advantages compared with traditional heat sink materials: the extremely high thermal conductivity of diamond reduces the temperature of components quickly; the temperature gradient between TR modules is significantly reduced to achieve isothermalization; the long-term working temperature is high and the thermal control is improved Component life; significantly reduce the weight of thermal control components, while having high thermal conductivity and weight advantages.
Professor Li Chengming's team has an important influence in the field of diamonds at home and abroad. For many years, he has been aiming at the forefront of the development of the diamond field and has achieved close integration with major national needs. He is a fruitful scientific research team.
In the field of national defense equipment, the diamond microchannel radiator developed by the team has been successfully applied in the multi-purpose spacecraft return cabin of the Long March VII carrier rocket on June 26, 2016. Combining the extremely high thermal conductivity of diamond with the advantages of increasing the heat transfer area of microchannels, flying experiments have shown that the maximum heat flux density that diamond microchannels can withstand is up to 500W / cm2, which can meet the heat dissipation of extremely high heat flux spacecraft Claim. This research achievement has not only achieved great breakthroughs in the field of thermal management, but also made a splash in the diamond field. The diamond film thickness of the formed diamond microchannel heat sink requires more than 3mm, which is a major growth in the domestic and even worldwide diamond thick film growth. Achievements have obviously driven the technological development of super-hard materials micro-nano processing, diamond semiconductor technology and other fields, and have strongly impacted the application of diamond composite materials in the field of high-precision machining of titanium alloys and aluminum-magnesium alloys!
In order to promote the widespread application of diamond in defense technology, electronic devices and other fields, the research team of Professor Li Chengming will still adhere to the principle of "openness, cooperation, competition, and progress", continue to promote technological breakthroughs and original innovations, and build this road in China. Go ahead!