Introduction
After the Chang’e-5 probe’s lander and ascender assembly successfully landed on the lunar surface, Before ignition and takeoff, a five-star red flag carried on the lander was successfully unfolded, marking the first time that the lunar flag display system was successfully displayed on the moon.
Different from the spray-painted national flags on the Chang’e-3, Chang’e-4 and Yutu lunar rover, the national flag displayed by the Chang’e-5 probe this time is a real ” Fabric Edition” banner.
China Aerospace Science and Industry National Flag Display System Design Team Conducts Technical Seminar
In the history of China’s aerospace industry, the first fabric flag that was successfully displayed on the moon under harsh environmental conditions without temperature control. The lunar flag display system was jointly developed by China Aerospace Sanjiang Group, Wuhan Textile University and other units. The flag was completed by Professor Xu Weilin’s team from the State Key Laboratory of New Textile Materials and Advanced Processing Technology at Wuhan Textile University after eight years of continuous research. Huamao Group Participating in the development and production together, Huamao Group uses its more than 60 years of production experience and strict quality control technology to provide nearly “harsh” quality assurance to ensure the aerospace quality of the national flag.
The Chang’e-5 lunar flag display system is one of the components of the payload subsystem, and it is also the only key project of the payload subsystem. This is a true “fabric version” flag. However, due to the strong electromagnetic radiation in the cosmic environment and the temperature difference of plus or minus 150 degrees Celsius on the moon’s surface, ordinary flags cannot be used on the moon.
Ma Wei, the project director of the national flag display system, said that the national flag display system is an extravehicular single-machine system. After the launch vehicle throws away its fairing, it enters the lunar orbit from the Earth-moon transfer orbit, and then to the detection Even after the spacecraft landed on the moon, it has been exposed to extremely harsh environments. “We found through experiments that if the national flag used on the earth is placed on the moon, its color will fade, cross-color, or even fade in a short period of time. Decomposition.”
In the early days of the national flag display system project, the scientific research team designed a variety of national flag display forms, including memory alloy display solutions, servo flag raising solutions, institutional display solutions, etc., which were unfolded in the form of a scroll There is also a way to unfold the national flag in the form of a folding fan. However, after high and low temperature tests, it was found that only the flag unfolded in the form of a scroll is relatively flat and will not wrinkle.
How can we ensure that the national flag has sufficient strength and remains flat when it is unfolded? The development team found in the study that some fiber materials have high strength but poor dyeing performance, and the strength of fiber materials with good dyeing performance does not meet the requirements.
While reviewing literature and materials, the development team conducted extensive research and demonstration, and worked with domestic superior units to carry out joint research on key technologies. Cheng Chang, the technical director of the national flag display system, said that the scientific research team spent more than a year on material selection, and finally selected 20 or 30 kinds of fiber materials, and then through the thermal matching, high and low temperature resistance, anti-static, and anti-static properties. Through physical tests including lunar dust, the scientific research team finally decided to use a new composite material that can not only meet the strength requirements, but also meet the dyeing performance requirements, thereby ensuring that the national flag can withstand the harsh environment of the lunar surface and does not fade or cross. Color, no deformation.
This flag is mainly made of domestic high-performance aramid fiber materials and is made of Wuhan Textile University, which won the National Science and Technology Progress Award. The first-prize winning “high-efficiency short-process embedded composite spinning technology” overcame the technical problem of preparing high-quality yarns with high modulus differential fibers and prepared high-quality moon display national flag fabrics; it used small molecule control technology to achieve aromatic fabrics. The structure control and color construction of polyester fibers are achieved, and on this basis, excellent sun fastness is achieved under extreme UV conditions.
Preparing to display the national flag before the environmental test of the Fifth Aerospace Academy
Professor Xu Weilin of Wuhan Textile University and team members Wang Yunli, Cao Genyang, Sheng Dan, and Pan Heng discussed technical issues in national flag development
The “fabric version” of the Chang’e-5 five-star red flag developed by Wuhan Textile University took a photo before flying into space
The flag At the same time, micro-nano silk powder was prepared using the “Ultra-fine powdering technology of high-quality natural polymer materials and its high value-added reuse technology” that won the second prize of the National Science and Technology Invention Award from Wuhan Textile University, and utilized its synergy with pigment particles. effect,Essentially solves the problem of pigment sublimation and thermal migration fastness under extreme conditions. Through the above technical research, we have achieved the goal of building a high-color fastness color for the national flag that can withstand conditions such as extreme high vacuum, high and low temperature cycles, and strong metering ultraviolet radiation in the space environment.
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