The No. 5 Lander Propulsion Subsystem Thermal Test Finalized

2020-11-29 06:17:19
China Instrument Network Instrument Research and Development (R&D) recently learned from China Aerospace Science and Technology Corporation that the successful trial of the Propulsion System Submarine Propulsion Subsystem of the Chang'e No. 5 has been a complete success, marking the perfect completion of the thermal test vehicle of the Propulsion System of the No. 5 Lander. .

According to experts from the General Department of China Academy of Aerospace Science and Technology Corporation, at present, researchers are carrying out all related work on the final assembly and testing phase of the Chang'e V. The technical status and quality of Chang'e V are controlled and the plan is progressing smoothly.
China will launch the Chang'e V detector around December this year to achieve a lunar soft landing and sample return. This means that the final step of the three-step "around, falling, and returning" project of China's lunar exploration project is about to be completed.
Hu Hao, the chief designer of the third phase of the China Lunar Exploration Project, introduced that the No. 5 weighing 8.2 tons will be launched by China’s largest long-haul No. 5 launch vehicle.
This task is expected to achieve four "firsts" since China began space activities: for the first time automatic sampling on the moon's surface; for the first time to take off from the moon's surface; for the first time in no one rendezvous and docking on the moon orbit 380,000 kilometers away; for the first time with the moon Earth returns to Earth at a speed approaching the second universe.
China Academy of Aeronautics and Astronautics, Academician Ye Peijian, chief consultant and chief designer consultant of the moon exploration satellite of the five institutes, said that Chang'e 5 includes four parts: the orbiter, the reflector, the ascender and the lander. After reaching the orbit of the moon, the orbiter and the reflector flew around the moon, and the lander and the ascender landed on the lunar surface. The lander is loaded on the ascender with a sampling device mounted on the moon.
The ascender then takes off from the moon's surface and rendezvouses with the combination of the orbiter and the reflector, transferring the collected sample to the reflector and separating it. The orbiter and the reflector assembly fly to the earth and separate at a distance of a few thousand kilometers from the ground. Finally, the reflector returns to Earth.
As one of the most representative projects in the development of China's aerospace industry, the lunar exploration project has a very important and pioneering significance for the development of science and technology in China and the realization of the moon exploration dreams by Chinese people for thousands of years.
Ye Peijian said that in 2018 China will also launch the Chang'e No. 4 and will realize the first soft landing of the aircraft on the back of the moon.
“In the future, we will also carry out the exploration of the moon’s south and north poles and actively carry out various forms of international cooperation such as lunar exploration, scientific research, and scientific research. In the near future, the Chinese must and must be able to go to the moon.” Ye Peijian said .
(Original title: Chang'e V Detector Lander Propulsion Subsystem Successfully Performed Hot Run Test)

Fluorocrystalline mica, also known as Fluorphlogopite Mica, synthetic mica, artificial mica, synthetic mica crystal, belongs to the silicate type artificial mica crystal, is under the high temperature condition of 1500°C, through strict process conditions and material ratio, in platinum The mica crystals smelted in the yttrium have a chemical formula of KMg3(AISi3O10)F2(OH)-, and do not contain (OH)-. The (OH)-hydroxyl group is replaced by F-(fluoro), which is similar to the fluorite mica. Materials commonly used in the general industry are natural mica. Natural mica is an underground ore naturally formed and belongs to the class of silicates. Most of the industrial mica used is phlogopite (brown) and muscovite. Its ideal chemical formula is KAI2(AISi3O10)(OH)2. OH)-(Hydroxy), due to the presence of hydroxyl (water molecules), its performance in all aspects is far lower than that of fluorocrystalline mica.

The main characteristics of fluoride crystal mica:

1, high temperature: can work long-term in the 1100 °C environment.

The testing department of the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (nationally recognized testing institute) tested the thermal weight loss of 8% at 1100°C for 48 hours, and the melting and devitrification temperature was 1375°C.

2. Electrical insulation: The volume resistivity is 10 times higher than natural mica. Electrical breakdown strength is PTFE

Lean 10 times.

3, hot and cold blasting stability is very good

5 cycles of -40°C~70°C at the 5th Saibao Lab of the Ministry of Information Industry

Inspection, all qualified.

4, anti-corrosion:

Fluorophlogopite does not react with acid and alkali solutions, and does not react with water. Under the long-term (2 to 3 years) scouring of high-temperature and high-pressure water (including acid and alkali), the original clarity and transparency can still be maintained.

5, high frequency performance:

The dielectric constant of fluorite mica is 4.6 ε, and the dielectric loss is (1~4)×10 −4 tg δ, and the dielectric loss is very low. And because of the pure texture, all parameters are extremely stable.

6, optical properties

Since the fluorite mica contains less impurities, its light transmittance is compared from infrared to ultraviolet.

High, the transmittance is close to 100%.

7, Mosaic (Mosaicity):

The Mosaicite of fluorocrystalline mica is less than 0.25 degrees, which was produced in the experiment.

The neutron flame is not high enough to absorb multi-band light beams and is an ideal neutron monochromator test material.

8, vacuum deflation performance:

The evaporative volume of fluorite mica is low, and it is measured with a mass spectrometer and the trace gas released is only

O2, N2, Ar and other adsorbed gases. Since the H2O vapor is not released, this is extremely valuable for use as an electrical vacuum insulation material, which can greatly increase the service life of the vacuum device.

9, excellent physical properties:

Fluorocrystalline mica has atomicity flatness, transparency, separability and elasticity, not aging

It is not brittle and so on.

Due to the high temperature resistance, corrosion resistance, low frequency loss, and high bulk resistivity

Absorb multi-band light beam, excellent light transmittance and other advantages. Therefore it has become an ideal new material in the high-end area.

Fluorocrystalline mica Available in:

In the range of 180mm×53mm or ∮76mm, it can be processed into various shapes according to user requirements. Thickness within the range of 0.02mm~1.0mm can be allocated according to user requirements. The conventional thickness is 0.04~0.2mm.


Fluorine crystal (fluorphlogopite, artificial mica) mica film for observation window of high pressure boiler water level gauge in thermal power plant


Fluorphlogopite Mica

Fluorophlogopite Mica,Fluorophlogopite Sheet,Synthetic Fluorophlogopite Mica,Fluorophlogopite Mica Fragments

Changchun City Taiyuan FluorphlogopiteCo. Ltd. , https://www.micaslice.com