CN-121976103-A - Corrosion-resistant magnesium alloy additive manufacturing temperature-equalizing plate for satellite

CN121976103ACN 121976103 ACN121976103 ACN 121976103ACN-121976103-A

Abstract

The invention relates to the technical field of magnesium alloy, and discloses a corrosion-resistant magnesium alloy additive manufacturing temperature equalizing plate for satellites, which comprises a shell, a liquid injection port and a liquid suction core structure arranged in the shell, wherein the shell and the liquid suction core are integrally formed by adopting a laser selective melting technology and have no welding joint, the liquid suction core adopts a three-period minimum curved surface gradient lattice structure, the liquid suction core has porosity gradient distribution, an evaporation area in contact with a heat source adopts a low-porosity lattice, a condensation area and a transmission area adopt aperture high-porosity lattices, the temperature equalizing plate is prepared by special corrosion-resistant magnesium alloy, the alloy takes magnesium as a matrix and contains gadolinium 1.5-4.0%, zinc 0.5-1.5%, calcium 0.2-0.8% and zirconium 0.1-0.5% in percentage by mass, and the total addition amount of alloy elements is not more than 6%. The invention realizes the weight reduction of the temperature equalization plate, simultaneously gives consideration to excellent corrosion resistance and high-efficiency temperature equalization heat transfer capability, and meets the use requirement of a space flight thermal control system.

Inventors

CHEN YUYANG
ZHU GUOQIANG
ZHANG WEI
XIANG WEI
LIU KAIDI
DENG SHUXIONG
LI TING

Assignees

上海交通大学四川研究院

Dates

Publication Date: 20260505
Application Date: 20260330

Claims (10)

1. The corrosion-resistant magnesium alloy additive manufacturing temperature-equalizing plate for satellites comprises a shell, a liquid injection port and a liquid suction core structure arranged in the shell, and is characterized in that the shell and the liquid suction core are of a laser selective area melting integrated forming structure, the liquid suction core adopts a three-period minimum curved surface gradient lattice structure, the liquid suction core comprises an evaporation area, a condensation area and a transmission area, the evaporation area is of a low-porosity lattice structure with the aperture of 50-100 mu m, and the condensation area and the transmission area are of a high-porosity lattice structure with the aperture of 200-400 mu m; The temperature-equalizing plate is prepared from corrosion-resistant magnesium alloy, wherein the chemical components of the corrosion-resistant magnesium alloy comprise, by mass, 1.5% -4.0% of gadolinium, 0.5% -1.5% of zinc, 0.2% -0.8% of calcium, 0.1% -0.5% of zirconium and the balance of magnesium, and the total addition amount of alloy elements of the corrosion-resistant magnesium alloy is less than or equal to 6%.
2. The corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to claim 1, wherein the three-period minimum curved surface structure is any one of Gyroid type, diamond type, and I-WP type.
3. The corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to claim 1, wherein the porosity of the evaporation zone is 45% -55%, and the porosity of the condensation zone and the transmission zone is 70% -80%.
4. The corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to claim 1, wherein the base body thermal conductivity of the corrosion-resistant magnesium alloy is not lower than 96W/(m-K).
5. The corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to claim 1, wherein the corrosion-resistant magnesium alloy comprises the following chemical components in percentage by mass of 2.8% of gadolinium, 1.0% of zinc, 0.5% of calcium, 0.3% of zirconium and the balance of magnesium.
6. The corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to claim 1, wherein the wick adopts a Gyroid-type gradient lattice structure, the porosity of the evaporation area is 50%, the pore diameter is 80 μm, the porosity of the condensation area and the transmission area is 80%, and the pore diameter is 400 μm.
7. A method for preparing the corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to any one of claims 1 to 6, which is characterized by comprising the following steps: S1, model processing, namely establishing a three-dimensional model of a temperature equalization plate containing a gradient three-period minimum curved lattice, and setting the thickness of a slice layer to be 30-50 mu m; S2, performing laser selective fusion molding, namely performing integrated printing molding by adopting spherical powder of the corrosion-resistant magnesium alloy under an argon protection atmosphere, wherein a shell adopts a first printing parameter and a liquid suction core adopts a second printing parameter, wherein the first printing parameter is laser power 180-220W and scanning speed 800-1000mm/S, and the second printing parameter is laser power 120-150W and scanning speed 1000-1200mm/S; S3, post-treatment, namely sequentially carrying out powder cleaning and vacuum annealing stress relief treatment on the uniform temperature plate formed by printing, and then injecting working medium through a liquid injection port and sealing.
8. The method for manufacturing a corrosion-resistant magnesium alloy additive manufacturing temperature-uniforming plate for satellites according to claim 7, wherein in the step S2, the volume energy density of the shell printing is 55-80J/mm 3 , and the volume energy density of the wick printing is 35-55J/mm 3 .
9. The method for manufacturing a temperature-equalizing plate for satellites by using the corrosion-resistant magnesium alloy additive according to claim 7, wherein in the step S3, the working medium is acetone or methanol.
10. The method for manufacturing a temperature-uniforming plate for a satellite by using a corrosion-resistant magnesium alloy additive according to claim 7, wherein in the step S2, the first printing parameter is laser power 200W and scanning speed 900mm/S, and the second printing parameter is laser power 130W and scanning speed 1000mm/S.

Description

Corrosion-resistant magnesium alloy additive manufacturing temperature-equalizing plate for satellite Technical Field The invention relates to the technical field of magnesium alloy, in particular to a corrosion-resistant magnesium alloy additive manufacturing temperature-equalizing plate for satellites. Background With the rapid development of the aerospace technology, the spacecrafts such as satellites and the like show development trends of high integration, light weight and long service life, the integration level and the operation capability of the spaceborne electronic equipment are continuously improved, the heat dissipation requirement of high heat flux density is brought, and the thermal control system becomes one of core systems for determining the load performance and the operation reliability of the spacecrafts. As a high-efficiency two-phase heat transfer element based on the phase change of working medium vapor-liquid, the temperature equalizing plate has the advantages of high heat transfer efficiency, excellent in-plane temperature equalizing property, no moving parts and strong reliability, and is widely applied to the thermal management systems of spacecrafts such as satellites. At present, copper or aluminum alloy is mostly adopted as a matrix material for a temperature equalization plate mainly applied in the aerospace field. The copper-based temperature-equalizing plate has excellent heat conduction performance and mature process, but the density of copper is as high as 8.96g/cm 3, the weight cost is extremely high, the light weight design and the emission cost control of satellite load are seriously restricted, the density of the aluminum-based temperature-equalizing plate is 2.7g/cm 3, compared with copper, the aluminum-based temperature-equalizing plate realizes obvious weight reduction, but the heat conduction performance is lower, and the requirement of a satellite thermal control system on extremely light weight still cannot be met. The magnesium alloy is used as a metal structural material with the lowest density in the current engineering application, the density is only 1.74g/cm 3, and the magnesium alloy has high specific strength and good processability, and is an ideal substitute material for a lightweight thermal control element of a spacecraft. Meanwhile, the development of laser selective melting (SLM) additive manufacturing technology breaks through the limitation of the traditional machining and welding processes, can integrally form a component with a complex internal cavity and a micro liquid suction core structure, and provides technical feasibility for the design and manufacture of the magnesium alloy temperature-equalizing plate. However, in the prior art, three major core technical bottlenecks still exist in engineering application of the magnesium alloy temperature equalization plate, and the service requirements of space conditions such as satellites cannot be met: Firstly, the corrosion resistance of magnesium alloy is extremely poor. Magnesium has active chemical property, the standard electrode potential is extremely low, electrochemical corrosion is extremely easy to occur in salt fog and humid environments in the ground storage, marine transportation and emission field parking stages, pit corrosion and even perforation leakage occur, the temperature equalization plate is directly caused to fail, and the severe requirements of aerospace products on long-term storage reliability and environmental adaptability cannot be met. Secondly, the inherent contradiction that the heat conducting property and the corrosion resisting property of the magnesium alloy are difficult to reconcile exists. In the prior art, the conventional means for improving the corrosion resistance of the magnesium alloy is to add a large amount of alloy elements such as Al, zn and the like, and the method can improve the corrosion resistance to a certain extent, but can cause lattice distortion of a magnesium matrix, remarkably increase phonon scattering, sharply reduce the heat conductivity of the matrix, directly weaken the heat transfer and the temperature uniformity of a temperature-uniformity plate, and cannot adapt to the heat dissipation requirement of high heat flux density of spaceflight. Thirdly, the SLM forming difficulty of the magnesium alloy micro-fine liquid suction core structure is high. The magnesium alloy powder has the characteristics of low laser absorptivity and low boiling point, and when the micro lattice liquid absorption core structure in the temperature equalizing plate is printed, forming defects such as spheroidization effect, structural fracture, unmelted powder adhesion and the like are extremely easy to occur, so that the capillary driving force of the liquid absorption core is insufficient, the reflux permeability of working medium is low, the heat transfer limit of the temperature equalizing plate is finally reduced, and even two-phase circulation heat trans