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PI aluminum plated film · Aerospace grade thermal control and optical materials
In satellite engineering photos, it is often seen that the surface of the spacecraft is covered with a shiny golden "blanket". Many people's first reaction is "gold" - in fact, this is a multi-layer insulation component (MLI), whose core layer material is PI aluminum plated film.
The space environment imposes almost stringent requirements on materials. The temperature on the sunny side of the spacecraft can exceed 200 ° C, while on the sunny side it can drop below -200 ° C. MLI is composed of dozens of alternating layers of aluminum plated films and spacer layers, with each layer of aluminum plated film serving as an efficient radiation reflection barrier. Aromatic PI film has become an indispensable film material for the outermost layer of MLI due to its high heat resistance and stability to cosmic radiation for about 10 years.
Core Insights:The reason why PI aluminum coated film is capable of fulfilling this role is due to the deep synergy between PI substrate and aluminum coating at the material level - PI provides a "skeleton" that can withstand extreme environments, while aluminum provides "functions" of optical reflection and conductivity.
The performance advantage of PI aluminum plated film comes from the fact that both PI and aluminum materials contribute unique characteristics that cannot be replaced by each other.
Long term -269 ° C~260 ° C, short-term>400 ° C; radiation resistance (5 × 10 ⁹ rad fast electron irradiation intensity retention rate of 90%); Dielectric constant~3.4, insulation resistance of 1000 trillion Ω· cm; wear-resistant and tear resistant.
The conductivity is second only to copper/silver, the thermal conductivity is three times that of iron, and the surface reflectivity can reach 97%; UV visible near-infrared reflectance ≥ 92%; Barrier gas/moisture, with a resistivity as low as 10 Ω· cm.
The aluminum layer preparation of PI aluminum plated film mainly adopts vacuum evaporation process - in a vacuum environment, high-purity aluminum wire or aluminum block is evaporated into gas by heating, and then deposited on the surface of PI film to form a coating.
Ensure the free path and deposition uniformity of aluminum vapor molecules, eliminate gas interference, and ensure the purity of the coating.
Plasma treatment, ultraviolet irradiation, or chemical etching can improve surface activity and enhance adhesion.
Aluminum evaporation temperature~1200-1400 ° C, precise control of rate to ensure uniform and dense coating.
Cooling, curing, and testing to ensure product stability.
Single/double-sided aluminum plating:Provide insulation on one side and conductive reflection on the other side; The double-sided reflectivity is better, and the substrate thickness can cover from 7.5 μ m to 300 μ m. The thickness of the aluminum layer can be customized according to needs.
-269 ° C~260 ° C long-term,>400 ° C short-term, double-sided aluminum plating can reach -250 ° C~290 ° C.
UV visible near-infrared ≥ 92%, unidirectional ≥ 95%, double-sided is better.
The resistivity is as low as 10 Ω· cm, and the surface resistivity is ≤ 1.0 Ω/sh.
Barrier gas/moisture, humidity 90%/72h, no significant change in internal moisture.
Tensile strength ≥ 150MPa, wear-resistant and tear resistant, maintained after aluminum plating.
5 × 10 ⁹ rad fast electron irradiation intensity retention rate of 90%, dielectric constant of~3.4, insulation resistance of 1000 trillion Ω· cm.
| performance metrics | typical value |
|---|---|
| Long term use temperature | -269 ° C to 260 ° C |
| Short term temperature tolerance | Above 400 ° C |
| Visible light reflectance (single-sided) | ≥92% |
| Unidirectional reflectance | ≥95% |
| resistivity | ≤10⁻⁶Ω·cm |
| surface resistivity | ≤1.0Ω/sq |
| Dielectric constant (1MHz) | ~3.4 |
| insulation resistance | 1000 trillion Ω· cm |
| Radiation resistance (fast electron) | Strength retention rate of 90% after 5 × 10 ⁹ rad |
MLI core layer material, unidirectional PI aluminum coating with a reflectivity of ≥ 95%, used for satellite, rocket, and propulsion system pipelines. Aluminum coated Kapton is widely used on the inner and outer surfaces of spacecraft to maintain thermal regime and long-term stability of space environment, which has been verified.
FPC shielding layer, grounding layer, EMI protection; Heat resistant film with high tenderness; Anti static performance (ESD test pass rate ≥ 99%); Potential applications of wearable devices and flexible display screens.
High precision flexible reflector, lightweight focusing system, scanning mirror, laser cavity reflector; Electrode materials for optoelectronic devices, with high conductivity for efficient current transmission; Ideal choice for lasers and optical sensors.
Advanced Institute (Shenzhen) Technology Co., Ltd. was established in 2016 and is a national high-tech enterprise specializing in flexible substrate coating, shielding materials, absorbing materials, and precious metal pastes. The company has independently built magnetron sputtering and vacuum evaporation production lines, using roll to roll continuous production technology.
The thickness of PI film can be customized as needed, ranging from 5 μ m to 300 μ m.
Single sided aluminum plating or double-sided aluminum plating.
Commonly used at 400-800 Å, can be customized according to needs.
The width can reach 1550mm.
Vacuum evaporation (core), magnetron sputtering, etc.
Plasma surface pretreatment, precise vacuum degree and evaporation rate control.
Customized from 7.5 μ m to 300 μ m, ultra-thin (5-12.5 μ m) suitable for lightweight/flexible requirements, thick specifications for high mechanical strength scenarios.
Single sided for single-sided reflection/conduction; Double sided is used for double-sided reflection or conductivity.
Commonly used at 400-800 Å, the thicker the thickness, the stronger the reflectivity and barrier properties, and can be customized according to needs.
Clear temperature, irradiation, and chemical environment, PI aluminum coating covers -269 ° C~400 ° C, suitable for the vast majority of extreme environments.
Width can reach 1550mm, length 100-1500m/roll, suitable for mass production of large-area MLI and optical reflective films.
The essence of PI aluminum coated film is an engineering material that combines the extreme environmental resistance of PI film with the optical reflection and conductivity functions of aluminum coating. PI provides a "skeleton" - structural support that is resistant to high and low temperatures, radiation, high insulation, and high strength; Aluminum provides "functionality" - high reflectivity, conductivity, and barrier performance output. The synergy between the two makes PI aluminum coated film an irreplaceable material option in high-end applications such as spacecraft thermal control MLI, flexible electromagnetic shielding, and precision optical reflection.
Understanding the engineering logic behind the combination of PI and aluminum - why PI instead of PET, why aluminum instead of silver or gold, and the choice between single-sided aluminum plating and double-sided aluminum plating - is the key to upgrading PI aluminum plating film from a "roll of aluminum plating film" to an "engineering decision".
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