Aerospace technology combines extreme environmental conditions with highly integrated electronics. Temperature cycles, mechanical stresses, RF resonances, and low outgassing all affect components and electrical systems simultaneously. As miniaturization increases, so do the requirements: modules are packed more tightly together, tolerances are tighter, and design margins are shrinking.
This article provides a technical overview of key influencing factors—ranging from EMC and RF behavior to thermal management and outgassing. The focus is on the fundamentals and interrelationships for teams in development, testing, and aerospace engineering.
Materials Technology in Space Exploration—What Are the Key Requirements?
Materials for spaceflight must not only work on paper, but also in the actual installation environment. There, several factors come into play simultaneously:
- Temperature changes alter contact surfaces and pressure conditions.
- Mechanical loads —such as vibrations during startup—affect tolerance chains.
- HF effects in narrow metal structures generate resonances and couplings.
- Aging and cycles alter stiffness, contact, and electrical properties.
- Outgassing can affect optics, sensors, and RF modules.
Taken together, these effects determine how reproducibly and stably systems operate in orbit—regardless of whether traditional aerospace or NewSpace technology is used.
EMC and High Frequency – Why RF Absorption Is Critical in Satellite Systems
In satellites, RF modules, electronics, and power supply units are located in close proximity to one another. This increases the likelihood of:
- Internal Reflections
- Cross-talk
- standing waves
- HF couplings between subsystems
HF absorbers help to specifically control these effects. They attenuate reflections off metal surfaces, stabilize the electromagnetic environment, and ensure that measurement and communication paths remain stable.
Practical examples:
- When validating communication modules, if reflective environments affect the measured values.
- In compact assemblies where metal surfaces promote resonance.
- In test chambers, when the angle of incidence and geometries vary.
Our article on sensor technology in autonomous driving illustrates just how much HF reflections can affect signal quality. Absorbers are also used there to stabilize measurement environments:
https://www.electronic-service.de/wissenswertes/sensorik-autonomes-fahren/
For more technical information, please visit the Knowledge Center:
Thermal Management in Satellites – Targeted Heat Dissipation
Since convection does not occur in a vacuum, heat must be dissipated through contact surfaces and radiation. Varying gap dimensions, temperature changes, and mechanical stresses place high demands on thermal materials.
Key Factors
- Clearances change due to cycles and forces.
- Hotspots occur when there is a high power density.
- Drift affects electrical and thermal properties.
- The stability of the heat path determines performance and service life.
Typical Material Classes
- Thermal Conductive Gels and Pastes – When Gap Sizes Vary
- Gap Filler – When Contact Surfaces Are Clearly Defined
- Phase-Change Materials — for More Consistent Contact Over Multiple Cycles
For reliable thermal management, it is not thermal conductivity alone that matters, but rather the interplay of pressure, geometry, aging, and test strategy.
Outgassing in Spaceflight—Why Low Outgassing Rates Are Critical
In a vacuum, materials release volatile components. These can deposit as a film on optical components or RF surfaces.
Relevant metrics:
- TML – Total Mass Loss
- VCM – Volatile Condensable Materials
Materials with low outgassing are essential for sensitive components.
Real-world example: According to the data sheet, CHO-Therm 1671 meets NASA’s outgassing requirements. However, the project-specific limits and the associated documentation are always decisive.
NewSpace Technology – Trends in Integration and Material Selection
NewSpace shortens development cycles, increases integration density, and brings material decisions forward in the design process.
Key Trends:
- Functional integration in a compact space
- Faster qualification and testing methods
- Real-world construction site tests instead of isolated laboratory measurements
- Reproducible material data for mass production
- Focus on Aging, Compressive Behavior, and Mechanical Stability
Teams in the field of aerospace engineering in Germany are therefore increasingly viewing materials technology as a critical factor in structural stability.
FAQ – Space Technology & Material Solutions
What requirements apply to materials used in the aerospace industry?
Temperature fluctuations, vibrations, and EMC effects all occur simultaneously. Under these conditions, materials must remain stable throughout the entire mission.
What role do heat-conducting materials play in satellite and launch vehicle systems?
Gap fillers, thermal paste, and thermal gel close gaps, reduce hot spots, and stabilize electrical and thermal properties.
Can HF absorbers also be used in satellite technology test laboratories?
Yes. RF absorbers improve the reproducibility of measurements in test boxes, EMC chambers, and RF setups.
Are there any materials that are “NASA-approved” in terms of outgassing?
CHO-Therm 1671 is NASA-compliant due to its low outgassing. Many thermal materials also meet TML/VCM requirements.
Do you have any other questions?
If you’re working on a space project or would like to evaluate materials for an assembly, we’d be happy to assist you. Simply send us the key specifications—such as the target range, temperature profile, or installation space—and we’ll provide a clear, application-specific recommendation for your setup.
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