Diamond and liquid metal composite Thermal Interface Materials
Diamond and liquid metal composite Thermal Interface Materials
1. Ultra-high thermal conductivity
Diamond has intrinsic thermal conductivity up to ~2000 W/m·K, while liquid metals provide highly efficient heat transfer bridges between particles.
→ The combination forms a continuous heat conduction network, significantly outperforming conventional polymer-based thermal interface materials.
2. Reduced interfacial thermal resistance
A major bottleneck in composites is phonon scattering at interfaces (see Phonon Scattering).
Liquid metal:
Conforms to diamond surfaces
Fills microvoids and defects
Creates a solid–liquid–solid interface
→ This dramatically improves thermal coupling compared to dry particle contact.
3. Lower filler loading with high performance
Traditional diamond composites often require >50 vol% filler.
With liquid metal bridging:
Efficient thermal pathways form at lower diamond content
Easier processing and lower viscosity
4. Improved processability
Liquid metal acts as a lubricant:
Reduces mixing viscosity
Enhances dispersion uniformity
Enables scalable manufacturing
5. Mechanical compliance (soft + conformable)
When embedded in silicone or elastomers:
Maintains soft, gap-filling behavior
Conforms to rough surfaces
Reduces contact thermal resistance at interfaces
6. Electrical insulation (engineered systems)
Although liquid metals are conductive:
Low loading + encapsulation in polymer matrix
→ Achieves reliable electrical insulation
7. Reduced mechanical damage risk
Diamond is extremely hard and abrasive.
Liquid metal + polymer coating:
Prevents direct contact with components
Avoids scratching sensitive devices
Typical Applications
1. Thermal Interface Materials (TIMs)
Gap fillers
Thermal pads
Thermal greases
Used in:
CPUs, GPUs
Power modules
RF devices
2. Advanced electronics cooling
High heat flux systems:
AI chips
Data centers
5G communication hardware
3. Electric vehicle (EV) systems
Battery thermal management systems (BTMS)
Power electronics cooling
→ Ensures stability and safety under high load conditions
4. Flexible and wearable electronics
Soft, deformable heat spreaders
Flexible circuits
5. Aerospace and high-reliability systems
Avionics cooling
Satellite electronics
→ Where both thermal performance + reliability are critical
6. Next-generation thermal management technologies
Microelectronics packaging
3D integrated circuits
High-power LEDs
One-line takeaway
Diamond–liquid metal composites uniquely combine diamond’s extreme thermal conductivity with liquid metal’s interface adaptability, enabling high-performance, low-resistance heat transfer in practical, processable materials.