Hybrid heatsinks combine the thermal conductivity of copper with the advantages of aluminium
Copper and cold sprayed hybrid-heat sinks have almost identical thermal results and outperformed the aluminum heat sink in a substantial fashion, thus showing the importance of quick heat spreading along the base. At the same time, the hybrid-heat sink weighed less than the copper heat sink.
Indeed, hybrid-heat sinks manufactured by cold spraying have higher production cost than commercially available aluminum heat sinks; however, adding a layer of copper on an aluminum heat sink decreases its thermal resistance by 48%. This has a direct effect on the production costs since the semiconductor area can be decreased by 94%. Besides, the deposition efficiency and deposition rates of copper powder by the cold spray process are 95% (including overspray) and 10 kg/h, respectively, indicating the potential of the CS-process to realize a cost-effective large-scale industrial production.
For detailled technical information, you can download the press release about cold sprayed hybrid heatsinks here.
- Cold sprayed hybrid heat sinks have excellent mechanical and physical properties
- Electrical conductivity IACS up to 98%
- Deposition efficiency > 98 %
- Porosity < 0.5 %
- Feed rate 10 kg/h
- Hardness – 107 HV
- Ultimate tensile strength – 285 MPa
- Thermal conductivity 368 W/mK
- Gas tightness < 1 × 10-7 mbar-l/s
- Elongation 25%
- Minimum layer thickness < 50 µm
- Maximum layer thickness - no limit
Different types of cold sprayed hybrid heatsinks
Setup of cold spraying hybrid heatsinks
