Silicone-free thermally conductive phase change materials

October 08, 2018 // By Julien Happich
Phase change materials soften significantly once heated above their phase change temperature and perform as well, or sometimes even better than a traditional thermal grease.

These materials can also offer long-term stability and are highly suited to thermally challenging applications where product life expectancy and reliability may be critical. Such applications include LED lighting, automotive electronics and remotely located wind power inverters.

Electrolube recently added two new thermally conductive phase change materials to its thermal management product portfolio: TPM350 and TPM550. TPM350 has a thermal conductivity of 3.5W/m.K and becomes workable at approximately 50°C. At this 'activation' temperature it changes state to become a lower viscosity material, minimising contact thermal resistance and improving thermal conductivity. Once it cools, it reverts back to its original state. The material’s advanced formulation ensures minimal contact thermal resistance.

TPM550 has a higher thermal conductivity of 5.5W/m.K and an activation temperature of 45˚C. In common with the TPM350 product, TPM550 is thixotropic, which prevents flow outside of defined interfaces. Both TPM350 and TPM550 can be reworked and their low specific gravity means that more applications can be served per kilogram of the materials, reducing production costs.

The new phase change materials are silicone-free, have an operating temperature range of -40 to +125˚C and are RoHS-2 compliant. TPM350 and TPM550 are screen printable and, while they do contain small amounts of solvent to improve wettability on application, this rapidly evaporates following application to leave the solid phase change material on the substrate. Both products are formulations comprising an advanced polymer matrix and a dispersion of highly thermally conductive fillers that determine the material’s phase change temperature with great accuracy.

Electrolube - www.electrolube.com


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