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WACKER presents thermal conductive silicone materials for EVs
Issue date:09/07/2018
CPRJ Editorial Team
(SC)
SEMICOSIL 96X TC series thermal conductive silicone gap fillers are the excellent thermal management materials for the key components of electric vehicles, such as battery module, power control and on-board charger.
SEMICOSIL 96X TC series thermal conductive silicone gap fillers are the excellent thermal management materials for the key components of electric vehicles, such as battery module, power control and on-board charger.

WACKER showcased several thermal conductive silicone materials for electric vehicles (EVs) at EVTech Shanghai 2018, which took place from July 4 to 7.

Non-curing thermal conductive silicone paste

Among them was SEMICOSIL Paste TC, a new non-curing silicone paste which can be used as a gap filler for the heat sinks of Printed Circuit Boards (PCB) for Insulated Gate Bipolar Transistors (IGBT).

The recently developed SEMICOSIL Paste 30 TC and SEMICOSIL Paste 40 TC are both one-component, non-curing, low-stress silicone pastes with a thermal conductivity at 3.0W/mK and 4.0W/mK respectively.

Thanks to the exceptional flowability, the products cure to form a thin, homogenous layer that can easily compensate surface tolerance of the component. For optimum heat transfer, only a very thin layer is needed.

SEMICOSIL Paste TC can not only be used for fast dispensing and printing process, but also for filling tiny gaps between thermal interfaces. Furthermore, the product is stable under thermal aging conditions and is suitable for the heat management of PCB for electrical vehicles.

Curing thermal conductive silicone potting glue

In addition, the company demonstrated ELASTOSIL RT 76XX TC series, an addition curing, thermal conductive silicone potting glue which offers low viscosity and good thermal conductivity ranging from 1-2 W/mK. The product cures at room temperature.

Due to their exceptional flowability, they are especially suitable for the potting of articles with complex structures.

This series can be used for the thermal management of 48-volt batteries, on-board chargers and power converters. Elasticity remains unchanged between -50 and +180°C, the potting glue meets the challenging long-term reliability needed for electrical vehicles.

Thermal conductive silicone gap filler

Another highlight was SEMICOSIL 96X TC. The thermal conductive silicone gap filler enables low-stress and gap-free thermal conductive filling between the heat source and heat sink. It is an ideal thermal management material for the key components of electric vehicles, such as battery modules, power controls and on-board chargers. 

The product cures at room temperature via addition reaction to form soft silicone elastomers with tacky surfaces. The cured rubber achieves a thermal conductivity of 2 to 3.5W/m.K, and, at the same time, is electrically insulating.

SEMICOSIL 96X TC can be quickly dispensed to meet the requirements of industrial production processes. Before curing, the product features good rheological properties which ensure high-speed and non-sag dispensing.

The optimized formulation for dispensing systems allows them to be easily fed by machine with lower wear, and therefore achieve a stable and efficient production. The flexible design of the dispensing process allows one glue to be used to seal articles in different sizes, which is easier in terms of material management.

Several product grades are available to meet properties and functions required for key components of electric vehicles, such as high and low strength, low density, cooling fluid resistance and the sealing of fuel cells.

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