Produits conducteurs Thermiques
TOWARDS OPTIMIZED HEAT CONDUCTION IN PLASTICS
The market demand for increasingly powerful products creates a cooling problem in many applications. For instance, continued miniaturization of Electronic & Electrical systems has resulted in a dramatic increase in the amount of heat generated that needs to be dissipated in order to maintain application reliability. As such, the need for materials providing an optimum level of thermal management is of primary importance in many applications such as E&E systems, LED device, Automotive Under the Hood Automotive Applications, Cooling Systems, Heat Exchangers, Motors, Battery Housing, Heat Exchanger etc…
The use of metal cooling devices for heat dissipation is well known, for instance aluminum or copper heat sinks as well as metal housings are very common in many applications. As illustrated in Table 1, metals are often selected owing to their very high intrinsic thermal conductivity vs. plastics but most of the applications do not require such high level of thermal transfer. Taking into account heat transfer mechanisms, it can be seen that if heat dissipation is controlled by free convection through air, thermally conductive plastics are the preferred choice. In such cases, there are multiple advantages of using plastics vs. metal : lower manufacturing cost , freedom of design, corrosion resistance, weight reduction. Last but not least, electrical conductivity or insulation can be obtained depending on the type of fillers used.
Table 1 : Typical Thermal Conductivity of Plastics and Metals
THERMALLY CONDUCTIVE ELECTRICALLY INSULATIVE PLASTICS
Thermally conductive plastics are made by adding specific thermally conductive fillers into polymers via a compounding process. The performance of such compounds is linked to the choice of additives with high intrinsic thermal conductivity. A good dispersion in the polymer matrix and high loading are needed to obtain the required thermal conductivity.
Eurostar EP has launched a new range of Thermally Conductive, Electrally Insulative Plastics based on Polyamide and specific mineral fillers.
Star T PA6 65E12 and Star T PA6 75E12 are new grades formulated with specific mineral fillers in order to reach optimum Through-Plane (respectively 0.9 & 1.5 W/m.K) and In-Plane (1.4 & 2.3 W/m.K) thermal conductivities.
These polyamide compounds offer the following advantages :
– Best-in class Through-Plane Thermal conductivity (1 – 2 W/m.K)
– Electrical Insulation
– Outstanding Mechanical Properties (vs. Boron Nitride)
– Cost Efficient Solution (vs. Boron Nitride)
– Good Processing Behavior
– Low Abrasiveness (vs. Ceramics such as Aluminum Oxide)
Starflam PA66C10VZ23 is the right choice whenever Flame Retardancy is needed. This grade owns an UL Certification, offering UL94 V0 as well as satisfactory RTI ratings. Its average thermal conductivity is around 1 W/m.K.
Staramide 6 76E3 is a low cost alternative whenever limited performance is required.
Table 2 : PRODUCT TREE : Thermally Conductive & Electrically Insulating Polyamide Compounds
* AVERAGE : HOT DISK TEST METHOD / ** THROUGH PLANE LASER FLASH / *** IN-PLANE : LASER FLASH
Table 3 : Typical Properties of Thermally Conductive & Electrically Insulating Polyamide Compounds
THERMALLY CONDUCTIVE ELECTRICALLY CONDUCTIVE PLASTICS
Eurostar EP has launched a new range of Thermally & Electrically Conductive Plastics based on specific Carbon Mix.
Star T 14009 is high end thermally conductive PP compounds based on an optimized Carbon Fiber/ Mineral Fillers system. This grade offers an high thermal conductivity (InPlane – Through Plane : 1.1 – 3.1 W/m.K) together with excellent processability . It has a proven capability in Heat Transfer systems.
Staramide 66 2032YE14 and Staramide 66 1032YE14 are PA-66 compounds based on Carbon Fiber mix. Beside optimized thermal conductivity and electrical conductivity, they offer good processability and high mechanical performance level.
Table 5 : PRODUCT TREE : Thermally Conductive & Electrically Insulating Polyamide Compounds
Table 6 : Typical Properties of Thermally Conductive & Electrically Insulating Polyamide Compounds
** THROUGH PLANE LASER FLASH / *** IN-PLANE : LASER FLASH
THERMALLY CONDUCTIVE AND ELECTRICALLY ACTIVE POLYAMIDE COMPOUNDS BASED ON METALLIC POWDERS
Eurostar EP broadens its range of Metal Powder Filled Polyamide Compounds. These fillers can be copper, iron or bronze based. They offer solutions whenever high density, freedom of design, thermal conductivity is needed. These grades also show excellent processability enabling molding of complex design.
As shown in table 7, some of these grades have been optimized in order to offer high mechanical property profile. For instance Staramide PA6 1565VE10 shows unique combination of rigidity and impact performances.
Table 7 : Typical Properties of Eurostar EP Metal Filled Polyamide Compounds