Thermal conductivity | additives feature Armin Kayser of ESK ceramics introduces a new generation of
hexagonal boron nitride fillers for producing thermally-conductive compounds that are also electrically-insulating
raising thermal conductivity with hexagonal boron nitride
Thermoplastic compounders are facing new challenges and opportunities in high-volume end-user markets, such as lEd systems plus vehicle electric drive systems and batteries. However, for many applications in these markets, metal replacement will only be possible if injection moulded parts can offer sufficient thermal conductivity. So far, design engineers have either used cast metal housings where high thermal flux is necessary, or standard polymer compounds for applications with low energy density [7]
. However, new high-volume technolo-
gies require both: highly-integrated housings, sub- strates and heat sinks with efficient thermal manage- ment and low system costs in mass production.
www.compoundingworld.com
The market entry of thermally conductive com- pounds in the past has been hindered by a number of factors: 1. it is only in recent years that the oEm market has demanded such solutions
2. There are processing challenges when using thermally conductive fillers 3. The requirements for thermal conductivity were unrealistically and unnecessarily high in the early development steps
4. last but not least, the high costs of filler materials and thermally conductive compounds The first obstacle fell when manufacturers of lEds and high-power electronic components, for example for
February 2012 | compounding world 25
Fig. 1: SEM of boron nitride
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56