MATERIALS | THERMALLY CONDUCTIVE
a cold-touch surface, as well as high density, making it a distinctive addition to Xenia’s typically lightweight-focused portfolio.” Xeramic compounds are formulated by combin- ing selected base polymers with a precisely engi- neered ceramic filler. They are available in a bio- based PPA polymer matrix: Xeramic Pure has a high level of ceramic content, while the Core version combines carbon fibre with ceramic reinforcement. The Pure version “delivers a unique balance of performance, thermal conductivity and aesthetic refinement, making it ideal for applications where surface quality and high properties are both essential”, said Xenia. It says Core is an innovative formulation, based on a bio-sourced PPA polymer matrix, and merging the distinctive characteristics of ceramic reinforcement with the mechanical properties of carbon fibre.
Ceramic benefits Ceramic-filled thermoplastics are also the focus of a project undertaken by researchers at Northeastern University, in Boston, USA. Its website reported on the project in July, quoting lead researcher Prof Randall Erb, head of the university’s Directed Assembly of Particles and Suspensions Lab: “Managing heat is a big challenge for power electronics and devices like radar antennas. When electronics overheat, you either have to slow them down or turn them off. That might be fine for a phone, but not for critical systems like radar.” The Northeastern researchers worked in collabo-
ration with the US Army Research Laboratory, developing a material that combines ceramics, polymers and additives. The team used 3D printing to engineer the material, using the process to position ceramic particles and then heating to connect them with the polymer. This creates a network which allows heat to travel efficiently, making the material even more thermally conduc- tive than stainless steel, while being four times
lighter, according to the website. “These new materials can cover and protect
circuits without causing electrical shorts,” said Erb. “They help pull heat away from advanced telecom- munication devices without blocking their signals.” Former PhD student Daniel Braconnier said: “Industry keeps pushing for higher power in smaller packages, which means devices keep getting hotter.” As well as small devices, the researchers see potential for the materials to be used in EVs. “Our material could be used around battery cells to spread out and remove heat, helping prevent thermal runaway events,” said Erb. The team is now looking at ways to scale up
production of the materials in partnership with the US Army Research Laboratory. Tisan Engineering Plastics has highlighted its thermally conductive comounds that provide strength, performance and flame retardancy. It said its Tislamid PA 66, which is reinforced with glass fibre and special filler, offers more than 5 W/mK through/plane thermal conductivity as well as advanced flame resistance certified by UL V0 rating up to 1.6 mm, but also maximum glow wire perfor- mance with GWFI equal to 960° C. Another grade of Tislamid PA 6 with special filler and glass fibre filler has 5.5 W/mK through/plane thermal conductivity, improved mechanical properties and high strength. Another highlighted thermally conductive polymer in Tisan’s Tisoplen portfolio is a PP-based compound, with special filler offering 0.95 W/mK through/plane thermal conductivity and electrical insulative properties.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.covestro.com �
www.syensqo.com �
www.politubes.com �
www.xeniamaterials.com �
www.northeastern.edu �
www.tisan.com.tr
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