To assist as an alternative to copper in composite aircraft and wind turbine, applications tests demonstrate potential for Talphene-enhanced composites. The results of conductivity show 500% increase in dielectric constant over anti-icing surface temperatures well in excess of 100oC without damage and reference. While maintaining similar aircraft lightning strike protection performance it saves 75% weight of standard copper-mesh.
Using a distribution of Talga graphene carbon fiber reinforced polymer was constructed in the epoxy-based resin of the composite and subjected to a range of conductivity tests relevant to aircraft applications. As copper mesh panels currently are used in composite aircraft, saving 75% of the weight of the copper, results showed the Talphene panel provided similar lightning strike protection.
Talphene’s important conductivity included up to 100% increase in resin thermal conductivity, 500% increase in dielectric constant further results demonstrated as well as spot temperatures well over 100 degrees celsius in anti-icing trials. These results are highly positive since CFRP resins are normally non-conductive.
For applications such as lightning strike protection and wing anti-icing on aircraft he ability to improve the electrical, weight and thermal conductivity of CFRP composites has significant benefits both of which currently use heavy copper mesh. Wind turbine blades that require manual or chemical de-icing in winter would be benefitted by the same technology.
A respected material science and engineering institute near UK, Cambridge, and Cobham Technical Services, TWI where Talga graphene enhanced epoxy composite prototypes were tested under certified aerospace standard laboratory conditions.
Produced from the company’s Vittangi graphite deposit in Sweden, the prototype formulation was prepared using Talphene and using a proprietary method developed by Talga Technologies Limited in the UK was dispersed. To disperse the Talphene and construct the CFRP samples to be tested the program evaluated epoxies from Hexcel, Bitrez, 3M and Huntsman.
According to ISO8301:1991 Ed1 tests were conducted on 600mm x 600mm three-ply CFRP panel samples measuring electrical properties by dielectric constant, according to EUROCAE ED-105A to Zone 2A lightning strike tests at Cobham Technical Services strike specification and using MacGregor power supply and thermal imaging anti-icing tests by Joule heating.
Driven by increased demand for lower weight, higher strength and multi-functionality, the global composite market is worth over USD $82 billion/year and is rapidly growing across sectors in aerospace, renewable energy and automotive markets.
Talga Resources Limited (ASX: TLG) is trading at a current market price of $0.440 as at November 28, 2018.
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