FrostyTech.com Heatsink Reviews and Analysis
      
TOP 5 Heat Sinks     TOP 5 Low Profile Heat Sinks     TOP 5 Liquid Coolers    
 Reviews + Articless     News     HSF Mfg's Index     Advanced Search    
The Future is Annealed Pyrolytic Graphite - FrostyTech.com The Future is Annealed Pyrolytic Graphite
Tue Mar 19, 2013 | 5:00P| PermaLink

When the thermal conductivity of copper and aluminum heat spreaders just won't cut it, what's a space born NASA Laser Death Ray to do? The future it seems, revolves around a material called Annealed Pyrolytic Graphite.

Pyrolytic Graphic is a carbon based material with exceptionally high thermal conductivity - second only to diamond - but only in specific axes; it's also relatively fragile. Thermacore recently sent out a PR about a new hybrid material called 'K-Core Annealed Pyrolytic Graphite' it developed which is essentially APG sandwiched between sheets of aluminum, or other metals. The K-Core material was recently selected by NASA to cool optics in the U.S. Geological Survey Landsat 8 satellite.

www.frostytech.com
Example of K-Core APG material

Let's consider the numbers: where a solid aluminum heat spreader has a thermal conductivity of 126W/mK, the same heatspreader with an Annealed Pyrolytic Graphite core would see thermal conductivity on the order of 1092W/mK. That's not a typo.

www.frostytech.com

What is Annealed Pyrolytic Graphite?

Annealed Pyrolytic Graphite is a high conductivity material made from a "unique form of pyrolytic graphite manufactured by the decomposition of a hydrocarbon gas in a high vacuum furnace (by Chemical Vapor Deposition - CVD)." (source: Scott L. Kugler). Why isn't everything made from this wonder material you ask? As you might guess, it's not quite as simple as swapping metal for Pyrolytic Graphite; while thermal conductivity in metals is not orientation specific, in APG thermal conductivity is very much orthotropic. What that means is APG material possesses extremely high thermal conductivity in its horizontal layers (a-axis, b-axis = 300-1700W/mK) and quite low thermal conductivity when moving from vertically from layer to layer (c-axis = 3.5-10W/mK).

www.frostytech.com
Text & image source: ECNMag.com

Writes ECNMag.com; "Annealed Pyrolytic Graphite (APG) is orthotropic and as such the direction of the thermal loading may also determine the thermal performance of the heat sink. The low through-the-thickness thermal conductivity of the APG can lower the effective thermal conductivity of the part when there is a thermal path normal to the plane of the APG. For most applications, this characteristic is small because the high in-plane conductivity of the APG quickly spreads the heat, thus lowering the thermal density (Q/A). At the reduced thermal density, the temperature rise through-the-thickness is significantly reduced. However, designs that require a high-flux density energy(>10w/cm2) heat path normal to the plane of the APG, the temperature rise can be significant."

Neat material, maybe one day soon it will trickle down to computer heatsinks...
FULL STORY @ THERMACORE
(http://www.thermacore.com/products/kcore.aspx)


News Archives by Category
» Audio / Sound » Beginners Guides » Benchmarks
» Biometrics » BIOS » Business / Industry
» Cases » Chipset » Computer / SFF PCs
» Cooling / Heatsinks » CPU / Processors » Digital Cameras
» Drivers » Editorial » Games
» Gossip » Hard Drives/SSD » Hardware
» Home Theatre » Imaging » Memory
» Mobile Devices » Monitors » Motherboards
» Mouse Pads » MP3 Players » Networking
» Notebooks » Operating System » Optical Drives
» Overclocking » Peripherals » Power Supply
» Press Release » Printers » Servers
» Site News » Software » Tips
» Tradeshows / Events » Video Cards » Web News
Follow Frostytech on FacebookFrostytech News RSS FeedFollow frostytech on Twitter
Resources
° Got Feedback?
° Mk.II Test Platform
° Where To Buy?
° Manufacturer Index
° Industry Dir.
° Cooling Projects

Scythe Ninja 4 SCNH-4000 Heatsink Review

DeepCool Maelstrom 240 Liquid Cooling System Review

DeepCool Gamer Storm Lucifer K2 Heatsink Review

Gelid Antarctica Heatsink Review

Noctua NH-D9L 3U Low Noise Heatsink Review

BeQuiet Shadow Rock LP Heatsink Review
...More Articles >>




Websites you may also like:
PCSTATS

Google Search Frostytech

Time stamped: 6:55AM, 11.21.2017
In Case You Missed it...
°  Scythe Mugen 5 Rev B SCMG-5100 Heatsink Review

°  Samsung to continue adopting heat pipes for smartphones in 2018

°  be quiet! Dark Base 700 Case Review

°  Cooler Master MasterBox Pro 5 Revealed

°  ARCTIC Freezer 33 eSports Edition CPU Cooler Review

°  Heatpipes to watercooler CPU Heatsink - DIY




FrostyTech.com
Since June 1999


Find a Heatsink / RSS Feeds
Latest Heatsink Reviews
Top 5 Heatsinks Tested
News RSS Feed
Reviews RSS Feed


Social Media
Facebook
Twitter
Pinterest


FrostyTech.com Info
Feedback
Contact Us / Heatsink Submissions
Submit News
Legal
Suite 66
© Copyright 1999-2017 www.frostytech.com All Rights Reserved. Privacy policy and Terms of Use
Images © FrostyTech.com and may not be reproduced without express written permission.
Current students and faculty of accredited Universities may use Frostytech images in research papers and thesis, provided each image is attributed.