Aluminum oxide thermal conductivity

Aluminum Oxide (Al2O3) is an important ceramic for the electronics industry. Besides its use as a passivation layer on Silicon, the ceramic is often used as a carrier for thick and thin film passive components and for other small printed circuit boards. A relatively low cost is combined with a relatively high thermal conductivity, especially when compared to FR4 board material. Other ceramics such as Beryllium Oxide and Aluminum Nitride feature a much higher conductivity, but at a much higher price. Hence, the thermal conductivity of Al2O3 is of much interest to a designer. However, a word of caution should be issued. The use of values taken from some general list which often accompanies popular articles on electronics cooling is not recommended. The reason becomes clear when taking a closer look at the graph, showing the thermal conductivity as a function of temperature, with the impurity of the ceramic as a parameter. It is obvious that the values are highly sensitive to both temperature and impurity level, making the representation by one value only very doubtful.

Oettinger, Solid State Technology, Feb. 1984

In other words, it pays to trace the source of your Al2O3, and also to use a temperature-dependent relationship if the software allows such. If the software doesn’t, take the value at the estimated operating temperature, never at the room temperature value which is most often quoted in the ‘Most Important Electronic Material Thermal Data for Electronic Designers’ survey table.

Read electro-mechanical engineering blog
You might also like
Global Aluminum Oxide Plate Industry 2015 Market Analysis
Global Aluminum Oxide Plate Industry 2015 Market Analysis ...
Gardner Bender Gardner Bender OX-800 Ox-Gard Anti-Oxidant Compound, 8 oz Tube
BISS (Gardner Bender)
  • The perfect safeguard for aluminum-to-aluminum, aluminum-to-copper wire connections and aluminum conduit joints.
  • Guards against oxidation.
  • Improves conductivity; penetrates aluminum oxide to maintain inter-strand and inter-conductor current paths.
  • Produces a cooler connection.
MG Chemicals MG Chemicals 832TC Thermally Conductive Epoxy Encapsulating and Potting Compound, 16 oz Kit, Black
BISS (MG Chemicals)
  • Excellent electrical and thermal conductivity
  • Easy 1:1 mix ratio
  • Strong water and chemical resistance to brine, acids, bases, and aliphatic hydrocarbons
  • Suitable for large production runs
  • Excellent machining properties
Arctic Silver Arctic Silver Arctic Alumina Thermal Adhesive 5 Gram 3.5cc RoHS Compliant Two Tube Set With Mixing Wand
PC Accessory (Arctic Silver)
  • Arctic Alumina Adhesive uses a layered composite of aluminum oxide and boron nitride.
  • Arctic Alumina Adhesive is a pure electrical insulator, neither electrically conductive nor capaciti
  • A set of Arctic Alumina Thermal Adhesive consists of two tubes containing a total of 5 grams
MG Chemicals MG Chemicals 8616-25ML Cream Super Thermal Grease II, Silicone Free and Non Bleeding, 1 oz, Jar
BISS (MG Chemicals)
  • Contains no silicone or other metal particles, non-bleeding
  • Lowers the contact resistance between irregular surfaces
  • Maximum operating temperature of 150 °C / 302 °F
  • High dielectric strength, Extends the life of electronic components
Sure Electronics 36*22mm Round Oxidation Sunflower Aluminum Heat Sink for 1W 2W 3W LED Lamp
PC Accessory (Sure Electronics)
  • 1W LED Star: 30℃
  • Heat Sink for 1W 2W 3W LED
  • Thermal Compound
  • M2mm Screw
Related Posts