The Open UniversitySkip to content
 

High temperature reliability of power module substrates

Hamilton, Dean P.; Mills, Liam; Bowen, James; Jennings, Michael R. and Mawby, Philip A. (2015). High temperature reliability of power module substrates. In: PCIM Europe 2015, 19-20 May 2015, Nuremburg, Germany.

Full text available as:
[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (709kB) | Preview
URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?...
Google Scholar: Look up in Google Scholar

Abstract

The thermal cycling reliability of candidate copper and aluminium power substrates has been assessed for use at temperatures exceeding 300°C peak using a combination of thermal cycling, nanoindentation and finite element modelling to understand the relative stresses and evolution of the mechanical properties. The results include the relative cycling lifetimes up to 350°C, demonstrating almost an order of magnitude higher lifetime for active metal brazed Al / AlN substrates over Cu / Si3N4, but four times more severe roughening and cracking of the Ni-P plating's on the Al / AlN (DBA) substrates. The nonlinear finite element modelling illustrated that the yield strength of the metal and the thickness of the ceramic are the main stress controlling factors, but comparisons with the cycling lifetime results demonstrated that the fracture toughness (resistance) of the ceramic is the over-riding controlling factor for the overall passive thermal cycling lifetimes. In order to achieve the highest substrate lifetime for the highly stressed high temperature thermal cycled applications, the optimum solution appears to be annealed copper, brazed on to a thicker than normal or higher fracture toughness Si3N4 ceramic.

Item Type: Conference or Workshop Item
ISBN: 3-8007-3924-0, 978-3-8007-3924-0
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 46016
Depositing User: James Bowen
Date Deposited: 15 Apr 2016 12:51
Last Modified: 10 Nov 2016 18:19
URI: http://oro.open.ac.uk/id/eprint/46016
Share this page:

Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU