NDLI: A Study on Reliability of High-Temperature Joint in Packaging Structure

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ishikawa, Takayuki Oshidari, Toshikazu Sugihara, Hiromi Yu, Qiang
Copyright Year	2011
Abstract	In recent years, the research and development of hybrid cars and electrical vehicles become one of the top targets. High electric power is necessary for those cars to run in motor drive, and power devices such as inverter are employed for the control. Since operative temperature of Si power device is from −40 to 150°C level, a big cooling system is needed to control the temperature lower than 150°C. Recently the SiC chip had been developed to downsize the cooling system and reduce the loss of energy, because the operative temperature of SiC chip can be increased to over 300°C. However mounting method that can be used at high temperature environment is not established yet. The author’s group has proposed a new mounting method using Ag-Nano material to mount the SiC chip on a metal board. In existing mounting method, stress was relieved by transformation of comparatively soft solder region. Thus, in the new method, the junction Ag-Nano is too hard to relax the stress. So stress relaxation facility is given to the pure aluminum substrate side. In addition, jointing Ag-Nano on aluminum board is not possible, enabled by Ag and Ni plating on substrate. And these films prevent aluminum board from oxidizing. This mounting method achieves low temperature mounting and high reliability in thermal cycle. In this study, reliability of Ni plating was investigated because it was brought out that Ni plating becomes as a new weak point during high temperature cycle test ranged from −40 to 300°C. Mechanical properties of Ni plating were investigated first. Test specimens with plating and without plating for four point bending test were prepared to compare the difference. And stress-strain relation of plating was evaluated. In addition, fatigue strength was investigated by cyclic bending test. With these material properties, fatigue life of Ni plating in packaging structure was evaluated by finite-element-analysis. And optimum dimension of the structure was studied.
Sponsorship	Electronic and Photonic Packaging Division
Starting Page	45
Ending Page	51
Page Count	7
File Format	PDF
ISBN	9780791844618
DOI	10.1115/IPACK2011-52154
Volume Number	ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 1
Conference Proceedings	ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems
Language	English
Publisher Date	2011-07-06
Publisher Place	Portland, Oregon, USA
Access Restriction	Subscribed
Subject Keyword	Cycles Temperature Solders Aluminum Metals Cooling systems High temperature Electricity (physics) Energy dissipation Fatigue strength Industrial research Materials properties Junctions Low temperature Fatigue life Motor drives Relaxation (physics) Mechanical properties Dimensions Automobiles Hybrid electric vehicles Stress-strain relations Stress Nickel plating Packaging Plating Electric vehicles Finite element analysis Reliability
Content Type	Text
Resource Type	Article

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