Symposium Conference Proceedings


Heatsink Adhesive Bonding Investigation

Authors: Smile Ling, Jim Bielick, Michk Huang, Wayne Zhang, Blue Wang, Xiaoyun Xia and Divas Liu
Company: IBM Corporation and Foxconn
Date Published: 4/17/2013   Conference: Symposium


Abstract: With the increasing usage of powerful ICs in Motherboard designs, heat dissipation of these high power ICs becomes more and more critical. Heatsinks provide an increasingly important role in dissipating the heat of these densely populated high power ICs. There are two common methods for fastening heatsinks to IC’s, mechanical attachment (such as spring clip, rivet, or screw connections), and adhesive bonding. Adhesive bonding has distinct advantages over mechanical methods, since it only uses the IC surface, and saves valuable area on the board for trace wiring and components, maximizing the space utilization on densely populated board designs. A good adhesive bond should have low thermal resistance, and provide strong, reliable attachment between a heatsink and IC during its life time. Meanwhile, a good adhesive bond process should be easily assembled on the production line, and easily disassembled as required for rework. Based on these requirements, a series of experiments has been conducted to investigate the key factors for good adhesive bonding. The investigation includes incoming heatsink material and surface finish, heatsink adhesive bonding process, and rework temperature impact on the as-bonded heatsink.

The conclusion from this paper will show how heatsink surface, pre-cure application force, load dwell time, activator contact time before weight application, adhesive pattern, and rework temperature influence heatsink performance after assembly.

Key Words: 

Heatsink adhesive, Key factor, Heatsink surface, Bonding process, Rework temperature



Members download articles for free:

Not a member yet?

What else do you get when you join SMTA? Read about all of the benefits that go along with membership.

Notice: Sharing of articles is restricted to just your immediate work group. Downloaded papers should not be stored on an external network or shared on the internet.


Back


SMTA Headquarters
6600 City West Parkway, Suite 300
Eden Prairie, MN 55344 USA

Phone +1 952.920.7682
Fax +1 952.926.1819