Adhesion and Puncture Strength of Polyurethane Coating Used to Mitigate Tin Whisker Growth

Author:

Mahan Kenny1,Sun Yong1,Han Bongtae2,Han Sungwon1,Osterman Mike1

Affiliation:

1. Mechanical Engineering Department, Center for Life Cycle Engineering, University of Maryland, College Park, MD 20742

2. Fellow ASME Mechanical Engineering Department, Center for Life Cycle Engineering, University of Maryland, College Park, MD 20742 e-mail:

Abstract

Reliability of conformal coatings used to mitigate tin whisker growth depends on their ability to contain tin whiskers. Two key material properties required to assess the reliability of a polyurethane coating are documented experimentally: adhesion strength and puncture strength. A modified blister test using a predefined blister area is employed to assess the adhesion strength and a puncture test is employed to evaluate the puncture strength of the coating. After measuring the properties at time zero, the coatings are subjected to accelerated testing conditions (high temperature/humidity storage and temperature cycling) and the degradations of the coating properties are documented.

Publisher

ASME International

Subject

Electrical and Electronic Engineering,Computer Science Applications,Mechanics of Materials,Electronic, Optical and Magnetic Materials

Reference21 articles.

1. Filamentary Growths on Metal Surfaces—Whiskers;Corrosion,1951

2. Tin Whisker Test Method Development;IEEE Trans. Electron. Packag. Manuf.,2006

3. Annotated Tin Whisker Bibliography and Anthology;IEEE Trans. Electron. Packag. Manuf.,2005

4. Mitigation Strategies for Tin Whiskers,2002

5. Fox, W., and Woody, L., 2010, “Conformal Coatings for Tin Whisker Risk Management,” IPC APEX EXPO Technical Conference, Las Vegas, NV, April 6–9, pp. 890–920.

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