Please wait, while we are loading the content...
Please wait, while we are loading the content...
Content Provider | IEEE Xplore Digital Library |
---|---|
Author | Xiran Su Haiping Luo Yang, D.G. |
Copyright Year | 2006 |
Description | Author affiliation: Dept. of Mech. Eng., Guilin Univ. of Electron. Technol. (Xiran Su; Haiping Luo; Yang, D.G.) |
Abstract | Interface delamination is one of the major failure modes in plastic IC packages. The encapsulating polymers used in electronic packaging are characteristic of high porosity, which makes the material susceptible to the moisture absorption. During reflow soldering process, the entire package is exposed to the soldering temperature as high as 260degC for lead-free solders. Under such temperatures, moisture absorbed by polymer materials evaporates, generating high internal vapor pressures in the voids. Interface delamination may be caused by the combined effect of the thermomechanical stress, hygromechanical stress and vapor pressure. The main objective of this paper is to investigate the effects of temperature, moisture diffusion and vapor pressure on the delamination in lead-free QFN package during SMT reflow soldering process. Finite element simulation on a plastic QFN package is carried out for the entire thermal and moisture history from the JEDEC Level 1 moisture preconditioning (85degC/85%RH for 168 hours) to subsequent exposure to a lead-free soldering process. The energy release rate due to thermal stress, hygro-stress and vapor pressure is computed and studied by using J-integral method. The result shows that the additional mismatch induced by the vapor pressure and moisture in the package is of the same order as the CTE mismatch, which has a quite significant effect on interfacial delamination failure |
Starting Page | 1 |
Ending Page | 6 |
File Size | 6582434 |
Page Count | 6 |
File Format | |
ISBN | 1424406196 |
DOI | 10.1109/ICEPT.2006.359847 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2006-08-26 |
Publisher Place | China |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Moisture Delamination Environmentally friendly manufacturing techniques Lead Surface-mount technology Reflow soldering Electronic packaging thermal management Thermal stresses Temperature Plastics |
Content Type | Text |
Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
Sl. | Authority | Responsibilities | Communication Details |
---|---|---|---|
1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
Loading...
|