-
- News
- Books
Featured Books
- pcb007 Magazine
Latest Issues
Current IssueDon’t Just Survive, Thrive
If we are to be relevant and prosper during these next critical decades in electronics, we must do more than survive. As an industry, we can and must thrive. In this issue, our contributors explore these concepts meant to help you take your business to the next level.
Material Matters
Materials management is nuanced, multifaceted, and requires a holistic systems approach for business success. When building high mix, low volume, and high technology, managing materials and overall cost containment are even greater challenges.
Additive Manufacturing
In this month’s issue, we explore additive manufacturing technology for the PCB fabricator: where it stands today, the true benefits, and where it seems to be headed.
- Articles
- Columns
Search Console
- Links
- Events
||| MENU - pcb007 Magazine
Purdue Defense Research Focuses on Expanding Knowledge of Nontoxic Alternatives for Circuit Boards
November 10, 2022 | Purdue UniversityEstimated reading time: 3 minutes
Carol Handwerker’s life’s work is aimed at increasing reliability in everything from the largest Navy carrier to the family car. She does it by researching probably the most inconspicuous material: solder.
Handwerker, the Reinhardt Schuhmann Jr. Professor of Materials Engineering at Purdue University, has tested and researched materials for almost 30 years to determine the best options for solder that connects electronic components to circuit boards, focusing on almost any physical condition that a circuit board could encounter.
In today’s evolving era of microelectronics, green polymer circuit boards are among the most important factors. Without these functioning circuit boards – that can range from the size of a fist to a large photo frame – even a lot of the cars on the road today would stay parked.
“In today’s boards, there are so many interconnects,” Handwerker said. “There are thousands, if not millions, of solder joints in a single circuit board. If a solder joint fails, the system is compromised. So, it’s important that solder is reliable.”
Tin-lead solder was the mainstay for more than 50 years. But environmental and health concerns brought about the evolution of a new generation of solders that are lead-free and use alloys that are a better, nontoxic alternative to tin-lead.
One of more than 60 kinds of solder on the market today, tin-lead solder was banned by the European Union in 1999 for use in consumer electronics because of toxicity concerns. Handwerker, also a professor of environmental and ecological engineering at Purdue, was part of four years of research in the 1990s that preceded that ban, setting a baseline for possible replacement alloys. She worked closely with industry in the 2000s to transition to the new standard lead-free alloy for consumer electronics worldwide.
The only industries still exempted by the EU are defense, aerospace and implantable medical devices.
Handwerker’s current research is part of the U.S. Partnership for Assured Electronics (USPAE) and is backed by a $40 million U.S. Department of Defense contract. The work is in concert with defense companies and experts from the University of Maryland, Auburn University and Binghamton University and focuses on determining when lead-free solders might be as reliable or more so than tin-lead when used in defense systems.
“We’re providing options in a way that gives all of us confidence in our solder choices,” Handwerker said. “Solder is used in Department of Defense systems everywhere there are circuit boards, from handheld communication devices and battleships to helicopters and missiles. We are working to quantify how different lead-free solders behave in various highly demanding environments compared with tin-lead.”
Now in its second year, the five-year project has developed the first edition of the Solder User’s Handbook, which was recently approved by the Department of Defense. Handwerker said the project also is developing specifications and underlying scientific analysis allowing researchers to extrapolate to more extreme defense environments.
Handwerker is joined in her solder project by three other Purdue professors – Ganesh Subbarayan, professor of mechanical engineering; John Blendell, professor of materials engineering; and Nikhilesh Chawla, the Ransburg Professor of Materials Engineering – and Harvey Abramowitz, a professor of mechanical engineering at Purdue University Northwest.
As the inconspicuous glue that holds the components of circuit boards together, solder has a litany of microelectronics uses in Department of Defense vehicles and equipment. Jets face thermal cycling issues in which systems must function through high heat, then cold temperatures and back to high heat. Vibration and shock impact scenarios are shared by the solder used in circuit boards for planes, naval vessels and missiles.
Current experimentation at Purdue is focused on data analysis, solder reliability testing and process testing that confirms what the melting temperatures are for the solders. An in-depth testing plan is being developed.
Purdue is a national leader in microelectronics devices and packaging research, spanning the semiconductor ecosystem in software and hardware.
Purdue already has established excellence in key research areas considered critical to national security, including microelectronics. The area is among the critical topics under Purdue’s Next Moves, strategic initiatives that will advance the university’s competitive advantage.
A recent agreement with MediaTek, a leading global chipmaker, partnerships for future workforce development and the establishment of a semiconductor degrees program are the latest pieces of Purdue’s continually expanding research and development efforts in the field of microelectronics and semiconductors.
Here is more on Purdue’s leadership in the area of microelectronics.
Suggested Items
Altus Highlights Success of Essemtec's I2S in the UK and Ireland Market
07/23/2024 | Altus GroupAltus Group, a leading distributor of capital equipment for the electronics industry in the UK and Ireland, is pleased to highlight the success of Essemtec's Integrated Inspection System (I2S).
Automatic Paste Transfer and Quick Change Squeegee for ASMPT Printers
07/23/2024 | ASMPTASMPT, the market and innovation leader in SMT manufacturing technology, has added two new features to its proven DEK printing platforms that automate solder paste transfers and simplify squeegee changes.
New Breakthrough in Double-Sided Reflow Part Retention from Alltemated
07/19/2024 | AlltematedAlltemated's PLACE-N-BOND™ underfilm passed testing and was implemented in volume production to aid in component retention during the second pass reflow of printed circuit assemblies. This successful testing and implementation occurred in various applications with components such as capacitors, inductors, transformers, connectors, and larger ICs.
Book Excerpt: The Printed Circuit Assembler’s Guide to... Factory Analytics, Chapter 2
07/17/2024 | I-Connect007 Editorial TeamIn this chapter, we’ll focus on the most important analytics at the forefront of SMT, from the solder paste machine to placement machines, and breakdown these metrics from the perspectives of the different decision makers involved in the process. The lead SMT shift manager isn’t going to have the same concerns as a quality manager, so it’s important to look at how each machine and operation contains valuable KPIs for each role.
SMTA Heartland Chapter Announces Rescheduled Date for High Reliability: Virtual STAR Forum
07/10/2024 | SMTAThe SMTA Heartland Chapter announces the rescheduled date for the High Reliability: Virtual STAR Forum, following the overwhelming success of our May event. Join us on Tuesday, July 30, 2024, for an afternoon of engaging discussions and expert insights into high-reliability manufacturing.