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SMTnet Express February 28, 2013, Subscribers: 26214, Members: Companies: 13305, Users: 34373

Technical Library

Effect of Cooling Rate on the Intermetallic Layer in Solder Joints

While it has long been known that the Cu6Sn5 intermetallic that plays a critical role in the reliability of solder joints made with tin-containing alloys on copper substrates exists in two different crystal forms over the temperature range to which electronics circuitry is exposed during assembly and service, it has only recently been recognized that the change from one form to the other has implications for solder joint reliability. (...)

In this paper the authors report a study of the effect of cooling rates on Cu6Sn5 crystals. Cooling rates from 200°C ranged from 10°C/minute to 100°C/minute and the effect of isothermal ageing at intermediate temperatures was also studied. The extent of the phase transformation after each regime was determined using synchrotron X-ray diffraction. The findings have important implications for the manufacture of solder joints and their in-service performance.

by: Keith Sweatman, Tetsuro Nishimura, Stuart D. McDonald, Kazuhiro Nogita; Nihon Superior, University of Queensland, Brisbane, Australia

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Forum search results for related keywords: solder joint, intermetallic, Cu6Sn5

SMT / PCB Products

iico Pick & Place System (new!)
iico Pick & Place System

For the latest electronic production needs...

by: Europlacer

NanoClear®
Stencil Wipes

The best in class stencil treatment technology...

by: Aculon

AQUANOX® A4241
Aqueous Cleaning... AQUANOX A4241

Works on all the latest flux formulations; even Lead-Frees...

by: Kyzen

SP700avi
Stencil Printer
SP700avi Inline Stencil Printer

Utilising the most advanced drive...

by: Speedprint

EXCEN High Speed
Modular Mounter
EXCEN High Speed Modular Mounter

World's highest area productivity...

by: SAMSUNG

Mark5 Series -
Reflow System
The Mark III Reflow System

Up to 40% reduction in nitrogen consumption...

by: Heller

SMT / PCB Equipment Auctions

X-Line Electronic Equipment Auctions

DOLBY - Surplus SMT, Test and Process Equipment to Ongoing Operations

March 4 - 5

auction by: X-Line Asset Management

Electronic Equipment Mart

Heller 1088EXL
Reflow Oven
Heller 1088EXL Reflow Oven

IBE SMT Equipment

all marketplace listings

DEK 248CE
Screen Printer
DEK 248CE Semi-Auto Screen Printer

PPM

all marketplace listings

Air-Vac Onyx25 xLT
Rework Station
Air-Vac Onyx25 xLT Rework Station

SMT Trader

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Panasonic CM-402L A
Chipshooter...
Panasonic CM-402L A SMT Placement

CE Exchange

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Events Calendar

Electronics South - Trade Show, Conference
March 6-7

Dallas Expo & Tech Forum
March 12-13

Career Center

Jobs:

Equipment & Repair Technician

Suwanee, GA, USA | ASM Assembly Systems

Senior Customer Service Engineer

Tampa, FL, USA | EUROPLACER

Field Service Engineer, North America

Can be flexible... | MatriX Technologies

Resumes:

Process Engineer

San Diego, CA, USA

Electronic Process Engineer

Brampton, Orlando, Canada

SMT Process Engineering Specialist

Kitchener, Ontario, Canada

Industry Associations Events

SMTA

SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore

Next Event: SMTA Webtorial DfM: Challenges & Opportunities - March 14 & 21


IPC

IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: IPC/FED Conference on Embedded Components - June 4 - 5


Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard

SMTnet.com, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

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