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1 – 10 of 29

Abstract

Details

Circuit World, vol. 38 no. 4
Type: Research Article
ISSN: 0305-6120

Article
Publication date: 9 February 2010

Emma L. Smith, Andrew P. Abbott, Jason Griffin, Robert C. Harris, Cecil O'Connor and Karl S. Ryder

The purpose of this paper is to present the optimisation of protocols for the immersion coating of silver onto copper‐track printed circuit board (PCB) assemblies, using a novel…

Abstract

Purpose

The purpose of this paper is to present the optimisation of protocols for the immersion coating of silver onto copper‐track printed circuit board (PCB) assemblies, using a novel class of ionic liquid and to show the implementation of the scale up process.

Design/methodology/approach

Various conditions (temperatures and silver concentrations) are studied individually under laboratory conditions and then optimised for a pilot scale demonstrator line that is used to process British Standard test coupons.

Findings

The use of these novel liquids for the immersion coating of silver produces silver dip coatings that are bright and even and which give solderability that is as good as the commercial aqueous, nitric acid based, electroless process without any solder‐mask interface etching.

Research limitations/implications

The combined technology has been optimised for an immersion silver coating line. Further development work should be undertaken to tailor the technology for gold immersion coating of PCB assemblies.

Originality/value

The paper details a process in which no solder‐mask interface etching is observed; that does not require the use of strong inorganic acids or expensive catalysts to sustain deposition and which does not appear to be light sensitive in contrast to other processes.

Details

Circuit World, vol. 36 no. 1
Type: Research Article
ISSN: 0305-6120

Keywords

Article
Publication date: 3 February 2012

Andy Ballantyne, Greg Forrest, Martin Goosey, Asta Griguceviciene, Jurga Juodkazyte, Rod Kellner, Aleksandr Kosenko, Rimantas Ramanauskas, Karl Ryder, Algirdas Selskis, Rima Tarozaite and Erik Veninga

The purpose of this paper is to detail progress on the European Commission supported FP7 ASPIS project that is undertaking a multi‐faceted approach to develop novel and improved…

Abstract

Purpose

The purpose of this paper is to detail progress on the European Commission supported FP7 ASPIS project that is undertaking a multi‐faceted approach to develop novel and improved nickel‐gold (ENIG) solderable finish chemistries and processes in order to overcome issues such as “black pad” that are known to cause reliability issues.

Design/methodology/approach

The ASPIS project has four key and discrete approaches; research into “black pad” formation mechanisms, development of new aqueous chemical deposition methods, formulation of new processes based on ionic liquids and the development of prognostic screening tools to enable early prediction of reliability issues.

Findings

Key factors influencing “black pad” formation include immersion gold bath pH value, concentration of citrate and thickness of the immersion gold layer. In addition, copper substrate preparation is also important. Work to develop new metal deposition processes using ionic liquids has also been demonstrated and may provide a viable alternative to more conventional aqueous based chemistries, thereby enabling some of the conditions that lead to “black pad” to be avoided.

Research limitations/implications

This paper summarises the work carried out in the first year of a three‐year project and so the outputs to date are relatively limited. The project is continuing for another two years, when further progress will be made. It is hoped to report this progress in a future update paper.

Originality/value

The ASPIS project has undertaken multiple approaches to the development of new high reliability nickel gold finishes and this combination of approaches should offer synergies over more discrete traditional methodologies. As well as undertaking a detailed analysis of the mechanisms causing reliability problems, radical new formulation and prognostic approaches are also being developed.

Content available
Article
Publication date: 21 June 2013

141

Abstract

Details

Soldering & Surface Mount Technology, vol. 25 no. 3
Type: Research Article
ISSN: 0954-0911

Abstract

Details

Circuit World, vol. 36 no. 2
Type: Research Article
ISSN: 0305-6120

Content available
Article
Publication date: 15 May 2009

Pete Starkey

338

Abstract

Details

Circuit World, vol. 35 no. 2
Type: Research Article
ISSN: 0305-6120

Content available
Article
Publication date: 18 November 2013

148

Abstract

Details

Circuit World, vol. 39 no. 4
Type: Research Article
ISSN: 0305-6120

Book part
Publication date: 7 September 2008

Pavel Osinsky

This chapter examines why the political collapse of Russia and Germany in the end of the First World War resulted in massive expropriation of private property in Russia and…

Abstract

This chapter examines why the political collapse of Russia and Germany in the end of the First World War resulted in massive expropriation of private property in Russia and consolidation of private property in Germany. This historical divergence is explained by the different measure of coercive capacities of the provisional governments and, consequently, their different ability to withstand the assault of the radical Left during the periods of turbulent political transitions. The measure of coercive capacities was determined primarily by support of the army, which, in turn, was contingent upon the provisional governments’ decisions to negotiate peace and exit the war.

Details

Political Power and Social Theory
Type: Book
ISBN: 978-0-76231-418-8

Article
Publication date: 1 July 1996

David C. Wyld

This paper examines the potential relationship between the history of American generations and the development of American management thought. The paper reviews the recently…

Abstract

This paper examines the potential relationship between the history of American generations and the development of American management thought. The paper reviews the recently developed generational theory of American history, along with the generational concept itself. Then, the leading thinkers in the history of the management discipline are classified according to their generational membership. The potential theoretical and research implications of the interplay of managerial and historical generations are then discussed.

Details

Management Research News, vol. 19 no. 7
Type: Research Article
ISSN: 0140-9174

Article
Publication date: 1 September 1999

Ansgar Weymann, Reinhold Sackmann and Matthias Wingens

Outlines the experiences of East Germany as unification takes place. Presents the findings of a study analysing three groups of East Germans in their transitions from education to…

Abstract

Outlines the experiences of East Germany as unification takes place. Presents the findings of a study analysing three groups of East Germans in their transitions from education to employment and subsequent careers from 1985 onwards. Suggests that the findings indicate that changes in macro structure and life courses are closely interrelated. Covers mobility, unemployment, retraining, competition, fertility rates and coping strategies.

Details

International Journal of Sociology and Social Policy, vol. 19 no. 9/10/11
Type: Research Article
ISSN: 0144-333X

Keywords

1 – 10 of 29