Controlling Voiding Mechanisms in the Reflow Soldering Process

Published:

November 15, 2017

Author:

Keith Sweatman, Takatoshi Nishimura, Kenichiro Sugimoto, Akira Kita

Abstract:

While a significant level of voiding can be tolerated in solder joints where electrical conductivity is the main requirement, voiding at any level severely compromises thermal conductivity. For example, in LED lighting modules effective conduction of heat through the 1st level die attach to the substrate and then through the 2nd level attach to the heat sink is critical to performance so that voiding in the solder joints at both levels must be minimized. (...) In this paper, the authors will review the factors that influence the incidence of voids in small and large area solder joints that simulate, respectively, the 1st and 2nd level joints in LED modules and discuss mitigation strategies appropriate to each level. They will also report the results of a study on the effect on the incidence of voids of flux medium formulation and the optimization of the thermal profile to ensure that most of the volatiles are released early in the reflow process....

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Company Information:

Nihon Superior Co., Ltd.

Nihon has been a leader in soldering and brazing since 1966. Nihon manufactures SMT solder joining materials e.g. lead-free solder (SN100C:Sn-Cu-Ni-Ge etc): solder paste, solder spheres, flux cored solder wire, solder bar, etc.

Osaka, Japan

Manufacturer of Assembly Material, Soldering

  • Phone 81-(0)6-6380-1121
  • Fax 81-(0)6-6380-1262

Nihon Superior Co., Ltd. website

Company Postings:

(7) products in the catalog

(5) technical library articles

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