Wettability optimization analysis of lead-free solders with Taguchi method

Abstract

In this paper, the wettability of lead-free solders on substrates with fluxes was studied based on reflow process and Taguchi method. Effects of different control factors, including solder materials, fluxes, substrate materials and atmosphere on the wettability of the lead-free solder joints were examined and calculated. Moreover, the effect of rare earth Eu on the wetting of SnAgCu solder was investigated, the effect mechanism was analyzed too. The wettability optimal design in the lead-free solders system has the combination of the SnAgCu-0.04Eu solder, RMA flux, Au/Ni/Cu substrate, and vacuum atmosphere. Moreover, the flux is the most important factor among the control factors in the wettability system.

Analysis of the parameters affecting the surface sanding of Pinus elliottii and Corymbia citriodora wood species

“…Because of the large number of factors present in the sanding process related to the wood, sandpaper, and machines, it is necessary to apply an experimental planning method to minimize the number of experimental conditions that need to be investigated. The Taguchi method provides such an approach (Zhang et al 2015). According to Hamzaçebi (2016) the Taguchi method is an effective and robust experimental design technique that determines the most important factors and their impact on the optimization of process parameters through the reduction of number of experiments performed.…”

Preparation of brookite TiO2nanoparticles with small sizes and the improved photovoltaic performance of brookite-based dye-sensitized solar cells

“…[13][14][15][16][17][18][19] One of the reasons is the difficulty in obtaining pure brookite since it is a thermo-dynamically metastable form with a relatively lower symmetry and higher surface energy, which cause the brookite formation to be usually accompanied by a secondary phase such as anatase and/or rutile. 13,14,[20][21][22] In 1966, Keesmann 23 was the first to prepare pure brookite through the hydrothermal treatment of amorphous TiO 2 obtained by hydrolysis of titanium tetraisopropoxide in the presence of NaOH solution, in which Na + ions were considered to stabilize the brookite lattice. Similarly, Mitsuhashi and Watanabe 24 found that brookite can be obtained through the hydrothermal treatment of a fresh coprecipitate prepared from TiCl 4 and CaCl 2 solution.…”