Study on erosion resistance characteristics of Fe-MWCNT composite plating with respect to lead-free solder

Watanabe, Jun; Sekimori, Norihisa; Hatsuzawa, Kenji; Uetani, Takashi; Shohji, Ikuo

doi:10.1088/1742-6596/379/1/012025

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…J. Watanabe et al examined the erosion resistance of Fe-MWCNT (Multi Wall Carbon Nanotube) composite in molten Pb-free solder alloy. They found that by applying the Fe-MWNT composite material the resistance against erosion was increased, but wetting was decreased [20]. Although this concept seemed to be promising, the applied composite material is rather costly and its production is complicated, therefore it might not offer a reasonable solution.…”

Section: J Min Metall Sect B-metall 54 (3) B (2018) 283 -290mentioning

confidence: 99%

Investigation of dissolution resistance of blank and gas-nitrided carbon steels in stationary SAC305 solder alloy melt

Benke

Salyi

Kaptay

2018

J min metall B Metall

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The objective of the present study is to investigate the suitability of a series of gas-nitrided steels with varying C content as candidates for wettable selective soldering tool materials with enhanced lifetime. ɛ and γ' iron-nitrides were formed by gas nitriding on quenched and tempered DC04, C45, CK60 and S103 type steels. Contact angle measurements revealed that all four nitrided steels exhibit good wetting with SAC305 solder melt. In order to investigate the dissolution reactions between the nitrided steels and the solder alloy, an equipment was assembled in which the samples were submerged into stationary SAC305 solder melt for different time durations. Evidences of dissolution reactions and other degradation processes were searched for using scanning electron microscopy and energy dispersive X-ray spectroscopy. It was observed that no Fe dissolution occurred between the samples and stationary SAC305 solder melt during continuous tests with durations up to 20 days. Furthermore, no other visible degradation reactions occurred between the samples and melt during the experiments. It was concluded that gas-nitrided steels show good wetting with Sn-based solder melts which is combined with excellent resistance against Fe dissolution in a high Sn-containing molten solder. Thus, gas-nitrided steels/iron can be potential materials for wettable selective soldering tools with improved lifetime.

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Section: J Min Metall Sect B-metall 54 (3) B (2018) 283 -290mentioning

confidence: 99%

Investigation of dissolution resistance of blank and gas-nitrided carbon steels in stationary SAC305 solder alloy melt

Benke

Salyi

Kaptay

2018

J min metall B Metall

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“…Their research showed that the resistance of the composite material increases, whereas the wetting of the surface by liquid SAC decreases, which is also an important parameter for the stability of the solder wave. [16] In addition, the production of the composite is much more expensive, and the cost-effective production of the tool is also an important aspect. Thus, the lifetime of the tool cannot be improved, or only to a negligible extent, by modifying the solder alloy with composite materials.…”

Section: Introductionmentioning

confidence: 99%

Boride Coatings on Steel Protecting it Against Corrosion by a Liquid Lead-Free Solder Alloy

Sályi

Kaptay

Koncz-Horváth

et al. 2022

Metall Mater Trans B

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The goal of this research is to study the applicability of the diffusion boriding process as a high-temperature thermochemical heat treatment to enhance the lifetime of steel selective soldering tools. The main purpose of the work is to discuss the behavior of double-phase (FeB/Fe2B) iron-boride coating on the surface of different steels (DC04, C45, CK60, and C105U) against the stationary SAC309 lead-free solder liquid alloy. The boride coating was formed on the surface of the steel samples through the powder pack boriding technique. The microstructure of the formed layer was examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The borided samples were first cut in half and then immersed into a stationary SAC309 lead-free solder liquid alloy (Sn–3Ag–0.9Cu) for 40 days. Microstructure examinations were performed by SEM with energy-dispersive spectroscopy and an elemental distribution map after the dissolution test. Excessive dissolution/corrosion of the original steel surface was observed at the steel/SAC interfaces, leading also to the formation of Fe–Sn intermetallic phases. This was found to be the major reason for the failure of selective soldering tools made of steel. On the contrary, no dissolution and no intermetallic compounds were observed at the FeB/SAC and at the Fe2B/SAC interfaces; as a result, the thicknesses of the FeB and Fe2B phases remained the same during the 40-day dissolution tests. Thus, it was concluded that both FeB and Fe2B phases show excellent resistance against the aggressive liquid solder alloy. The results of the dissolution tests show a good agreement with the thermodynamic calculations.

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“…It was confirmed that the erosion resistance of SAC305 was about 100 times greater than that of Fe alone when added to inexpensive and readily available multi-walled carbon nanotubes (MWCNTs). 7,8) In this study, we focused on boron nitride nanotubes (BNNTs), 912) which have a similar structure to MWCNTs. Compared to MWCNTs, BNNTs are chemically stable and are superior in terms of oxidation and heat resistance.…”

Section: Introductionmentioning

confidence: 99%

Erosion Resistance of Iron-Boron Nitride Composite Plating to Molten Lead-Free Solder

Watanabe¹,

Hatsuzawa²,

Ogata³

et al. 2022

Mater. Trans.

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In accordance with the EU RoHS Directive, the use of Sn3 mass%Ag0.5 mass%Cu lead-free solder (SAC305) has become the standard in the manufacturing of electronics. Since SAC305 contains more tin than the conventional tin-lead eutectic solder, erosion of the Fe plating frequently occurs on a hand soldering iron tip and a point soldering machine nozzle. In this study, to extend the life of the Fe plating layer, we investigated the applicability of a composite plating in which Fe is combined with the boron nitride (BN) compounds. We used BN particles as the bulk material, and boron nitride nanotubes (BNNT) as a nanomaterial, to fabricate the regarded composite materials. A solderability test and an erosion resistance test were conducted on the composite plating layer, made of both Fe-BN particles and Fe-BNNTs composites. In the solderability test, the spreading factor of SAC305 on the Fe-BN particle and on the Fe-BNNT composite platings were about the same as, or a little decreased compared to, that of the bare Fe plating. The SAC305 solder was not repelled by either composite plating. In the erosion resistance test, the Fe-BNNT composite plating performed the best, and had the lowest erosion depth. The erosion depths of the Fe-BN particle composite plating and the Fe plating ranged from about 6 to 24 times greater, respectively, than those of the Fe-BNNT composite plating layer, confirming that, in a nanomaterial BNNT-base, composite diffusion of Fe into SAC 305 can be suppressed.

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Study on erosion resistance characteristics of Fe-MWCNT composite plating with respect to lead-free solder

Cited by 5 publications

References 5 publications

Investigation of dissolution resistance of blank and gas-nitrided carbon steels in stationary SAC305 solder alloy melt

Investigation of dissolution resistance of blank and gas-nitrided carbon steels in stationary SAC305 solder alloy melt

Boride Coatings on Steel Protecting it Against Corrosion by a Liquid Lead-Free Solder Alloy

Erosion Resistance of Iron-Boron Nitride Composite Plating to Molten Lead-Free Solder

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