Influence of Electric Current at Solidification of Solder

Influence of Electric Current at Solidification of Solder

Does the electric current have any effect on the solder during solidification?
Our solders were used for further research. This time it was about Influence of Electric Current at Solidification of Solder.
The Department of Microelectronics at the Technical University in Brno is still conducting research and we are glad that our soldering materials can contribute to their testing.

This work deals with investigation of influence of electric current flow on the inner structure of solder alloy SAC305 during solidification. Methodology of this experiment was as follows:

  • Establishment of experimental melting station (Figure 1) constructed of quartz tube, resistance wire (heating element – Kanthal), electrodes (braze) and stage.
  • Verification of homogenous temperature distribution on quartz tube (Figure 2).
  • Melting of SAC305 solder alloy up to temperature 300 °C.
  • Solidification of solder WITH and WITHOUT electric current. Value of electric current was 7.5 A. Final sample had shape of cylindrical ingot.
  • After samples preparation, there were metallographic cross-sections done. Chemical wet etching was used for highlighting of inner structure.
Figure 1: Experimental melting station with possibility of connection of electrical current flow
Figure 2: Infrared thermograph of temperature distribution on the experimental melting station

Prepared samples were analyzed by SEM (Scanning Electron Microscope) and EDX (Energy Dispersive X-Ray). Results showed that sample without connected electric current during solidification had regular arrangement of β Sn dendrites (Figure 3 – SEM). On the contrary, sample with connected electric current during solidification showed greater disorder in β Sn dendrites grow (Figure 4 – SEM). Moreover, intermetallic parts from braze electrodes were dispersed in bulk solder of ingot in comparison to the sample without connected electric current (Figure 4 – EDX) where those intermetallic parts were observed only at the bottom side. These results are preliminary for the further research of this phenomenon.

Figure 3: Sample without electric current during solidification – SEM photo (left) and EDX photo (right)
Figure 4: Sample with electric current during solidification – SEM photo (left) and EDX photo (right)

The full paper is available at the link: https://ieeexplore.ieee.org/document/8810308

We thank the team from the University of Brno and look forward to further interesting tests of our soldering materials.

Influence of heat flow direction on solder ball interfacial layer

Influence of heat flow direction on solder ball interfacial layer

We always try to support the development and technical studies of universities. Now, as a supplier of solder balls and solder flux, we have joined the project: Influence of heat flow direction on solder ball interfacial layer.

During the soldering process, a large number of factors influence the quality of the solder joint. If we focus on the intermetallic layer and the intermetallic compounds for the SAC305 soldering alloy, some fundamental parameters influencing their formation and growth have been identified.

When supplying soldering materials, we often encounter testing of different proportions of impurities. We always try to help advise what ratio is ideal for a particular operation. Thanks to the fact that our production is in the Czech Republic, we can flexibly respond to the needs of our customers and supply soldering materials in a very short time.

The results of the solder-copper interface analysis showed different values in terms of the thickness of the intermetallic layer and its roughness. One of the basic parameters that could influence the test results was the soldering profile. For exact verification of the correct settings of the temperature profiles, a heating factor calculation was used to help optimize the soldering profile from the point of view of reliability control, repeatability, soldering process and quality of the resulting soldered joint.

More information can be found in the attached document, which relates to the work. Thank you for participating in this project.


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Příspěvek „The Quality of BGA Solder Joint with Underfill“ je chráněn heslem The Quality of BGA Solder Joint with Underfill

The Quality of BGA Solder Joint with Underfill

Brno, March 28th, Quality of NeVo SAC305 BGA solder joint with underfilled was studied by Brno University of Technology graduate student A.Otáhal.

The research study, supported by NeVo, is investigating mechanical behavior (shear strength) of soldered BGA package with and without underfill on FR4 and Al2O3 carriers.BGA soldered on FR4 (ENIG) had higher value of shear strength than BGA soldered on alumina substrate with conductive thick film layer. Results was used for validation of virtual model and simulation in ANSYS Workbench. This simulation will be used for prediction of thermomechanical behavior of BGA packages soldered on alumina substrates and on organic substrates FR4.

The full paper is available at the link here.

NeVo Solder

NeVo certified to ISO 9001:2015

NeVo confirms its high quality solder paste manufacturing standards by ISO 9001:2015 certification.

Solder paste and soldering products manufacturer and distributor NeVo® has made its Brno facility site certified by the latest ISO 9001:2015 standards.

“The successful qualification of NeVo company to the latest 2015 version of ISO 9001 standards is a confirmation of our key focus to deliver soldering products at the highest quality and technology level” said Daniel Pospisil, Technical Marketing Manager of NeVo.

The certificates in German, English and Czech languages are available here.

NeVo scores at solder paste vapour phase test

NeVo scores at solder paste vapour phase test

Solder paste and soldering products manufacturer and distributor NeVo® has achieved an „excellent“ scoring result of their lead-free solder paste product PF606-P30 at vapour phase assembly evaluation test performed by Exmore company.

The scoring included multiple parameter benchmarking evaluation including solderability, visual appearance and mechanical strength properties. The vapour phase technology is featuring high level safety for humans including low harmful inhalation risk.

The benchmarking was performed using the reference vapour phase liquid Galden LS230 with boiling point at 230 degrees Celsius.

“We are pleased with the achievement in this independent benchmarking test. Vapour phase assembly method is currently side of the mass volume assembly, but it may be important in some special applications. It is a high motivation for us to continue with our product development and services” said Daniel Pospisil, Technical Marketing Manager of NeVo.

NeVo Introduce New Low Viscosity Soldering Pastes

NeVo Introduce New Low Viscosity Soldering Pastes

NeVo is pleased to announce release of its new low viscosity solder pastes SnAg3.0Cu0.5 PF606-P214 and ultra low viscosity PF606-P214L.

The offer of lead-free, halide-free most favourite soldering paste PF606-P30 has been extended by its lower viscosity alternatives P214 and P214L.

” We react on customer feedback and needs for lower viscosity products, while maintaining excellent parameters of our standard P30 solder paste.” said Daniel Pospisil, NeVo Technical Manager

The new solder paste PF606-P214 is featuring low viscosity of 170Pa.s and the PF606-P214L even lower viscosity of 100Pa.s, while the standard PF606-P30 paste viscosity is 200Pa.s. PF606-P214L paste is also recommended for dispensing.

NEVO ATTRACTED SMT FAIR VISITORS

NeVo attracted SMT Fair Visitors

The NeVo® booth at the SMT Nuremberg (Apr 26-28,2016) reached a record level of interest from its end customers and distributors. The most attractive soldering products included special paste solutions for low temperature soldering, PoP and BGA spheres.

“We are pleased by such excellent interest and needs for our solder paste products. Our aim is to provide technical support and innovative solutions to the industry challenges, and the event was a great platform for such technical talks.” said Daniel Pospisil, NeVo’s technical marketing manager

“The measure of success is also our famous gray-silver “lead-free” coloured ice-cream served at the stand to passing-by fair visitors – It was used up just within two days.” add Daniel

Special Laser Soldering Paste Now Available

NeVo, the manufacturer and distributor of solder products is pleased to announce introduction of the new special solder paste type dedicated for laser soldering. The new solder paste PF606-P133H has been developed by Shenmao Technology and it is now available also on European market through distribution by its partner NeVo.

The PF606-P133H solder paste has been specifically designed for a selective laser soldering of miniature solder joints (sub 1.5mm), especially on the high cost, temperature sensitive components and PCBs.

Such small solder joints could not be specially formed during the reflow process and it had to be soldered manually until now. The new solder paste PF606-P133H enables formation of these sensitive solder joints by an automatic laser soldering process and thus it improves its reliability, process speed, variability & repeatability and reduce the overall costs. Just few seconds are sufficient, after solder deposition, to create uniform solder joint with minimum flux residues and no harmful effects such as spattering or solder beads spreading.

PF606-P133H is already qualified by leading electronic manufacturers worldwide.

For further information please get in touch with us at:

NeVo® Presentation Success at Amper

NeVo Presentation Success at Amper

The Amper trade fair visitors acknowledged the opportunity to meet NeVo® technical specialists. More then 180 attendees were listening to Dipl.Ing. Daniel Pospíšil’s presentation about the latest soldering trends during the DPS Industry Seminar.

The discussion about the solder features, benchmarking, selection guidelines, Q&A, etc. then continued after the seminar on face to face meetings. The visitors’ scorecard ackowledged NeVo® support with high ranking – 89 % were satisfied with the presentation, 71% recieved new information and 81% have got a new ideas for their work duties.

“We are pleased with the great feedback from the attendees. Our aim is to offer leading technical support, product knowledge and problem solving approach. More than 67% visitors of our seminar were industry engineers and 16% from universities per the seminar questionaire. Thus close to 90% satisfaction from the industry specialists is a result that we are proud of. Thank you to all participants and we are looking forward to see many of them next time again.” said Daniel Pospíšil, NeVo Technical Marketing Manager

Amper is the most respected and recognized trade fair of electronics and electrical engineering in Central Europe. DPS Seminar is a traditional co-event organised for Amper visitors by DPS trade magazine. It took place at the Brno Exhibition Trade Fair on March 15 to March 18th 2016.

NeVo®  presented its broad soldering product range portfolio together with its mother company AMTECH in a common booth stand.

nevo Brno

New manufacturing site opening

NeVo solder paste and soldering products manufacturer and distributor is pleased to announce the re-location of its manufacturing site from Wolfratshausen, Germany to Brno, Czech Republic effective 1st September 2015. „The new facility built in the technology center zone in Brno, Czech Republic is bringing new value to our customers in product quality and improvement of flexibility and lead times. The brand new facility in Brno is featuring a modern clean room with sufficient room for further manufacturing expansion while maintaining our high-quality standards.“ Said Serge Tuerlings, NeVo European sales manager. Customer service will stay in Germany in order to maintain our close relationship with local customers.