banner
Solder paste formulation design process considerations

1,387 Published by FASTPCBA 11月 14,2019

PCB board solder paste formulation design process considerations

 

From an ideal process point of view, we hope that the pcb board solder paste flux system will maintain the ability to deoxidize and prevent oxidation before the solder melts, and will completely remove the oxide on the surface of the soldered metal when the solder melts. At the same time, it is desirable to have a minimum of active components remaining after soldering to ensure the environmental reliability of the solder joints. However, this ideal requirement is subject to changes in the degree of oxidation of the surface to be welded and the welding time, and it is actually difficult to achieve a state in which “the oxide is removed without the remaining active agent”. To this end, the formulation of the solder paste should be based on the design of a multi-component activator, and a multi-component solvent system is also adopted to ensure that the flux system continues to be active and the amount of residue is minimal.

 

Solder powder: If the automatic coating process wants to fluidize the solder material, the solder metal pcb board must be made into spherical particles. Solder powder is usually manufactured by a spray method, and the size and shape of the solder powder to be produced must meet certain pcb board requirements. Solder powders for the PCB electronics industry are classified according to their particle size. Since the surface assembly tends to be high-density and miniaturized, the size of the solder powder used is also getting smaller and smaller, and the main consideration is the tin permeation property of printing. The solder powder particle size currently in common use is type 4, which is commonly referred to as powder No. 4.

 

In order to promote good flow of solder paste during the printing phase, the solder powder particles must be spherical. Spherical particles also mean less oxide on the surface of the solder powder particles.

PCB manufacturer reflow soldering machine heating system

PCB manufacturer reflow soldering machine heating system   The full hot air and infrared hea...

Do you like ? 1,187

Read more
Types and advantages of flexible pcb circuit board

Types and advantages of flexible pcb circuit board The PCBA board is the finished product after t...

Do you like ? 1,308

Read more
What are the SMT process

What are the  SMT process Everyone knows that the electronic products we use in our lives are ass...

Do you like ? 2,859

Read more
What is the difference between PCB and PCBA

What is the difference between PCB and PCBA What is a PCB PCB = printed circuit board; PCB is an ...

Do you like ? 2,449

Read more
IATF16949

IATF16949 The most important function of automotive electronics is to improve the safety, comfort...

Do you like ? 2,386

Read more
ISO9001

ISO9001 ISO9001 quality management system is the foundation of enterprise development and growth....

Do you like ? 2,195

Read more
High-tech certification

High-tech certification The national high-tech enterprise certification is a comprehensive evalua...

Do you like ? 2,077

Read more
Gold supplier

Gold supplier     

Do you like ? 2,401

Read more