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Industry news

How to correctly control the thickness and uniformity of sintered gold paste coating?

Time:2024-10-08Number:827

Sintered gold pasteCoating technology is widely used in various fields such as electronic packaging, semiconductor manufacturing, ceramic metallization, etc. The thickness and uniformity of its coating directly affect the performance and reliability of the product. This article will explore in detail how to correctly control the thickness and uniformity of sintered gold paste coating from the aspects of pre coating preparation, coating process control, and sintering condition optimization, and cite relevant experience and data from Advanced Institute (Shenzhen) Technology Co., Ltd. and Research Platinum brand products.

Preparation before coating

Base surface treatment

Ensuring a clean and smooth substrate surface is a prerequisite for controlling coating thickness and uniformity. Oil stains, impurities, or uneven roughness on the surface can seriously affect the adhesion between the gold paste and the substrate, thereby affecting the coating effect. By using methods such as chemical cleaning and mechanical polishing to treat the substrate surface, impurities can be removed and the flatness can be improved, creating favorable conditions for gold paste coating.

Reference data: Compared with untreated substrates, substrates treated with chemical cleaning and mechanical polishing can increase the adhesion of gold paste by more than 30%.

Selection and treatment of gold paste

Choosing the appropriate sintered gold paste is crucial for controlling coating thickness and uniformity.Yanbo brand sintered gold pasteWith its high welding performance, good adhesion, and stable circuit connection performance, it enjoys a good reputation in the market. Before use, it should be ensured that the gold paste is stirred evenly without sedimentation or clumping.金浆

Coating process control

Selection of coating method

The coating method directly affects the uniformity of the distribution of gold paste on the substrate. Common coating methods include brush coating, spray coating, dip coating, and screen printing. Brush coating is suitable for substrates with small areas and complex shapes, but it is necessary to maintain uniform brush pressure; Easy spraying operation, controllable thickness, suitable for large-area substrates; The speed and time of immersion coating need to be controlled to avoid excessive or uneven gold paste; Screen printing is suitable for flat and regularly shaped substrates, and can achieve high-precision coating.

Comparison of experimental data:

  • Brushing: Under the same conditions, the uniformity error of skilled workers' brushing is within ± 5%, but the efficiency is relatively low.
  • Spraying: Use a spray gun to spray within a range of 200-300mm from the substrate, with a uniformity error controlled within ± 3% and high efficiency.
  • Dip coating: If the dip coating speed is too fast or too slow, it will cause uneven thickness. The optimized dip coating process can control the uniformity error within ± 4%.

Real time monitoring and adjustment

It is crucial to use optical detection equipment and other means to monitor the thickness and uniformity of the coating in real-time during the coating process. Once uneven thickness or non-compliance with requirements is found, coating parameters such as spraying pressure, brushing speed, etc. should be adjusted immediately to ensure coating quality.金浆

Optimization of sintering conditions

temperature control

The temperature control during the sintering process directly affects the bonding strength between the gold paste and the substrate, as well as the uniformity of the coating. Adopting a sintering furnace with uniform heating function to ensure uniform temperature distribution inside the furnace and avoid uneven coating caused by local overheating or undercooling. Meanwhile, based on the characteristics of the gold paste and the substrate material, select the appropriate sintering temperature and time to achieve the desired coating effect.

Reference data:Yanbo brand sintered gold pasteAt the recommended sintering temperature, the bonding strength with the substrate can reach over 30MPa, and the coating uniformity is good.

Atmosphere control

Proper atmosphere control during the sintering process can also help improve the uniformity and quality of the coating. For example, sintering under an inert atmosphere can prevent the gold paste from oxidizing at high temperatures, thereby improving the conductivity and corrosion resistance of the coating.

conclusion

Correctly controlling the thickness and uniformity of sintered gold paste coating requires starting from multiple aspects such as preparation before coating, control during coating process, and optimization of sintering conditions. By selecting appropriate substrate treatment methods, gold paste, and coating methods, using real-time monitoring and adjustment methods, and optimizing sintering conditions, high-quality sintered gold paste coating can be achieved. Advanced Institute (Shenzhen) Technology Co., Ltd. and research platinum brand enterprises have accumulated rich experience and data in this field, providing valuable reference and inspiration for the industry.

The above data is for reference only, and specific performance may vary due to production processes and product specifications.
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