The sintering process of conductive copper paste is a processing method used to prepare conductive copper layers. The following are the general steps of the sintering process for conductive copper paste:

Prepare the base:

1、 Preparation of conductive copper paste:

1. Choose substrate material: Select a suitable substrate material based on specific application requirements and preparation process requirements. Common base materials include ceramics, glass, polymers, etc.

2. Substrate cleaning: Before applying conductive copper paste, ensure that the substrate surface is clean and dust-free. Solvent, deionized water, or other cleaning agents can be used to clean the substrate to remove surface dirt and impurities.

3. Surface treatment: Conduct appropriate surface treatment based on the characteristics of the substrate material and the requirements for coating conductive copper paste. Common surface treatment methods include:

4. Mechanical grinding: Use grinding tools to grind the surface of the substrate to remove unevenness and oxide layers.

Plasma treatment: Using plasma treatment equipment to perform plasma cleaning or activation treatment on the substrate surface to increase surface activity and adhesion.

5. Surfactant: Apply a layer of surfactant on the substrate surface, such as copper sulfate, to improve the adhesion between the conductive copper paste and the substrate.

6. Chemical treatment: Using chemical treatment methods such as acid washing or acid leaching to surface treat the substrate to remove oxides and other contaminants.

7. Drying: Before applying conductive copper paste coating, ensure that the substrate surface is completely dry. Use hot air or other drying equipment to heat or blow the substrate to remove surface moisture and solvents.

8. Conductive copper paste coating: Apply conductive copper paste on the surface of the substrate. Printing, spraying, coating and other methods can be used for coating. Ensure uniform and appropriate thickness of conductive copper paste, and minimize the generation of bubbles or defects as much as possible.

2、 Coating conductive copper paste:

1. Prepare conductive copper paste: Prepare suitable conductive copper paste according to specific application requirements and preparation process requirements. Conductive copper paste is usually composed of copper particles, organic solvents, dispersants, and binders. Mix and stir these components to obtain a uniformly dispersed conductive copper paste.

2. Base surface treatment: Ensure that the base surface is clean and dust-free. According to the characteristics of the substrate material and the requirements of the conductive copper paste, appropriate surface treatments such as cleaning, grinding, plasma treatment, etc. should be carried out to improve the adhesion between the conductive copper paste and the substrate.

3. Printing: Using printing techniques such as screen printing or printing methods in printed circuit board manufacturing, conductive copper paste is coated onto a substrate through a mesh or mold.

4. Spraying: use spraying equipment to spray conductive copper paste on the substrate in the form of spray to achieve coating.

5. Coating: Use methods such as scraping, rolling, or brushing to evenly coat the conductive copper paste onto the surface of the substrate.

During the coating process, attention should be paid to controlling the thickness and uniformity of the coating to ensure the performance and stability of the conductive copper layer.

Drying: After the conductive copper paste coating is completed, it is dried to remove solvents and moisture. The specific method and parameters of drying need to be determined based on the composition of the conductive copper paste and the substrate material.

3、 Drying:

After coating the conductive copper paste onto the substrate, it needs to be dried to remove solvents and moisture, thereby forming a continuous conductive layer. The following are the general steps for drying conductive copper paste:

2. Ensure uniform coating: Before starting the drying process, ensure that the conductive copper paste is evenly coated on the substrate without any obvious uneven thickness or bubbles.

3. Natural drying: Place the coated conductive copper paste in a well ventilated environment and let it dry naturally. This step mainly involves evaporating the solvents and moisture in the conductive copper paste. Be careful to avoid exposure to excessively high temperatures to prevent uneven shrinkage or cracking of the conductive layer.

4. Heating and drying: For some situations that require faster drying, heating equipment can be used for drying. Hot air or heating plates can be used as heating sources to heat the conductive copper paste to a certain temperature, accelerating the evaporation of solvents and moisture.

Control drying temperature and time: When drying, it is necessary to control the drying temperature and time to ensure that the conductive copper paste is thoroughly dried without exceeding its thermal stability. The specific temperature and time depend on factors such as the composition of the conductive copper paste and the substrate material, and are usually guided in the process specifications.

5. Check the drying effect: After the drying is completed, inspect the conductive copper layer to ensure that there are no residual solvents or moisture, and that there is no uneven shrinkage or cracking.

The drying process of conductive copper paste needs to be carefully controlled to ensure the quality and performance of the conductive layer. Excessive temperature or inappropriate drying time may cause unevenness, cracking, or other adverse phenomena in the conductive layer. Therefore, in practical applications, it is recommended to optimize and adjust the drying process parameters based on the specific conductive copper paste and substrate material to achieve the best drying effect.

Finally, the prepared conductive copper layer is tested and inspected to ensure that it meets the specified conductivity and quality requirements.

It should be noted that the specific parameters and steps in the sintering process of conductive copper paste may vary depending on different applications and process requirements. Therefore, in practical applications, it is recommended to optimize and adjust the process according to specific situations to obtain the best performance of the conductive copper layer.