How to operate the sintering process for metal sintered mesh filter cartridge

Raw material preparation:
Choose suitable raw materials, such as metal powder, polymer particles, or ceramic materials, and select the appropriate materials according to the requirements and applications of the filter element.
After preparing the raw materials, it may be necessary to mix the raw materials, powders, particle size distribution, and possible binders in a certain proportion to form a uniform paste.
Feed in molding:
If the raw material is powder or granular, it may need to be crushed and ball shaped to form spherical particles. Use a pressing machine to press and shape the raw materials into green blanks of the desired shape (unsintered filter elements). This can be achieved through methods such as injection molding, extrusion molding, and compression molding.

Dry:
The formed green billet needs to undergo a drying process to remove moisture from it. This is usually dried through air or baking chambers.

sinter:
Place the dried green billet in a high-temperature furnace for sintering. The sintering process is to heat the material to a high temperature, causing the material particles to bond together and form a sturdy filter structure.

During the sintering process, the following steps may be required:

Vacuuming: Start the vacuum device to remove the air inside the sintering chamber and the gas attached to the pressure block. Usually, it is necessary to evacuate the second stage to 1.3 × 10 ^ -2 Pa (or depending on the specific situation).

Heating and degassing: The furnace continues to pump at a temperature of 400-500 ℃ through electric heating, reducing the residual stress of the pressure block and gradually decomposing and evaporating the gas adsorbed inside and outside the pressure block, as well as the organic media such as lubricants and granulation agents added during the compression molding process.

Filling with argon gas: In order to sinter under a protective atmosphere, the sintering chamber is filled with argon gas at this time.

Heating to sintering temperature: Determine and control the sintering temperature according to the different materials. Excessive temperature may cause product softening and deformation, while too low temperature may prolong sintering time and reduce equipment utilization.

Insulation: Maintain the sintering temperature for a period of time to fully carry out processes such as densification, pore shrinkage, and crystal transformation of the green body.

Cooling and processing:After sintering is completed, the filter element needs to be cooled. The cooling rate has an impact on the performance of the product, so the cooling rate should be controlled to maintain the sintered phase structure. Surface treatment such as plating or coating may also be necessary to enhance the performance of the filter element.

Cutting and shaping:
The filter element may need to be cut and shaped to obtain the desired size and shape.

Performance testing and packaging:
The produced filter cartridge needs to undergo performance testing to ensure that it meets specifications and quality standards. After passing the test, the filter element is usually packaged for transportation and storage.