Metal powder sintered filter

What is a metal powder sintered filter element

The metal powder sintered filter element is made of selected spherical metal powder and sintered by a special process. It has good permeation filtration performance and high filtration precision, as well as certain strength and toughness. Compared with filters made of paper, copper wire mesh and other fiber cloth, the performance is superior, and it is easy to assemble, disassemble and clean. Common raw materials are stainless steel powder, bronze powder, nickel powder, titanium powder, superalloy powder, and other materials can be customized according to customer requirements.

Why choose metal powder sintered filter element

The metal powder sintered filter element is made of metal powder as raw material and is refined by a unique precision sintering process. It has the advantages of variable load capacity, high temperature resistance, rapid cooling and rapid heating resistance, good corrosion resistance, uniform pore size distribution, good air permeability, large flow rate, easy cleaning and backwashing, and can be cleaned and reused. Compared with filter elements made of other materials, It can operate stably in harsh environments and exert a stable filtration effect.

Product category

Basic parameters

Filtration precision: 0.45um-100um
Porosity: 28-45%
Air permeability: 0.02-20L/cm2minPa
Permeability coefficient: 1.0*10-5-7*10-3L/cm2·min·Pa
Temperature resistance: 280. C (wet state)

Specifications

Diameter (mm): 6, 8, 12, 16, 18, 20, 30, 35, 40, 50, 60, 70, 100, 130
Interface form: M6-30, 222, 226, 4 points, 6 points, one inch, flat pressure, other interfaces required by customers.

How the sintering process happens

Sintering refers to the process of reducing the surface of powder particles and reducing the void volume of powder or compact under certain external conditions and sintering temperature below the melting point of the main components. In fact, during the sintering process, a series of physical and chemical changes such as volatilization of additives, recovery and recrystallization of deformed particles, material diffusion, flow, dissolution, compounding and alloying between particles also occur.
The sintering process of powder or compact is a heat treatment process, which includes a heating process, an isothermal sintering process at the sintering temperature, and a subsequent cooling process. But the general sintering theory mainly studies the isothermal sintering process. The sintering process is divided into sintering neck formation stage, sintering neck growth and closed cell formation stage, closed cell reduction and spheroidization stage.
During the heating process and the initial stage of isothermal sintering, due to the volatilization of the adsorbed gas and additives in the green body, the oxides on the surface of the particles are reduced, the recovery and recrystallization of the deformed particles and the diffusion of atoms on the surface of the particles make the bonding between the particles change from coalescence. For crystal bonding, the points and faces of the particles are further enlarged to form sintered necks.
The atoms continue to migrate to the particle bonding surface, which further expands the sintering neck and further reduces the distance between particles. Due to the movement and expansion of the grain boundaries of the sintering neck, the grains begin to grow, and the shape of the particles also begins to change. Continue growing.

Main features of metal powder sintered filter element

1. High temperature resistance, resistance to rapid cooling and rapid heating, its good temperature resistance makes the disinfection of the entire equipment easier, for example, high temperature steam can be used to sterilize the whole system;
2. High filtration precision, stable pores, can effectively remove suspended solids and particles, etc., excellent filtration precision, and good separation, filtration and purification effect;
3. Good air permeability, small pressure loss, high porosity, uniform pore size, small initial resistance, easy backflushing, online regeneration, easy cleaning, strong regeneration ability, and long service life;
4. High mechanical strength, good rigidity, good plasticity, no need for external skeleton support protection, simple installation and use, convenient maintenance, good assembly, and can be welded, bonded and machined;
5. The pores are uniform, especially suitable for occasions with high uniformity requirements such as fluid distribution, homogenization treatment, and aeration;
6. No particles fall off, and do not cause secondary pollution of the original solution;
7. Good mechanical properties, low pressure difference, large flow rate, pressure filtration and suction filtration, and simple operation;
8. Good corrosion resistance, can be used stably in nitric acid, sulfuric acid, acetic acid, oxalic acid, phosphoric acid, 5% hydrochloric acid, molten sodium, liquid hydrogen, liquid nitrogen, hydrogen sulfide, acetylene, water vapor, hydrogen, carbon dioxide gas and other environments;
9. The forming process is good, and the overall length without welding can reach 1200 mm. Metal powder products can be formed at one time without cutting, the effective utilization rate of raw materials is high, and materials are saved to the greatest extent, especially suitable for components with large batches and complex structures;

Application field

Pharmaceutical industry: decarbonization filtration in the concentrated preparation of large infusions, small injections, eye drops, and oral liquids and security filtration before terminal filtration in the diluted preparation process; impurity removal filtration in the production process of raw materials, decarbonization of materials Filtration and fine filtration;
Water treatment industry: ultrafiltration, RO, EDI system security filtration in the water treatment industry, filtration after ozone sterilization; security filtration before reverse osmosis in the field of seawater desalination;
Food industry: clarification and filtration of beverages, fruit juices, liquor, beer, vegetable oil, mineral water, soy sauce and vinegar in food;
Chemical industry: Decarbonization filtration and precision filtration of liquid products, liquid raw materials, and pharmaceutical intermediates in the chemical industry, filtration and recovery of ultrafine crystals and catalysts, precision filtration after resin adsorption, and impurity filtration of system heat transfer oil and materials; dyestuffs Industrial high-temperature decarbonization and de-whitening filtration;
Petroleum industry: oilfield reinjection water filtration.

Application of metal powder sintered filter element in backwash filter

1. Less residual liquid.
According to the experience of nearly ten years, with the filter element and cleaning procedure, the cleaning effect is equivalent to more than 80% of the initial state. The service life of the filter is greatly extended, and pollutant emissions are reduced by 72%.
2. The filter element is made of metal powder sintered, so there is no need to replace the filter element frequently.
The metal membrane filter is a stainless steel powder unsintered filter element sintered by a special process, with high strength, high porosity and filtration efficiency up to 1 micron.
3. Fully enclosed structure, fully automatic, suitable for various complex explosion-proof occasions.
The metal microporous filter is equipped with various pneumatic or electric valves, which can realize the automatic filtering and cleaning process, reduce the hidden safety hazards caused by manual cleaning, and improve the production efficiency.
4. Mature system solution.
There have been many successful solutions for metal powder filters, the filtration flow is between 1-200t/h, and there are mature drawings to choose from.