Sintered metal filters include sintered metal powder, sintered metal fiber. Those are mainly made of high-end metal substrates such as 316L stainless steel, titanium alloy, nickel-based alloy (Inconel‌^® 600/625), Hastelloy^®, Monel^® alloy, etc., manufactured through molding, layering, high-temperature vacuum/protective atmosphere sintering, and integrated metallurgical forming processes.

With core characteristics of high-precision filtration, high temperature and pressure resistance, corrosion resistance, repeated regeneration, no fiber shedding, and no secondary pollution, they are suitable for high-strict, cleanliness, safety working conditions such as new energy lithium batteries and nuclear industry. They are key filtration elements for precision fluid filtration, gas purification, and powder recovery.

Core Product Technical Features

This series of filters are different from traditional filtration elements such as PP, PTFE, and ordinary woven meshes. Their core performance advantages adapt to extreme industrial working conditions. The specific technical features are as follows:

• Precise and stable filtration performance: controllable pore size range 0.1–100 μm, porosity 30%–80%. With constant filtration accuracy, no fiber shedding, can strictly control trace impurities in the medium, eliminate secondary pollution, and meet high-end material production and nuclear safety cleanliness standards.

• Ultra-high mechanical structural strength: integrated metallurgical structure, no splicing gaps, no loose structure, pressure resistance up to 2–20 MPa, impact resistance, vibration resistance, not easy to deform or break, suitable for continuous production line operation, high-frequency working conditions such as high-pressure backwashing.

• Wide-range temperature adaptability: 316L stainless steel can withstand long-term high temperature of 550℃, titanium alloy 300℃, nickel-based alloy can adapt to up to 800–900℃ working conditions, and can stably operate in high-temperature gas, high-temperature slurry, high-temperature coolant and other medium environments.

• Strong corrosion resistance and radiation resistance: titanium alloy, nickel-based, Hastelloy^® , Monel^® materials can resist strong acid, alkali, organic solvent corrosion; nuclear-grade nickel-based materials have excellent radiation resistance and stress corrosion resistance, suitable for radioactive special working conditions.

• Repeated regeneration, low operation and maintenance cost: after blockage (with high pressure difference), it can be regenerated by online backwashing, ultrasonic cleaning, chemical cleaning, high-temperature baking and other methods. The filtration performance recovery rate after regeneration can reach more than 90%. The service life in conventional working conditions is 3–5 years, and in nuclear-grade working conditions it can reach more than 10 years, greatly reducing consumable replacement and downtime operation and maintenance costs.

1. Application in New Energy Lithium Battery Carbon-Silicon Anode Field

As the core material of high-energy-density lithium batteries, carbon-silicon anode has extremely high requirements for cleanliness, atmosphere stability, and temperature working conditions during the entire production process. Trace metal impurities, powder agglomeration, and furnace dust will directly lead to battery self-discharge, capacity attenuation, pole piece defects and other problems. Sintered metal filters are fully suitable for the core sections of the entire carbon-silicon anode preparation process.

1.1 Specific Application Sections

• Precision filtration of anode slurry (core section): after mixing and grinding carbon powder, nano-silicon, binder and NMP solvent, filter hard impurities and powder agglomerated particles of 0.5–5 μm, remove trace iron, copper, nickel metal impurities in raw materials, avoid pinholes, scratches, and short circuits in the polarizer and ensure the uniformity of polarizer coating

• Atmosphere filtration of high-temperature sintering furnace: during the 800–1100℃ inert atmosphere (nitrogen/argon) sintering process of silicon-carbon anode, online filtration of carbon black, silicon vapor condensate, and ultra-fine dust in the furnace, maintain high purity of furnace atmosphere, prevent surface pollution and structural defects of anode materials, and ensure stable electrochemical performance of materials.

• High-temperature exhaust gas purification of sintering furnace: precise filtration of high-temperature dust-containing exhaust gas at 300–600℃, intercept and recover ultra-fine silicon-carbon powder raw materials, reduce material loss, and achieve up-to-standard exhaust gas discharge, balancing production cost and environmental protection requirements.

• Filtration for nano-silicon precursor preparation: suitable for nano-silicon CVD vapor deposition and plasma reaction sections, filter ultra-fine silicon powder impurities of 0.1–1μm, improve the purity of nano-silicon raw materials, and ensure batch performance consistency of carbon-silicon anode.

• Production of ternary precursor materials for power batteries: In conjunction with reaction vessels, it increases reaction concentration and narrows particle distribution to obtain better morphology particles.

1.2 Core Application Advantages

• Ultra-high cleanliness, eliminate battery hidden dangers: 0.1μm precision filtration, no fiber shedding, can control trace metal impurities ≤10 ppb, effectively reduce battery self-discharge rate, improve battery cycle life and energy density.

• High temperature resistance adapts to high-temperature sintering working conditions: can withstand long-term 900℃ high temperature and inert reducing atmosphere, do not chemically react with silicon and carbon materials, do not pollute materials, adapt to high-temperature preparation process of carbon-silicon anode.

• High dirt-holding capacity and anti-clogging, suitable for high-viscosity slurry: for fiber medium, dirt-holding capacity is 3–5 times that of traditional surface filtration filter elements, can stably adapt to high solid content, high-viscosity anode slurry, extend filter element replacement cycle.

• Long-lasting durability, reduce production cost: can be regenerated by online back blowing, service life is 5–10 times that of traditional PP and PTFE filter elements, suitable for continuous production line, reduce downtime maintenance frequency, greatly reduce comprehensive operation and maintenance costs.

2. Application in Nuclear Industry Field

The nuclear industry working conditions are characterized by high temperature, pressure, strong corrosion, radioactivity, and high safety level, with strict requirements on the stability, reliability, service life and safety of filtration products. Nuclear-grade sintered metal filters comply with EJ/T 20073-2014 industry specifications, and are core safety filtration elements for nuclear reactors, spent fuel reprocessing, nuclear fuel preparation, and nuclear facility ventilation systems.

2.1 Specific Application Sections

• Filtration of primary and secondary circuit coolants of reactors: filter and remove corrosion products and solid impurities such as iron oxide and cobalt oxide in circuit coolants, avoid core fouling, reduced heat transfer efficiency, radioactive deposition and other problems, and ensure stable and safe operation of reactors.

• Spent fuel reprocessing filtration: in the spent fuel dissolving solution and extract treatment sections, intercept radioactive solid particles of 0.5–5 μm, prevent process pipeline and equipment blockage, avoid material cross-contamination; at the same time, precisely filter process waste gas containing radioactive aerosols and iodine vapor, block the diffusion of radioactive substances.

• Nuclear fuel preparation and uranium conversion: filter and recover ultra-fine UO₂ powder in kiln exhaust gas, reduce radioactive material loss; precisely purify protective gases such as argon and nitrogen for production, remove trace moisture, oxygen and solid impurities, ensure the atmosphere purity of nuclear fuel preparation meets standards.

• Ventilation air purification of nuclear facilities: applied to the ventilation systems of control rooms and operation areas of nuclear power plants, efficiently intercept radioactive dust and aerosols, purify the operating environment air, protect the personal safety of staff, and meet nuclear safety waste gas emission standards.

2.2 Core Application Advantages

• Nuclear-grade safety and reliability: made of nuclear-grade nickel-based alloy materials such as Inconel^® 600/625, with excellent radiation resistance and stress corrosion resistance, product service life can reach more than 10 years, adapt to the 60-year design life requirements of nuclear facilities, no risk of radioactive secondary pollution.

• Super tolerance to extreme working conditions: can withstand long-term 200–350℃ high temperature, 15–20 MPa high pressure, stably adapt to strong corrosive media such as boric acid coolant and radioactive dissolving solution, with extremely strong working condition adaptability.

• High-precision radioactive interception: achieve 0.1μm absolute filtration, radioactive particle interception efficiency ≥99.97%, effectively block the diffusion of radioactive substances, ensure equipment operation safety and environmental safety.

• Low secondary pollution, easy operation and maintenance: support remote online back blowing and offline cleaning regeneration, reduce direct personnel contact with radioactive media; high regeneration efficiency, greatly reduce the generation of radioactive hazardous waste, in line with the core principle of minimizing nuclear waste.

3. Application Parameters and Selection Comparison Table

Comparison Dimension	New Energy Lithium Battery Carbon-Silicon Anode Field	Nuclear Industry Field
Recommended Core Material	316L Stainless Steel, Titanium Alloy	Nuclear-grade Nickel-based Alloy, Titanium Alloy, Hastelloy® , Monel®
Applicable Filtration Accuracy	Slurry 0.5–5 μm; Gas 0.1–1 μm	Liquid 0.1–5 μm; Gas 0.1 μm Precision Filtration
Working Temperature Range	Room Temperature～1100℃	Room Temperature～350℃
Working Pressure Range	2–10 MPa	15–20 MPa
Core Performance Requirements	No Secondary Pollution, High Temperature Resistance, High Dirt-holding Capacity, Renewable	Radiation Resistance, Corrosion Resistance, High Safety, Long Service Life, Low Hazardous Waste
Conventional Service Life	3–5 Years	More Than 10 Years
Core Value	Improve Battery Energy Density and Cycle Life, Reduce Production Cost	Ensure Nuclear Facility Operation Safety, Avoid Radioactive Risks, Comply with Nuclear Safety Specifications

4. Summary

With excellent high temperature resistance, high pressure resistance, corrosion resistance, high precision filtration and renewable performance, sintered metal filters perfectly match the core needs of high-temperature clean production of lithium battery carbon-silicon anodes and extreme safety working conditions in the nuclear industry. Compared with traditional filtration products, their advantages of no secondary pollution, long service life, low operation and maintenance, and high safety can effectively improve product yield, ensure stable equipment operation, and avoid production safety risks. They are indispensable core precision filtration equipment in the fields of new energy high-end materials and nuclear industry.