Sintered metal filters (sintered metal powder / fiber filter elements) are core solutions in the silicon industry (polycrystalline silicon, semiconductor silicon wafers) for precision filtration of high-temperature, highly corrosive, high-purity, and micro-silica powder-containing fluids. They are the mainstream alternative to bag-type / polymer filter elements.

1. Product Features

• High precision: Filtration accuracy 0.1–100 μm, accurately intercepting micro-silica powder, metal chlorides, etc., meeting electronic-grade high-purity requirements.

• High temperature resistance: Stainless steel / alloy materials, long-term resistance to 450–600 °C, instantaneous up to 900 °C, suitable for reduction and cold hydrogenation high-temperature conditions.

• Strong corrosion resistance: Optional 316L, Monel, Hastelloy, pure nickel / titanium, resistant to highly corrosive media such as chlorosilanes, HCl, HF, Cl₂.

• High strength and rigidity: Integrally sintered, resistant to pressure fluctuations and shocks, no fiber shedding, no secondary pollution.

• Easy regeneration, long service life: Can be cleaned by gas backblowing, liquid backflushing, chemical cleaning; service life 3–10 years, much longer than polymer / fiberglass filter elements.

• Uniform pore size, stable flux: Three-dimensional network structure, high porosity, stable pressure difference, suitable for continuous large-scale production.

2. Typical Applications in Silicon Industry

2.1 Polycrystalline Silicon Production

• Cold hydrogenation section: Filtration of high-temperature cold hydrogenation product gas, silicon tetrachloride (STC), trichlorosilane (TCS) liquids, removing silica powder and metal impurities, protecting catalysts and heat exchangers.

• Reduction section: Filtration of high-temperature silane gas and hydrogen (H₂), intercepting micro-silica powder to avoid deposition on silicon rod surfaces affecting purity and growth.

• Disproportionation / dry recovery: Filtration of chlorosilane mixed gas, removing solid particles, improving recovery purity and reducing energy consumption.

• Exhaust gas treatment: Precision filtration of high-temperature dust-containing exhaust gas, anti-corrosion, anti-clogging, meeting emission standards.

2.2 Semiconductor Silicon Wafer Manufacturing

• Wafer cleaning water: Terminal filtration of ultrapure water, removing particles and metal ions to avoid yield loss.

• Chemical delivery (HF, ammonia water, photoresist): Precision filtration to prevent impurities from scratching wafer surfaces.

3. Core Advantages

• Adapt to extreme conditions: High temperature resistance + strong corrosion resistance, solving pain points of bag-type / paper filter elements such as high-temperature burning, corrosion damage, and short service life.

• Guarantee high-purity quality: No fiber shedding, no secondary pollution, meeting ppb-level impurity control requirements for semiconductors / photovoltaics.

• Cost reduction and efficiency improvement: Long service life + renewable, reducing downtime and spare parts consumption; high flux, low pressure difference, lowering energy consumption and maintenance costs.

• Safe and reliable: Explosion-proof, impact-resistant, rigid structure, suitable for flammable, explosive, and highly corrosive high-risk environments in silicon industry.

• Continuous production: Online backblowing and automatic operation available, adapting to 24-hour continuous large-scale production and stabilizing product quality.

Conclusion

Sintered metal filters are the optimal solution for high-temperature, high-purity, and highly corrosive fluid filtration in the silicon industry, covering key sections such as polycrystalline silicon cold hydrogenation / reduction / exhaust gas, semiconductor cleaning / chemicals, with comprehensive advantages in accuracy, temperature resistance, corrosion resistance, service life, and cost.