Liquid argon, as a key material in semiconductor manufacturing, is widely used in processes such as wafer cleaning, sputtering, and deposition. Its purity must reach over 99.9995%, and even a small amount of impurities can cause significant yield losses. Therefore, the storage tanks for liquid argon not only serve as simple storage containers but are also crucial equipment for ensuring process stability. They should meet the following core requirements:
1.Extreme purity guarantee
The inner liner is constructed of high-purity electrolytic polished 316L stainless steel, which has minimal leaching and excellent corrosion resistance.
Surface treatment: The inner surface has a roughness of ≤ 0.8 μm and is passivated to generate an inert chromium oxide coating.
Sealing: All interfaces use ultra-high vacuum or clean face seals, which prevent leakage and infiltration.
2.Effective insulation and vaporization control
Vacuum multilayer insulation (MLI): The tank’s inner layer is evacuated to a high vacuum, and several layers of insulation films are woven. The thermal evaporation rate is ≤ 0.2% per day.
Pressure management: A stabilization system and exhaust device are equipped to ensure stable gas supply. Additionally, tail gas recovery is supported to enhance environmental friendliness.
3.Integrated clean transportation
Pipeline connection: The outlet pipeline is welded to high-purity pipes with high-purity inner walls, ensuring no particle contaminants are carried out.
End-of-line filtration: A particle filter is installed to meet the ISO Class 1-5 cleanroom level requirements.
4.Safety monitoring and compliance
Safety devices: Multiple pressure release devices, rupture discs, and temperature control systems, in line with factory safety regulations.
Intelligent monitoring: Connected to building automation (BMS) or distributed control systems (DCS), real-time monitoring of liquid level, pressure, temperature, and purity.
Green design: Reducing heat evaporation loss, supporting safe emptying maintenance, and reducing environmental impact.
5.Reliability and Maintenance
Simple maintenance design: Key components may be dismantled and changed without compromising system cleanliness.
Redundant configuration: For critical process gas supply, a dual-tank system can be considered to achieve zero interruption in gas supply.
Manufacturer qualifications: Select brands with semiconductor industry experience to assure factory deliveries meet clean and sterile standards.
Conclusion
Ultra-pure liquid argon storage tanks are an indispensable basic link in the semiconductor manufacturing chain. By strictly controlling purity, heat loss, clean transportation and system reliability, it can effectively ensure process stability and product yield. Selecting high-performance storage tanks that meet specifications is a necessary investment for achieving high-quality and high-efficiency production.
