Precision Vacuum Sintering

Background

The client is a reputed manufacturer of advanced sintered metal filters. These filters are made from stainless steel (SS316L, SS310) and nickel-based alloy powders — compacted into precise geometries and sintered at high temperatures to form porous yet mechanically robust structures for high-purity applications.

Technical Challenge

• Maintaining ±3°C temperature accuracy across stacked parts
• Preventing oxidation during high-temp sintering (1100–1350°C)
• Preserving pore integrity without collapse or over-sintering
• Accommodating different filter geometries and batch sizes
• Requiring vertical loading for gravity-assisted shape retention

Lakshmi Vacuum's Solution

Lakshmi designed and supplied a BLVSF Series Bottom-Loading Vacuum Sintering Furnace tailored to deliver precision, reproducibility, and structural integrity.

Technical Insight: Vacuum Sintering

• Debinding and degassing of powder compacts in vacuum
• Solid-state diffusion bonding below melting point
• Retention of pore size and permeability with improved strength
• Oxidation prevention using vacuum or inert gas atmosphere
• Bottom-loading ensures geometry stability and even heating

Customer Validation

Real production trials were conducted with extensive evaluation across all critical parameters.

• Uniform pore structure across all sintered parts
• >98% densification without pore blockage
• Consistent geometry and mechanical strength
• No discoloration or oxidation on any part
• Process window control maintained within ±2°C

Long-Term Impact

Why Lakshmi Vacuum?

• Deep experience in PM part and filter sintering
• Specialized in bottom-loading vacuum systems
• Turnkey support: design → training → maintenance
• In-house metallurgy and process development capabilities

Conclusion

The client scaled up their high-purity metal filter production with complete control, precision, and confidence — thanks to Lakshmi Vacuum's advanced sintering platform and engineering support. The BLVSF furnace is now a critical part of their world-class production line.