Aerospace structural hardware demands high strength-to-weight ratios, corrosion resistance, and total structural reliability. Grade 5 Titanium (Ti6Al4V) remains the gold standard for structural brackets, engine mounts, and critical flight hardware. While Direct Metal Laser Sintering (DMLS) has long dominated metal 3D printing, Cold Metal Fusion (CMF) offers an alternative for producing precision titanium parts with reduced thermal stress and lower cost-per-part.
Understanding the Process Mechanisms
DMLS relies on high-powered lasers to fully melt titanium powder layer by layer in a localized burn pool. While effective, this extreme thermal input creates severe internal thermal stress gradients, requiring extensive support structures anchored to a build plate, followed by labor-intensive stress-relief heat treatment and manual support removal.
Cold Metal Fusion decouples the printing and sintering steps. CMF utilizes a low-temperature Selective Laser Sintering (SLS) process to shape polymer-coated Ti64 powder into a dense “green part”. The green part then undergoes automated debinding and high-vacuum thermal sintering, bonding the titanium particles to achieve near-forged densities (~98.5–99.5%) without localized melting stresses.
Evaluating Throughput, Stress Control, and Cost-per-Part
Thermal Stress Control: Because CMF shapes parts at lower processing temperatures, components do not suffer from the warp vectors common in DMLS. Support structure requirements are minimized, preserving part geometry.
Build Throughput: CMF platforms achieve up to three times faster printing throughput compared to standard mid-format DMLS machines, enabling higher output for low-to-mid volume production runs.
Mechanical Integrity: Post-sintered CMF Grade 5 Titanium achieves tensile strengths exceeding 1000 MPa and elongation of 10–15%, meeting strict mechanical requirements for aerospace structural applications. Optional Hot Isostatic Pressing (HIP) can further optimize internal density.
Making the Selection for Flight Hardware
For intricate aerospace brackets requiring internal channels or dense batch production, CMF reduces processing costs and secondary machining cycles.
Navigating metal additive manufacturing requires matching part geometry with the optimal process. To evaluate your aerospace components for Cold Metal Fusion, reach out to the engineering team.
