Overview
Annealed titanium foil is produced by heating titanium sheets to specific temperatures (typically 650-800°C) followed by controlled cooling to relieve internal stresses and improve formability. This process enhances the material's workability while maintaining titanium's inherent advantages. The annealing process transforms the crystalline structure of titanium, making it softer and more ductile compared to cold-rolled titanium foil. This makes it particularly suitable for applications requiring complex forming or deep drawing operations where material flexibility is crucial.
Physical and Chemical Properties
Annealed titanium foil retains the excellent corrosion resistance characteristic of titanium, particularly against chlorides and oxidizing acids. Its passive oxide layer provides outstanding resistance to seawater and many industrial chemicals. The material exhibits a tensile strength range of 240-550 MPa depending on grade, with elongation at break typically between 15-25%. Electrical resistivity is relatively high (about 420 nΩ·m), and thermal conductivity is low (21.9 W/m·K), making it useful for certain electrical and thermal applications.
Main Applications
In aerospace, annealed titanium foil is used for honeycomb structures, thermal protection systems, and vibration dampers due to its high strength-to-weight ratio. The medical field utilizes it for surgical implants and dental applications where biocompatibility is essential. The chemical processing industry employs titanium foil in heat exchangers, reactor linings, and corrosion-resistant gaskets. Recent applications include flexible electronics, where its formability and conductivity make it suitable for flexible circuits and battery components.
Safety and Storage
While titanium is generally non-toxic and biocompatible, titanium dust generated during processing can pose inhalation hazards and is potentially flammable. Proper ventilation and dust collection systems should be used during machining operations. For storage, keep the foil in its original packaging until use to prevent surface contamination. Store in a dry environment away from strong oxidizing agents. Avoid stacking heavy materials on top of thin foil to prevent deformation.
B2B Procurement Guide
When procuring annealed titanium foil, specify the ASTM grade (commonly Grade 1, 2, or 5), thickness tolerance (±5-10% is typical), and surface finish requirements. Medical applications may require additional certification for biocompatibility. Lead times can vary from 4-12 weeks depending on specifications and quantity. For large-volume purchases, consider negotiating price breaks at quantity thresholds. Verify supplier certifications for aerospace or medical applications, as these often require additional documentation and traceability.
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