Overview
Sputtering target scrap consists of used or residual materials from physical vapor deposition (PVD) targets, primarily employed in semiconductor, display, and optical coating manufacturing. These scraps retain high metallic purity (typically 99.9-99.999%) and are valued for recycling. Composition varies by application: common materials include aluminum, copper, silver, gold, and specialized alloys like ITO (indium tin oxide) for display manufacturing. The scrap form ranges from intact target remnants to grinding dust, with value directly tied to metal content and contamination levels.
Physical and Chemical Properties
The properties mirror those of virgin target materials but may exhibit surface oxidation or process-induced structural changes. For instance, silver target scrap maintains conductivity (~6.3×10⁷ S/m) but may develop sulfide tarnish. Alloy scraps like Ti-Al-V retain their original phase composition but often feature eroded surfaces. Chemical stability depends on the base metal: noble metal scraps (Au, Pt) resist corrosion, while reactive metals (Al, Ti) require inert storage. Particle size distribution affects recyclability, with larger fragments preferred for direct remelting and fine powders needing consolidation.
Main Applications
Primary use is metal recovery through refining – precious metal scraps (Au, Ag) are reprocessed into new targets or other industrial products. Semiconductor-grade scraps may be reconditioned for less critical coatings after purification. Secondary applications include additive manufacturing (metal powders from ground scraps) and research purposes. ITO scrap is particularly valuable for indium recovery in display panel recycling. Some manufacturers reuse geometrically suitable scraps for small-scale deposition processes after surface refurbishment.
Safety and Storage
Storage requires material-specific protocols: reactive metals need argon/nitrogen blankets, while noble metals can be stored in dry air. Sharp edges mandate cut-resistant handling gear, and fine powders require explosion-proof containers. Safety data sheets (SDS) must reference both base metal hazards and process contaminants (e.g., fluorine from used CFx targets). Transport regulations vary by metal type – precious metal scraps often require chain-of-custody documentation to prevent theft during logistics.
B2B Procurement Guide
Key procurement factors include material certification (XRF analysis reports), moisture content (for oxidizable metals), and traceability to original target specifications. Suppliers should provide scrap morphology details (bulk vs. powder) and any pre-processing (e.g., degassing for high-vacuum applications). Pricing typically follows LME (London Metal Exchange) rates with discounts for lower purity or mixed lots. Just-in-time purchasing is advisable for reactive metals to minimize storage degradation. Reputable recyclers offer assay-based pricing and often handle international logistics for regulated materials.
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