Why is copper used for the ceramic insert shank
These aren't aesthetic — they serve critical functions: Gold Coating (TiN, TiAlN): Enhances wear resistance and provides high heat tolerance. However, silicon nitride ceramic blades can be used to process gray cast iron at a speed of 440m/min (1450ft/min) or higher. Normal negative carbide tool holders have a top and side rake of -5°, whereas when machining with ceramics it is recommended (on materials under 45 HRc). Typically made from materials like carbide, ceramic, cermet, or polycrystalline diamond (PCD), these inserts are engineered to cut metal efficiently and consistently.
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