Preparation and Application of Large Size CVD Diamond Thick Films

Diamond thick films with 120mm in diameter. up to 1mm thickness were prepared by the electron-assistant chemical vapor deposition (EACVD) method. SEM, Raman spectroscopy characterization and hardness test show that the films are pure polycrystalline diamond materials with hardness approaching to that of natural diamond (ND) and much higher than that of polycrystalline diamond (PCD). Field tests demonstrate that the drawing effect of CVD diamond wire dies is nearly equal to those obtained from ND and high quality PCD wire dies. This kind of CVD diamond wire die can be widely used in drawing W, Mo, Cu and stainless steel filaments.