CVD Al2O3 coated cutting tool

• Main Author: BJORN, LJUNGBERG
• Format: Patent
• Language: English; French; German
• Published: 21.04.2010
• Subjects: BORING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TURNING

According to the present invention there is provided a body at least partially coated with one or more refractory layers of which at least one layer essentially consist of a fine grained kappa -Al2O3. Said kappa -Al2O3 layer consists of essentially equiaxed grains with an average grain size of <0.5 mu m. The Al2O3 layer further comprises at least one sublayer containing Al, Si and O. This particular fine grained kappa -Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.