METHOD FOR DEPOSITING CRYSTALLIZED α-Al2O3 LAYER ON CUTTING TOOL INSERT AT TEMPERATURE OF 625 TO 800 DEGREES CENTIGRADE BY CHEMICAL VAPOR DEPOSITION AND CUTTING TOOL INSERT WITH COATING COMPRISING ONE OR MORE α-Al2O3 LAYERS

• Main Author: LJUNGBERG, BJORN
• Format: Patent
• Language: English; Korean
• Published: 27.01.2005
• Edition: 7
• 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; COMBINED OPERATIONS; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; MILLING; OTHER WORKING OF METAL; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TURNING; UNIVERSAL MACHINE TOOLS

PURPOSE: To provide a CVD process for depositing an α-Al2O3 layer at a temperature of 800 deg.C or less, a method for forming an abrasion resistant coating comprising one or more layers substantially consisting of α-Al2O3 deposited by CVD at a temperature of 800 deg.C or less on a rigid tool body, and an alumina coated cutting tool insert, carbide end-mill or solid carbide drill having improved cutting performance against steel. CONSTITUTION: In a cutting tool comprising a body formed of sintered hard metal, cermet, ceramic, high speed steel or superhard materials such as cubic crystalline boron nitride, diamond and the like, and an abrasion resistant rigid coating formed on at least a working portion of the surface of the body, the abrasion resistant rigid coating comprising one or more layers substantially consisting of crystallized α-Al2O3 having thickness of 0.5 to 10 μm, the cutting tool is characterized in that the crystallized α-Al2O3 has columnar grains that have an average particle width of 0.1 to 1.1 μm and are deposited by CVD in a temperature range of 625 to 800 deg.C.