Oxide coated cutting tool

Details Oxide coated cutting tool Oxide coated cutting tool

2005-06-07

2005-06-07

Meeks, Timothy (Department: 1762)

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

C427S255340, C427S255700, C427S255360

Reexamination Certificate

active

06902764

ABSTRACT:
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 α-Al2O3. Said α-Al2O3layer consists of essentially equiaxed grains with an average grain size of <1 μm and with a bimodal grain size distribution with coarser grains with an average grainsize in the interval 0.5-1 μm and finer grains with an average grainsize of <0.5 μm. The Al2O3layer further contains striated zones containing titanium (>5 at %) but no nitrogen or carbon. This particular microstructure is obtained by temporarily stopping the gases needed for the growth of the Al2O3layer and introducing TiCl4.

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S. Ruppi et al., “Microstructure and deposition characteristics of κ-Al2O3”, J. Phys. IV France,9 (1999), pp. 349-355.
U.S. Appl. No. 10/155,168, Björn Ljungberg, “Oxide Coated Cutting Tool”, filed May 28, 2002.

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