Enhanced alumina layer with texture

Details Enhanced alumina layer with texture Enhanced alumina layer with texture

2011-06-07

2011-06-07

Chen, Bret (Department: 1715)

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

C427S255390, C427S249100, C427S255394, C427S255700

Reexamination Certificate

active

07955651

ABSTRACT:
A refined method to produce textured α-Al2O3layers in a temperature range of 750-1000° C. with a controlled texture and substantially enhanced wear resistance and toughness than the prior art is disclosed. The α-Al2O3layer is formed on a bonding layer of (Ti,Al)(C,O,N) with increasing aluminum content towards the outer surface. Nucleation of α-Al2O3is obtained through a nucleation step composed of short pulses and purges of Ti-containing and oxidizing steps. The α-Al2O3layer has a thickness ranging from 1 to 20 μm and is composed of columnar grains. The length/width ratio of the alumina grains is from 2 to 15, preferably 6 to 10. The layer is characterized by a strong (110) growth texture, measured using XRD, and by the low intensity of (012), (104), (113), (024) and (116) diffraction peaks.

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