Alumina layer with enhanced texture

Details Alumina layer with enhanced texture Alumina layer with enhanced texture

2005-11-02

2008-11-25

Turner, Archene (Department: 1794)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C051S307000, C051S309000, C407S119000, C428S336000, C428S697000, C428S698000, C428S699000, C428S701000, C428S702000

Reexamination Certificate

active

07455900

ABSTRACT:
A refined method to produce textured α-Al2O3layers in a temperature range of from about 750 to about 1000° C. with a controlled texture and substantially enhanced wear resistance and toughness than the prior art is disclosed. The α-Al2O3layer is deposited on a bonding layer of (Ti,Al) (C,O,N) with increasing aluminium content towards the outer surface. Nucleation of α-Al2O3is obtained through a nucleation step being composed of short pulses and purges consisting of Ti/Al-containing pulses and oxidizing pulses. The α-Al2O3layer according to this invention has a thickness ranging from about 1 to about 20 μm and is composed of columnar grains. The length/width ratio of the alumina grains is from about 2 to about 12, preferably from about 5 to about 8. The layer is characterized by a strong (116) growth texture, measured using XRD, and by low intensity of (012), (110), (113) (024) and diffraction peaks.

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