Coating processes – Coating by vapor – gas – or smoke – Mixture of vapors or gases utilized
Reexamination Certificate
2011-03-29
2011-03-29
Turner, Archene (Department: 1784)
Coating processes
Coating by vapor, gas, or smoke
Mixture of vapors or gases utilized
C427S255150, C427S255180, C427S255280, C427S255390, C427S419200
Reexamination Certificate
active
07914849
ABSTRACT:
A new and refined method to produce α-Al2O3layers in a temperature range of from about 750 to about 1000° C. with a controlled growth texture and substantially enhanced wear resistance and toughness than the prior art is disclosed. The α-Al2O3layer of the present invention is formed 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 oxidising pulses. The α-Al2O3layer according to the present 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 4 to about 8. The layer is characterized by a strong (104) growth texture, measured using XRD, and by low intensity of (012), (110), (113), (024) and (116) diffraction peaks.
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Provision of a copy of the minutes in accordance with Rule 124(4) EPC dated Jul. 19, 2010 issued in EP 05 445 083.8.
Communication pursuant to Rule 82(2) EPC dated Nov. 9, 2010 issued in EP 05 445 083.8.
Drinker Biddle & Reath LLP
Seco Tools AB
Turner Archene
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