Coating processes – Applying superposed diverse coating or coating a coated base – Metallic compound-containing coating
Reexamination Certificate
2006-08-22
2006-08-22
Turner, Archene (Department: 1775)
Coating processes
Applying superposed diverse coating or coating a coated base
Metallic compound-containing coating
C427S255360, C427S419100, C427S419200
Reexamination Certificate
active
07094447
ABSTRACT:
The present invention introduces a new and refined method to produce α-Al2O3layers with substantially better wear resistance and toughness than the prior art. 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 both aluminizing and oxidization steps. The α-Al2O3layer according to this invention 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 12, preferably 5 to 9. The layer is characterized by a strong (012) growth texture, measured using XRD, and by the almost total absence (104), (110), (113) and (116) diffraction peaks.
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Drinker Biddle & Reath LLP
Seco Tools AB
Turner Archene
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