Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1990-07-13
1992-08-11
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428212, 428336, 428408, 428469, 428472, 428698, 428699, 428701, 428702, 428704, B32B 900, B32B 1900
Patent
active
051377748
ABSTRACT:
Improved properties of aluminum oxide wear layers on cemented carbides and related substrates can be obtained by combining the two alumina polymorphs (.alpha.-Al.sub.2 O.sub.3 and kappa-Al.sub.2 O.sub.3) as multilayers. The nucleation of .alpha.-Al.sub.2 O.sub.3 and particularly kappa-Al.sub.2 O.sub.3 can be controlled by means of modification layers. According to this invention, it is thus possible to CVD-deposit an oxide multicoating layer consisting of clearly specified layers of .alpha.-Al.sub.2 O.sub.3 and kappa-Al.sub.2 O.sub.3. Preferably, .alpha.-Al.sub.2 O.sub.3 is deposited first by CVD on a TiC coated cemented carbide substrate followed by the said coating layer of kappa-Al.sub.2 O.sub.3.
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Vuormen et al. "Characterization of .alpha.-Al.sub.2 O.sub.3, K-Al.sub.2 O.sub.3 and .alpha.-K Multioxide Coatings on Cemented Carbides" Thin Solid films, 193/194 (1990) pp. 536-546.
Chatfield "Characterization of the Interfaces in Chemical Vapors Deposited Coatings on Cemented Carbides" RM & HM Sep. 1990, pp. 132-138.
Robinson Ellis P.
Seco Tools AB
Turner Archene
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