Polycrystalline supperlattice coated substrate and method/appara

Details Polycrystalline supperlattice coated substrate and method/appara Polycrystalline supperlattice coated substrate and method/appara

1996-07-05

1998-07-21

Turner, Archene

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428469, 428472, 428697, 428698, 428699, 428701, 428702, 428704, B32B 702

Patent

active

057832951

ABSTRACT:
The present invention provides a coated article comprising a substrate that can be non-crystalline or crystalline such as a polycrystalline engineering material, having advantageous mechanical properties and a superlattice-type protective composite coating on the substrate. The composite coating comprises a plurality of vapor deposited, ion bombarded, polycrystalline layers of different adjacent compositions formed one atop the other in lamellar manner. The polycrystalline layers have sufficiently thin individual layer thicknesses (e.g. not exceeding about 150 nanometers) and sufficiently distinct and different compositions proximate their interfaces despite being ion bombarded as to constitute superlattice layers that exhibit a collective hardness exceeding the hardness of any individual layer material in homogenous or bulk form. The composite coating is ion bombarded to an extent that the individual layers are substantially free of intragranular voids without adversely affecting the compositional modulation of the superlattice layers. Moreover, the composite coating can have planar or non-planar interlayer interfaces and still exhibit substantially improved hardness.

REFERENCES:
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patent: 4643951 (1987-02-01), Keem et al.
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patent: 4895770 (1990-01-01), Schintlmeister et al.
patent: 4984940 (1991-01-01), Bryant et al.
patent: 5075181 (1991-12-01), Quinto et al.
Holleck and Schulz, "Preparation and Behaviour of Wear-Resistant TiC/TiB.sub.2 and TiC/TiN Coatings with High Amounts of Phase Boundaries" Surface and Coating Technology, 36 (1988) pp. 707-714.
"Ion Irradiation Effects During Growth of Mo/V(001) Superlattices by Dual-Target Magnetron Sputtering"; J. of Crystal Growth 121 (1992) pp. 399-412; Hakansson et al.

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