Laser remelting process for plasma-sprayed zirconia coating

Details Laser remelting process for plasma-sprayed zirconia coating Laser remelting process for plasma-sprayed zirconia coating

1995-05-09

1996-11-19

Bareford, Katherine

Coating processes

Spray coating utilizing flame or plasma heat

Metal oxide containing coating

427554, 427556, 427350, 427553, 4274193, C23C 410

Patent

active

055760694

ABSTRACT:
A laser remelting process is provided to fabricate a metal article with a thermal-barrier ceramic top coat having improved oxidation resistance and surface properties. The process includes the combination of following two laser remelting treatments which are conducted while the metal substrate is at temperatures above 850.degree. C.: (1) Firstly, remelt a plasma-sprayed zirconia coating which is applied on a metal article by means of a high-power laser. The process step is assigned as a "primary laser remelting" step; (2) coat the treated surface with a thin layer of zirconia powder, then remelt the surface of the article while the metal substrate is preheated. The step is assigned as a "secondary laser remelting" step. The treated articles are well-suited for such applications as turbine blades and engine parts operated at high temperatures and corrosive environment.

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patent: 4988538 (1991-01-01), Horvei et al.
Jasim, et al. "Pulsed Laser Sealing of Plasma-sprayed Layers of 8 wt % Yttria Stabilized Zirconia," Journal of Materials Science, 27:3903-3910 (1992) (no month date).
Jasim, et al. "Operating Regimes for Laser Surface Engineering of Ceramics," Journal of Materials Science, 27:1937-1946 (1992) (no month date).
Jasim, et al. "Laser Sealing of Plasma-Sprayed Calcia-Stabilized Zirconia," Journal of Materials Science Letters, 7:1307-1309 (1988) (no month date).

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