Laser remelting process for plasma-sprayed zirconia coating
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United States of America Patent
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Nov 19, 1996
Grant Date -
N/A
app pub date -
May 9, 1995
filing date -
May 9, 1995
priority date (Note) -
Expired
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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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