Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1989-11-27
1994-01-25
Lechert, Jr., Stephen J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428565, 428667, 428668, 428680, 428681, 428689, 4284722, B22F 300
Patent
active
052814874
ABSTRACT:
An improved thermal barrier coating is disclosed. The coating is formed on a metal part to be exposed to high temperature gases. The metal part is first coated with an adherent sublayer of MCrAlY alloy. In this case, the M of the MCrAlY is nickel, cobalt, iron, or some combination of these metals. A diffused layer of MCrAlY combined with a low concentration of mullite is formed over the MCrAlY subcoating and the mullite is increased in concentration as the thickness of the layer increases. The outer surface of the layer is all mullite. Improved life expectancy and decreased thermal conductivity is achieved.
REFERENCES:
patent: 4399199 (1983-08-01), McGill et al.
patent: 4485150 (1984-11-01), Tsuno
patent: 4871621 (1989-10-01), Bagley et al.
Gray Dennis M.
Mehan Richard L.
Rairden, III John R.
Rumaner Lee E.
General Electric Company
Lechert Jr. Stephen J.
Magee Jr. James
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