Coating and compositions

Details Coating and compositions Coating and compositions

1989-11-21

1990-12-11

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428653, 428220, 419 9, 419 23, 419 45, B22F 704

Patent

active

049770365

ABSTRACT:
Workpieces are very rapidly diffusion coated by heating the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling. Workpiece can have top coating layer of aluminum flake covered by a layer of extremely fine alumina or silica in a magnesium chromate binder, to provide surface having roughness at least about 10 micro-inches smoother than before the top coating. Used aluminized jet engine hot section members can be reconditioned by a fluoridizing treatment that deoxidizes and also removes residual aluminizing, so that the members can then be repaired if necessary and re-aluminized.

REFERENCES:
patent: 4624705 (1986-11-01), Jatkar et al.
patent: 4659546 (1987-09-01), Kearns
patent: 4849163 (1989-07-01), Bellis et al.
patent: 4917858 (1990-04-01), Eylon et al.

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