Method for diffusion coating a workpiece with Cr, Si, Al or B by

Details Method for diffusion coating a workpiece with Cr, Si, Al or B by Method for diffusion coating a workpiece with Cr, Si, Al or B by

1991-04-25

1992-08-04

Beck, Shrive

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427237, 427252, 427253, 427314, 4273835, B05D 714, B05D 722

Patent

active

051357771

ABSTRACT:
A method for diffusion coating a workpiece with chromium (Cr), silicon (Si), aluminum (Al), or boron (B) by placing coated ceramic alumino-silicate fibers next to the workpiece and heating to diffuse the diffusion coating into the workpiece. A ceramic carrier is fabricated from the alumino-silicate fibers woven into a predetermined fashion. Alternately the ceramic carrier may be an elongated ceramic carrier. The aqueous diffusion coating composition is applied to the ceramic carrier and then the ceramic carrier is heated at a temperature of between about 150.degree. F. to 250.degree. F. prior to positioning the ceramic carrier proximate a surface of the workpiece. The ceramic carrier and the workpiece are subjected to an elevated temperature in a controlled environment for a sufficient time to cause at least one diffusion element to diffuse into the workpiece to provide the diffusion coating for the external, the internal, or both surfaces of the workpiece.

REFERENCES:
patent: 4041196 (1977-08-01), Baldi et al.
patent: 4208453 (1980-01-01), Baldi
patent: 4290391 (1981-09-01), Baldi
patent: 4471008 (1984-09-01), Huther
patent: 4812179 (1989-03-01), Sayles
patent: 4904501 (1990-02-01), Davis
patent: 5041309 (1991-08-01), Davis et al.

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