Articles having coatings of fine-grained and/or equiaxed grain s

Details Articles having coatings of fine-grained and/or equiaxed grain s Articles having coatings of fine-grained and/or equiaxed grain s

1989-06-09

1990-04-24

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

378144, 428665, H01J 3510

Patent

active

049200127

ABSTRACT:
Fine-grained and/or equiaxed tungsten and/or rhenium coatings, substantially free from columnar structure, are deposited on substrates (especially graphite) by chemical vapor deposition by directing the flow of reactant gases to the substrate with high velocity and in close proximity thereto, most often at a velocity gradient of at least about 1050 and preferably at least about 2000 cm./cm.-sec. The deposition process is preferably conducted while moving the substrate so as to coat large areas thereof. By this method, tungsten and/or rhenium-coated articles useful as X-ray targets having excellent properties under conditions of rapid temperature cycling may be produced.

REFERENCES:
patent: 3024522 (1962-03-01), Cacciotti
patent: 3579022 (1971-05-01), Hennig et al.
patent: 3637374 (1972-01-01), Holzi et al.
patent: 3703405 (1972-11-01), Brenner et al.
patent: 3719854 (1973-03-01), Sedlatschek et al.
patent: 3889634 (1975-03-01), Konieczynski et al.
patent: 3982148 (1976-09-01), Kaplan et al.
patent: 4005698 (1977-02-01), Cuomo et al.
patent: 4482837 (1984-11-01), Koizumi et al.

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