C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/74.5
C23C 9/02 (1980.01)
Patent
CA 1086578
Abstract of the Disclosure In the pack diffusion coating of chromium into the surface of a superalloy, the formation of undesirable oxide inclusion is reduced when the diffusion coating pack contains at least about 3% Ni3Al. Also the formation of alpha-chromium is reduced when the pack diffusion is carried out in a retort effectively not over five inches in height. Pack aluminizing in the presence of chromium makes a very effective aluminum- and chromium-containing top coating over platinum plated or platinum coated nickel-base superalloys. Aluminized nickel can also have its aluminum attacked and at least partially removed with aqueous caustic to leave a very highly active catalytic-surface. Pack diffusion can also be arranged to simultaneously provide different coatings in different loca- tions by using different pack compositions in those locations. An aluminizing pack containing a large amount of chromium provides a thinner aluminized case than an aluminizing pack containing less chromium, or less chromium and some silicon. A cobalt-chromium pack deposits essentially a chromized case when energized with a chloride, but deposits large amounts of cobalt along with chromium when energized with an iodide. Even more chromium with large amounts of cobalt are deposited when the energizer is a mixture of iodide and chloride. Depletion of diffusible material from workpieces heated in powder-pack can also be readily controlled by adjusting the pack composition, and such depletion from cobalt-base super- alloys very simply provides a surface on which aluminizing produces a highly impact-resistant coating.
317283
Baldi Alfonso L.
Damiano Victor V.
Alloy Surfaces Company Inc.
Macrae & Co.
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