发明名称 |
Diffusion coating combinations |
摘要 |
Diffusion coating a substrate metal with a different metal, such as aluminum and zinc, that is then chemically removed from the coated substrate, provides the residual metal with a very desirable catalytic surface. At least about a third of the removable metal can be dissolved out. Platinum wire screens activated in this way make effective exhaust catalysts for automotive engines. Chromium-rich coating for protective purposes can be applied on a superalloy, diffusion coating in a pack that in addition to the chromium to be diffused, also 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. Depletion of diffusible material from workpieces heated in a powder-pack can also provide a surface on which aluminizing produces a highly impact-resistant coating.
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申请公布号 |
US4292208(A) |
申请公布日期 |
1981.09.29 |
申请号 |
US19790000687 |
申请日期 |
1979.01.03 |
申请人 |
ALLOY SURFACES COMPANY, INC. |
发明人 |
BALDI, ALFONSO L.;DAMIANO, VICTOR V. |
分类号 |
B01J25/00;B01J35/04;B01J37/06;C23C10/40;C23C10/42;C23C10/50;C23C10/56;C23C10/58;C23C10/60;(IPC1-7):B01J23/16;B01J23/74;B32B15/14 |
主分类号 |
B01J25/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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