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公开(公告)号：US3867184A
公开(公告)日：1975-02-18
申请号：US32837873
申请日：1973-01-31
发明人： BALDI ALFONSO L , DAMIANO VICTOR V
IPC分类号： B01D53/86 , B01J23/40 , B01J23/755 , B01J35/04 , B01J37/06 , C23C10/02 , C23C10/48 , C23C10/56 , C23C10/60 , C23C9/00
CPC分类号： B01J35/04 , B01D53/86 , B01J23/40 , B01J23/755 , B01J37/06 , C23C10/02 , C23C10/48 , C23C10/56 , C23C10/60
摘要： In the diffusion coating of aluminum onto brazed metal, the penetration of the aluminum into the brazing is reduced by conducting the diffusion coating with hydrated aluminum chloride, bromide or iodide as energizer, with the energizer preferably kept out of contact with the work being coated until the energizer volatilizes. This is particularly suited for aluminizing chromium-containing surfaces. Chromium diffusion coatings are less apt to form undesirable oxide inclusions when the diffusion coating is from a pack containing at least about 3% Ni3Al. Also the formation of undesirable alpha-chromium is reduced when the pack diffusion is carried out with a retort effectively not over 5 inches in height. Pack aluminizing where the aluminizing is inhibited by the presence of chromium in the pack makes a very effective top coating over platinum plated or platinum coated nickel-base superalloys. Aluminized nickel can also have it 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 locations 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 and some silicon. Also 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.
摘要翻译： 在铝在钎焊金属上的扩散涂层中，通过用水化氯化铝，溴化物或碘化物作为增能剂进行扩散涂层，铝的渗透减少，激发剂优选与被涂覆的工件脱离接触直到 激化剂挥发。 这特别适用于含铬表面的镀铝。 当扩散涂层来自含有至少约3％Ni3Al的组件时，铬扩散涂层不易形成不期望的氧化物夹杂物。 此外，当使用有效地不超过5英寸高度的蒸馏器进行包装扩散时，还会形成不希望的α-铬。 通过镀层中的铬的存在来抑制镀铝处理的镀层镀层在镀铂或镀铂的镍基超级合金上形成非常有效的顶涂层。 镀铝的镍还可以使铝受到侵蚀，并用苛性碱水溶液至少部分去除以留下非常高活性的催化剂表面。 包装扩散还可以被布置成通过在那些位置使用不同的包装组合来在不同位置同时提供不同的涂层。 含有大量铬的镀铝包装提供比含有较少铬和一些硅的镀铝包装更薄的镀铝箱。 当用氯化物通电时，钴铬组合物基本上沉积在铬化的壳体中，但是当用碘化物通电时，它还会与铬一起沉积大量的钴。
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公开(公告)号：US3353936A
公开(公告)日：1967-11-21
申请号：US30726363
申请日：1963-09-06
发明人： SAMUEL GEORGE A , BELL JEROME V
IPC分类号： C23C10/12
CPC分类号： C23C10/12 , Y10S252/951 , Y10S428/938 , Y10T428/12333 , Y10T428/12639 , Y10T428/12854
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4.发明授权
公开(公告)号：US3764371A
公开(公告)日：1973-10-09
申请号：US3764371D
申请日：1970-11-18
发明人： BALDI A
CPC分类号： C23C10/60 , C23C10/38 , Y10T428/12861 , Y10T428/12944
摘要： RICH CHROMIUM DIFFUSION COATING ON TD NICKEL OR TD NICHROME IS OBTAINED IN ONE STEP BY EMBEDDING WORK IN CHROMIUM DIFFUSION COATING PACK CONTAINING NICKEL WITH OR WITHOUT SOME COBALT, AND HELD IN UNSEALED RETORT CUP AT LEAST 15 INCHES HIGH. MAGNESIUM HALIDE IS HELPFUL TO HAVE IN THE PACK AND PACK CAN ALSO CONTAIN METALLIC IRON TO REDUCE COATING TEMPERATURE. MASKING IS ARRANGED BY COVERING THE SITES TO BE MASKED WITH A LAYER OF A MIXTURE OF NICKEL POWDER AND INERT FILLER. FOR BETTER HIGH TEMPERATURE OXIDATION RESISTANCE THE CHROMIUM-RUCH COATING IS COVERED BY AN ALUMINUM DIFFUSION COATING FROM A SIMPLE ALUMINUM DIFFUSION PACK OR ONE THAT HAS THE ALUMINUM MIXED WITH CHROMIUM. LOW TEMPERATURE ALUMINUM DIFFUSION IS MORE UNIFORM WHEN PACK ENERGIZER IS ALUMINUM CHLORIDE OR OTHER MATERIAL THAT DOES NOT GENERATE NITROGEN. A MANGANESE-CONTAINING ALUMINIZING PACK GIVES BETTER PROTECTION THAN A SIMPLE ALUMINIZING PACK, PARTICULARLY AGAINST MARINE CORROSION, AND WHEN THERE IS A CONVERSION COATING APPLIED OVER THE ALUMINIZING. CONVERSION COATING MIXTURE WETS ALUMINIZED FERROUS SURFACE BETTER WHEN THE BLACK IS THEN REMOVED WITH THE HELP OF NITRIC ACID. ALUMINIZED SUPERALLOY CAN BE HEATED IN AIR TO WHITEN IT, THEN CLEANED TO GIVE PRODUCT HAVING MORE ADHERENT CASE. ALSO ADDING SOME LANTHANUM OR YTTRIUM TO SUPERALLOY LIKE WI 52 GIVES BETTER HIGH TEMPERATURE RESISTANCE.
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5.发明授权
公开(公告)号：US3375128A
公开(公告)日：1968-03-26
申请号：US48471165
申请日：1965-09-02
发明人： BALDI ALFONSO L , NICE WILLIAM E
IPC分类号： C23C10/42
CPC分类号： C23C10/42
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公开(公告)号：US3059911A
公开(公告)日：1962-10-23
申请号：US553660
申请日：1960-01-29
发明人： SAMUEL GEORGE A , BELL JEROME V
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公开(公告)号：US3785854A
公开(公告)日：1974-01-15
申请号：US3785854D
申请日：1972-05-18
发明人： BALDI A
CPC分类号： C23C22/74 , C23C10/60 , Y02T50/67 , Y10S428/938 , Y10T428/12743 , Y10T428/12854
摘要： Rich chromium diffusion coating on dispersion-strengthened nickel or nichrome is obtained in one step by embedding work in chromium diffusion coating pack containing nickel with or without some cobalt, and held in unsealed retort cup at least 15 inches high. Pack can also contain metallic iron to reduce coating temperature. Masking is arranged by covering the sites to be masked with a layer of a mixture of nickel powder and inert filler. For better high temperature oxidation resistance the chromium-rich coating is covered by an aluminum diffusion coating from a simple aluminum diffusion pack or one that has the aluminum mixed with chromium. Low temperature aluminum diffusion is more uniform when pack energizer is aluminum chloride or other material that does not generate nitrogen, and gives good protection against marine corrosion of steels, and particularly when there is a chromate-type coating applied over the aluminizing. Highly effective chromate-type coating mixture consists essentially of aqueous solution of chromic and phosphoric acid also containing magnesium salts of said acids and dispersed polytetrafluoroethylene particles. Aluminized superalloy can be heated in air to whiten it, then cleaned to give product having more ductile case. Such coated superalloy can also be stripped of coating by aqueous HNO3-HF-CrO3 bath.
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8.发明授权
公开(公告)号：US3622391A
公开(公告)日：1971-11-23
申请号：US3622391D
申请日：1969-04-04
发明人： BALDI ALFONSO L
CPC分类号： C23F1/44
摘要： An improved stripping process for removing as produced aluminide coatings and exposed aluminide coatings from cobalt base and nickel base superalloys, using 1/2 to 5 percent of hydrofluoric acid or an acid fluoride having at least one mole of hydrofluoric acid, 3 to 20 percent of nitric acid and water, permissibly including a low foaming or nonfoaming wetting agent. The temperature of treatment is 50* to 115* F., preferably 60* to 100* F. for a time of at least 15 minutes. The treating solution can incorporate a thickening agent and a solubilizing agent for the thickening agent so as to produce a paste, and the paste can be applied locally for selective stripping.
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公开(公告)号：US3066044A
公开(公告)日：1962-11-27
申请号：US79433559
申请日：1959-02-19
发明人： SAMUEL GEORGE A
IPC分类号： C23C10/32
CPC分类号： C23C10/32
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公开(公告)号：US3903338A
公开(公告)日：1975-09-02
申请号：US42632673
申请日：1973-12-19
发明人： COOK GEORGE , BALDI ALFONSO L
CPC分类号： C23C10/60
摘要： Workpieces are diffusion coated by packing them singly in individual snugly fitting retorts with a diffusion coating pack, heating the packed retorts to diffusion coating temperature for a time adequate to effect the desired coating, and then rapidly cooling the retorts. The small amount of pack surrounding the workpiece permits very rapid cooling without the need to apply a cooling liquid to these small retorts, and entire coating operation is accordingly well suited for coating nickel-base superalloys that should before use be subjected to solution heat treatment and rapid cooling with or without subsequent aging. The diffusion coating can then be conducted under solution heat treating conditions. Tubular retorts can be used.
摘要翻译： 工件通过将它们单独包装在具有扩散涂层包装的各个紧密配合的蒸馏器中而被扩散涂覆，将包装的蒸馏器加热至扩散涂布温度足以实现所需涂层的时间，然后快速冷却蒸馏器。 围绕工件的少量包装件允许非常快速的冷却，而不需要向这些小型蒸馏器施加冷却液体，因此整个涂布操作非常适合于涂覆应在使用前进行固溶热处理的镍基超级合金， 快速冷却有或没有随后的老化。 然后扩散涂层可以在固溶热处理条件下进行。 可以使用管状蒸馏器。
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