公开(公告)号：US06537388B1

公开(公告)日：2003-03-25

申请号：US09698856

申请日：2000-10-27

申请人： Kim A. Wynns ,  George T. Bayer

发明人： Kim A. Wynns ,  George T. Bayer

IPC分类号： C23C806

CPC分类号： C23C10/60 ,  C10G9/203 ,  C23C10/56 ,  C23C14/046 ,  C23C26/00 ,  Y02T50/67

摘要： Chromium, silicon, aluminum, and optionally manganese are diffused onto the surface of a high temperature alloy product, to provide a coating having improved resistance to carburization and catalytic coke formation and smoother surfaces for high temperature hydrocarbon environments. Preferably, a first layer of chromium or chromium and silicon is deposited and diffusion heat-treated and covered by the second layer of aluminum or aluminum-silicon. The inner layer contains a minimum of 8 weight percent chromium above that contained in the substrate alloy. The outer layer contains a minimum of 20 weight percent aluminum at the coating surface. The coating system is then aged to yield the improved coating that has 60 to 90 weight percent chromium at the surface. Each layer or the combination of layers is diffusion heat treated to cause a diffusion depth ranging from 0.006 inch (0.1524 millimeter) to 0.030 inch (0.762 millimeter) with targeted 0.012 inch (0.3048 millimeter) to 0.015 inch (0.3810 millimeter). The aging process to achieve the desired chromium and manganese migration is 700° C. to 1150° C. (1292° F. to 2102° F.). This diffusion alloy system is weldable after process and after aging. This coating system provided enhanced carburization resistance, resistance to catalytic coke formation, and surface smoothness.

摘要翻译： 铬，硅，铝和任选的锰扩散到高温合金产品的表面上，以提供具有改善的渗碳和催化焦炭形成的耐受性的涂层和用于高温烃环境的平滑表面。 优选地，沉积第一层铬或铬和硅，并进行扩散热处理并被第二层铝或铝 - 硅覆盖。 内层含有比底物合金中含有的铬重量少至少8重量％。 外层在涂层表面含有至少20重量％的铝。 然后将涂层体系老化以产生在表面上具有60至90重量％铬的改进的涂层。 各层或层的组合进行扩散热处理，使得扩散深度范围为0.006英寸（0.1524毫米）至0.030英寸（0.762毫米），目标为0.012英寸（0.3048毫米）至0.015英寸（0.3810毫米）。 实现期望的铬和锰迁移的老化过程是700℃至1150℃（1292°F至2102°F）。 该扩散合金系统在工艺和老化后可焊接。 该涂层体系提供了增强的耐渗碳性，耐催化焦炭形成和表面平滑性。

公开(公告)号：US06592941B1

公开(公告)日：2003-07-15

申请号：US08745199

申请日：1996-11-08

申请人： George T. Bayer ,  Kim A. Wynns

发明人： George T. Bayer ,  Kim A. Wynns

IPC分类号： C23C1644

CPC分类号： C23C10/52 ,  Y10T428/12458 ,  Y10T428/12736

摘要： A method of forming an aluminum silicon diffusion coating on a surface of an alloy product utilizes a diffusion mixture containing by weight 1% to 5% aluminum, 0.5% to 5% silicon, 0.5% to 3% ammonium halide activator and the balance an inert filler. The product to be coated is placed in a retort with the diffusion mixture covering the product surfaces to be coated. Upon heating aluminum and silicon will diffuse onto the product surfaces forming the aluminum and silicon diffusion coating.

摘要翻译： 在合金产品的表面上形成铝硅扩散涂层的方法利用含有1％至5％铝，0.5％至5％硅，0.5％至3％卤化铵活化剂的扩散混合物，余量为惰性 填料。 将待涂覆的产品放置在蒸煮器中，扩散混合物覆盖待涂覆的产品表面。 在加热时，铝和硅将扩散到形成铝和硅扩散涂层的产品表面上。

公开(公告)号：US6165286A

公开(公告)日：2000-12-26

申请号：US305551

申请日：1999-05-05

申请人： George T. Bayer ,  Kim A. Wynns

发明人： George T. Bayer ,  Kim A. Wynns

IPC分类号： C23C4/18 ,  C22F1/04

CPC分类号： C23C4/18

摘要： A method of aluminum diffusion coating the surface of an iron-, nickel-, cobalt-, or titanium-base alloy product begins with cleaning and providing an anchor profile on the surface of the product, followed by depositing with an appropriate thermal spray method at least 4 mils (0.1016 millimeters) thickness of a minimum 85 wt. % aluminum alloy, which can also contain up to 12 wt. % silicon. A MCrAlX-type coating layer is also thermally sprayed on the substrate surface before the aluminum alloy is sprayed. The thermal sprayed products are heat treated in a sealed retort at a temperature of between 900.degree. F. and 1200.degree. F. (482.degree. C. and 649.degree. C.) and then maintained at that temperature for a period of at least one hour to ensure the formation of a strong metallurgical bond between the aluminum alloy layer and the product. The retort temperature is then elevated to between 1400.degree. F. and 2000.degree. F. (760.degree. C. and 1093.degree. C.) and held at that temperature for between 0.17 hour (10 minutes) and 7 hours to cause the diffusion of the aluminum alloy surface layer and subsequent formation of an aluminum diffusion coating. A further treatment step after diffusion heat treatment can be conducted to form a surface oxide, nitride, or combination surface layer. Abrasive blasting of the finished aluminum diffusion coated product may be done to remove any residual aluminum alloy overlay remaining on the coating surface and to provide an improved surface finish and appearance.

摘要翻译： 铁，镍，钴或钛基合金产品表面的铝扩散涂覆方法从清洁开始，并在产品表面上提供锚固轮廓，然后以合适的热喷涂法沉积 最小4密耳（0.1016毫米）厚度最小85重量％ ％铝合金，其也可以含有最多12重量％ ％硅。 在喷涂铝合金之前，MCrAlX型涂层也在基材表面上喷涂。 热喷涂产品在密封的蒸煮器中在900°F至1200°F（482°C和649°C）之间进行热处理，然后在该温度下保持至少1小时 以确保在铝合金层和产品之间形成强烈的冶金结合。 然后将蒸煮温度升至1400°F至2000°F（760°C和1093°C），并在该温度下保持0.17小时（10分钟）至7小时，导致 铝合金表面层，随后形成铝扩散涂层。 可以进行扩散热处理后的另外的处理步骤，以形成表面氧化物，氮化物或组合表面层。 可以对完成的铝扩散涂覆产品进行磨料喷砂以除去残留在涂层表面上的任何残留的铝合金覆层，并提供改进的表面光洁度和外观。

公开(公告)号：US5972429A

公开(公告)日：1999-10-26

申请号：US962753

申请日：1997-11-03

申请人： George T. Bayer ,  Kim A. Wynns

发明人： George T. Bayer ,  Kim A. Wynns

IPC分类号： C23C10/52 ,  C23C10/54 ,  C23C16/22

CPC分类号： C23C10/52 ,  C23C10/54

摘要： A method of diffusion coating a surface of an alloy product containing at least 5 wt. % iron with a chromium-silicon coating uses a dual activator containing a fluoride salt and a chloride salt, at least one of those salts particularly being ammonium chloride or another ammonium halide salt. The pack mix contain at least 20% chromium and a chromium to silicon ratio of at least 10 to 1. The workpiece is heated to at least 2050.degree. F. to obtain a coating of at least 10 mils which contains at least 30% chromium. Upon heating the ammonium salt will form a reducing environment containing molecular hydrogen. The presence of molecular hydrogen speeds up the chemical reactions by an additional reduction reaction to create the surface coating which enables the coating reactions to occur shorter hold times.

摘要翻译： 一种扩散涂覆合金产品表面的方法，该合金产品含有至少5wt。 具有铬 - 硅涂层的％铁使用含有氟化物盐和氯化物盐的双重活化剂，这些盐中的至少一种盐，特别是氯化铵或另一种卤化铵盐。 包装混合物含有至少20％的铬和至少10:1的铬与硅的比例。将工件加热至至少2050°F，以获得至少10密耳的涂层，其中含有至少30％的铬。 加热后，铵盐将形成含有分子氢的还原环境。 分子氢的存在通过额外的还原反应加速化学反应，产生表面涂层，使涂层反应发生更短的保持时间。

公开(公告)号：US5873951A

公开(公告)日：1999-02-23

申请号：US702175

申请日：1996-08-23

申请人： Kim A. Wynns ,  George T. Bayer

发明人： Kim A. Wynns ,  George T. Bayer

IPC分类号： C10G9/20 ,  C23C10/56 ,  C23C10/60 ,  C23C14/04 ,  C23C26/00 ,  C23C22/70 ,  B05D1/36

CPC分类号： C23C26/00 ,  B01J19/02 ,  C10G9/203 ,  C23C10/56 ,  C23C10/60 ,  C23C14/046 ,  B01J19/1825 ,  B01J2219/0236 ,  B01J2219/0286

摘要： The inner surface of ethylene furnace tubes is diffusion coated with a sufficient amount of chromium or chromium and silicon to form a first coating having a thickness of at least two mils. This coating is then cleaned, neutralized, and grit blasted. Then a second coating of a sufficient amount of aluminum or aluminum and silicon is diffused onto the first coating to form a total coating thickness of at least five mils. The surface of the second coating is cleaned and polished to remove the nickel and iron-rich overlay which is present as a result of the coating process and to provide a smooth uniform surface. When ethelyene is produced using furnace tubes which are coated in this manner less coking occurs.

摘要翻译： 乙烯炉管的内表面被扩散涂覆有足够量的铬或铬和硅以形成具有至少2密耳厚度的第一涂层。 然后将该涂层进行清洁，中和并进行喷砂处理。 然后将足够量的铝或铝和硅的第二涂层扩散到第一涂层上以形成至少五密耳的总涂层厚度。 第二涂层的表面被清洁和抛光以除去作为涂覆工艺的结果而存在的富含镍和铁的覆盖物并提供光滑均匀的表面。 当使用以这种方式涂覆的炉管制造乙烯时，发生少焦化。