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    • 1. 发明授权
    • Optical lens and method of preventing clouding thereof at high
temperatures
    • 光学透镜及其在高温下防止其混浊的方法
    • US6014263A
    • 2000-01-11
    • US71109
    • 1998-05-04
    • Jon C. SchaefferNripendra N. DasBrian F. MickleChing-Ho WangMatthew S. TomaszewskiKevin G. McAllister
    • Jon C. SchaefferNripendra N. DasBrian F. MickleChing-Ho WangMatthew S. TomaszewskiKevin G. McAllister
    • G02B1/10G02B27/00G02B3/00
    • G02B27/0006G02B1/105
    • A method for preventing clouding of a lens employed in a high-temperature oxidizing environment, an example of which is a lens of a pyrometer used to sense exhaust gas temperature (EGT) of a gas turbine engine. Clouding is prevented by inhibiting the generation of volatile oxide species that react with high-temperature lens materials, forming deposits including oxides of chromium, molybdenum and other elements having volatile oxide species. The method is particularly directed to a pyrometer whose lens is formed of sapphire (alumina) or silica, and is mounted within a structure formed of a material containing chromium and/or molybdenum, such as a superalloy or stainless steel. The method entails forming an alumina scale-forming barrier coating such as a diffusion aluminide on surfaces of the structure that are subject to oxidation and high temperatures. According to the invention, the alumina scale formed by the barrier coating inhibits the generation of other oxides at the coated surfaces, which would otherwise form volatile oxides that react with and form deposit on the lens. By inhibiting the formation of oxides other than alumina on surfaces surrounding the lens, lens clouding caused from volatile oxides is avoided. As a result, the optical performance of the lens is not degraded, and the precision of a pyrometer employing the lens to sense temperatures is maintained during operation of the engine.
    • 一种用于防止在高温氧化环境中使用的透镜的混浊的方法,其实例是用于感测燃气涡轮发动机的排气温度(EGT)的高温计的透镜。 通过抑制与高温透镜材料反应的挥发性氧化物物质的产生,形成含有铬,钼和其它具有挥发性氧化物的元素的沉积物来防止云层。 该方法特别涉及其透镜由蓝宝石(氧化铝)或二氧化硅形成的高温计,并且安装在由含有铬和/或钼的材料(例如超级合金或不锈钢)形成的结构内。 该方法需要在经受氧化和高温的结构的表面上形成氧化铝垢形成阻挡涂层,例如扩散铝化物。 根据本发明,通过阻挡涂层形成的氧化铝垢阻止了在涂覆表面产生其它氧化物,否则其将形成与透镜反应并形成沉积在透镜上的挥发性氧化物。 通过抑制在透镜周围的表面上形成氧化铝以外的氧化物,避免了由挥发性氧化物引起的透镜混浊。 结果,透镜的光学性能不降低,并且在发动机的操作期间保持采用透镜感测温度的高温计的精度。
    • 5. 发明授权
    • Method for repairing a thermal barrier coating
    • 修补热障涂层的方法
    • US06544346B1
    • 2003-04-08
    • US08886504
    • 1997-07-01
    • Warren D. Grossklaus, Jr.Roger D. WustmanJohn M. PowersJeffrey A. ConnerJon C. Schaeffer
    • Warren D. Grossklaus, Jr.Roger D. WustmanJohn M. PowersJeffrey A. ConnerJon C. Schaeffer
    • B08B704
    • C23G1/20B22D29/002B23P2700/06C23C10/02C23C28/321C23C28/3215C23C28/325C23C28/3455
    • A method of repairing a thermal barrier coating on a component designed for use in a hostile thermal environment, such as turbine, combustor and augmentor components of a gas turbine engine. The method is particularly suited for completely removing a thermal insulating ceramic layer of thermal barrier coating system that includes a metallic bond coat, such as a diffusion aluminide or MCrAlY coating, between the surface of the component and the ceramic layer, while leaving the bond coat substantially undamaged. Furthermore, the method of this invention includes a technique by which ceramic material within cooling holes in the component can be removed without damaging the underlying bond coat. The process steps generally include removing the ceramic layer from the surface of the component by subjecting the ceramic layer to a caustic solution at an elevated temperature and pressure, and then removing ceramic material from the cooling hole by carefully directing a high-velocity fluid stream into the cooling hole. According to this invention, the high-velocity fluid stream is able to overcome the compressive stresses that otherwise anchor the ceramic in the cooling hole, yet does not remove or damage the bond coat underlying the ceramic.
    • 在设计用于恶劣热环境中的部件(例如燃气涡轮发动机的涡轮机,燃烧器和增压器部件)上修复热障涂层的方法。 该方法特别适于完全去除在元件表面和陶瓷层之间包括金属粘合涂层(例如扩散铝化物或MCrAlY涂层)的热障涂层系统的绝热陶瓷层,同时留下粘合涂层 基本没有损坏。 此外,本发明的方法包括可以除去组件内的冷却孔内的陶瓷材料而不损坏下面的粘合涂层的技术。 工艺步骤通常包括通过在升高的温度和压力下对陶瓷层进行苛性碱溶液从部件的表面除去陶瓷层,然后通过小心地将高速流体流引导到冷却孔中,从陶瓷材料中除去陶瓷材料 冷却孔。 根据本发明,高速流体流能够克服否则将陶瓷固定在冷却孔中的压缩应力,但是不会去除或损坏陶瓷下面的粘合涂层。
    • 6. 发明授权
    • Method of improving environmental resistance of investment cast superalloy articles
    • 投资超高合金制品的耐环境性改善方法
    • US06500283B1
    • 2002-12-31
    • US08946017
    • 1997-10-07
    • Jon C. SchaefferWendy H. MurphyNorman R. Lindblad
    • Jon C. SchaefferWendy H. MurphyNorman R. Lindblad
    • C22F110
    • B22C3/00B22C9/10C22F1/10
    • A method for promoting the environmental resistance of nickel, iron and cobalt-base superalloys of the type alloyed to develop a protective oxide scale. The method entails a technique for removing sulfur during or subsequent to the casting operation. The method generally includes casting a superalloy article in a mold cavity, and then heat treating the article while surfaces of the article are in contact with a compound containing a sulfide and/or oxysulfide-forming element, such as yttria, calcium oxide, magnesia, scandia, ceria, hafnia, zirconia, titania, lanthana, alumina and/or silica. The heat treatment is performed at a temperature sufficient to cause sulfur within the superalloy article to segregate to the surfaces of the article and react with the sulfide-forming element, thereby forming sulfides at the interface with the compound. The compound is then removed from the surfaces of the article so as to simultaneously remove the sulfides and any elemental sulfur that have segregated to the surface of the article.
    • 一种促进合金化的镍,铁和钴基超级合金的耐环境性的方法,以形成保护性氧化皮。 该方法需要一种在铸造操作期间或之后除去硫的技术。 该方法通常包括在模腔中铸造超合金制品,然后在制品的表面与含有硫化物和/或氧硫化物形成元素如氧化钇,氧化钙,氧化镁, 猩猩,二氧化铈,铪,氧化锆,二氧化钛,镧,氧化铝和/或二氧化硅。 热处理在足以使超合金制品内的硫分离到制品的表面并与硫化物形成元素反应的温度下进行,从而在与化合物的界面处形成硫化物。 然后将化合物从制品的表面除去,以便同时除去分离到制品表面的硫化物和任何元素硫。
    • 8. 发明授权
    • Thermal barrier coating system and method therefor
    • 热障涂层系统及其方法
    • US5891267A
    • 1999-04-06
    • US783335
    • 1997-01-16
    • Jon C. SchaefferKevin S. O'Hara
    • Jon C. SchaefferKevin S. O'Hara
    • F01D5/28C23C28/00C23C30/00C23C8/10C23C8/20C23C8/80
    • C23C28/042C23C28/00C23C28/044
    • A thermal barrier coating system and a method for forming the coating system on an article designed for use in a hostile thermal environment, such as superalloy turbine, combustor and augmentor components of a gas turbine engine. The coating system includes a carburized zone at the surface of a component on which a thermal barrier coating system is to be formed. An aluminum-rich bond coat is then formed on the carburized surface, followed by oxidation of the bond coat to form an aluminum oxide layer. A thermal insulating ceramic layer is then formed on the oxide layer, so as to be chemically bonded thereto. According to the invention, appropriately carburizing the surface of a component serves to form carbides that tie up refractory metals present in the underlying superalloy substrate of the component, and thereby prevents the detrimental effects of these metals on the bond coat-oxide layer interface. The benefit of the carburized zone is particularly notable where the component is a superalloy containing relatively high levels of one or more refractory metals, such as tantalum, tungsten, molybdenum, rhenium, titanium, chromium, hafnium and zirconium.
    • 一种热障涂层系统和在设计用于恶劣热环境中的物品上形成涂层系统的方法,例如燃气轮机的超级合金涡轮机,燃烧器和增压器部件。 涂层系统包括在其上将要形成热障涂层系统的部件的表面处的渗碳区域。 然后在渗碳表面上形成富铝的粘结涂层,然后氧化粘结涂层以形成氧化铝层。 然后在氧化物层上形成绝热陶瓷层,以便与其化学键合。 根据本发明,组分表面的适当渗碳用于形成结合组分的下层超耐热合金基底中存在的难熔金属的碳化物,从而防止这些金属对粘结涂层 - 氧化物层界面的不利影响。 渗碳区的好处是特别值得注意的是,组分是含有相对高含量的一种或多种难熔金属如钽,钨,钼,铼,钛,铬,铪和锆的高合金。