Patents by Inventor Robert Vassen
Robert Vassen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7998601Abstract: A method produces thermal barrier coatings that adhere to components even at high temperatures and temperatures that change frequently. A gas-tight glass-metal composite coating is applied to the component and annealed. The corroded part of the gas-tight coating is then removed, and a second, porous coating is applied. The second coating can comprise a ceramic, in particular yttrium-stabilized zirconium oxide. A thermal barrier coating is provided that is a composite made of a gas-tight glass-metal composite coating and another porous coating disposed thereover. Because the boundary volume of the composite coating is partly crystallized to the other coating, superior adhesion within the composite is achieved. Thus, it is in particular possible to produce a composite made of silicate glass-metal composite coatings and yttrium-stabilized zirconium oxide that are temperature-stable for extended periods of time.Type: GrantFiled: October 17, 2006Date of Patent: August 16, 2011Assignee: Forschungszentrum Juelich GmbHInventors: Daniel Emil Mack, Sonja-Michaela Gross, Robert Vassen, Detlev Stoever
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Patent number: 7618911Abstract: A heat-insulating material has a first phase with the stoichiometric composition of 0.1 to 10 mol-% M12O3, 0.1 to 10 mol-% Li2O, and as the remainder M22O3 with possible impurities. M1 is selected from the elements lanthanum, neodymium, gadolinium, or a mixture thereof, and M2 is selected from the elements aluminum, gallium, iron, or a mixture thereof. The first phase is present in a magnetoplumbite structure.Type: GrantFiled: February 11, 2006Date of Patent: November 17, 2009Assignee: Forschungszentrum Julich GmbHInventors: Gerhard Pracht, Robert Vassen, Detlev Stöver
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Patent number: 7585575Abstract: A heat-insulating layer has a melting point above 2500° C., a thermal expansion coefficient in excess of 8×10?6 K?1, and a sintering temperature greater than 1400° C. This material has a perovskite structure of the general formula A1+r(B?1/2+xB?1/2+y)O3+z in which: A=at least one element of the group (Ba, Sr, Ca, Be), B?=at least one element of the group (Al, La, Nd, Gd, Er, Lu, Dy, Tb), B?=at least one element of the group (Ta, Nb), and 0.1<r,x,y,z<0.1.Type: GrantFiled: December 19, 2008Date of Patent: September 8, 2009Assignee: Forschungszentrum Julich GmbHInventors: Robert Vassen, Sigrid Schwartz-Lueckge, Wolfgang Jungen, Detlev Stoever
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Patent number: 7582374Abstract: The aim of the invention is to produce complete high temperature fuel cells by means of thermal injection processes (e.g. atmospheric plasma injection, vacuum plasma injection, high speed flame injection). The production method is especially simplified and is economical by virtue of the fact that the carrier substrate is also produced on a base with the aid of a thermal injection method. The base or an intermediate layer placed thereon can be advantageously dissolved or decomposed such that the carrier substrate provided with layers arranged thereon can be separated in a very simple manner from the base which becomes unnecessary. Said method advantageously enables the production of all layers of a high temperature fuel cell, exclusively with the aid of a thermal injection method.Type: GrantFiled: February 6, 2004Date of Patent: September 1, 2009Assignee: Forschungszentrum Julich GmbHInventors: Robert Vassen, Dag Hathiramani, Hans Peter Buchkremer, Frank Tietz, Jens-Erich Döring, Roberto Siegert, Franziska Traeger, Detlev Stöver
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Publication number: 20090110904Abstract: A method produces thermal barrier coatings that adhere to components even at high temperatures and temperatures that change frequently. A gas-tight glass-metal composite coating is applied to the component and annealed. The corroded part of the gas-tight coating is then removed, and a second, porous coating is applied. The second coating can comprise a ceramic, in particular yttrium-stabilized zirconium oxide. A thermal barrier coating is provided that is a composite made of a gas-tight glass-metal composite coating and another porous coating disposed thereover. Because the boundary volume of the composite coating is partly crystallized to the other coating, superior adhesion within the composite is achieved. Thus, it is in particular possible to produce a composite made of silicate glass-metal composite coatings and yttrium-stabilized zirconium oxide that are temperature-stable for extended periods of time.Type: ApplicationFiled: October 17, 2006Publication date: April 30, 2009Inventors: Daniel Emil Mack, Sonja-Michaela Gross, Robert Vassen, Detlev Stoever
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Publication number: 20090098390Abstract: A heat-insulating layer has a melting point above 2500° C., a thermal expansion coefficient in excess of 8×10?6 K?1, and a sintering temperature greater than 1400° C. This material has a perovskite structure of the general formula A1+r(B?1/2+xB?1/2+y)O3+z in which: A=at least one element of the group (Ba, Sr, Ca, Be), B?=at least one element of the group (Al, La, Nd, Gd, Er, Lu, Dy, Tb), B?=at least one element of the group (Ta, Nb), and 0.1<r, x, y, z<0.1.Type: ApplicationFiled: December 19, 2008Publication date: April 16, 2009Inventors: Robert VASSEN, Sigrid Schwartz-Luckge, Wolfgang Jungen, Detlev Stover
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Patent number: 7468213Abstract: A heat-insulating material has a melting point above 2500° C., a thermal expansion coefficient in excess of 8×10?6 K?1, and a sintering temperature greater than 1400° C. It has a perovskite structure of the general formula A1+r(B?1/3+xB?2/3+y)O3+z where A=at least one element of the group (Ba, Sr, Ca, Be), B?=at least one element of the group (Mg, Ca, Sr, Ba, Be), B?=at least one element of the group (Ta, Nb), r, x, and z?0, and ?0.1<r, x, y, z<0.1; or of the general formula A1+r(B?1/2+xB?1/2+y)O3+z where A and B? are as above and B?=at least one element of the group (Al, La, Nd, Gd, Er, Lu, Dy, Tb), and ?1.0<r, x, y, z<0.1.Type: GrantFiled: June 10, 2003Date of Patent: December 23, 2008Assignee: Forschungszentrum Julich GmbHInventors: Robert Vassen, Sigrid Schwartz-Lückge, Wolfgang Jungen, Detlev Stöver
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Publication number: 20080277618Abstract: The invention relates to a heat-insulating material, which is phase-stable particularly for high temperatures above 1150° C., especially above 1200° C., and which has a very good long-time stability. The heat-insulating material can exist in a number of phases of which at least one has the magnetoplumbite structure and stoichiometrically contains 0.1 to 10 mol % M12O3, 0.1 to 10 mol % Li2O and, as the remaining, M22O3 with incidental impurities. M1 is selected from the following elements: lanthanum, neodymium and gadolinium or mixtures thereof, and M2 is selected from the following elements: aluminum, gallium, iron or a mixture thereof. A particularly advantageous composition arises for this phase with the composition LaLiAl11O18.5 or LaLi0.5Al11.5O19. By using conventional methods, the heat-insulating material can be applied to the components subjected to a high level of thermal stress, for example, turbine blades.Type: ApplicationFiled: February 11, 2006Publication date: November 13, 2008Inventors: Gerhard Pracht, Robert Vassen, Detlev Stover
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Patent number: 7445851Abstract: A heat-insulating layer system for a metallic structural component, especially for a structural component of a gas turbine such as an aircraft engine, includes an adhesion promoting layer (12), an inner contact layer (14), and an outer cover layer (15) , whereby the adhesion promoting layer (12). is disposed on a surface (11) of the gas turbine structural component (10). The inner contact layer (14) is formed of a zirconium oxide partially stabilized with yttrium or yttrium oxide, and the outer cover layer (15) is formed of a material that consists of at least one component with at least one phase, which stoichiometrically comprises 1 to 80 Mol-% Mx2O3, 0.5 to 80 Mol-% MyO and Al2O3 as a remainder with incidental impurities, wherein Mx is selected from the elements chromium and barium or mixtures thereof, and wherein My is selected from the alkaline earth metals, the transition metals and the rare earths or mixtures thereof.Type: GrantFiled: May 24, 2005Date of Patent: November 4, 2008Assignees: MTU Aero Engines GmbH, Forschungszentrum Juelich GmbHInventors: Christian Friedrich, Wolfgang Wachter, Detlev Stoever, Gerhard Pracht, Robert Vassen, Bilge Saruhan-Brings, Claus-Juergen Kroeder, Uwe Schulz
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Publication number: 20080193674Abstract: The invention relates to a method for producing a tight crystalline mullite layer on a metallic and/or ceramic substrate by using the plasma spraying technique. To this end, a sol containing mullite precursors with a proportion of 2 to 25% by weight with regard to the oxides (3 Al2O3/2 SiO2) is used as a spraying additive. This method is carried out under atmospheric conditions, and the sol is injected with a focussed jet and with an overpressure of at least one I bar into the plasma flame. An additional compacting of the layer can be advantageously effected by repeatedly passing over the layer with the plasma flame. The method is particularly suited for applying a gas-tight crystalline mullite layer to a steel substrate.Type: ApplicationFiled: September 17, 2005Publication date: August 14, 2008Inventors: Roberto Siegert, Silke Latzel, Ralf Hansch, Detlev Stover, Robert Vassen
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Publication number: 20070259126Abstract: The invention relates to a method for the production of a thin dense ceramic layer on a substrate by means of atmospheric plasma spraying, whereby the following steps are carried out: a) the substrate is pre-heated to a temperature corresponding to at least a quarter of the melting point of the ceramic for application in Kelvin, b) a ceramic powder or a ceramic powder mixture with d50-values of less than 50 gm is used as spray adjunct, c) particle speeds at incidence on the substrate of more than 200 m/s are set, d) particle temperatures are set such that on incidence on the substrate surface the particles have a temperature at least 5% above the melting point of the ceramic for application in Kelvin, e) the amount of the spray adjunct and passage speed of the plasma burner are set such that on a single pass of the substrate a layer thickness of less than 100 ?m is achieved, f) a thin and also gas-tight layer is generated on the substrate with a single pass of the substrate which has a leakage rate of less thType: ApplicationFiled: August 4, 2005Publication date: November 8, 2007Inventors: Robert Vassen, Dag Hathiramani, Deltev Stover
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Publication number: 20070248764Abstract: The invention relates to a heat-insulating layer system for metallic structural components, especially for structural components of a gas turbine such as an aircraft engine. The heat-insulating layer system (13) comprises an inner contact layer (14) and an outer cover layer (15), whereby the inner contact layer (14) is applied onto a surface (11) of a gas turbine structural component (10) with intermediate arrangement of an adhesion promoting layer (12). According to the invention, the inner contact layer (14) is formed of a zirconium oxide partially stabilized with yttrium or yttrium oxide, the outer cover layer (15) is formed of lanthanum hexaaluminate.Type: ApplicationFiled: May 24, 2005Publication date: October 25, 2007Applicants: MTU AERO ENGINES GMBH, FORSCHUNGSZENTRUM JUELICH GMBHInventors: Christian Friedrich, Wolfgang Wachter, Detlev Stoever, Gerhard Pracht, Robert Vassen, Bilge Saruhan-Brings, Claus-Juergen Kroeder, Uwe Schulz
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Publication number: 20070042112Abstract: The aim of the invention is to produce complete high temperature fuel cells by means of thermal injection processes (e.g. atmospheric plasma injection, vacuum plasma injection, high speed flame injection). The production method is especially simplified and is economical by virtue of the fact that the carrier substrate is also produced on a base with the aid of a thermal injection method. The base or an intermediate layer placed thereon can be advantageously dissolved or decomposed such that the carrier substrate provided with layers arranged thereon can be separated in a very simple manner from the base which becomes unnecessary. Said method advantageously enables the production of all layers of a high temperature fuel cell, exclusively with the aid of a thermal injection method.Type: ApplicationFiled: February 6, 2004Publication date: February 22, 2007Inventors: Robert Vassen, Dag Hathiramani, Hans Buchkremer, Frank Tietz, Jens-Erich Doring, Roberto Siegert, Franziska Traeger, Detlev Stover
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Publication number: 20050260435Abstract: The invention relates to a heat-insulating layer made of a heat-insulating material which has a complex perovskite structure, having a melting point greater than 2500° C. and a thermal coefficient of expansion greater than 8*10?6 K?1 in addition to a sintering temperature of more than 1400° C. The inventive heat insulating material is characterised by a first general formula A1+r(B?1/3+xB?2/3+y)03+2, wherein: A=at least one element from the group (Ba, Sr, Ca, Be), B?=at least one element from the group (Mg, Ca, Sr, Ba, Be), B?=at least one element from the group (Ta, Nb) and ?0.1<r, x, y, z<0,1; or by a second general formula A1+r(B?1/2+x, B?1/2 +y)03 +2, wherein: A =at least one element from the group (Ba, Sr, Ca, Be), B?=at least one element from the group (Al, La, Nd, Gd, Er, Lu, Dy, Th), B?=at least one element from the group (Ta, Nb) and ?0, 1<r, x, y, z<0,1.Type: ApplicationFiled: June 10, 2003Publication date: November 24, 2005Inventors: Robert Vassen, Sigrid Schwartz-Luckge, Wolfgang Jungen, Detlev Stover
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Patent number: 6821656Abstract: The invention relates to a material, in particular for a thermal insulation layer, with increased thermal stability, a low heat conductivity and a large thermal coefficient of expansion. According to the invention, said material comprises lanthanides, in particular the elements La, Ce, Nd, Yb, Lu, Er or Tm, which preferably occur as a mixture in a Perovskite structure. Said thermal insulation layer is particularly suitable for replacing thermal insulation layers comprising yttrium stabilized zirconium oxides (YSZ) as the thermal stability thereof is given as well over 1200° C.Type: GrantFiled: May 6, 2003Date of Patent: November 23, 2004Assignee: Forschungszentrum Julich GmbHInventors: Markus Dietrich, Robert Vassen, Detlev Stöver
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Publication number: 20040101699Abstract: The invention relates to a heat insulating layer on a metallic substrate for using for high temperatures, especially for temperatures above 1300° C. Starting with a base of La2Zr2O7, the properties of the heat insulating substance to be used as the heat insulating layer are regularly improved, by substituting lanthanum cations with ions of elements Nd, Eu, Dy, Sm and/or Gd. An additional, at least partial substitution of the zirconium cations by Ce, Hf or Ta is advantageous. Improving the properties results especially in a high thermal coefficient of dilation &agr; and low heat conductivity &lgr;.Type: ApplicationFiled: October 2, 2003Publication date: May 27, 2004Inventors: Robert Vassen, Henry Bosch, Markus Dietrich, Xueqiang Cao, Detlev Stover, Gerhard Pracht
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Publication number: 20040043261Abstract: The invention relates to a material, in particular for a thermal insulation layer, with increased thermal stability, a low heat conductivity and a large thermal coefficient of expansion. According to the invention, said material comprises lanthanides, in particular the elements La, Ce, Nd, Yb, Lu, Er or Tm, which preferably occur as a mixture in a Perovskite structure. Said thermal insulation layer is particularly suitable for replacing thermal insulation layers comprising yttrium stabilised zirconium oxides (YSZ) as the thermal stability thereof is given as well over 1200° C.Type: ApplicationFiled: May 6, 2003Publication date: March 4, 2004Inventors: Markus Dietrich, Robert Vassen, Detlev Stver
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Publication number: 20030148148Abstract: The invention discloses a component with a heat-insulating layer on its surface. The heat-insulating layer comprises a lower region and an upper region. The lower region is situated between the component and the upper region. The lower region consists entirely or predominantly of YSZ or a glass-metal composite material.Type: ApplicationFiled: November 21, 2002Publication date: August 7, 2003Inventors: Markus Dietrich, Robert Vassen, Cao Xueqiang, Detlev Stover
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Patent number: 6180277Abstract: In a dispersoid-reinforced electrode with a net-like open pore structure and a ceramic and a metallic meshwork, ceramic particles with an average particle diameter of less than 100 nm are homogeneously distributed in the metallic network thereby reinforcing the electrode.Type: GrantFiled: May 26, 1999Date of Patent: January 30, 2001Assignee: Forschungszentrum J{umlaut over (u)}lich GmbHInventors: Rolf Wilkenhöner, Robert Vassen, Detlev Stöver, Hans Peter Buchkremer, Werner Mallener