General Electric Company

Baker Hughes Oilfield Operations LLC

Gopi Chandran Ramachandran

Alok Mani Srivastava

Holly Ann Comanzo

William Winder Beers

Prasanth Kumar Nammalwar

Digamber Gurudas Porob

Shankar Madras Venugopal

Mukunda Srinivas Adyam

Venkat Subramaniam Venkataramani

Mohandas Nayak

Shankar Sivaramakrishnan

Vikas Midha

Shalini Thimmegowda

Swarnagowri Addepalli

Anant Achyut Setlur

Wayne Charles Hasz

Timothy John Sommerer

Sergei Ivanovich Dolinsky

Atanu Saha

Larry Steven Rosenzweig

Samuel Joseph Camardello

Venkatesan Manivannan

Florencio Garcia

Eklavya Calla

Helene Claire Climent

Nagaveni Karkada

Wusheng Xu

Mamatha Nagesh

László Balázs

Kristen Hall Brosnan

István Károly Deme

Katalin Toth

Madras Venugopal Shankar

Bala Srinivasan Parthasarathy

Suchismita Sanyal

Shahana Chatterjee

Srinidhi Ramachandra

Prabhakaran Manogharan

Anantharaman Mahalingam

A silicone bond coat composition having a viscosity of less than 1,600 centistokes is applied to substantially all external surfaces of the article and then cured. A liquid silicone elastomer outer coat composition comprising a high viscosity first liquid silicone elastomer formulation and a low viscosity second liquid silicone elastomer formulation is then applied and cured to provide a protected article having a complex shape. Optimal coatings result from a careful balancing of component viscosities. In an embodiment, the first formulation has a viscosity greater than 300,000 centistokes, and the second formulation has a viscosity less than 6,000 centistokes, and the liquid silicone elastomer outer coat composition comprises from about 60 to about 40 percent by weight of the first formulation and from about 40 to about 60 percent by weight of the second liquid silicone elastomer formulation.

Method of protecting an article having a complex shape

A method and an apparatus for detecting photons are disclosed. The apparatus includes a scintillator single crystal and an avalanche photodiode coupled to the scintillator single crystal. The scintillator single crystal is at a temperature greater than about 175&#xb0; C. and at a shock level in a range from about 20 Grms to about 30 Grms. The scintillator single crystal includes a praseodymium doped composition selected from (LaY)2SiO:Pr, ABClX:Pr, A(Li,Na)LaClX:Pr, or any combinations thereof. As used herein A is cesium, rubidium, potassium, sodium, or a combination thereof, B is calcium, barium, strontium, magnesium, cadmium, zinc, or a combination thereof, and X is bromine, iodine, or a combination thereof. Further, (0&#x3c;x&#x3c;1), and (0&#x3c;y&#x3c;3).

Radiation detection apparatus and related method

A method for repairing a Ni-based alloy component includes preparing a surface of the Ni-based alloy component for receiving a cold spray repair; spraying a stream of particles onto a the surface of the Ni-based alloy component to form a coating thereon; and removing any over-spray on the surface of the Ni-based alloy component. The particles are formed from an alloy material having a melting point such that the particles are sprayed at a spray temperature that is less than the melting point of the alloy material.

Method for repairing turbine component by application of thick cold spray coating

An article including a substrate and a plurality of coatings disposed on the substrate is presented. The plurality of coatings includes a thermal barrier coating disposed on the substrate; and a protective coating including a calcium-magnesium-aluminum-silicon-oxide (CMAS)-reactive material disposed on the thermal barrier coating. The CMAS-reactive material includes an NZP-type material. The CMAS-reactive material is present in the plurality of coatings in an effective amount to react with a CMAS composition at an operating temperature of the thermal barrier coating, thereby forming a reaction product having one or both of melting temperature and viscosity greater than that of the CMAS composition. A method of making the article and a related turbine engine component are also presented.

Article and method of making thereof

Articles having coatings that are resistant to high temperature degradation are described, along with methods for making such articles. The article comprises a coating disposed on a substrate. The coating comprises a plurality of elongated surface-connected voids. The article further includes a protective agent disposed within at least some of the voids of the coating; the protective agent comprises a substance capable of chemically reacting with liquid nominal CMAS to form a solid crystalline product outside the crystallization field of said nominal CMAS. This solid crystalline product has a melting temperature greater than about 1200 degrees Celsius. The method generally includes disposing the protective agent noted above within the surface connected voids of the coating at an effective concentration to substantially prevent incursion of CMAS materials into the voids in which the protective agent is disposed.

Articles for high temperature service and method for making

A method of making a core-shell phosphor is provided. The method comprises mixing a lanthanum phosphate (LaPO) core with a shell precursor mixture comprising at least one compound of La, at least one compound of Ce, and at least one compound of Tb to form a core+shell precursor mixture, heating the core+shell precursor mixture to a temperature in a range from about 900&#xb0; C. to about 1200&#xb0; C. with an inorganic flux material in presence of a reductant to provide a heated core+shell precursor mixture, cooling the heated core+shell precursor mixture to ambient temperature to provide a product core-shell phosphor dispersed in the inorganic flux material; and separating the product core-shell phosphor from the inorganic flux material.

Core shell phosphor and method of making the same

Cerium, gadolinium and terbium doped aluminum phosphates of formula I may be used in fluorescent lampsAlTbCeGdLuScInLaGaPO&#x2003;&#x2003;I

Green emitting phosphor

A luminescent material includes an aluminate phosphor of formula IAMgAlO:Eu, R, where&#x2266;0.4, 0&#x2266;&#x2266;1 and 0&#x2266;&#x2266;0.2. A is selected from Ca, Ba, and Sr and combinations thereof. The aluminate phosphor is doped with a rare earth ion (R), which exists in stable multi-valence states in the luminescent material. Ris selected from the group consisting of Sm, Yb, Tm, Ce, Tb, Prand combinations thereof. Phosphors of formula I may be blended with other blue, yellow, orange, green, and red phosphors to yield white light phosphor blends. A lighting apparatus including such a luminescent material is also presented. The light apparatus includes a light source in addition to the luminescent material.

Rare earth doped luminescent material

A method of recovering a rare earth constituent from a phosphor is presented. The method can include a number of steps (a) to (d). In step (a), the phosphor is fired with an alkali material under conditions sufficient to decompose the phosphor into a mixture of oxides. A residue containing rare earth oxides is extracted from the mixture in step (b). In step (c), the residue is treated to obtain a solution, which comprises rare earth constituents in salt form. Rare earth constituents are separated from the solution in step (d).

Rare earth recovery from fluorescent material and associated method

An electron emissive material comprises an alkaline earth metal halide composition and operable to emit electrons on excitation. A lamp including an envelope, an electrode including an alkaline earth metal halide electron emissive material and a discharge material, is also disclosed.

Electrode materials for electric lamps and methods of manufacture thereof

A phosphor comprises europium, at least two alkaline-earth metals, and at least a Group-13 metal. In one embodiment, the phosphor has a formula selected from the group consisting of SrAEuDOand SrAEuDO; wherein A is at least an alkaline-earth metal other than strontium; D is an element selected from the group consisting of Group-13 metals, group-3 metals, and rare-earth metals; 0&#x3c;a&#x3c;4; 0.001&#x3c;z&#x3c;0.3; and 4-a-z&#x3e;0. The phosphor can be used in light sources and displays.

Phosphors containing oxides of alkaline-earth and group-13 metals, and light sources incorporating the same

An electron emissive composition comprises a barium tantalate composition in an amount of about 50 to about 95 wt %; and a ferroelectric oxide composition in an amount of about 5 to about 50 wt %, wherein the weight percents are based on the total weight of the barium tantalate composition and the ferroelectric oxide composition. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition in an amount of about 50 to about 95 wt % with a ferroelectric oxide composition in an amount of about 5 to about 50 wt % to form an electron emissive precursor composition, wherein the weight percents are based on the total weight of the barium tantalate composition and the ferroelectric oxide composition; and sintering the composition at a temperature of about 1000&#xb0; C. to about 1700&#xb0; C.

Composite electrode materials for electric lamps and methods of manufacture thereof

An electron emissive composition comprises a barium tantalate composition of the formula (Ba, Ca, Sr, D)(Ta, W, E, F, G, Ca)Owhere &#x3b4; is an amount of about 0 to about &#x2212;3; and wherein D is either an alkali earth metal ion or an alkaline earth ion; E, F, and G, are alkaline earth ions and/or transition metal ion; x is an amount of up to about 0.7; y is an amount of up to about 1; p and q are amounts of up to about 0.3; and t is an amount of about 0.05 to about 0.10, u is an amount of up to about 0.5, v is an amount of up to about 0.5 and w is an amount of up to about 0.25. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition with a binder; and sintering the barium tantalate composition with the binder at a temperature of about 1000&#xb0; C. to about 1700&#xb0; C.

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Bengaluru, India

Gopi Chandran Ramachandran