United Technologies Corporation

Corning Glass Works

John J Brennan

Karl M Prewo

Kenneth Chyung

Mark P Taylor

Francis S Galasso

Harry E Eaton

David A Condit

Richard D Veltri

Norman S Bornstein

George K Layden

Stephen Chin

Richard C Novak

Lester W Jordan

Charles Orcutt Hulse

Janet Benesh

Alan Rogol

Troy L Zumbrunnen

A barrier layer for a silicon containing substrate comprises an alkaline earth aluminosilcate and an additive component capable of forming a reaction product with silica.

Substrate containing silicon and a barrier layer which functions as a protective/thermal barrier coating

Chemical vapor deposition (CVD) techniques for forming tough silicon carbide (SiC) matrix composites. The introduction of methyldichlorosilane (MDS) to a reactor containing a fiber preform which been flushed with a noble gas, causes the formation of a carbon layer around the fibers. The carbon interlayer improves the fracture toughness of the composite.

CVD SiC matrix composites containing carbon coated fibers

A silicon carbide fiber reinforced glass-ceramic matrix composite article is disclosed. The matrix is a lithium alumino silicate glass-ceramic composition which may include from 1 to 5 weight percent B.sub.2 O.sub.3. The fiber reinforced glass-ceramic matrix composite article exhibits both high flexural strength at elevated temperatures and oxidative stability at elevated temperatures in an oxidizing environment.

Oxidation resistant fiber reinforced composite article

High strength, fracture tough, high temperature oxidatively stable, gas turbine engine core engine components are described made of silicon carbide fiber reinforced ceramic matrix or silicon carbide fiber reinforced glass matrix material. A gas turbine engine containing core engine components as above described is also disclosed.

Gas turbine engine and composite parts

A composite material suitable for use as an abradable seal is described. The seal comprises a high temperature stable fiber reinforced glass or glass-ceramic matrix base having at least one layer of abradable ceramic material, plasma sprayed or bonded to it. The ceramic abradable layer has a working temperature up to at least 3000.degree. F. (1648.degree. C.) and is oxidatively stable. The abradable seal has particular utility in a gas turbine engine.

Lightweight fiber reinforced high temperature stable glass-ceramic

A silicon carbide fiber reinforced barium modified magnesium aluminosilicate matrix composite is described having high strength and thermal stability at temperatures in excess of 1200.degree. C. The matrix material contains about 5% to about 14% magnesium oxide and about 5% to about 25% barium oxide. While any suitable ratios of fiber to matrix can be used, the composite for most applications for example, in the heat engine area, will contain approximately 20% to 50% by volume silicon carbide fibers.

High-strength thermally stable magnesium aluminosilicate glass-ceramic

A silicon carbide fiber reinforced barium modified magnesium aluminosilicate matrix composite is described having high strength and thermal stability at temperature in excess of 1200.degree. C. The matrix material contains about 5% to about 14% magnesium oxide and about 5% to about 25% barium oxide. While any suitable ratios of fiber to matrix can be used, the composite for most applications for example, in the heat engine area, will contain approximately 20% to 50% by volume silicon carbide fibers.

High strength, thermally stable magnesium aluminosilicate glass-ceramic

A silicon carbide fiber reinforced glass-ceramic matrix composite is disclosed having high strength, fracture toughness, and improved oxidative stability even at high temperature use, e.g., in excess of 1000.degree. C. The composite is made up of a plurality of glass-ceramic layers, each layer reinforced with a plurality of unidirectional continuous length silicon carbide or discontinuous SiC fibers. The composite is formed by starting with the matrix material (preferably lithium aluminosilicate) in the glassy state and converting it from the glassy state to the crystalline state after densification of the composite. Ta or Nb compounds are added to the matrix composition prior to consolidation to form a reaction or diffusion barrier around the SiC fiber, resulting in composites with high temperature oxidation stability. Substitution of at least part of the Li.sub.2 O in the matrix with MgO results in an even higher temperature stable composite, e.g., up to about 1200.degree. C.

Reaction inhibited-silicon carbide fiber reinforced high temperature

The impact resistance of hot pressed silicon carbide articles is improved by providing thereon a layer of material resulting from the reaction of silicon in a dilute hydrocarbon gas atmosphere. To form the impact absorbing layer of porous silicon carbide, a silicon powder compact is heated at about 1400.degree. C. in a gas stream comprised predominantly of a carrier gas such as hydrogen, with a reactive hydrocarbon gas such as methane. Unitary articles may also be formed.

Reaction sintered silicon carbide

A compliant tubular liner particularly adapted to withstand brisant forces is disclosed. These liners comprising graphite or silicon carbide fiber reinforced glass or glass-ceramic have a high fracture toughness, a relatively low elastic modulus and a high temperature resistance. These articles are particularly useful as gun barrel liners.

Compliant composite tubular liners of fiber reinforced

The instant invention is directed to the preparation of glass-ceramic bodies exhibiting high strengths and use temperatures up to 1200.degree. C. The bodies consist essentially, expressed in terms of weight percent on the oxide basis, of

Glass-ceramic compositions of high refractoriness

Discontinuous silicon carbide fiber reinforced ceramic composites are disclosed having high strength, fracture toughness, and oxidative stability, even in high temperature oxidative environments. Disclosed composites include silicon carbide fiber reinforced aluminosilicate, lithium aluminosilicate, barium aluminosilicate, magnesium aluminosilicate, and combinations thereof. Flexural strengths in excess of 20,000 psi (138 MPa) at temperatures in excess of 1000.degree. C. are attainable with such composites. The composite is formed by starting with the ceramic matrix material in the glassy state and converting it from the glassy state to the ceramic state after densification of the composite.

Discontinuous silicon carbide fiber reinforced ceramic composites

Discontinuous silicon carbide fiber reinforced glass composites are disclosed having high strength, fracture toughness, and oxidative stability, even in high temperature oxidative environments. Disclosed composites include silicon carbide fiber reinforced borosilicate glass, high silica content glass, and aluminosilicate glass. Flexural strengths in excess of 20,000 psi (138 MPa) at temperatures in excess of 500.degree. C. are attained with such composites.

Discontinuous silicon carbide fiber reinforced glass composites

To prevent corrosion in subsequent high temperature exposure, backers for electron beam hole drilling of nickel base superalloys contain glass particulates of the borosilicate and aluminosilicate types, having an alkali metal oxide content of less than 1 weight percent and a heavy metal (Pb, Bi, Sn, Sb, As) content of less than 25 ppm. Preferably the binder is a soluble inorganic material, such as magnesium dichromate or a polymer, also free of alkali metal content.

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Portland, CT, United States of America

John J Brennan