United Technologies Corporation

Carrier Corporation

Harry E Eaton

Richard C Novak

Ellen Y Sun

Philip H McCluskey

James William Bush

Keshava Basavapatna Kumar

Clark VanTine Cooper

Hussein Ezzat Khalifa

Reng Rong Lin

Ronald T Drost

Hong Du

John E Holowczak

Stephen Chin

Tania Bhatia

Alfred P Matarese

Paula R DeBlois, Legal Representative

Shantikumar V Nair

Thomas H Lawton

Greg C Ojard

Wayde R Schmidt

Blair A Smith

Xia Tang

David C Jarmon

David A Condit

John G Smeggil

John J Brennan

Charles A Ellis

Raymond L DeBlois

William C Reinfelder

Glenn A Cotnoir

George E Foster

James A Cook

Daniel R Godin

Neil R Baldwin

William F Otfinoski

Matthew J Wallace

Alan J Scharman

Gary D Linsey

H David Harter

Joseph L Mattavi

James M Goodman

Yasser A Gowayed

Paula R DeBlois

Raymond Deblois

A process for applying an oxidation resistant coating to an article includes the steps of mixing at least about 10% by volume to up to about 99% by volume of a slurry at least one silica based material having a viscosity of about 1&#xd7;10poise to about 1&#xd7;10poise at a temperature of about 1,292&#xb0; F. (700&#xb0; C.) to about 3,272&#xb0; F. (1,800&#xb0; C.) at least about 1% by volume to up to about 90% by volume of the slurry at least one oxygen scavenger, and a liquid medium to form the slurry; coating an article with the slurry to form a slurry coated article; and heat treating under an inert atmosphere the slurry coated article to form an article having at least one oxidation resistant coating layer containing the at least one oxygen scavenger.

Oxidation resistant coatings, processes for coating articles, and their coated articles

A process for preparing a silicon based substrate with a protective coating having improved thermal resistance at temperature up to at least 1500&#xb0; C., and the resulting article.

Thermal resistant environmental barrier coating

A screw machine () has a rotor housing () defining overlapping bores (--). Female rotor () is located in bore (-) and male rotor () is located in bore (-). A wear resistant coating is deposited on the tips (--) of the rotors. A conformable coating is deposited on the valleys (--) of the rotors. A conformable coating is depsoited on the surface of the bores coacting with the rotors.

Screw machine

An article comprises a silicon based substrate, a bond layer and a protective top layer. The top layer is selected from the group consisting of rare earth disilicates, yttrium disilicates, rare earth monosilicates, yttrium monosilicates, silica and mixtures thereof. The protective layer described above is used in combination with a bond layer provided between the protective layer and the silicon based substrate which functions as oxygen getter and includes an oxygen gettering agent. By oxygen gettering agent is meant a refractory metal oxide former which forms an oxide at operational condition of (high temperature and aqueous environment) having a melting point of greater than 1500&#xb0; C. wherein the negative free energy of formation of the refractory metal oxide from the refractory metal is more than 100 Kcal/mole. Suitable oxygen gettering agents include silicon and other refractory metals. An oxygen gettering agent may also be added to the protective layer.

Environmental barrier coating for silicon based substrates

A bond layer for use on a silicon based substrate. The bond layer comprises an alloy comprising a refractory metal disilicide/silicon eutectic. The refractory metal disilicide is selected from the group consisting of disilicides of molybdenum, chromium, hafnium, niobium, tantalum, rhenium, titanium, tungsten, uranium, vanadium, yttrium and mixtures thereof. The refractory metal disilicide/silicon eutectic has a melting point of greater than 1300&#xb0; C.

Bond coat for silicon based substrates

A bond layer and a further layer on the bond layer, the bond layer comprising a silicon layer having a dispersion of fibers, wherein at least some of the fibers extend between the bond layer and the further layer. The fibers are formed from a material selected from the group consisting of (1) alumina, (2) yttria, (3) aluminum silicate, (4) silicon carbide, (5) silicon nitride, (6) compounds of rare earth elements, alkaline earth elements, aluminum, silicon, oxygen, yttrium, nitrogen, niobium, tantalum, hafnium, zirconium, carbon and mixtures of (1) thru (6).

Bond layer for silicon containing substrate

A screw machine () has a rotor housing () defining overlapping bores (--). Female rotor () is located in bore (-) and male rotor () is located in bore (-). A wear resistant coating is deposited on the tips (--) of the rotors. A conformable coating is deposited on the valleys (--) of the rotors. A conformable coating is deposited on the surface of the bores coacting with the rotors.

A bond layer for a silicon based substrate comprises a mixture of a first phase and a second phase, wherein the first phase is selected from the group consisting of refractory metal oxides, refractory metal silicates and mixtures thereof and the second phase is selected from the group consisting of refractory metal oxide forming metals, SiC, SiNand mixtures thereof.

Environmental barrier coating for silicon based substrates such as silicon nitride

A bond layer for a silicon based substrate comprises a silicon layer having a dispersion of particulate material therein, wherein the particulate material is selected from the group consisting of (1) alumina, (2) yttria, (3) aluminum silicate, (4) compounds of rare earth elements, alkaline earth elements, aluminum, oxygen, yttrium, nitrogen, niobium, tantalum, hafnium, zirconium, carbon, silicon and mixtures thereof.

A barrier layer for a silicon containing substrate which inhibits the formation of gaseous species of silicon when exposed to a high temperature aqueous environment comprises a barium-strontium aluminosilicate includes an aluminosilicate of Group IIA and/or Group IIIB and a Group VB oxide.

Barrier layer for silicon containing substrate

An article comprising a substrate containing silicon and at least one layer which contains a coefficient of thermal expansion (CTE) tailoring additive in an amount sufficient to maintain a compatible CTE with at least one adjacent layer and the substrate.

Silicon based substrate with a CTE compatible layer on the substrate

An article comprising a substrate containing silicon and at least one barrier layer which functions as a thermal barrier at temperatures in excess of 1300&deg; C. in aqueous environments.

Silicon based substrate with environmental/thermal barrier layer

A screw machine ( ) has a rotor housing ( ) defining overlapping bores ( - - ). Female rotor ( ) is located in bore ( - ) and male rotor ( ) is located in bore ( - ). A wear resistant coating is deposited on the tips ( - - ) of the rotors. A conformable coating is deposited on the valleys ( - - ) of the rotors. A conformable coating is depsoited on the surface of the bores coacting with the rotors.

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Woodstock, CT, United States of America

Harry E Eaton