Exxon Research and Engineering Company

Avco Corporation

Textron Systems Corporation

Richard C Krutenat

Richard S Polizzotti

Raymond J Suplinskas

Harold D Kimrey, Jr

William B Snyder, Jr

Garrett S Thurston

Donald F Connors, Jr

Thomas J Carroll

David T Scaringella

Chih-an Liu

Bernard H Kear

Horst Witzke

John P Dismukes

Michael J Humphries

Robert S Barnard

Narasimha-Rao V Bangaru

A porous preform is densified by heating while emersed in a precursor liquid. Heating is achieved by passing a current through the preform or by an induction coil immersed in the liquid. Ways to control the densification process are also described.

Method for densification of porous billets

Apparatus for heating a fiber using microwave energy. The apparatus has a source of microwave energy feeding and applicator. The applicator is configured to concentrate the microwave energy on a chamber holding a fiber. Fibers made or coated using chemical vapor deposition in the apparatus are also disclosed.

Microwave fiber coating apparatus

Apparatus for densification of porous billets

The present invention relates to a novel process for producing silicon and/or aluminum containing iron alloy product as well as the material produced from same in either sheet or bulk structure form for electromagnetic circuit application. The process entails modifying an iron feedstock containing less than about 2.5 wt % silicon, aluminum or a combination thereof. The process further consists of diffusion of silicon or silicon and aluminum or aluminum into an iron feedstock by a pack diffusion or a chemical vapor deposition method in which the iron feedstock is heated to a temperature at which diffusion occurs in the presence of a pack containing silicon and/or aluminum sources, a reducing agent, a catalyst, and a filler, or in the presence of a flowing gas stream containing a volatile silicon compound. The resulting iron alloy product, which has a silicon content in the range of 0.25%--7% silicon, and an aluminum content in the range of about 0%--4% aluminum, has favorable properties for motor and transformer applications.

Electrical steels and method for producing same

A process for diffusing silicon into iron or iron alloy by heating the iron or iron alloy with silica and a suitable reducing agent in the presence of a catalyst.

Diffusion of elements into steel by catalyzed oxide reduction

A process for the co-diffusion of aluminum and other elements into austenitic steel which includes heating the steel to a temperature at which co-diffusion occurs in the presence of a source of aluminum, a catalyst and metallic or metalloid elements having substantial solubility in ferrite (bcc phase of iron or iron alloy) so that a microstructure is formed on the steel which is a single layer composite and which includes a fine dispersion of compatible aluminide particles in a continuous ductile ferrite matrix.

Aluminide dispersed ferrite diffusion coating on austenitic stainless

A high temperature oxidation resistant alloy of MCrAlY, where M is a base metal comprising iron, cobalt, nickel or a combination thereof, is formed by laser cladding of a coating layer to a substrate.

MCrAlY cladding layers and method for making same

A method of coating metal substrates with a protective aluminum-silicon coating comprising a mixture of (1) an Al-Si eutectic, Al-Si hypereutectic or elemental aluminum and (2) elemental silicon, the articles of manufacture provided by said coating and the method of carrying out thermal hydrocarbon processing operations where corrosion/erosion and other high temperature interactions are a problem using apparatus containing said coatings.

Method of forming a protective aluminum-silicon coating composition for

Protection of cast austenitic stainless steel tubes is provided against initiation of carburization by (a) cold-working the inner surfaces of said tubes to deform the surface to such a degree that upon the subsequent heat treatment of step (b) below, dissolution of the M.sub.23 C.sub.6 carbides in the deformed region is accompanied by recrystallization resulting in a refined micrograin structure in the deformed regions to a substantially uniform minimum depth of about 20 microns; and (b) heating the cold-worked inner surfaces of said tubes, for an effective amount of time, at a temperature between its recrystallization temperature and its melting temperature, in an atmosphere of which the oxygen partial pressure is at least oxidizing with respect to chromium.

Carburization resistance of austenitic stainless steel tubes

A process, and the compositions produced thereby, wherein an element characterized as aluminum, silicon or chromium, notably aluminum, is alloyed in relatively small concentrations with iron, cobalt or nickel, notably iron or cobalt, or both, which have relatively high Curie temperatures. Small amounts of yttrium, hafnium, zirconium or lanthanium can also be added. Alloys of specified composition are formed into particles of selected size, and the particles then contacted in an atmosphere of controlled oxygen activity at elevated temperature over selected time periods. By treatment with a low oxygen-containing, or low moisture-containing gas an oxide of the alloying element is formed which diffuses to the surface of the particles to form a film. The addition of these elements to the base metal necessarily, and unavoidably reduces the Curie temperature of the metal. However, by limiting the particle size and the amount of oxidation of the alloys, a relatively thin impervious oxide film can be formed on the surface of the alloy particle, and much of the lost Curie temperature can be recovered by the increased magnetization which occurs at the particle core when the oxidized form of the metal migrates, or diffuses, to the surface of the particle.

Growing community of inventors

Belmont, MA, United States of America

Richard C Krutenat