Abstract:
High-temperature fabrics with a coatings to provide oxidation protection at high temperatures, and capable of being formed into a variety of softgoods parts, and methods for their manufacture are disclosed.
Abstract:
A lightweight cementitious composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 10 to 50 volume percent of sand and/or other fine aggregate, where at least a portion of the sand and/or fine aggregate has a fineness modulus of less than 2; where the sum of components used does not exceed 100 volume percent, and where after the lightweight cementitious composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The cementitious composition can be used to make concrete masonry units, construction panels, road beds and other articles.
Abstract:
The invention concerns a method for metal coating of fibres (15) by liquid process, said method being particularly but not exclusively designed for coating in thick and even layers (22) with metals and metal alloys having high melting point and reactivity. Said method is characterised in that it consists in moving along the stretched fibre (15) in the liquid metal maintained in levitation in a well (1), said fibre (15) passing through orifices (6, 7) provided in the well (1) wall (3), said orifices (6, 7) being arranged on either side of the liquid metal at places where the liquid metal (10) is not in contact with said wall (3).
Abstract:
A process is disclosed for depositing diamond onto a shaped article by chemical vapor phase deposition, which includes placing the shaped article in a suspension of an abrasive powder (e.g., diamond powder) in a liquid (the material of said powder having a hardness greater than the hardness of the material of the shaped article), agitating the suspension containing the shaped article for a time sufficient for the surface of the shaped article to become abraded, removing the shaped article from the suspension and drying it, and then carrying out the chemical vapor phase deposition of the diamond. Also disclosed are diamond-coated shaped articles (e.g., diamond-coated graphite fibers having fiber diameters less than about 100 microns).
Abstract:
A method of placing a concrete compositions including a) combining 3 - 40 volume percent cement, 5 - 50 volume percent fine aggregate, 5 - 50 volume percent coarse aggregate, and 10 - 22 volume percent water; b) adding 1.5 - 40 volume percent of prepuff particles to form a concrete composition; and c) pumping the concrete composition to a point higher in elevation than the delivery point of the concrete to place the concrete. The concrete composition contains less than 30 volume percent of other light weighting aggregates and the prepuff particles have an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.02 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3. The slump value of the placed concrete measured according to ASTM C 143 is greater than 1 inch and the concrete has a density of from about 40 to about 135 lb./ft 3 .
Abstract:
A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate, where the particles contain an antimicrobial agent; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, dining tables, counter surfaces, bench tops, and/or examination tables as well as other articles.
Abstract:
A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate, where the particles contain an antimicrobial agent; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, dining tables, counter surfaces, bench tops, and/or examination tables as well as other articles.
Abstract:
Ceramic fibers having a coating of activated carbon thereon are disclosed. A process involving coating the ceramic fibers with a carbon source, carbonizing the fibers, and then activating the carbon makes the fibers. The preferred carbon source is asphalt in the form of an aqueous emulsion or a solution. The activated, carbon coated ceramic fibers have excellent filtering properties especially at high temperatures. They perform as well as carbon fibers and have the advantage of lower cost and fewer production difficulties. Conventional carbon fibers are expensive and difficult to produce.
Abstract:
A ceramic fibre is made by spinning a plurality of polymeric materials each including at least one ceramic precursor into a composite fibre, and then pyrolysing the composite fibre to form a composite ceramic fibre of non-homogeneous composition. A preferred ceramic material for use in this method is made by pyrolysing an organo-metallic compound dispersed in an organic polymer carrier. The principal products are tailored matrix-compatible ceramic fibres for reinforcements, and have a core-sheath structure made by coaxial spinning methods. A core of desired mechanical properties, such as silicon carbide, is given a chemically appropriate surface layer. Transition metal compounds are preferred, in a range of organo-metallic ceramic precursors that include carborane derivatives. Allowed additives include metal-silicon compounds, other ceramics, corresponding metal oxides and elementary metals.