Abstract: A paint system and process are disclosed for hardfacing metal surfaces. In one embodiment of the process, a paint including a dispersion of hard particles is first applied as a coating to a surface. Next, a paint including a dispersion of a braze alloy is applied over the layer of hard particles. The surface is then heated to cause the braze alloy to melt and infiltrate into the hard particles thereby bonding them to the metallic surface. In another embodiment, a first layer of adhesive is applied, and a hardfacing powder is applied onto the adhesive. Then a second layer if adhesive is applied, and a braze alloy powder is applied onto the second adhesive. Then the material is heated as in the first embodiment. In another embodiment, paint containing hard particles is coated onto the substrate, and an acid-containing cross-linked copolymer in the paint is then neutralized to increase the viscosity of the paint to prevent running.

Abstract: A paint system and process are disclosed for hardfacing metal surfaces. In one embodiment of the process, a paint including a dispersion of hard particles is first applied as a coating to a surface. Next, a paint including a dispersion of a braze alloy is applied over the layer of hard particles. The surface is then heated to cause the braze alloy to melt and infiltrate into the hard particles thereby bonding them to the metallic surface. In another embodiment, a first layer of adhesive is applied, and a hardfacing powder is applied onto the adhesive. Then a second layer of adhesive is applied, and a braze alloy powder is applied onto the second adhesive. Then the material is heated as in the first embodiment. In another embodiment, paint containing hard particles is coated onto the substrate, and an acid-containing cross-linked copolymer in the paint is then neutralized to increase the viscosity of the paint to prevent running.

Abstract: A method of making a silicon alloy, and preferably a ferrosilicon alloy, having a controlled calcium content and optionally rare earth constituents wherein the calcium and rare earth constituents are separately introduced into the ferrosilicon smelting furnace in briquette form. The calcium briquettes comprise a compressed and cured mixture of calcium carbonate, preferably in the form of pulverized limestone, a carbon source, such as carbon black, and a binder. The briquetted calcium carbonate dissociates as it is heated during its descent in the smelting furnace and transforms to calcium oxide. The resultant calcium oxide reacts with the carbon in the briquette in the high temperature smelting zone to yield calcium carbide which then reacts with silica to form calcium silicide which then enters into solution with the molten ferrosilicon alloy.

Abstract: An air purification system chills incoming air to condense water and toxic gases, adsorbs toxic molecules, reheats the air to reduce its relative humidity, and then converts oxidizable contaminants into carbon dioxide with an oxidation catalyst.

Abstract: Articles of manufacture having good green strength and low modulii of elasticity, and comprising a matrix of fibrillated polytetrafluoroethylene interconnecting and entrapping a high volume, at least about 85%, of a particulate and preferably a sinterable material selected from the group consisting of metals, intermetallic compounds, ceramics, salts, plastics, and combinations thereof. Said articles are formed by mechanically working a substantially dry mixture of a fibrillable polytetrafluoroethylene polymer and a high volume, at least about 85%, of the particulate material. Metal, ceramic and plastic articles prepared by heat treating, such as sintering, the articles of manufacture are also disclosed.The heat treated products are useful, inter alia, as structural elements and electronic components.

Abstract: Disclosed are gasket and seal materials comprising particulate material interconnected and entrapped by fibrillated polytetrafluoroethylene and methods for manufacturing and using them.

Abstract: Described are fluid processing devices primarily intended for filtration but which devices may also be used for dispensing or sparging liquids and gases into a body of fluid medium. According to the method of using the disclosed devices, fluid medium to be filtered is caused to flow over the active filtering surfaces of a filter medium, such as by rotating the filter element in the fluid medium, while the fluid medium is simultaneously caused to pass through the filter element. At predetermined intervals the fluid medium flow through the filter is reversed or backpulsed.Also disclosed are porous elements of laminated structure in propeller or disc configurations which may be coated with microporous active surfaces to permit filtration of extremely small sized particles from a fluid medium or dispensing of extremely small sized bubbles of gas or droplets of liquid into a body of fluid medium.

Abstract: A sintered filter element for mechanically separating suspended matter from a liquid or gaseous fluid medium to clarify same, comprising at least two laminated, porous, plate-like filter structures having relatively large planar front and rear surfaces joined by relatively small edge surfaces arranged substantially parallel to each other and spaced up to about five, preferably less than one, inches apart. Each filter structure comprises at least two contacting and adhered, substantially coextensive porous layers whose pores are in open communication over substantially all of the interface between their contiguous surfaces so as to permit flow of the fluid medium from one layer to the other. One of the layers is a retention layer for the suspended matter having a pore size sufficiently small substantially to prevent passage of the suspended matter to be removed from the fluid medium and the other of said layers is a supporting layer having a pore size larger than the pore size of the retention layer.