Abstract: Ceramic fibers are prepared from improved preceramic fibers having a core comprising an organosilicon preceramic polymer and at least one co-spun sheath layer comprising a synthetic film-forming polymer.

Abstract: This invention provides a multi-step process for the preparation of ceramic fibers, such as ferrimagnetic spinel fibers which are useful in electromagnetic interaction shielding applications.The process involves subjecting a ceramic powder-filled hollow organic fiber to isostatic pressing, and then pyrolyzing and sintering the compacted fiber to yield a ceramic fiber.

Abstract: This invention provides a process for the preparation of ferrimagnetic spinel fibers composed of crystallites corresponding to the formula:M.sub.1 Fe.sub.2 O.sub.4where M is a divalent metal such as manganese, iron, cobalt, nickel, copper, zinc, cadmium, magnesium, barium, strontium, or any combination thereof.

Abstract: This invention provides a multi-step process for the preparation of ceramic fibers, such as ferrimagnetic spinel fibers which are useful in electromagnetic interaction shielding applications.The process involves subjecting a ceramic powder-filled hollow organic fiber to isostatic pressing, and then pyrolyzing and sintering the compacted fiber to yield a ceramic fiber.

Abstract: This invention provides a spinning process for the preparation of ferrimagnetic spinel fibers composed of crystallites corresponding to the formula:M.sub.1 Fe.sub.2 O.sub.4where M is manganese, iron, cobalt, nickel, copper, zinc, cadmium, magnesium, barium, strontium, or any combination thereof.

Abstract: The present invention provides an improved gel precipitation method for producing a Ni.sub.0.7 Zn.sub.0.3 Fe.sub.2 O.sub.4 type of ferrimagnetic spinel powder which has an average particle size of less than about 1000 angstroms.

Abstract: This invention provides a process for the preparation of ferrimagnetic spinel fibers composed of crystallites corresponding to the formula:M.sub.1 Fe.sub.2 O.sub.4where M is a divalent metal such as manganese, iron, cobalt, nickel, copper, zinc, cadmium, magnesium, barium, strontium, or any combination thereof.

Abstract: A porous sintered plaque is provided with a bimodal porosity that is especially well suited for use as an electrode within a molten carbonate fuel cell. The coarse porosity is sufficient for admitting gases into contact with the reaction surfaces while the fine porosity is wetted with and retains molten electrolyte on the reaction sites. The electrode structure is prepared by providing a very fine powder of such as nickel oxide and blending the powder with a suitable decomposable binder to form a solid mass. The mass is comminuted into agglomerate size particles substantially larger than the fine oxide particles and formed into a cohesive compact for subsequent sintering. Sintering is carried out at sufficient conditions to bind the agglomerates together into a porous structure having both coarse and fine porosity. Where lithiated nickel oxide cathodes are prepared, the sintering conditions can be moderate enough to retain substantial quantities of lithium within the electrode for adequate conductivity.

Abstract: Ceramic shapes having impermeable tungsten coatings can be used for containing highly corrosive molten alloys and salts. The shapes are prepared by coating damp green ceramic shapes containing a small amount of yttria with a tungsten coating slip which has been adjusted to match the shrinkage rate of the green ceramic and which will fire to a theoretical density of at least 80% to provide a impermeable coating.

Abstract: A two-faced necktie is provided having an interior lining comented throughout its breadth to the underside of one of the face layers, the two face layers being stitched together along a line determined by the length and width of the liner, the longitudinal edges of the two face layers beyond the stitch lines being turned in under the liner.