Abstract: Essentially inorganic monolithic hollow fibers having a radially anisotropic internal void volume wall structure. Process for the production of such fibers. Apparatus and processes using such fibers.

Abstract: Novel bi-metallic filamentary composites are produced by first forming a conjugate precursor filament comprised of an organic polymer together with particles of a first reducible metal oxide and particles of a second reducible metal oxide with the metal component of each of the two metal oxides being sinterable at a temperature which is below the melting point of the other. The structure of the precursor is characterized by a first longitudinally extending layer along its length which contains the particles of the first reducible metal oxide, and an adhering second essentially distinct longitudinally extending layer extending along its length which contains the particles of the second reducible metal oxide. The essentially discrete layers may be in a sheath-core arrangement or in side-by-side relationship.

Abstract: Essentially inorganic monolithic hollow fibers having a radially anisotropic internal void volume wall structure. Process for the production of such fibers. Apparatus and processes using such fibers.

Abstract: Process for the production of small tubing, e.g., hollow fibers comprising(a) preparing a solution of an organic fiber-forming polymer, containing, in a uniformly dispersed form, a sinterable inorganic material;(b) extruding the inorganic material-containing polymer solution through a hollow fiber spinneret;(c) forming a polymeric precursor hollow fiber, laden with the inorganic material;(d) treating the polymeric precursor hollow fiber to remove the organic polymer; and(e) sintering the resulting inorganic material in hollow fiber form.

Abstract: Novel bi-metallic filamentary composites are produced by first forming a conjugate precursor filament comprised of an organic polymer together with particles of a first reducible metal oxide and particles of a second reducible metal oxide with the metal component of each of the two metal oxides being sinterable at a temperature which is below the melting point of the other. The structure of the precursor is characterized by a first longitudinally extending layer along its length which contains the particles of the first reducible metal oxide, and an adhering second essentially distinct longitudinally extending layer extending along its length which contains the particles of the second reducible metal oxide. The essentially discrete layers may be in a sheath-core arrangement or in side-by-side relationship.

Abstract: Essentially inorganic monolithic hollow fibers having a radially anisotropic internal void volume wall structure. Process for the production of such fibers. Apparatus and processes using such fibers.

Abstract: A method is disclosed for making fibrous steel webs or matts from particulate iron oxides with the aid of a fiber-forming acrylic polymer. A plurality of continuous filaments are first formed by wet spinning an acrylic polymer spin dope in which particles of iron oxide are dispersed. The filaments obtained are then converted into a precursor web or matt by conventional textile procedures. This is followed by exposing the precursor to a reducing atmosphere (e.g., a gaseous mixture of hydrogen and carbon monoxide) at a temperature in the range of from about 900.degree. C to 1150.degree. C for a period of about 3 to 8 minutes. Under these conditions, the iron oxide particles are reduced to the metallic state and the polymer in the precursor is pyrolized to carbon and by-product gases. The carbon in the system diffuses into the resulting iron, and the individual metal particles sinter to form a matt of steel wire having a configuration essentially corresponding to that of the precursor.

Abstract: A method for making filamentary steel wire from particulate iron oxides with the aid of a fiber-forming acrylic polymer is disclosed. A precursor filament is first formed by wet-spinning an acrylic polymer spin dope in which particles of iron oxide are dispersed. The resulting precursor filament is then exposed to a reducing atmosphere (e.g., a gaseous mixture of hydrogen and carbon monoxide) at a temperature in the range of from about 900.degree. C. to 1150.degree. C. for a period of about 3 to 8 minutes. Under these conditions, the iron oxide particles are reduced to the metallic state and the polymer in the precursor is pyrolized to carbon and byproduct gases. The carbon diffuses into the resulting metallic iron, and the individual metal particles sinter to form continuous steel wire.The method has the capability of producing steel wire of an essentially ferritic/pearlitic structure with a tensile property in excess of 140,000 psi.

Abstract: Novel bi-metallic filamentary composites are produced by first forming a conjugate precursor filament comprised of an organic polymer together with particles of a first reducible metal oxide and particles of a second reducible metal oxide with the metal component of each of the two metal oxides being sinterable at a temperature which is below the melting point of the other. The structure of the precursor is characterized by a first longitudinally extending layer along its length which contains the particles of the first reducible metal oxide, and an adhering second essentially distinct longitudinally extending layer extending along its length which contains the particles of the second reducible metal oxide. The essentially discrete layers may be in a sheath-core arrangement or in side-by-side relationship.

Abstract: A method for making steel wire cord from particulate iron oxides with the aid of a fiber-forming acrylic polymer is disclosed. A plurality of continuous filaments are first formed by wet-spinning an acrylic polymer spin dope in which particles of iron oxide are dispersed. The resulting filaments are drawn to increase their tenacity and then twisted to form a precursor cord. This is followed by exposing the precursor to a reducing atmosphere (e.g., a gaseous mixture of hydrogen and carbon monoxide) at a temperature in the range of from about 900.degree. C. to 1150.degree. C. for a period of about 3 to 8 minutes. Under these conditions, the iron oxide particles are reduced to the metallic state and the polymer in the precursor is pyrolized to carbon and by-product gases. The carbon diffuses into the resulting iron, and the individual metal particles sinter to form continuous steel wire cord having an essentially ferritic/pearlitic structure.