摘要:
The present invention relates to a tissue scaffolding agent for the repair and regeneration of bone and soft cell tissue A tissue implant member for implanting in living tissue, comprising a fibrous mat of valve metal filaments in which the filaments have a thickness of less than about (20) microns
摘要:
A process of forming porous electrolytic electrode in which alternating layers of a valve metal and a ductile metal are combined to form a billet, and the billet mechanically reduced by exclusion and drawing prior to etching. One or more slots are formed in the billet prior to the mechanical reducing, and filled with the ductile metal.
摘要:
On obtient un filament supraconducteur de type II, en entourant un noyau de lingot en alliage supraconducteur de type II par des couches d'un alliage supraconducteur de type II à grains fins, une couche barrière de métal réfractaire étant disposée dans une boîte d'extrusion en cuivre (voir figure 1). Le composite ainsi produit est ensuite réduit en un filament par travail à chaud et à froid. Les fils à multifilaments ainsi produits présentent une densité de courant critique supérieure.
摘要:
A superconducting material useful for forming electrolytic devices is made by establishing multiple niobium or tantalum components in a primary billet of a ductile material; working the primary billet through a series of reduction steps to form the niobium or tantalum components into elongated elements; cutting and restacking the resulting elongated elements with a porous confining layer to form a secondary billet, working the secondary billet through a series of reduction steps including twisting and final rolling to thin ribbon cross-sections with greater than 5:1 Aspect Ratios; cutting the resulting elongated billet into sections; and leaching the core and sheath at least in part.
摘要:
A method for producing a superconductor by partial inter diffusion of layers of metal under a diffusion heat treatment to provide a ductile beta phase alloy, along with undiffused metal layers to permit ease of extrusion and drawing to fine layer thickness. At some point in the reduction the layers are further diffused to give an alloy superconducting product which is optimal for the high field (5-9T) of interest in contact with a non-superconducting layer. This optimal diffusion is preferably accomplished after a sufficient reduction such that the individual metal layers are 2.5 - 15 microns thick.
摘要:
A type II superconducting alloy which is superconducting at a predetermined high magnetic field is prepared by creating a composite having a periodic arrangement of at least two transition metals so as to provide numerous interfaces between the different transition metals including niobium, titanium, zirconium, vanadium, hafnium, and tantalum, and alloys thereof. The combination of transition metals is such that one of the metals will serve as a second phase when the layers are subjected to temperatures which would produce a two-phase equilibrium state from a solid solution alloy of the transition metals. The composite is mechanically reduced and heated to cause interdiffusion of the transition metals to form ductile superconducting alloy zones at the interfaces of the transition metals. Sufficient heat treatment is provided in the region where two phases exist in the phase diagram to form two phases, one phase being the desired superconducting Type II alloy and the other phase being the non-superconducting normal metal or alloy. The temperature of heat treatment is limited to the two-phase region. Thereafter, the composite is mechanically reduced so that the two zones are each less than about 1,000 nm in thickness.
摘要:
Provided is an anode for an electrolytic device formed of a substantially uniform mixture of elongated elements with capacitor grade tantalum powders of tantalum metal. Also provided is a method for forming an anode or cathode for an electrolytic device formed of a substantially uniform mixture of elongated elements of a valve metal and a conductive powder metal.
摘要:
A niobium-based superconductor is manufactured by establishing multiple niobium components in a billet of a ductile metal, working the composite billet through a series of reduction steps to form the niobium components into elongated elements, each niobium element having a thickness on the order of 1 to 25 microns, surrounding the billet prior to the last reduction step with a porous confining layer of an acid resistant metal, immersing the confined billet in an acid to remove the ductile metal from between the niobium elements while the niobium elements remain confined by said porous layer, exposing the confined mass of niobium elements to a material capable of reacting with Nb to form a superconductor.
摘要:
A process for forming a porous electrolytic compact by establishing multiple valve metal components in a billet (20) of a ductile metal. The composite billet is worked through a series of diameter reduction steps (22, 24, 30), to form the components into elongated elements, each element having a thickness less than 5 microns. The last diameter reduction step (32) is accomplished with the elements being surrounded by a confining layer of valve metal.