Abstract: Method for manufacturing a bone prosthesis made of porous alumina. Calibrated alumina grains are subjected to firing at a temperature lower than their sintering temperature; they are disintegrated, then compressed into a pressed mass, then the latter is subjected to sintering.

Abstract: A rotary liquid metal atomizer is positioned to receive a stream of molten metal on the top thereof. The atomizer is formed as a hollow disc means having a concave top surface and mounted for rotation at high R. P. M.'s on the top of a hollow drive shaft. A circular coolant baffle is located in the hollow disc means, for cooling fluid to flow around, and is mounted on the top of an inlet cooling tube located within the drive shaft. Cooling fluid is directed through the inlet cooling tube to the top of the water baffle where it flows through a hole in the center thereof and around the space between the baffle and the interior of the hollow disc means and down between the inlet cooling tube and drive shaft. The top of the disc means over the coolant baffle is formed of copper. A metal rim is placed around the upper outer periphery of the copper disc forming a recessed center portion. A ceramic coating is placed in the recessed portion with its outer edge against the inside of the rim.

Abstract: An aqueous dispersion of a clay is dewatered and the clay solids thereof are agglomerated using a conditioner and a hydrophobic bridging liquid, and then pellets are formed of the clay agglomerates.

Abstract: The invention disclosed is a multi-layer silver/silver chloride electrode structure for use in electrolytic cells, particularly at low temperatures. Each layer includes an evenly dispersed matrix of metallic silver bonded to silver chloride particles, compressed onto a metal grid. A method for the manufacture of the electrode is also disclosed.

Abstract: A composition comprising .alpha.-alumina in a concentration of at least 99.95 weight percent and process for producing such .alpha.-alumina wherein alumina having an alkali metal content between 0.05 and 0.60 weight percent and Al.sub.2 O.sub.3 content of more than 95 weight percent is electrically fused with silica and additional alkali, if desired, in an electric arc furnace, the heated composition is cooled, comminuted and the so-formed glass phase is removed from an alumina containing phase by mechanical or chemical means.

Abstract: A powder agglomerator and its method of use. The invention is used to take extremely fine flue dust particles in a collection bin and process them before sending the resultant agglomeration to storage or a further processing location. From its collection bin, the dust particles are discharged by gravity upon a lower rapidly rotating smooth horizontal disc. The bin discharge is offset slightly from the disc's center so that the particles are subjected to centrifugal force to move them to the disc's outer periphery. At the point where the particles are discharged on the disc, a liquid binder, like water, is sprayed on the particles to cause them to begin to agglomerate. After being sprayed, the wetted particles are agglomerated under the influence of centrifugal and tangential forces. When they reach the disc's raised edge, the particles are completely agglomerated at which time they fall over the edge into a discharge hopper located below.

Abstract: Six-sided furniture parts are manufactured by pressing a cellulosic fiber-containing mat to consolidate said mat into a unitary blank, cutting the blank to a size larger than interior dimensions of a closed mold in every dimension and with two to four generally shaped or profiled edges disposed between a top surface and a bottom surface of the blank. The cut blank is then molded at a temperature of at least 500.degree. F. for a period of time sufficient to permanently transfer the interior shape and design of the mold cavity to every surface of the blank.

Abstract: A method of molding a cellulosic fiber containing board at a temperature of at least 525.degree. F. to provide a relatively high density skin on at least one surface. A fibrous composition, including cellulosic fibers, is consolidated to form a blank having a density of less than 35 pounds/cubic foot. The blank is then cut to a shape larger in at least two of its three dimensions than corresponding dimensions of a mold cavity when said mold is in a closed position. Urea is then included in at least a surface layer of fibers of the blank in an amount of at least 5% based on the dry weight of the fibers contacted with urea, and thereafter the cut blank is molded to form a contoured product having a skin on at least one surface thereof, the skin defined by a thickness of material on said surface of said product having a density greater than the material on which the skin is formed.

Abstract: A process for manufacture of porous metal objects particularly for making porous metal molds for use in the casting of ceramic objects. A mixture of aluminum powder and vegetable or animal ash is subjected to cold molding, followed by heating it in an oven to the softening temperature of the aluminum powder and subsequently hot molding of said mixture.

Abstract: Pelletized calcium sulfate is prepared from finely divided, natural or synthetic calcium sulfate, wherein the particle size of the finely divided calcium sulfate is at least about 90 per cent by weight less than 200 .mu.m, there being no particles larger than 500 .mu.m, and wherein the finely divided calcium sulfate has a free water content of from about 0.5 to about 4 per cent by weight, by pressing the finely divided calcium sulfate in the presence of water with a roll press using a surface pressure of 1 to 5 Mp per cm roller length.

Abstract: A method for molding a cover on a metal core by preforming cover segments and molding the latter to size with the core interposed therebetween. When molded, the preformed segments are gradually deformed and uniformly compacted to a high density particularly in regions in direct contact with the wall surfaces of the mold, with no inclusion of cracks, pinholes or other structural defects therein. The product molded in this manner exhibits a very high corrosion-resisting characteristic with no machining operation conventionally required thereon, particularly when molded of tetrafluoroethylene resin powder.

Abstract: Sialon, which is one of promising materials in the field of engineering ceramics, is prepared by mixing a silicon nitride precursor such as amino- or imino-silanes and an alumina precursor such as trialkoxy- or triacyloxy-aluminums or polyaluminoxanes to obtain a sialon precursor, and then heating the sialon precursor at a temperature of not lower than 1000.degree. C. either in an ammonium or inert gas atmosphere or under reduced pressures.

Abstract: In a continuous balling process, which may be the formation of green balls from iron ore, water and a binder in a balling drum as a stage in the pelletizing of iron ore, which includes a balling circuit in which undersized balls are recycled directly together with further raw material, the phenomenon known as surging is reduced by a method which involves including in the process a stage modifying the fundamental direct relationship between discharged undersize balls and those recharged, this unmodified direct relationship being the recurrence of the discharged balls identically as recharged balls after a constant time interval.

Abstract: A process for forming green ceramic bodies using an aqueous solution of a high molecular weight, water-soluble polymer as a lubricant.

Abstract: Highly purified metal halide salts are made into a frangible stick having uniformly spaced lines of weakness which permit the stick to be broken readily into cylindrical pellets of uniform size. The pellets are particularly useful to supply the vaporizable fill in high intensity metal halide discharge lamps. The stick is formed by intermittently loading salt powder into the sized entrance to a channel through which the salt is forced, and compressing the charge against the back end of previously formed salt stick by means of a polished plunger.

Abstract: Disclosed is a process for preparing shaped alumina particles for catalysts or catalyst supports by passing droplets of an aqueous slurry of a rehydratable alumina composition through a shaping medium, such as a column of water-immiscible liquid. The alumina composition undergoes rehydration while being shaped as it passes through the shaping medium, and accordingly, firm, discrete alumina bodies are produced.

Abstract: Powder rolling apparatus, for the production of strip equal in width to the roll length, is provided with edge restraint devices in the form of cylindrical blocks mounted in the roll gap region with their axes parallel to the roll axes and rotatably driven to cause an end-face of each restraint block to move in frictional contact with the end-faces of the rolls.

Abstract: An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 0.01 to 5 wt. % alumina.A method for preparing the transparent yttria doped with alumina is also provided comprising admixing alumina or a precursor thereof with yttria or a precursor thereof, drying the admixed powders, calcining the admixed powders and pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for about 1/4 to six hours at a temperature above the eutectic temperature at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.

Abstract: A process for continuously forming a fibrous element in an elongate closed foraminous former during movement of the former through fluid extraction means, and which includes the steps of forming a fibrous dispersion, injecting the dispersion into said former, generating a pressure gradient across an extraction zone within said fluid extraction means and injecting the fibrous dispersion into the former at an injection velocity relative to the speed of the former (efflux ratio) to cause some of the fibres to build up as a fibrous mat on the inner surface of the former and the remainder to pack together to form a core so as to produce a continuous fibrous element having a fibrous core which is enclosed by a crust of greater density.

Abstract: The invention provides a process for making artistic prints on paper, cloth or other sheet material having a three-dimensioned surface texture. A smooth surface plate is first prepared of a waxy composition that is ductile and malleable at ambient temperature, and is also electrically conductive. An artist treats the surface of this plate by engraving and molding to produce a three-dimensional artistic work. An electrically conductive coating is applied to the treated surface and the plate is then coated in an electrolytic bath with a thin film of copper, which constitutes a mold of the artistic work. This copper film is separated from the waxy plate, -tinned, and strengthened by casting onto it a layer of lead. The copper surface of the composite plate is inked or colored with paint, and is then placed on the platen of a printing press having pressure rollers. The sheet material to be printed is placed over the copper surface under a blanket and passed through the press.