Abstract: A molten metal pump includes a filter that prevents ingestion of foreign material such as dross from molten metal within which the pump is immersed. The filter is a large structure that is secured to the base of the pump surrounding the pump's inlet. The filter forms a cavity adjacent the pump's inlet. The ratio of the surface area of the filter to the inlet area of the pump is very large due in part to a corrugated end wall included as part of the filter. The filter has a low porosity while maintaining a high flow rate for the pump.

Abstract: The subject invention relates to a hybrid reinforcement material comprising a refractory metal core having a first coating comprising aluminum, oxygen and nitrogen, this coating of the general formula:Al.sub.x O.sub.y N.sub.zwhereinx is up to about 670 atomic % of the coatingy is from about 20 atomic % to about 55 atomic % ofthe coating; andz is from about 5 atomic % to about 45 atomic % of the coating, with the proviso that x+y+z=100, and having a second SiC coating.The subject invention further relates to a high strength, high temperature performance composite containing the hybrid reinforcement specified above.

Abstract: A process for depositing a ceramic coating on a filament, which comprises heating the filament by passage of an electric current via at least two electrodes, and passing the heated filament through a deposition chamber containing gases which on contact with the hot filament deposit the required coating; characterized in that after deposition of the coating, the coated filament passes through an electrode containing a liquid metal mixture which is a mercury/indium or mercury/cadmium amalgam or a gallium/indium mixture.

Abstract: A fire barrier material for use in building construction comprising a sandwich structure have a first and second outer layers comprising a high temperature resistant material having corrugations therein and an intermediate layer comprising a flame retardant fibrous material wherein the corrugation are positioned in the outer layers in a manner which enables the barrier material to be rolled into a bundle in a direction substantially perpendicular to the direction of the corrugations.

Abstract: A process for producing a sintered AlN ceramic body by mixing an organic solution comprising a hydrocarbon solvent and an organometallic compound with AlN powder to produce a slurry, removing the solvent from the slurry to form a mixture of organometallic compound and AlN, forming the mixture into a shape, and heating the shape in a non-oxidizing atmosphere to sintering temperature to obtain densification.

Abstract: A catalyst which comprises zinc, together with an effective amount of a platinum group metal on a support which is a material having the silicalite structure, the framework of said material consisting essentially of silicon and oxygen atoms or of silicon, zinc and oxygen atoms. There is also provided a process for the dehydrogenation of a C.sub.2 to C.sub.10 paraffin to yield an alkene product which process comprises contacting the paraffin under dehydrogenation conditions with a catalyst according to the invention.

Abstract: Crystalline silicon carbide wherein at least 90 weight percent of the silicon carbide is formed from a plurality of hexagonal crystal lattices wherein at least 80 weight percent of the crystals formed from the lattices contain at least a portion of opposing parallel base faces separated by a distance of from 0.5 to 20 microns. The crystals may be in the form of separate particles, e.g. separate platelets, or may comprise an intergrown structure. The crystalline silicon carbide of the invention is produced by heating a porous alpha silicon carbide precursor composition comprising silicon and carbon in intimate contact to a temperature of from 2100.degree. C. to 2500.degree. C. in a non-reactive atmosphere. The materials are high performance materials finding use in reinforcing, high temperature thermal insulating, improvement of thermal shock resistance, and modification of electrical properties.

Abstract: A method for preparing silazane polymers is disclosed which comprises reacting under transamination conditions:(A) one or more silicon amides represented by the general formula:((R.sup.1).sub.2 N).sub.a -Si(R).sub.bwherein each R is independently hydrogen or a hydrocarbon group, a is an integer from two to four, b is an integer from zero to two and the sum of a and b equals four; with(B) one or more polymers.Also, disclosed are the silazane polymers produced by this method and silicon ceramics produced from these polysilazanes.

Abstract: The invention relates to novel suppressants for unsaturated polyester styrenated resins resulting in lower emission of volatile compounds in the production of the polyester resins.

Abstract: Disclosed is a process for the partial oxidation of propane to yield acrylic acid, propylene, acrolein and acetic acid by contacting propane in admixture with a molecular oxygen-containing gas in a reaction zone with an oxidic solid catalyst that1) contains the components and proportions represented by the empirical formulaBi.sub.b Mo.sub.c V.sub.v A.sub.a D.sub.d E.sub.e O.sub.xwhereinA is one or more of K, Na, Li, Cs and Tl,D is one or more of Fe, Ni, Co, Zn, Ce and La,E is one or more of W, Nb, Sb, Sn, P, Cu, Pb, B, Mg, Ca and Sr,a, d and e are each zero-10b is 0.1-10c is 0.1-20v is 0.1-10c:b is from 2:1 to 30:1v:b is from 1.5:1 to 8:1and2) is made by performing a bismuth molybdate containing composition having at least 0.67 atoms of Mo per atom of Bi, before combining with any vanadium compound.

Abstract: A process is disclosed which limits the corrosion of the materials of construction of a wet oxidation system treating wastewaters. The process is particularly useful in the wet oxidation treatment of ammonium sulfate containing wastes such as acrylonitrile wastewaters. The wastewater is mixed with an oxygen containing gas such that a substantial residual oxygen gas concentration is maintained from before the stream-gas mixture is heated for wet oxidation until after the oxidized stream-gas mixture is cooled and separated. Preferably, in the treatment of acrylonitrile waste water the shutdown procedure comprises cooling said waste stream by introducing an aqueous liquid substantially free of organic impurities and containing a basic material.

Abstract: A process for forming a transparent silicon carbide film on substrates by magnetron sputtering a silicon carbide target in a partial vacuum having a partial pressure of hydrogen and argon.

Abstract: This invention provides for a process for separating extractable organic material from a feed composition comprising an oil-in-water emulsion comprising a continuous aqueous phase, a discontinuous organic liquid phase comprising said extractable organic material, and solids dispersed in said emulsion, the process comprising the steps of:(I) mixing said feed composition with sufficient shear to convert said feed composition to a water-in-oil emulsion; and(II) contacting said water-in-oil emulsion with at least one organic solvent, said organic solvent being capable of forming with said emulsion a system comprising at least two phases and being capable of dissolving at least about ten parts of said extractable organic material per million parts of said organic solvent at the temperature wherein at least about 50% by weight of said solvent boils at atmospheric pressure; forming a system comprising at least two phases, one of said phases being an emulsion phase comprising said emulsion and the other of said phase

Abstract: A molten metal pump includes an impeller disposed at the end of an elongate drive shaft. The drive shaft is disposed within an elongate, hollow post. The impeller and the end of the post are adapted to be immersed in molten metal. An inert gas is conveyed through the gap between the outer surface of the drive shaft and the inner surface of the post, which gas is discharged into the molten metal in the vicinity of the impeller. Because the drive shaft is insulated from the molten metal, it can be made of a durable material such as steel; because the post is stationary relative to the molten metal, the metal is stirred only by the impeller, and not by the drive shaft. The invention includes other features such as a quick disconnect capability and a radial adjustment capability.

Abstract: A porous ceramic body of high structural strength and integrity is disclosed, along with the method of fabricating such, whereby a curable resin and a sinterable ceramic are mixed and then admixed to removable pore formers, then consolidated into a green body, the pore formers removed, and sintered into the porous ceramic body.

Abstract: A method for the treatment of fluid feedstreams comprises the steps of providing at least one wafer (200) comprising a central area (202) providing a plurality of members (18) arranged in a plurality of layers (201) and peripheral support means (203) encompassing the central area, arranged axially in a module (180) having first and second ports (185, 208); a plurality of separate bore fluid chambers (198, 199) generally encompassing the peripheral support means and communicable with the members within the central area, and a plurality of separate bore fluid ports (192, 193) communicable with the bore fluid chambers; directing the feedstream through the first port and over the wafer; and transferring materials between the central area in the wafer and the feedstream. Related methods employ other multi port apparatus (220, 240) as well as wafers (240, 280, 300, 320, 350, 410, 460) for use therein.

Abstract: A process for producing a dialkyl ester (i.e. BTDE) from its corresponding dianhydride (i.e., BTDA) comprising mixing the dianhydride, an organic solvent, solid catalyst and an alcohol capable of reacting with the dianhydride stirring the solution until the dianhydride and alcohol have reacted to form the dialkyl ester, separating the dialkyl ester from the catalyst and drying the ester to form a solid paticulate product. The product has a purity of over 85%.

Abstract: A method of producing near net shape fusion cast refractories. The method includes the steps of continuously introducing refractory particles into a melting furnace, rapidly heating the particles, depositing the heated particles into a melt pool, continuously introducing the molten material into a mold, and continuously withdrawing a solidified body from the mold as the molten material continually solidifies. The above stated method produces a fusion cast refractory having a generally random, fine, uniform microstructure; uniform chemistry; and generally evenly distributed closed pores.

Abstract: A method for determining the height and length of a fracture (3) in a borehole (1) involves generating pressure waves in the fluid in the wellbore using a valve (4) and measuring the response at the well-head by means of a transducer (5). A theoretical model of the wellbore-fracture system is generated and compared with the measured response to determine the height and length of the fracture.

Abstract: A process for adhering high nitrile resins onto a plastic material. The process comprises the steps of selecting a high nitrile resin having a nitrile content of at least about 60 percent by weight and prepared by the copolymerization of an olefinically unsaturated monovinyl nitrile and a monovinyl monomer copolymerizable therewith in the presence of a conjugated diene rubber, preparing a solution comprising from about one to 70 percent by weight of the high nitrile resin in a photopolymerizable solvent comprising from about 30 to 99 percent by weight of the solution and from about 0.