Abstract: The invention relates an agent for treating molten metals, in particular for desulphurizing pig iron melts, containing at least calcium oxide, optionally at least one other element in the elementary and/or bound state, selected from the group including alkali metals, alkaline earth metals or earth metals and bitumes in an amount between 1-30 wt.-% or a mineral oil and/or paraffin oil, in an amount between 1-25 wt. %. Said agent is suitable, in particular, for treating pig iron melts, according to a mono-, co- or multi-injection method, but also for stirring, for example, according to the KR stirring method.

Abstract: The present invention relates to a desulfurizing agent of improved oxidation resistance, ignition resistance and productivity, and a method for manufacturing the desulfurizing agent. The desulfurizing agent may include a plurality of magnesium-aluminum alloy grains with grain boundaries, and a compound of one selected from consisting of magnesium and aluminum and one selected from consisting of alkaline metal and alkaline earth metal, the compound exists in the grain boundaries and is not inside but outside of the magnesium-aluminum alloy grains.

Abstract: The present invention discloses an agent for steel-making formed by aluminum-making slag, which is used by adding to molten steel, wherein said agent comprises: metal aluminum, aluminum oxide, silicon dioxide, magnesium oxide, and calcium oxide. Said agent for steel-making is a deoxidizing agent, modifying agent, and slag regulating agent for steel-making. Said deoxidizing agent or modifying agent for steel-making may comprise by mass percentage 25-70% Al, 3-30% Al2O3, 10-30% CaO, 5-15% MgO, 3˜10% SiO2, and a small amount of impurities. Said slag regulating agent for steel-making may comprise by mass percentage 5-20% Al, 25-70% Al2O3, 10-50% CaO, 5-15% MgO, 3˜10% SiO2, and a small amount of impurities. The agent for steel-making of the present invention facilitates removing sulfur and other impurities from molten steel. In addition, the greatest advantage of this product lies in that it is capable of decreasing total cost of steel-making and improving efficiency of steel-making.

Abstract: Disclosed is a desulfurizing agent of improved oxidation resistance, ignition resistance and productivity, and a method for manufacturing the desulfurizing agent. The desulfurizing agent may include a plurality of magnesium-aluminum alloy grains with grain boundaries, and a compound of one selected from consisting of magnesium and aluminum and one selected from consisting of alkaline metal and alkaline earth metal, the compound existing in the grain boundaries which are not inside but outside of the magnesium-aluminum alloy grains.

Abstract: The present invention relates to a process for the production of ductile iron comprising the sequential steps of:—(i) treating liquid iron with an initialiser comprising an effective amount of a group Ha metal other than Mg, (ii) at a predetermined time after step (i), treating the liquid iron with a magnesium containing nodulariser, (iii) treating the liquid iron with a eutectic graphite nucleation-inducing inoculant, and (iv) casting the iron. The invention allows for the variability of oxygen content in the base iron to be processed such that the mechanical properties of components cast from the processed iron are independent of the original oxygen content of the base iron.

Abstract: A molded body containing titanium, a method for the production thereof, and the use thereof.

Abstract: This invention relates to a novel fire assay flux composition including, inter alia, a dispersant in the form of a source of phosphate; a primary reductant in the form of iron powder comprising particles having a particle size of 60 mesh and finer, at least one basic flux and at least one acidic flux. The fire assay flux composition is useful for the fire assay analysis of Platinum Group Metals and gold in low and medium grade samples such as ores and floatation concentrate including furnace mattes and slags. The invention further extends to the use of such components in the preparation of a fire assay flux composition for fire assay analysis of PGM and gold in low and medium grade samples such as ores and floatation concentrate including furnace mattes and slags.

Abstract: A composition comprising a liquid and a plurality of silver-containing nanoparticles with a stabilizer, wherein the silver-containing nanoparticles are a product of a reaction of a silver compound with a reducing agent comprising a hydrazine compound in the presence of a thermally removable stabilizer in a reaction mixture comprising the silver compound, the reducing agent, the stabilizer, and an organic solvent wherein the hydrazine compound is a hydrocarbyl hydrazine, a hydrocarbyl hydrazine salt, a hydrazide, a carbazate, a sulfonohydrazide, or a mixture thereof and wherein the stabilizer includes an organoamine.

Abstract: The invention relates to a process for producing a metal melt containing at least one base metal and at least one further alloy constituent, wherein the production takes place in a melting vessel with slag covering the melt. In accordance with the invention, for increasing the content of the alloy constituent of the melt, an additive is fed to the melt which contains said alloy constituent at a content of ?5-10 percent by weight of the alloy constituent, ?5-10 percent by weight of melting metallurgically harmless volatile matter, ?5 percent by weight of sulfur and possibly fractions of further alloy constituents and/or slag formers. The additive is obtainable by ore leaching and by precipitation in the form of hydroxides and/or carbonates. The invention also relates to such an additive.

Abstract: An additive for increasing the toughness of thin-wall iron castings is provided. The additive includes amounts of a non-ferrous metal oxide and a metal sulfide in which the non-ferrous metal has an affinity for oxygen less than that of iron, and the metal has an affinity for sulfur less than that of magnesium. The metals contained in the oxides and sulfides are also not alkali, alkali earth or rare earth metals to reduce the incidence of defect formation in the castings. The metal oxide and metal sulfide, when added to a cast iron melt react with magnesium added to the melt as a spheroidizing graphite element to form nucleation sites having a core of magnesium oxide surrounded by magnesium sulfide. These nucleation sites allow for increased nucleation of graphite, whether in vermicular or spheroidal form, such that the cross-section of the thin-wall iron casting is more uniform, thereby decreasing the amount of carbide formed in the casting and increasing the toughness of the casting.

Abstract: A technique for producing iron utilizes agglomerations, such as briquettes or tablets, or powders, that include a sulfur-containing material such as iron sulfide, and and oxygen containing material such as iron oxide. The agglomerations or powders are substantially free of chemical binders and utilize iron and aluminum metal powders and pressure for compaction on either roll presses or tablet machines. Addition of metal powders provides rapid dissolution of the alloy and improved heat transfer. Iron sulfide agglomerations also provide consistent and improved sulfur recoveries compared to granulated iron sulfide additions with little to no sulfur odor.

Abstract: A method of making a powder for covering an ingot mold for the continuous casting of steel, in particular steels with ultra-low carbon content. The powder comprises a base powder and particles of at least one metal nitride, its free carbon content being between 0 and 1% by weight, the method comprising forming a slip of raw materials for the basis powder, at least one metal nitride and water and atomizing the slip to form a mist and drying the mist to form granules having diameters lying between 20 &mgr;m and 800 &mgr;m.

Abstract: A treatment agent and method to introduce magnesium into ferrous material. The treatment agent includes a mixture of high melting temperature particles and magnesium particles. The content of high melting temperature particles in the particle mixture is present in an effective amount to inhibit the complete conversion of the magnesium particles into molten magnesium prior to the magnesium particles entering the ferrous material. The method describes the efficient treatment of molten ferrous material with these particles.

Abstract: The invention provides a new and improved process and exothermic reaction mixture for producing molten weld metal. The molten weld metal is used in joining one metallic piece with at least one other metallic piece. The process and exothermic reaction mixture have distinct advantages over the prior art. These advantages include a higher filler metal yield, an increased tensile strength, and a higher quality corrosion resistant weld. These advantages are accomplished by a process wherein a reactant mixture is provided which has a reducing agent, a metallic compound, and at least two filler metals that at least in part do not chemically react with the metallic compound, one of which is aluminum. The metallic compound subsequently forms, with the reducing agent, having a high heat of formation which provides an exothermic reaction with sufficient heat to melt the filler metals.

Abstract: A new technique for producing ferrosilicon free inoculating agents for gray and ductile irons utilizing oxy-sulfide forming elements combined with sulfur and oxygen and 1) mechanically pressed into an insert or tablet for placement into foundry sand molds or 2) a mixture of the same ingredients used as a loose or granular addition to molten iron. The inoculating agent is composed of 15 to 49% silicon, 7 to 22% calcium, 2.5 to 10% sulfur, 2 to 4% oxygen, 2.5 to 7.5% magnesium and 0.5 to 5% aluminum with the balance iron and incidental impurities, wherein the iron is the primary densification agent.

Abstract: The invention relates to an inoculant for the manufacture of cast iron with lamellar, compacted or spheroidal graphite. The inoculant comprises between 40 and 80% by weight of silicon, between 0.5 and 10% by weight of calcium and/or strontium and/or barium, between 0 and 10% by weight of cerium and/or lanthanum, between 0 and 5% by weight of magnesium, less than 5% by weight of aluminium, between 0 and 10% by weight of manganese and/or titanium and/or zirconium, between 0.5 and 10% by weight of oxygen in the form of one or more metal oxides, the balance being iron, said inoculant further comprising between 0,1 and 10% by weight of sulphur in the form of one or more metal sulphides. The invention further relates to a method for the production of the inoculant.

Abstract: A powder for covering an ingot mold for the continuous casting of steel, in particular steels with ultra-low carbon content. The powder comprises a base powder and particles of at least one metal nitride, its free carbon content (%C.sub.free) being between 0 and 1% by weight, it being produced by atomization, and having the form of granules of between 20 and 800 .mu.m in diameter. In one application of the invention, the nitride is silicon nitride, and its weight content (%Si.sub.3 N.sub.4) is equal to: %Si.sub.3 N.sub.4 =0.5-0.28.times.%C.sub.free .+-.0.10.

Abstract: A method for producing an atomized powder of chromium carbide particles dispersed in a nickel chromium matrix in which chromium in the powder is from 55 to 92 weight percent of the powder.

Abstract: A synthetic gasket material for use in a high-pressure press includes a major proportion of clay mineral powder having sufficient lubricity to flow in a high-pressure press, a minor proportion of at least one hard material powder having a sufficiently greater hardness than the clay mineral to retard flow of the clay mineral and form a seal during pressing in a high-pressure press, and a sufficient amount of binder to form an integral body. The synthetic gasket material is formed by thoroughly mixing together in desired proportions the clay mineral, hard material, and binder. The mixture is compacted into a body near net geometry and having a desired configuration to facilitate use in the high-pressure press. The compacted body is heated for a sufficient time and at a sufficient temperature to remove non-crystallographic water.

Abstract: Solder active braze compositions are disclosed which enable the formation of circuit traces having improved leach resistance during soldering operations so that it is not necessary to apply protective coatings onto the circuit traces. Additionally, the solder active braze compositions disclosed herein can be readily soldered to so that it is not necessary to separately apply a coating onto the circuit trace so that electrical connections can be made to the traces by soldering. Also disclosed are electronic assemblies comprising circuit traces formed from the particular solder active braze compositions, and methods of forming such electronic assemblies.

Abstract: The present invention broadly relates to novel aluminum nitride matrix ceramic composite bodies for use as refractory materials and methods for making the same. The refractory materials are useful in environments which are corrosive, erosive, abrasive and/or which generate thermal shock. Such environments include furnaces, and associated apparatus which house or contact molten masses including, for example, molten metals, molten glasses, etc. The preferred method for making the aluminum nitride matrix ceramic composites comprises a directed oxidation of molten metal.

Abstract: This invention relates generally to a novel method of manufacturing a composite body, such as a ZrB.sub.2 -ZrC-Zr (optional) composite body, by utilizing a post-treatment process and to the novel products made thereby. More particularly, the invention relates to a method of modifying a composite body comprising one or more boron-containing compounds (e.g., a boride or a boride and a carbide) which has been made by the reactive infiltration of a molten parent metal into a bed or mass containing boron carbide, and optionally one or more inert fillers, to form the body.

Abstract: The invention concerns a cored wire comprising a metal tube and a filling of magnesium or other pyrophoric metals passivated with from 0.5 to 5% by weight of organic nitrogen compounds. As the passivating agent, compounds from the series of the s-triazine and/or guanidine derivatives, preferably from 2 to 5% by weight of dicyandiamide, applied by means of an adhesion promoter, are preferred. The wires used in accordance with the invention serve to produce cast iron with spheroidal and vermicular graphite, to desulphurize pig iron melts or to produce metal alloys.

Abstract: The present invention provides a process for the passivation of pyrophoric metals and especially of magnesium by coating with a passivation agent, wherein, as passivation agent, there is used 0.5 to 5% by weight of an s-triazine derivative and/or a guanidine, referred to the weight of the metal.The present invention also provides a passivated pyrophoric metal, wherein the metal particles are coated with 0.5 to 5% by weight of an s-triazine derivative and/or guanidine or a guanidine derivative, referred to the weight of the metal.