416 results about "Forsterite" patented technology

The invention relates to an alkaline composite refractory brick, which consists of a periclase-magnesium aluminate spinel flame retardant coating and a periclase-forsterite thermal-protective coating. The proportion of the alkaline composite refractory brick is as follows: 1) the proportion of the flame retardant coating is as follows: 29 to 48 percent of magnesite of between 5 and 1 millimeter, 7 to 16 percent of the magnesium aluminate spinel of between 3 and 1 millimeter, 6 to 20 percent of the magnesite of between 1 and 0.088 millimeter, 0 to 4 percent of desilicated zirconia granules of between 0.4 and 0.088 millimeter, 16 to 25 percent of the magnesite of less than 0.088 millimeter, 0 to 10 percent of magnesite micropowder of less than 0.020 millimeter, 0 to 5 percent of desilicated zirconia micropowder of less than 0.020 millimeter, 0 to 3 percent of calcium carbonate micropowder less than 0.020 millimeter, 0 to 6 percent of lanthanum oxide of less than 0.020 millimeter, and 0 to 0.3 percent of additional water reducing agent (sulfonated naphthaldehyde polymer, sulfonated melamine polymer and polycarboxylic acid or sodium salt thereof); and 2) the proportion of the thermal-protective coating is as follows: 0 to 20 percent of the magnesite of between 3.2 and 1.0 millimeter, 35 to 45 percent of the forsterite of between 3.2 and 1.0 meter, 5 to 15 percent of the magnesite of between 1.0 and 0.088 millimeter, 5 to 15 percent of the forsterite of between 1.0 and 0.088 millimeter, and 30 to 40 percent of grinding powder of the magnesite and the forsterite of less than 0.088 millimeter. The material has the advantages that the material improves the erosion resistance of the flame retardant coating by micropowder technology, and allows the sintering temperature of the flame retardant coating to be matched with that of the thermal-protective coating, thereby producing the periclase-magnesium aluminate spinel alkaline composite refractory brick which has excellent.

A glass ceramic composition is provided which can be fired at a temperature of 1,000° C. or less to form a sintered body having a low relative dielectric constant, a small temperature coefficient of resonant frequency, a small change in capacitance before and after a loading test, a high Qf value, high electrical insulating reliability, and a high flexural strength. A glass ceramic composition forming glass ceramic layers laminated to each other in a multilayer ceramic substrate is also provided. The glass ceramic composition includes a first ceramic powder containing forsterite as a primary component; a second ceramic powder containing SrTiO₃ and/or TiO₂ as a primary component; a third ceramic powder containing BaZrO₃ as a primary component; a fourth ceramic powder containing SrZrO₃ as a primary component; and a borosilicate glass which contains Li₂O, MgO, B₂O₃, SiO₂, and ZnO, and also which contains at least one of CaO, BaO, and SrO.

The invention relates to a magnesium-alloy metal-type casting coating and a preparation method thereof. Magnesia and forsterite are used as refractory aggregates; titania, asbestos powder or talcum powder or diatomite, and the like are added as heat-insulation aggregates; a mixed caking agent with favorable high-temperature caking property and a compound suspending agent are selected; and boric acid is added as a flame retardant. The preparation method comprises the following steps: mixing the magnesia, the forsterite, the titania, and the asbestos powder or talcum powder or diatomite, and preparing A after ball milling; mixing the caking agent and bentonite, and adding water to activate so as to obtain B; mixing the boric acid, sodium carboxymethyl cellulose and polyacrylamide, and addingwater to activate so as to obtain C; and finally, mixing A, B and C, and carrying out ball milling or colloid milling for more than 30 minutes to obtain the magnesium-alloy metal-type casting coating. The coating has the advantages of favorable heat insulation, caking property, coating property, flame retardance, stability and durability, is beneficial to continuous production and convenient forobtaining magnesium-alloy metal-type castings with favorable surface quality and superior performance, and prolongs the service life of moulds.

The invention relates to a forsterite-C-containing MgO-SiC-C material refractory and a method for preparing the same. The technical scheme comprises firstly mixing the 25-40wt% of magnesia particles with a grain size of 3-1mm, 20-35wt% of magnesia particles with a grain size of 1-0mm, 5-40wt% of forsterite-C mixed fine powders and 0-35wt% of magnesia fine powders, adding a 4-10wt% of bonding agent accounting for the weight of the mixed material, stirring or mulling for 10-30 minutes, drying after pressing formation, sintering at a reductive atmosphere with a sintering temperature of 1450-1700 DEG C and a heat preservation time of 4-8 hours, getting the MgO-SiC-C material composite refractory. The MgO-SiC-C material refractory prepared by adding the forsterite and carbon not only can solve the problem of magnesia resource shortage, reduces the production cost, but also the SiC prepared by the reaction of magnesia and carbon at a high temperature can reinforce the conjugation inside the material, and be useful for improving the refractory performance. The invention can also adopt low grade magnesia.

The invention discloses a pouring material for a forsterite tundish slag stop wall and a production process thereof. The pouring material is prepared from the following raw materials in part by weight: 5 to 70 parts of forsterite, 15 to 85 parts of magnesium sand, 5 to 15 parts of corundum powder, 3 to 5 parts of composite additive, 0.1 part of organic fiber and 1 part of steel fiber. The production process comprises the following steps of: adding aggregates in the raw materials into a stirrer and mixing and stirring the aggregates uniformly, then adding the fine powder and the composite additive into the mixed aggregates and stirring the mixture for 2 to 3 minutes, adding water into the mixture and stirring the mixture for 2 to 3 minutes when all the materials are mixed and stirred uniformly, and performing discharge, vibration molding, curing, drying and packing. The formula cost of the product is reduced by adopting combined action of the forsterite and the magnesium sand; and the construction performance and the use performance of the product are ensured at the same time of improving the strength of the product by adopting the composite additive, organic fiber, steel fiber andthe like with good performance.

An insulating ceramic composition forming insulating ceramic layers (3) stacked in a multilayer ceramic substrate (2) used in a monolithic ceramic electronic component, such as a multilayer ceramic module (1). The insulating ceramic composition contains a first ceramic powder mainly containing forsterite, a second ceramic powder mainly containing at least one compound selected from the group consisting of CaTiO₃, SrTiO₃, and TiO₂, and a borosilicate glass powder. The borosilicate glass powder contains 3 to 15 percent by weight of lithium in terms of Li₂O, 30 to 50 percent by weight of magnesium in terms of MgO, 15 to 30 percent by weight of boron in terms of B₂O₃, 10 to 35 percent by weight of silicon in terms of SiO₂, 6 to 20 percent by weight of zinc in terms of ZnO, and 0 to 15 percent by weight of aluminum in terms of Al₂O₃. The insulating ceramic composition can be fired at a temperature of 1000° C. or less, and the resulting sintered compact has a low relative dielectric constant, a resonance frequency with a low temperature coefficient, and a high Q value.

The invention discloses a method for synthesizing high-purity forsterite by using magnesite tailings and talc tailings, which effectively utilizes tailings resources and can be used to produce high-density refractory materials used under high-temperature conditions above 1600°C. The present invention uses magnesite tailings and talc tailings as the main raw materials, adds additives and binders, and manufactures high-purity forsterite refractory raw materials through batching, mixing, molding, drying, high-temperature synthesis and crushing. The weight percent content of each component is as follows: 60-70% of fine magnesite tailings powder; 25-35% of talc tailings powder; 2-8% of additives; 5-10% of external binder. Using magnesite tailings and talc tailings to synthesize high-purity forsterite refractory raw materials, the use temperature is high (above 1600 ℃), the bulk density is high (greater than 2.55g/cm3), and the combined content of olivine and periclase is greater than 97%. The utility model has wide application field, comprehensive utilization of waste, and low production cost.

Grain-oriented electrical steel sheet excellent in coating adhesion is provided. The steel sheet contains Si: 2 to 7% mass % and has a primary coating composed mainly of forsterite on its surface. A compound (A) containing one or more elements selected from among Ca, Sr and Ba, at least one rare earth metal, and sulfur is incorporated in the primary coating so as to reside in the interface layer between the primary coating and the steel sheet. As a result, occurrence of primary coating exfoliation at regions that are strongly worked during manufacture of a wound core transformer or the like is prevented.

The light color alcohol-base paint is compounded with zirconite powder 15-25 wt%, brown alumina powder 20-35 wt%, mullite powder 5-15 wt%, flaky graphite powder10-25 wt%, forsterite powder 5-10 wt%, binder 2-4 wt%, suspending agent 15-25 wt%, assistant 0.01- 0.2 wt% and solvent 15-30 wt%. The light color alcohol-base paint has less pollution, low cost, capacity of preventing crack in sand model and capacity of avoiding molten iron permeation and sand fusion to raise casting quality.

The present invention can provide a directional magnetic steel plate capable of further reducing iron loss of a material with a groove formed thereon for dividing a magnetic domain and capable of obtaining excellent low-iron-loss characteristics when incorporated into an actual transformer. This directional magnetic steel plate is obtained under the following conditions: the thickness of a forsterite coating at the bottom of a groove formed on the surface of the steel plate is 0.3 [mu]m or more; the groove frequency which is the abundance ratio of grooves having, immediately thereunder, crystal grains with an orientation 10 DEG or more different from the Goss orientation and a grain size of 5 [mu]m or more is 20% or less; the total tension to be applied to the steel plate by the forsterite coating and a tension coating is 10.0 MPa or more in the rolling direction and 5.0 MPa or more in the direction perpendicular to the rolling direction; and these total tensions satisfy the relationship of formula, 1.0 = A/B = 5.0 where A is the total tension applied in the rolling direction by the forsterite coating and the tension coating, and B is the total tension applied in the direction perpendicular to the rolling direction by the forsterite coating and the tension coating.

The invention relates to MgO-SiC-C refractory material synthesized by forsterite-C and a method. The technical proposal to be adopted is as follows: firstly, forsterite mineral powder and industrial carbon powder are blended according to molar ratio of 1: (1-5); and then the mixture is added with 4 to 10 wt% of bonding agent, stirred or mulled for 10 to 30 minutes, pressed to be formed and dried; and finally under the Ar gas condition, the mixture is sintered in the sintering temperature of 1530 to 1800 DEG C with heat preservation for 2 to 8 hours to obtain MgO-SiC-C refractory material synthesized by forsterite-C. The invention is characterized by comparatively simple processing technique, low producing cost, high producing efficiency, wide raw material source and being capable of reducing energy consumption of high temperature synthesis reaction. The prepared MgO-SiC-C refractory material has the advantages of excellent high temperature performance, anti-corrosion and good durability.

The invention provides an environmentally-friendly tundish dry material, which can solve the problems that a large number of harmful irritant gases generated by solid phenolic resin pollute the environment and are unfavorable for clean steelmaking and environmental friendliness and the like in the prior art. The tundish dry material comprises the following components in percentage by weight: 87 to 96 percent of at least one of magnesite and forsterite, 1 to 5 percent of rosin, 1 to 5 percent of hydrosilicate, 0 to 2 percent of alumina fine powder, 0 to 1 percent of boron glass, 0 to 1 percentof silica micropowder and 0 to 0.5 percent of phosphate. The rosin and the hydrosilicate serve as compound binders, and advantages of the two binders are combined, so that the baking demolding strength of the dry material can be equivalent to that of a resin-bonded dry material and a large number of eutectics which influence the high temperature property of the dry material cannot be introduced simultaneously; therefore, the dry material has the characteristics of environmental friendliness and long service life.

The present invention relates to a refractory coating for forsterite tundish and the preparation method thereof. The technical scheme adopted is that: 20-50 wt percent of forsterite sand, 25-55 wt percent of forsterite clinker, 15-30 wt percent of magnesia powder, 5-15 wt percent of magnesia-calcium sand powder are mixed with 1-5 wt percent of clay, which are coupled with 0-0.5 wt percent of organic fiber of the above ingredients, 0.5-2.0 wt percent of sodium hexametaphosphate and 0.3-1.0 wt percent of sodium tripolyphosphate, and then the present invention is prepared through the mixing of a mixer; when the present invention is in use, the present invention is added with water and stirred. The present invention takes forsterite as base material, and the products prepared is characterized in good high-temperature resistance, low cost, no pollution to molten steel, good durability, no adverse effect to human body and convenient use.

The invention discloses a gunning mix for a converter, which comprises the following components in percentage by weight: 40 to 60 percent of forsterite of which the particle size is between 0.1 and 5 millimeters, 10 to 30 percent of dolomite of which the particle size is between 0.1 and 3 millimeters, 10 to 20 percent of sintered mid-range magnesia of which the particle size is between 0.01 and 0.088 millimeter, 0.5 to 5 percent of burning and coagulation accelerator, and 1 to 5 percent of bonding agent. When applied to the converter, the forsterite gunning mix prepared by adopting the formulation has the advantages of high adhesive rate, good spalling resistance, quick sintering, erosion resistance, scouring resistance and small high temperature expansion, and simultaneously is insusceptible to gun blockage during the construction. Besides, gunning mix has abundant available mineral products with low price so as to play a role of saving important energy resources, has no influence on the quality of molten steel in use, and is free from causing pollution to the environment.

Provided is a grain-oriented electrical steel sheet having a linear groove forming an angle of 45° or less with the direction perpendicular to the direction of rolling, wherein a grain-oriented electrical steel sheet having low iron loss characteristics, on which a magnetic domain subdivision treatment by chemical means is used, is provided by setting the incidence of microparticles having a length of 1 mm or less in the rolling direction in a bottom part of the groove to 10% or less (also including cases in which microparticles are not present), providing a forsterite coating in which the Mg weight per side of the steel sheet is at least 0.6 g/m2 in the groove, and setting the angle (beta angle) between a rolling surface and the <100> axis of a secondary recrystallized grain oriented in the rolling direction of the steel sheet to an average value of 3° or less.

The present invention provides a grain-oriented silicon steel sheet excellent in adhesiveness to tension-creating insulating coating films formed on the grain-oriented silicon steel sheet produced by removing inorganic mineral films composed of forsterite and so on with pickling or the like or by deliberately preventing the formation thereof, characterized by: having, at the interface between each of the tension-creating insulating coating films and the steel sheet, an external oxidation type membranous oxide film of 2 to 500 nm in average thickness mainly composed of amorphous silica and/or a mixed oxide film consisting of an external oxidation type membranous oxide film of 2 to 500 nm in average thickness mainly composed of amorphous silica and particulate oxides mainly composed of amorphous silica: and satisfying any one or more of the specified requirements.

A high-temp. alkali-resistant material mainly contains MgO, SiO2 and Al2O3. Its primary crystal phase is forsterite and spinel. Its features are high resistance to alkali corrosion at high temp and use for preparing ceramic filler of heat-accumulating thermal oxidizer to treat organic waste gas in wood industry.

The invention relates to a cordierite porous fireproofing material and a preparation method thereof, belonging to the technical field of fireproofing materials. The invention is characterized in that coal ash and natural raw mineral material magneiste or tailing thereof are main raw materials, and the cordierite porous fireproofing material is prepared by burdening, mixing, forming, drying, sintering and other technical processes. In the raw material proportion of the invention, the addictive amount of the coal ash is 2.0%-99.0% by weight and the addictive amount of the magneiste is 1.0-96.0% by weight; and in addition, the addictive amount of pore-forming agent is 0.0%-20.0% by weight and the addictive amount of binding agent is 0.1%-10.0% by weight. A main phase of the porous fireproofing material prepared at high temperature is cordierite and forsterite, which has the characteristics of high porosity, small volume density, high strength, good heat insulation, low cost and the like. The invention provides a brand new technical way for high-efficiency value-added utility of solid waste materials and gioberite such as the coal ash.

The invention discloses a work layer coating of a steel casting tundish, which comprises the following raw materials in weight parts by proportion: 64 parts of forsterite, 31.5 parts of sintered magnesite, 2.5 parts of silicon micro-powder, 1 part of paper fiber, 0.5 part of sodium tripolyphosphate, 0.3 part of canary dextrin, 0.2 part of white mud, 0.01 part of anti-explosion fiber, 0.0013 part of sodium dodecyl sulfate and 0.001 part of aluminum powder. The work layer coating of the steel casting tundish, obtained in the invention, has enhanced folding and compressive strength and good high-temperature usability, and when applied to the tundish, the invention can achieve the effects of good smearing property, no phenomena of back-falling, flowing, bubbling, no phenomena of bursting and peeling during roasting, good corrosion resistance to alkali covering agent, strong molten steel flushing resistance, no deterioration of wrapping wall, and no pollution to the molten steel, thereby effectively meeting the working requirements on the rtundish and prolonging the service life.