77results about How to "Improve sintering strength" patented technology

The invention relates to a heating furnace mending material and a preparation method thereof in the field of refractory materials. The heating furnace mending material is prepared by uniformly mixing 2 to 20 weight percent of sodium silicate and/or sodium metasilicate serving as a bonding agent, 97 to 80 weight percent of corundum, bauxite or mullite serving as a main raw material, and 0.5 to 8 weight percent of silica micropowder, alumina micropowder or bauxite micropowder serving as a sintering aid. The mending material has the advantages that: 1, the addition of water is avoided, namely, the mending material can be used for dry mending, so the influence of factors, such as maintenance, baking and the like, on the performance of the mending material is avoided; 2, the mending is simple and convenient to construct without stopping a furnace, namely, the mending material can be spread for furnace mending at normal temperature and thrown for the furnace mending at high temperature; 3, the mending material does not produce any harmful gas in the mending so as to meet the requirement of environmental protection; 4, the mending material has a wide curing and sintering temperature range, and can be quickly cured and sintered at 150 to 1,200 DEG C; 5, the mending material has relatively higher cohesiveness with an original furnace lining material, and does not produce layering after the mending; and 6, the mending material has slag resistance, abrasive resistance and high thermal shock resistance, and the furnace has long service life after being mended.

The invention relates to an anhydrous stemming for a large and medium sized blast furnace and a preparation method of the anhydrous stemming. The stemming comprises the raw materials of bauxites aggregate and fine powder, silicon carbide aggregate and fine powder, coke, plastic clay powder, asphalt powder and a micro powder additive, the micro powder additive comprises metallic silicon powder, metallic aluminum powder, high-carbon resin powder, alumina micro powder, silica fume, sodium carboxymethyl cellulose and sodium hexametaphosphate in parts by weight, and tar is taken as a binding agent in the producing and stirring processes. The anhydrous stemming realizes high-temperature rapid sintering of the stemming, the binding degree of new and old stemming is strengthened, the capability of resisting scouring of an iron slag of a mud drum of an iron notch is improved, the porosity of the stemming material is low, the compactness of the stemming material is good, the property of resisting corrosion and permeation of an iron slag liquid of the stemming is strengthened, the stemming is favorable for keeping the depth of the iron notch and the stability of the pore size of the iron notch, and can well adapt to the performance requirement of enlargement of the blast furnace on the stemming of the iron notch.

A sintered metallic bearing obtained by compacting raw-material powders comprising Cu powders, SUS powders, and pure-Fe powders and thereafter sintering the compact at a given temperature.

The invention relates to the technical field of unshaped refractory materials in converter steelmaking and particularly relates to a converter repairing mass and a preparation method thereof. The converter repairing mass is prepared from the following raw materials in parts by weight: 70-110 parts of mixture of fused magnesite and waste magnesia carbon brick particles, 10-30 parts of fused magnesite fine powder, 5-8 parts of bonding agent and 2-5 parts of filler, wherein the mixture of fused magnesite and waste magnesia carbon brick particles at least comprises 10-30 parts of fused magnesite fine powder. The preparation method of the converter repairing mass comprises the following steps of: adding 0.5-1.5 weight parts of wetting agent into the raw materials of the converter repairing mass, and mixing and stirring to obtain loose, dry and uniform aggregate. According to the converter repairing mass and preparation method thereof, the waste magnesia carbon brick serves as a raw material, and the converter lining built by the magnesia carbon bricks realizes a better protection effect; the converter repairing mass has the advantages of good high-temperature fluidity, short sintering time, high sintering strength, long service life, environmental protection and the like.

The invention relates to a replacing method of a converter tap hole and belongs to the technical field of steel smelting. The replacing method of the converter tap hole provided by the invention comprises the following steps: 1, placing a whole set of brick in a brick cup channel and adjusting the angle and position; and 2, fixing the whole set of brick on the converter body, filling the gap between the brick cup and whole set of brick with a tapping hole grouting material and sintering the tapping hole grouting material by the waste heat in the converter. The invention has the following beneficial effects of the replace time shortened by about 10 minutes compared with an existing method, the service life of the tapping hole prolonged by about 250 furnace compared with the existing method, the success rate for pushing off the slag improved by 10% compared with the existing method and the cost on per ton of steel reduced by about 0.15 yuan, so as to achieve the purposes of shortening replace time for converter tapping hole, prolonging the service life of tapping hole, improving slag pushing-off rate, reducing production mistake, improving product quality and reducing production cost.

The invention provides silicon carbide ceramic and a preparation method thereof. The preparation method includes: subjecting a ceramic main raw material, a binder accounting for 2.5-3% of weight of the ceramic main raw material and a dispersant accounting for 1.5-2.5% of the weight of the ceramic main raw material to cold isostatic pressing and liquid phase sintering. Generally, dry pressing is adopted for forming a ceramic material; during dry pressing, various performances of a material are influenced by nonuniform density distribution inside a blank caused by nonuniform pressure distribution; compared with dry pressing, cold isostatic pressing is uniform in pressurizing, pressures received by the material in all directions are identical, and sintering density, bending strength and rupture strength of the material are improved.

The invention provides an electrolytic aluminum prebaked anode anti-oxidation insulating coating. The electrolytic aluminum prebaked anode anti-oxidation insulating coating comprises the following components in percentage by mass: 60%-75% of a main component, 0.01%-5% of a secondary component, 24%-34% of a nano solvent binding phase and 0.01%-5% of a coating stabilizing phase, wherein the main component comprises amorphous aluminum oxide, nano-scale rho-Al2O3, nano-scale gamma-Al2O3 and nano-scale alpha-Al2O3. The insulating coating prepared by the invention can be cured at normal temperaturefor 6-8 hours after being sprayed to an anode by a spraying machine, the anode coating can form a compact net-shaped structure at the working temperature of 500-800 DEG C, the long-term tolerable temperature is over 900 DEG C, and the physical and chemical properties are stable.

The invention relates to a sintering additive and a preparation method and application method thereof. The sintering additive comprises, by weight, 30-80 parts of magnesite, 0-30 parts of light-burned magnesia, 6-12 parts of lizardite, 4-8 parts of dolomite, 1-2 parts of magnesium sulfate, 1-2.5 parts of boron and 0.5-1.5 parts of organic binding agents. The magnesite, the light-burned magnesia, the lizardite, the dolomite, the magnesium sulfate, the boron and the organic binding agents are put into a mixer to be mixed and crushed and ground in a crushing machine until the granularity is below 200 meshes. The mixture is dried and bagged. The sintering additive has the advantages that the melting temperature of the mixture is reduced, the ignition conditions are improved, the return mine quantity is reduced, and the rate of finished products is increased; the heat transfer conditions of gas-solid-liquid phases in the sintering process are improved, so that the sintering speed is increased, the sintering time is shortened, and the production efficiency is improved; the sintering additive can have a catalytic effect on gasification combustion of solid fuel, enhance the reactivity of the fuel, enable the temperature of a combustion zone in the sintering process to be increased, facilitate mineralization reactions and generate more liquid phases.

The invention discloses a slag anti-adhesion coating for a hot metal ladle. The slag anti-adhesion coating consists of the following components in percentages by weight: 35-70wt% of carbonaceous fireproof waste brick A-level materials, 10-35wt% of waste high-aluminum brick materials, 5-30wt% of black silicon carbide, 3-8wt% of aluminous cement, 3-8wt% of Guangxi white clay, 0.1-2wt% of carboxymethyl cellulose sodium, 0.1-1wt% of sodium tripolyphosphate, 0.1-1wt% of organic explosion-proof fibers, and 0.01-1wt% of quick lime. According to the slag anti-adhesion coating for the hot metal ladle disclosed by the invention, the preparation process is simple; besides, in the construction project of slag anti-adhesion treatment for the hot metal ladle, the slag anti-adhesion coating has the characteristics of being simple in construction, excellent in slag anti-adhesion property, high in sintering intensity, low in cost and the like, and is obvious in economic benefit and social benefit.

The invention discloses a method for producing premixed copper-tin 10 bronze. The method comprises the steps that copper powder is subjected to water atomization by a conical spray tray and then is subjected to thermal treatment, the copper powder subjected to thermal treatment is crushed and subjected to oxidation resistance, and raw material copper powder is obtained through screening; the prepared copper powder and tin powder are evenly mixed according to the mass fraction; the powder is subjected to thermal treatment in a reducing atmosphere, and copper powder particles and tin powder particles are bonded with each other in a diffusion mode in the thermal treatment process; the thermal treatment powder is crushed, and powder is obtained through screening; a lubricating agent is added into the powder to be mixed evenly. According to mixed bronze powder produced by the method, the water atomization copper powder in irregular shapes is used and then is subjected to thermal treatment, so that the raw material copper powder has good toughness, and composition segregation of the bronze powder is avoided; in addition, the water atomization copper powder is likely to form communicated pores after being sintered, and the environment can not be polluted by the water atomization method for producing the bronze powder. The premixed bronze prepared by the method is free of composition segregation, stable in apparent density, good in forming property and high in sintered strength; well distributed pores are formed in a sintered mode.

The invention belongs to the technical field of adsorbing materials, and particularly relates to a concentrated rotating wheel adsorbing material and a preparation method of the adsorbing material. The adsorbing material comprises a base material, a high-silicon type zeolite molecular sieve ZSM-5, an inorganic binding agent, fumed silica, an activated aluminum oxide precursor, a dispersing agent,alcohol ether, a lubricating agent, oil, an organic binding agent, alcohol and/or cellulose and pure water. The concentrated rotating wheel adsorbing material has the beneficial effects that the adsorbing material prepared from the raw materials by adopting the technology has the advantages of high molecular sieve content, high strength, high specific surface area, high adsorption and desorption ratio, low specific heat capacity, low wind resistance and the like, and solves the problems that a traditional molecular sieve adsorbing material is low in adsorption efficiency, low in strength, poorin thermal stability, short in usage period and the like.

The invention discloses a submerged arc furnace drying method. The submerged arc furnace drying method includes the following steps that firstly, a layer of fire-resisting material is flatly laid at the bottom of a submerged arc furnace lining bottom, and a fire-resisting material layer is formed; secondly, three iron roasting cylinders are placed on the fire-resisting material layer, and the three iron roasting cylinders are distributed in a regular triangular shape; thirdly, coke is contained in the roasting cylinders, and the coke particle size ranges from 10 mm to 40 mm; fourthly, a layerof coke is laid in the space between each roasting cylinder and the inner wall of a submerged arc furnace lining, the coke particle size ranges from 10 mm to 40 mm, coke layers are formed, the thickness of the coke layers is smaller than the height of the roasting cylinders, and a layer of slag making material is laid on each coke layer to form a slag making material layer; and fifthly, three electrodes matched with a submerged arc furnace are inserted into the coke in the corresponding three iron roasting cylinders and electrified to form electric loops, and furnace drying is completed afterthe slag making material layers are completely melted.

The invention belongs to the technical field of refractory products for high-temperature industrial kilns, relates to a refractory brick, and in particular, relates to a magnesium-iron-zinc-aluminum composite spinel refractory brick for a cement kiln firing zone and a preparation method of the magnesium-iron-zinc-aluminum composite spinel refractory brick. The magnesium-iron-zinc-aluminum composite spinel refractory brick for the cement kiln firing zone is composed of the following components in parts by weight: 15 to 25 parts of 5-3 mm high-purity magnesite clinker, 15 to 20 parts of 3-1 mm high-purity magnesite clinker, 5 to 10 parts of 1-0.1 mm high-purity magnesite clinker, 5 to 10 parts of 1-0.1 mm high-iron high-purity magnesite clinker, 5 to 10 parts of 1-0.5 mm fused magnesia-alumina spinel, 20 to 35 parts of high-purity fused magnesia, 5 to 12 parts of magnesia-alumina spinel micro powder, 3-10 parts of nano zinc oxide micro powder and 3-5 parts of a composite binding agent. The product prepared by the method has excellent kiln coating hanging performance, alkali corrosion resistance and thermal shock resistance stability, the using effect and the service life of the product are superior to those of traditional magnesia-chrome bricks and magnesia (ferrum) aluminate spinel bricks, and the product has important significance for prolonging the service life of a cement kiln and reducing unit consumption of refractory materials.

The invention belongs to the technical field of buildings, and particularly relates to a preparation method of modified coal cinder and an application thereof. The composite acid solution is adopted to treat coal cinder, part of aluminum oxide, magnesium oxide and the like in the coal cinder can be dissolved in the composite acid solution, the aluminum oxide and the magnesium oxide in the composite acid solution react with zircon powder and boron powder and then are solidified and adsorbed in a pore structure of the coal cinder, the sintering performance of the coal cinder is improved, and thesintering strength of the coal cinder is improved; then surface modification liquid is adopted for modification, so that the dispersing performance of coal cinder can be improved; then the reinforcing fibers and a coupling agent are blended for modification, the reinforcing fibers are grafted into the coal slag under the action of the coupling agent, and the frost resistance and corrosion resistance of the coal slag are improved. The strength, frost resistance, dispersity, sinterability and other properties of the coal cinder subjected to acid modification, surface modification and blending modification are obviously improved, and the coal cinder can be used for preparing water-permeable shale bricks. The prepared water-permeable shale brick has good water permeability, frost resistance and corrosion resistance, and is high in strength.

The invention relates to the technical field of optical fiber couplers, and discloses an optical fiber coupler, a manufacturing method of optical fiber couplers and a detection method for packaging efficacy losing of the optical fiber couplers. The manufacturing method includes the steps of stripping an optical cable PVC outer layer; manufacturing the optical fiber couplers with the parallel clamping fused biconical taper process, and detecting the longitudinal tensile strength of the optical fiber couplers through pulling force after completion of sintering; conducting primary packaging on the sintered semi-finished products; then conducting secondary packaging on the sintered semi-finished products; conducting hot bulb processing on terminals of optical fibers; placing the semi-finished products in the environment with the temperature ranging from 95 DEG C to 105 DEG C for baking for 1.5 hours to 2.5 hours, cooling the semi-finished products to the normal temperature, placing the semi-finished products in the environment with the temperature ranging from -40 DEG C to 85 DEG C for circulating for 45 hours to 51 hours, checking the sealing condition of secondary packaging through fluorine-contained oil with the temperature ranging from 85 DEG C to 95 DEG C, and screening defective products; conducting tertiary packaging on the qualified semi-finished products. By means of the manufacturing method of the optical fiber couplers, the problem that insertion losses of traditional optical fiber couplers in the low-temperature state are increased is solved, and the stability of the optical fiber couplers is improved.

The invention relates to a diamond dry-cutting saw web and specifically relates to a diamond dry-cutting saw web and a manufacturing method thereof. The diamond dry-cutting saw web comprises a substrate and a tool bit; the substrate is combined with the tool bit by use of a hot-pressing process; a plurality of metal powders used for the tool bit contain a carbon fiber powder; the weight of the carbon fiber powder accounts for 0.5%-1.5% of the weight of the plurality of metal powders; the granularity of the carbon fiber powder ranges from 200 to 500 meshes; the manufacturing method comprises the following steps: the substrate is combined with the tool bit by use of the hot-pressing process; the carbon fiber powder is added to the plurality of metal powders used for the tool bit and mixed evenly; the weight of the added carbon fiber powder accounts for 0.5%-1.5% of the weight of the plurality of metal powders; the granularity of the carbon fiber powder ranges from 200 to 500 meshes; the carbon fiber diamond dry-cutting saw web manufactured has the advantages of no tooth burning, high combination strength of the substrate and the tool bit, long dry cutting time, and safety and reliability, and also the advantage of high sintering strength.

The invention discloses a method for preparing a friction-reducing and wear-resistant porous coating on the inner surface of a shaft sleeve type part. The method comprises the following steps of: polishing the inner surface of the part, washing and drying the part; installing the part in a mechanically coating ball-milling tank; putting a certain amount of mixed powder and several hard alloy grinding balls in a ball grinding tank, wherein the mixed powder comprises nickel-based alloy powder, ceramic particle powder and Sn powder; closing the ball-milling tank, and carrying out ball milling under the protection of an inert gas to achieve mechanical coating of the inner surface of the part; and putting the coated part in a vacuum furnace, and carrying out vacuum pressureless sintering to form the friction-reducing and wear-resistant porous coating with the thickness of 1.2mm and the porosity of 5 to 25%. The prepared coating is tightly bonded to the inner surface of the part, and has small residual stress, connected and uniformly distributed pores, and excellent mechanical properties and tribological properties under oil lubrication. The method is suitable for shaft sleeve type partsmade from various materials including non-ferrous metals, is simple in process and low in cost and has no environmental pollution.