77results about How to "No sintering" patented technology

The invention discloses a method for preparing monodisperse oxide nanoparticles. The method comprises the steps of firstly, preparing hydrosol containing a soluble salt and a nano-oxide precursor, then, mixing the hydrosol with a low-polarity solvent so as to precipitate the soluble salt in a superfine nanoparticle state and co-precipitate the soluble salt with nano-oxide precursor particles, subjecting the co-precipitate to centrifugation, washing and drying, carrying out calcination at a temperature below the boiling point of the salt so as to convert the nano-oxide precursor into a nano oxide, washing off the soluble salt, and carrying out drying, thereby obtaining the monodisperse oxide nanoparticles. During the preparation, the soluble salt exerts an isolating action, and the precursor nanoparticles or oxide nanoparticles can be effectively prevented from agglomeration and sintering in a high-temperature calcination process. According to the method, the temperature range for preparing monodisperse nano-oxides is widened greatly, and the process is simple and convenient and is low in cost.

This invention provides a sliding component of a compressor that has a high tensile strength, can develop satisfactory durability during operation, can realize ''familiarity'' in the earliest possible stage, and does not cause seizing during abnormal operation. Sliding components of compressors (17, 23, 24, 26, 39, 60, 96, 310b, 524, 526, 644, 646, 724, 726, 734, 736, 817, 821, 823, 824, 825, 826, 827, 921, and 924)comprise 2.0 to 2.7% by weight of carbon and 1.0 to 3.0% by weight of silicon with the balance consisting of iron containing unavoidable impurities. In this case, graphite is smaller than flake graphite in flake graphite cast iron, and the hardness of at least a part thereof is higher than HRB90 and lower than HRB100.

The invention discloses a preparation method of a ZnO composite photo-anode of a dye-sensitized solar cell. The preparation method includes the steps of firstly, growing a ZnO nanometer wire array on a conductive substrate, and then growing and filling ZnO nanometer particles in situ in gaps between nanometer wires. By means of the preparation method, the specific area of the ZnO composite photo-anode is enlarged, and therefore the photovoltaic conversion efficiency of the photo-electrode is remarkably improved; meanwhile, the nanometer wires grow in a specific direction perpendicular to the substrate, and therefore the electronic transmission speed can be increased. In addition, the preparation method is easy to operate, free of sintering, short in response time when the nanometer particles grow in the gaps of the ZnO nanometer wire array, capable of reducing cost and beneficial to industrial production of the photo-anode. Due to the advantages of the photo-anode of the dye-sensitized solar cell, the dye-sensitized solar cell with the ZnO composite photo-anode can be widely applied to the solar cell field.

A three-element nano-catalyst for the metallic cellular carrier used to treat the tail gas of car is proportionally prepared from lanthanum oxide, zirconium oxide and cerium oxide through dissolving them in deionized water, adding surfactant, hydrothermal treating, washing, filtering, dispersing it in organic solvent, adding the solution of noble metal, stirring, baking and calcining. Its coating technology includes such steps as ultrasonic cleaning of metallic cellular carrier multiple times, dispersing said nano-catalyst in organic solvent, stirring, baking, coating and calcining.

The invention discloses a non-burnt brick prepared from unwanted soil residues and a preparation method thereof. The non-burnt brick comprises, by mass, 1200 to 1500 parts of unwanted soil residues, 200 to 400 parts of cement, 10 to 30 parts of a polymerizer, 1 to 15 parts of a curing agent and 1 to 30 parts of an additive. The preparation method for the non-burnt brick comprises the following steps: drying and crushing the unwanted soil residues, then blending the crushed unwanted soil residues with the cement and the polymerizer and carrying out granulation to form stable soil particles which are used for replacing conventional sand and stone as a framework material for the non-burnt brick; and mixing the stable soil particles with the cement, the curing agent and the additive to prepare the non-burnt brick. The non-burnt brick prepared from unwanted soil residues has a strength grade of Mu5.0 to Mu30 and a softening coefficient of 80 to 98%, and the water absorption rate, durability, radioactivity and the like of the non-burnt brick meet standard requirements. The invention has the beneficial effects that unwanted soil residues are recycled; environmental pollution is reduced; natural resources are saved; production cost for constructional bricks is lowered; the preparation method is simple and convenient; and substantial social benefits and economic benefits are produced.

The invention discloses a red-mud-fly-ash high-strength heat-preservation building block based on alkali excitation. Industrial waste fly ash and red mud serve as main raw materials, cement and quicklime serve as auxiliary materials, and fly-ash pottery sand or shale pottery sand serve as heat-preservation materials. The building block is prepared from, by mass, 18-40% of red mud, 18-30% of fly ash, 25-40% of pottery sand, 3-8% of cement, 3-10% of lime, 1-3% of straw fibers and 0.5-2% of early strength agents, the water content is 10-15%, aging is conducted for 8-36 hours, and molding is conducted under the pressure of 40 MPa; the building block is prepared by the steps of drying, grinding, weighing, mixing of the auxiliary materials, compression molding, standard maintenance and natural curing. The red-mud-fly-ash high-strength heat-preservation building block based on the alkali excitation has the advantages of being simple in molding process, capable of having a reaction and being cured quickly at room temperature, and free from sintering and stream-pressure, products of the building block are high in compressive strength and anti-dry-shrinkage performance and good in impermeability, and can be stored for a long time without scumming phenomena. A large amount of industrial waste can be utilized, the energy and resources are saved, and the cost and energy consumption are low.

The present invention relates to an application of a NiO/MgO solid solution catalyst in a coke oven coal gas steam reforming hydrogen production method at a low water carbon ratio, wherein a mass percentage of Ni is 6.9-43%, and the catalyst has characteristics of simple preparation process, high activity at a high temperature and a low water carbon ratio, no carbon deposition and good stability. According to the present invention, during a reforming process at a temperature of 875 DEG C and a H2O/CH4 ratio of 1, a methane conversion rate is maintained to 95-98%, and a carbon dioxide conversion rate is maintained to 52-54%; at a temperature of 875 DEG C and SV of 12600 mL/g.h, when a H2O/CH4 molar ratio is increased to 0.9 from 0.3, a methane conversion rate is correspondingly increased to 98.3% while a carbon dioxide conversion rate is reduced to 67.2% from 88. 4%; and when a reaction temperature is increased to 900 DEG C from 600 DEG C, a methane conversion rate and a carbon dioxide conversion rate are respectively increased to 98.7% and 601%.

The invention discloses a geopolymer permeable brick, which comprises a base layer and a decorative layer. The base layer comprises aggregate A, a gelling material A, and an exciting agent. The decorative layer comprises aggregate B, a gelling material B, and an exciting agent. The invention further provides a preparation method of the geopolymer permeable brick. The provided geopolymer permeable brick has the advantages that the sintering is not needed; the preparation energy consumption is low; the moulding can be carried out without pressure; the technology is simple, and a large amount of solid waste is consumed. The 28d compression strength of the permeable brick is 32.3 MPa or more. The 28d rupture strength is 3.18 MPa or more. The permeation coefficient is 0.028 cm/s or more.

The invention provides a low-voltage intelligent synchronous switch. The switch comprises a control module, a current detection module, a voltage detection module, an input module, a zero-crossing switching module, a communication module, a power module, and a display module. The control module is connected with other seven modules. The power module is connected with the zero-crossing switching module, the communication module, and the display module. Through cooperation of the zero-crossing switching module and the control module, the switch can be switched to a capacitor or an AC power switch on a zero-crossing point, realizing switching-in of the capacitor on a voltage zero-crossing point and switching-off on a current zero-crossing point. In a switching process, the switch has no inrush current, no electric arc, and switch contacts are not damaged. The switch has no inrush current in switching, contacts do not sinter, and the switch is small in volume, low in energy consumption, and does not lead in transient state and harmonic waves. The switch can adapt to various extreme cold extreme hot harsh environment, and can satisfy various occasions of reactive capacity requirements.

The invention discloses a high-entropy alloy surface carburizing modification method. The method comprises the steps that (1), an HfZrTiTa high-entropy alloy is pre-treated; (2), active carbon is selected as a carburizing agent, a carburizing container is naturally filled with the carburizing agent, and the pre-treated HfZrTiTa high-entropy alloy is buried into the upper middle portion of the carburizing agent; (3), the carburizing container is sealed; and (4), the sealed carburizing container is placed into a heating device, heating is conducted till the temperature is 700-900 DEG C, then heat preservation is conducted for 2-10 h, after treatment is finished, the carburizing container is taken out for air cooling, then a sample subjected to carburizing treatment is taken out to be subjected to ultrasonic washing and drying, and a high-entropy alloy with the surface subjected to carburizing modification is obtained. According to the high-entropy alloy surface carburizing modification method, the surface hardness and the high-temperature oxidation resistance of the HfZrTiTa high-entropy alloy can be effectively improved at the same time.

The invention discloses a polystyrene color steel sandwich panel. The polystyrene color steel sandwich panel comprises a core board, wherein the core board is a polystyrene fireproof thermal insulation board; two color steel plates respectively bonded to both sides of the polystyrene fireproof thermal insulation board; two side plates and two sealing plates respectively bonded to the two long sides and the two short sides of the polystyrene fireproof thermal insulation board. A fireproof thermal insulation adhesive is used for fireproof coating modification of a polystyrene foam board, so thatthe fireproof thermal insulation adhesive penetrates the polystyrene foam board to prepare the polystyrene fireproof thermal insulation board. The polystyrene color steel sandwich panel prepared by using the polystyrene fireproof thermal insulation board has the advantages of high bending strength, high compressive strength, good endurance, good combustion performance and no collapse in a fire field.

The invention discloses a rapid condensation high-strength flame retardant thermal insulation material and a preparation method thereof. The rapid condensation high-strength flame retardant thermal insulation material is prepared from the following raw materials in percentage by weight: 5-55% of metallic oxide, 5-55% of phosphate, 1-10% of additive, 0.5-5% of fiber material, 0.5-50 of thermal insulation component and 5-50% of water. The rapid condensation high-strength flame retardant thermal insulation material is high in condensation speed; when the material is placed for 4 hours at a normal temperature, the compression strength of the thermal insulation material can reach 20MPa, and the breaking strength can reach 3.5MPa; and when the material is placed for 8 days at a normal temperature, the compression strength of the thermal insulation material can reach 60MPa, and the breaking strength can reach 10MPa. The thermal insulation material has good compatibility with concrete, cement and the like and high cold resistance and can be used under low temperature conditions of 0-10 DEG C. The rapid condensation high-strength flame retardant thermal insulation material can be directly sprayed to walls, roadway walls, tunnel walls and the like or is poured into a grinding tool with appointed size and shape and is compacted and shaped by vibration.

The invention discloses a burn-free heat-insulation external tile produced from gangue. The burn-free heat-insulation external tile is produced from the following raw materials in percentage by weight: 40-63 percent of gangue, 2-9 percent of cement, 15-32 percent of a binding agent, 3-9 percent of adhesive, 0.05-1 percent of water reducer, 0.45-3 percent of an initiator, 2-15 percent of foams for foaming and 1.5-4 percent of an accelerant. In addition, the invention also provides a production method of the burn-free heat-insulation external tile produced from gangue. The heat-insulation external tile is free of burning, easily realizes batch production, has excellent safety performance and is environmental friendly, the energy source is saved, the production cost is reduced, the waste gangue is comprehensively utilized, and the land occupied by stacking the gangue is reduced; the produced heat-insulation external tile has the advantages of light weight, high strength, low cost and the like and makes a contribution to the development of building heat-insulation materials in China.

The invention belongs to the technical field of flue gas denitration, and relates to a small-aperture corrugated catalyst for gas denitration, and a preparation method thereof. The catalyst adopts a glass fiber mat as a skeleton base material, one or two of titanyl sulfate and silicon oxide as a carrier, one or two of ammonium heptamolybdate and cerium salt as an assistant and one or more of a manganese salt, an iron salt and a chromium salt as an active component precursor and deionized water; and the catalyst comprises, by weight, 90 parts of the carrier, 1.6-6.5 parts of an active componentprecursor, 3.8-5.1 parts of the assistant and 120-200 parts of deionized water. The catalyst adopts the titanyl sulfate and silicon oxide as the carrier, so that the catalyst is ensured to have goodthermal stability at a high temperature, and crystal form change and sintering are avoided; the manganese salt, the iron salt and the chromium salt are used as active components, so hole blockage caused by high solution viscosity can be avoided; and the ammonium heptamolybdate and the cerium salt are used as modification aids, so that the catalyst has an extremely high catalytic performance in anSCR reaction.

The invention discloses a small-pore catalyst for fuel gas denitration and a preparation method. The small-pore catalyst is prepared from the following raw materials in parts by weight: 100 parts of a carrier, 2.20-8.21 parts of an active component precursor, 0.45-1.4 parts of aids and 150-250 parts of deionized water, wherein the carrier comprises aluminum titanate, zirconium oxide and tungsten oxide; the active component precursor comprises a nickel salt, a chromium salt and a ruthenium salt; and the aids comprise tetraethoxysilane, hydroxypropyl methyl cellulose, tung oil, aluminum dihydrogen phosphate, graphite and calcined kaolin. The preparation method comprises the following step: 1) performing ball milling; 2) kneading the raw materials; 3) blanking; 4) shaping blanks; and 5) calcining the blanks. The small-pore catalyst is applicable to nitric oxide removal of gas turbine sets, has the advantages of being high in denitration efficiency, small in size, long in service life and the like, has good application prospects, and is suitable for industrial application.

Provided is a lubricant for machining aluminum alloys and the like which exhibits superior seizure resistance. The lubricant for machining according to the present invention is interposed between the coated surface of a machining tool coated with an amorphous carbon film and the surface to be machined of a material to be machined which comprises aluminum or an aluminum alloy material and is to be machined by contact with the coated surface. The lubricant for machining is characterized in that 100 mass% of the lubricant comprises 8-50 mass% of a macromolecular compound having a molecular weight of 8,000-1,000,000 and having surface functional groups consisting of at least one type of group among carbonyl groups, amino groups, carboxyl groups and hydroxyl groups. Such a macromolecular compound having a high molecular weight strongly adheres to an amorphous carbon film or the like on a machining tool. As a result, the presence of the lubrication film between the machining surface and the surface to be machined is ensured, thereby inhibiting the direct contact of the surfaces and thus seizing, even when aluminum alloys, which are highly susceptible to seizing, are highly deformed.

The invention discloses a composite for an organic metal catalyst and a preparation method thereof, and relates to the technical field of denitrification catalyst. The composite adopts cross-linked modified carbon nanotubes for being loaded with V2O5-MoO3/TiO2 having good catalytic oxidation denitrification performance, adopts attapulgite to wrap platinum metal so as to improve the catalytic oxidation activity of the platinum metal, and is prepared from a common organic metal catalyst dioctyl tin dilaurate as a heat stabilizer with a variety of fillers and additives. The preparation method issimple. The composite for the organic metal catalyst has the advantages of large specific surface area, good thermal stability, and good activity and selectivity, and cannot cause alkali metal poisoning, sintering, blockage and erosion phenomena after long-term use.

The invention discloses a preparation method and application of a composite metal oxide catalyst for coal gasification. According to the preparation method, lanthanum nitrate, nitrate metal salt A, ferric nitrate and nitrate metal salt B are added into water and mixed evenly to prepare a metal nitrate solution; then EDTA (ethylene diamine tetraacetic acid) and citric acid are mixed evenly, the pHvalue is adjusted to 7-9, and the mixture is stirred evenly in a constant temperature water bath to prepare a precursor solution; the metal nitrate solution is added to the precursor solution, and stirring is performed until a wet gel is formed; and the composite metal oxide catalyst is obtained by drying, calcining and cooling. The composite metal oxide catalyst for coal gasification can not onlyeffectively increase the gasification rate of coal, with the conversion rate reaching 90%; but also maintain the original structure and catalytic activity after the reaction, so that reutilization can be achieved through recycling.