43results about How to "Change microstructure" patented technology

The invention provides a slag-corrosion-resistant magnesite-spinel brick and a preparation method thereof and relates to a slag-corrosion-resistant magnesite-spinel brick. The slag-corrosion-resistant magnesite-spinel brick is prepared from, by mass, 61-81% of fused magnesite particles and fine powder, 0-8% of magnesium aluminate spinel particles, 3-10% of magnesium aluminate spinel fine powder, 2-8% of aluminum powder, 0.5-3% of titanium dioxide, 0.5-10% of zirconium oxide fine powder and 0.1-0.5% of yttrium oxide powder. The slag-corrosion-resistant magnesite-spinel brick is obtained through the steps of material preparation, premixing of materials, mixing of the materials and forming. Slag corrosion resistance, high-temperature oxidation resistance and compactness of the magnesite-spinel brick are improved, and accordingly the aim of prolonging the service life of the magnesite-spinel brick is achieved.

The invention relates to a preparation method of core-shell molecular sieve MOR/BEA (mordenite/bromoethylamine) and mainly solves the problem that a core-shell molecular sieve layer is low in coverage in the prior art. The preparation method includes: firstly, pre-processing mordenite to obtain mordenite I; secondly, adding the mordenite I into solution of nano beta-zeolite, and adhering nano beta-zeolite seed crystal to the surface of the mordenite I to obtain mordenite II; and thirdly, adding the mordenite II to solution containing silicon source, aluminum source and template R to allow for crystallization, and performing filtration, washing, ammonium exchange and drying after crystallization to obtain core-shell molecular sieve MOR/BEA. The problem is solved well by the application of the technical scheme. The preparation method is applicable to industrial production of core-shell molecular sieve MOR/BEA.

The invention relates to a slide plate refractory with silicon nitride added and a production method thereof. The slide plate is prepared by the following raw materials in percentage by weight: 45-65% of corundum, 10-25% of zirconia-mullite and/or zirconia-corundum, 2-8% of silicon nitride, 6-18% of alumina fine powder and the balance one or more of silicon metal, carbon black and graphite powder and a phenolic resin binder accounting for 4-6% of the total above raw materials. The production method is characterized by proportionally weighing the raw materials, uniformly mixing the raw materials, obtaining the mixture through mixing, press-forming the mixture, drying the formed mixture at 190-210 DEG C for 6-10h and then carrying out nitridation firing on the dried mixture at1200-1400 DEG C. The invention has the following benefits: by adding silicon nitride and reasonably adding other components according to the amount and ratios, the slide plate composite material with structure of Al2O3-ZrO2-Si3N4-C is formed, and the oxidation resistance of the slide plate is improved; and the apparent porosity of the refractory is 1-4%, the cold compression strength is 150-220MPa, the high temperature rupture strength is 28-33MPa and such performance indexes as the oxidation resistance, the scouring resistance, the thermal shock resistance and the like are all excellent or good.

The invention provides a scanning type laser-assisted micro-arc oxidation device and method. The device is not limited by the size of the electrolytic cell and does not require power supply of ultra-high power and can perform local strengthening or repairing treatment so as to reduce the energy consumption, improve the film forming efficiency and the film layer quality, reduce micro-arc oxidationarcing voltage and energy consumption, perform micro-arc oxidation more easily and enter a film forming stage more quickly, realize machining of large-size workpieces or workpieces with complex moldedsurfaces, solve the problems of the area effect and point discharge in the traditional machining device, the reduce limitation of the workpiece size on the power output power and realize micro-arc oxidation of a specific area controlling an inter-electrode electric field.

The invention discloses a casting method of a rare earth alloy copper strip; the specific of the casting method is as follows: charging-covering-smelting-blending and dregs catching-warming a converter and pouring copper water-adding rare earth-horizontally continuous casting; wherein the additive amount of the compound rare earth accounts for 0.03-0.05% of the weigh of copper material; the compound rare earth comprises lanthanum and chromium which account for 0.01-0.07% of the weigh of the rare earth; zinc accounts for 0.5-5.0% of the weigh of the rare earth; chromium accounts for 0.5-5.0% of the weigh of the rare earth; and zirconium accounts for 0.5-5.0% of the weigh of the rare earth. The casting method effectively removes various complex harmful impurities brought about by waste material and plating white material by adding compound rare earth into a heating preserving furnace. The casting method can effectively improve the form, size and distribution of sulfide, improves the machining operation performance, causes the copper strip to have good welding performance, the mechanical property of the copper strip to be increased, and the overall performance of the phosphor bronze strip to be better.

The invention relates to the field of materials, in particular to an environment-friendly bentonite adsorbent and a preparation method thereof. The environment-friendly bentonite adsorbent is prepared from, by weight, 60-75 parts of bentonite, 7-13 parts of chitosan, 4-5 parts of starch, 4-5 parts of partially hydrolyzed polyacrylamide, 0.7-1.5 parts of cetyl trimethyl ammonium bromide and 11-15 parts of microbead particles with the particle size of 0.1-5 microns. Through the modification of the micro-bead particles and the bentonite by various organic substances, the adsorbent with a good adsorption property is finally prepared. The partially hydrolyzed polyacrylamide can be effectively grafted onto the starch to increase the grafting rate of nonionic groups on the starch. The microbead particles are filled among bentonite particles. Through the modification of the outer surfaces of the micro-bead particles and bentonite by the organic substances, the surface activity and micro-structures of interlayers are changed to improved the adsorption property of the adsorbent.

The invention belongs to the technical field of metal material thermal treatment and particularly relates to a processing method for improving corrosion resistance of an Mg-Y-Nd based alloy. The method comprises the steps that the to-be-processed alloy is subjected to deep cooling and solid solution treatment, soaked in a liquid nitrogen environment for quenching after being treated, and placed inthe liquid nitrogen environment after being quenched; and then the alloy is subjected to deep cooling aging treatment again, soaked in the liquid nitrogen environment for quenching after being treated, and placed in the liquid nitrogen environment after being quenched, the sample is completely stabilized at the liquid nitrogen temperature of minus 196 DEG C, and thus the magnesium alloy with thecorrosion resistance improved is obtained. By adoption of the method, the corrosion resistance of the Mg-Y-Nd based alloy can be remarkably improved while the excellent mechanical performance is ensured. The application range of the Mg-Y-Nd based alloy treated by the deep cooling treatment process is broad.

The invention discloses a method for improving low-carbon aluminum killed steel blank hot cracks by adopting low-voltage pulse current, belonging to the technical field of improving the steel blank hot cracks. According to the method disclosed by the invention, when a low-carbon aluminum killed steel blank is cut by a continuous casting machine, pulse current is applied to the low-carbon-aluminumkilled steel blank; the pulse current parameters are as follows: the pulse voltage is 21-35 V, the pulse current is 35-100 A and the pulse frequency is 20-50 Hz; and low-carbon aluminum killed steel is the aluminum killed steel with omega[C] which is less than 0.25%, wherein omega[Al] is more than or equal to 0.01% and less than or equal to 0.40%. According to the method disclosed by the invention, the low-voltage pulse current is adopted, microcosmic tissues of the low-carbon aluminum killed steel blank are changed, and the high-temperature mechanical property of a casting blank is improved,so that the hot cracks of the casting blank are effectively reduced; and the normal production is not influenced by the method, the existing production process does not need to be changed, alloy elements do not need to be added, temperature-reduction treatment does not need to be carried out on the casting blank, no pollution to the casting blank and equipment is generated, and no harms on workers are formed, so that the method is an environment-friendly, safe and new technology for reducing defects of the casting blank.

The invention discloses high-strength wear-resistant steel and a production method of the high-strength wear-resistant steel and belongs to the technical field of steel production. The high-strength wear-resistant steel is mainly prepared by mixing the components of by weight, 5-10% of silicon, 3-6% of tungsten, 3-6% of manganese, 2-5% of phosphorus, 2-5% of sulfur, 0.2-3% of carbon, 0.1-3% of niobium, 0.1-2% of titanium, 3-10% of molybdenum, 2-6% of chromium, 1-4% of boron, 3-8% of a binder, 0.5-5% of a wear-resisting agent, 0.1-3% of a flame retardant, 1-5% of a molding agent, 0.2-6% of a reinforcing agent, 1-5% of an antioxidant and the balance iron. The production method of the steel is simple and effective, and the obtained steel has good hardness, wear resistance, yield strength and tensile strength.

The invention discloses a method for molding gradient materials by interlayer laser improved selective laser melting. A laser surface modifying process is integrated with a selective laser melting process; and through a laser modifying mode for rescanning of molded parts by laser beams after molding of a certain number of lasers through selective laser melting at each time, microscopic structuresand performances of different areas of the parts are changed to obtain high-performance parts with different performances and gradients. Meanwhile, through rescanning by the laser beams, such defectsas holes in the layers, micro cracks and surface projections can be eliminated, so that the compactness and the surface quality of the molded parts are improved. The structure and performance change of the parts can be realized through modes of adjusting the set layer number, the laser rescanning power, the laser beam scanning speed and the laser beam scanning gap. When the compactness of the molded parts is improved, the direct molding of multi-performance gradient materials by the selective laser melting technology is realized, and a significant effect on promotion of the industrial technology development is achieved.

A building curtain wall comprises a cement-based heat insulation inner layer plate and a curtain wall metal outer layer plate attached outside the cement-based heat insulation inner layer plate, and the curtain wall metal outer layer plate is coated with an antirust agent. A copper alloy plate serves as the curtain wall outer layer and has high strength, high hardness and good heat conductivity, so that when the copper alloy plate serves as the curtain wall outer vertical face, the service life is prolonged, the plate is not prone to being damaged, and the maintenance expenses and maintenance workloads are reduced. The antirust agent on the copper alloy surface can rapidly form a nanoscale protection layer on the copper alloy surface, and after the nanoscale protection layer is formed on the metal surface, a matrix has the superior corrosion prevention performance, environmental pollution is small, skin is not burned during using, damage is avoided, and the building curtain wall is safe, reliable and easy to operate.

The invention relates to compound brazing filler metal used for hard alloy tool brazing. The compound brazing filler metal is composed of 25%-27% of Ag, 37%-39% of Cu, 3.0%-5.0% of Mn, 2.0-4.0% of Ni,1.5%-2.5% of In, 0.5%-1.0% of nano-SiCp, 0.15%-0.3% of Si, 0.1%-0.2% of B, 0.05%-0.1% of Co, 0.01%-0.05% of Fe, 0.01%-0.1% of La, Ce and Y mixed rare earth and the balance Zn, wherein the mixed rareearth includes at least two of La, Ce and Y. A preparation method includes the steps that firstly, raw materials are weighed according to the ratio; secondly, segmented variable-speed high-energy ballmilling is conducted on Cu powder and nano-SiCp to obtain Cu/nano-SiCp particles; thirdly, the Ag, Cu ingots, the Zn, the Mn, the Ni, the Si, the Co and the Fe are placed in a medium-frequency induction smelting furnace to be heated and molten, and then the In, the B, the Cu foil wrapped mixed raw earth and the Cu/nano-SiCp particles are sequentially added in a crucible; fourthly, the mixture ismoved into a well type resistance furnace to be subjected to ultrasonic vibration and squeeze casting forming; and fifthly, hot rolling and cold rolling are conducted on cast ingots to form the foil sheet brazing filler metal. By means of segmented variable-speed ball milling and ultrasonic vibration, uniform dispersion of the nano-SiCp is ensured, the brazing filler metal is good in wettability and joint filling capacity, the brazing manufacturability is good, the preparation method is simple, and the finished product rate is high.

The invention discloses anti-corrosion rolled steel and a manufacturing method thereof, and belongs to the technical field of rolled steel. The anti-corrosion rolled steel is formed by mixing the following main components including, by weight, 5-10% of silicon, 3-6% of tungsten, 3-6% of manganese, 2-5% of phosphorus, 2-5% of sulfur, 0.2-3% of carbon, 0.1-3% of niobium, 0.1-2% of titanium, 3-10% of molybdenum, 2-6% of chromium, 1-4% of boron, 3-8% of a binder, 2-7% of an anti-corrosion agent, 0.1-3% of a fire retardant, 1-5% of a forming agent, 0.2-6% of a passivator, 1-5% of an antioxidant and the balance iron. The manufacturing method of the rolled steel is simple and effective, and the manufactured rolled steel has good hardness, corrosion resistance, yield strength and tensile strength.

The invention belongs to the technical field of metallurgical refractory matters and relates to an additive for stemming for inhibiting iron notch splash. The additive comprises the following components in parts by weight: 1-3 parts of silicon metal, 0.4-0.6 part of boron carbide, 2-8 parts of asphalt, 0-5 parts of silicon nitride and 2-8 parts of kyanite. When the additive for stemming for inhibiting iron notch splash disclosed by the invention is added into the stemming, a proper amount of glass phase components can be generated at high temperature, and possible cracks generated in an iron notch channel can be plugged by the glass phase contacted with molten iron under the condition that the high-temperature performance is not influenced, so that splash caused by gas channeling is effectively prevented. Moreover, the additive has the advantages of proper micro expansion effect, medium and high temperature strength, slag iron erosion resistance and oxidation resistance.

The invention belongs to the technical field of electronic ceramic materials, and provides a dielectric ceramic material for a BT-BRT composite ultralow-loss multilayer ceramic dielectric capacitor, apreparation method and application thereof. The dielectric ceramic material is prepared by mixing a BT-BRT compound and a modified additive. The dielectric constant of the dielectric ceramic materialis 40 at 1MHz, the dielectric loss value tg delta is less than 1.5*10<-4>, and the dielectric loss value is small; and in a temperature range of -55 to 125DEG C, the capacity temperature coefficientis closer to zero, and the COG characteristic of the American EIA standard is met. The preparation method of the dielectric ceramic material comprises the following steps of: (1) synthesizing Ba2Ti9O20; (2) synthesizing Ba6-3xRe8+2xTi18O54; and (3) preparing the dielectric ceramic material. The preparation method can effectively improve the dielectric loss of the dielectric ceramic and improve thereliability of the dielectric ceramic material.