36results about How to "Promote grain growth" patented technology

The invention discloses a composite multi-layer crucible for induction melting of a bismuth aluminum alloy and a preparation method thereof.The problem in the prior art thata crucible suitable for theinduction melting of the bismuth aluminum alloy does not exist is solved. The composite multi-layer crucible comprises an inner layer crucible, a middle layer crucible and an outer layer crucible which are fixedly connected from the inside to the outside; the inner layer crucible is prepared from 92.5-97.5 parts of cerium oxide, 1.0-2 parts of calcium oxide, 0.5-2.0 parts of bismuth oxide and 1.0-3.5 parts of silicon carbide; the middle layer crucible is made of graphite; the outer layer crucible is prepared from 90-95 parts of calcium oxide, 1-3 parts of magnesium oxide, 2-4 parts of ceriumoxide, 1-1.5 parts of zirconiaand 0.5-1.5 parts of clay. The composite multi-layer crucible has a high strength structure, can shield a considerable portion of an induced magnetic field, has stable chemical properties, and has no splashing phenomenon in the smelting process, the degree of oxygenation is low, some single-layer structures can be replaced and can be reused, and the service life is long.

The invention relates to a carbon layer coated nano Mn3O4 shell-core structure material as well as a preparation method and application thereof. The nano Mn3O4@C material is synthesized by taking plant cell tissues as a structure-directing agent through dipping and step-by-step calcining. The synthesized material retains the biological form of a template, oxide nanoparticles and thin-layer biocharare formed in the step-by-step calcination process, retention of the biochar promotes Mn3O4 nano dispersion and grain growth, and the obtained material is uniform and free of obvious agglomeration. In the charging and discharging process of the battery, the biochar can effectively relieve structural collapse caused by lattice shrinkage in the lithium ion deintercalation process and provide support and protection for volume change, and in the circulation process, the carbon layer can limit nanoparticle aggregation and volume expansion and improve the performance of the battery. When the material is used as a lithium ion battery negative electrode material, after 250 cycles, the specific capacity is stabilized at 840 mAhg<-1>, and the cycle Coulombic efficiency is stabilized at 99%.

A laminated ceramic capacitor is provided which is excellent in reliability even when its dielectric ceramic layers thinned. For a dielectric ceramic in a laminated ceramic capacitor, a ceramic is used which includes a main component containing a barium titanate based composite oxide represented by the general formula: (Ba1-h-m-xCahSrmRex)k(Ti1-n-yZrnMy)O3, where Re is La or the like, M is Mg or the like, and the respective relationships of 0.05≦x≦0.50, 0.02≦y≦0.3, 0.85≦k≦1.05, 0≦h≦0.25, 0≦m≦0.50, and 0≦n≦0.40 are satisfied; and an accessory component as a sintering aid, wherein the average grain diameter of crystal grains in a sintered body is 0.6 μm or less.

The invention discloses a method for non-vacuum preparation of a nano thin film by taking a metallic compound as a precursor. The method comprises the steps of S1. preparing a metallic nano mixing solution; S2. preparing a graphite and superconductive carbon black mixing solution; S3. preparing acrylic photosensitive bisphenol A modified epoxy resin; S4. adding a reactive diluent and the like to the acrylic photosensitive bisphenol A modified epoxy resin; S5. continuing adding other materials to the acrylic photosensitive bisphenol A modified epoxy resin; S6. centrifuging; S7. coating; and S8. recoating and curing. According to the preparation method of the metallic compound thin film, which is disclosed by the invention, a non-vacuum precursor 'ink' offset printing spraying method is adopted to spray the precursor on an elastic substrate to form a metallic absorbed layer thin film; by means of a spray conversion method, dosages of raw materials and additive are easily controlled, ingredients, thickness and uniformity of the film can be conveniently controlled, and full use of addition of the superconductive carbon black and graphite can be achieved; the prepared product is low in granularity, high in bulk crystallization density, and capable of effectively improving a forbidden gap.

A ceria-zirconia-based composite oxide containing a composite oxide of ceria and zirconia is provided, in which primary particles having a particle diameter of 1.5 to 4.5 μm account for, on a particle number basis, at least 50% of all primary particles in the ceria-zirconia-based composite oxide, and the molar ratio of cerium to zirconium in the ceria-zirconia-based composite oxide is between 43:57 and 55:45.

The invention discloses a method for non-vacuum preparation of a nano thin film by taking a metallic compound as a precursor. The method comprises the steps of S1. preparing a metallic nano mixing solution; S2. preparing a graphite and superconductive carbon black mixing solution; S3. preparing acrylic photosensitive bisphenol A modified epoxy resin; S4. adding a reactive diluent and the like to the acrylic photosensitive bisphenol A modified epoxy resin; S5. continuing adding other materials to the acrylic photosensitive bisphenol A modified epoxy resin; S6. centrifuging; S7. coating; and S8. recoating and curing. According to the preparation method of the metallic compound thin film, which is disclosed by the invention, a non-vacuum precursor 'ink' offset printing spraying method is adopted to spray the precursor on an elastic substrate to form a metallic absorbed layer thin film; by means of a spray conversion method, dosages of raw materials and additive are easily controlled, ingredients, thickness and uniformity of the film can be conveniently controlled, and full use of addition of the superconductive carbon black and graphite can be achieved; the prepared product is low in granularity, high in bulk crystallization density, and capable of effectively improving a forbidden gap.

The invention relates to a method for preparing forsterite refractory material through microwave heating. The method includes: well mixing nickel-iron slag, magnesia powder and a binder, press-shaping to obtain a blank, putting the blank after being dried into a microwave reactor, and holding temperature of 1250-1340 DEG C for calcining for 10-60min to obtain a forsterite refractory material; according to formula composition, regulating and controlling a gradient temperature increase program of the microwave heating process to optimize phase transformation of the nickel-iron slag and grain growth process of the refractory material; combining with grain ratio of the nickel-iron slag and the magnesia powder, and accurately controlling porosity of the forsterite refractory material to finally obtain the forsterite refractory material which has high compressive strength and excellent thermal shock resistance. The method has the advantages of high sintering speed, low energy consumption, high production efficiency, high resource utilization rate, environment friendliness and excellent material performance and has good industrial application prospect.

A manufacturing method for a rotor core included in a rotor of a motor punches an electromagnetic steel sheet includes punching a plurality of plates for rotor core from an electromagnetic steel sheet; producing a rotor-core precursor by stacking up the plates for rotor core; manufacturing a rotor core by annealing an outer circumferential region of the rotor-core precursor at a first predetermined temperature, and annealing an inner circumferential region of the rotor-core precursor at a second predetermined temperature; the first predetermined temperature being a temperature at which grain growth of crystals of the electromagnetic steel sheet is promoted; and the second predetermined temperature being a temperature at which grain growth of the crystals of the electromagnetic steel sheet is not promoted.

The invention relates to a carbon layer coated nanometer Mn 3 o 4 Core-shell structural materials and their preparation methods and applications. Nano Mn of the present invention 3 o 4 The @C material was synthesized by impregnation and step-by-step calcination using plant cell tissue as a structure-directing agent. The synthesized material retained the biomorphology of the template, oxide nanoparticles and thin layers of biochar were formed during the step-by-step calcination, and the retention of biochar promoted the Mn 3 o 4 Nano-dispersion and grain growth, the obtained material is uniform without obvious agglomeration. During battery charging and discharging, biochar can effectively alleviate the structural collapse caused by lattice shrinkage during lithium ion deintercalation, and provide support and protection for volume changes. During cycling, the carbon layer can limit the aggregation and volume of nanoparticles. Swells, improving battery performance. When this material is used as a negative electrode material for lithium-ion batteries, it is stable at 840 mAhg after 250 cycles ‑1 High specific capacity, cycle coulombic efficiency is stable at 99%.

The invention relates to a preparation method of a lithium iron phosphate-ferrous lithium carbonate composite electrode material. The method comprises the following steps of mixing a carbon source, a lithium source, a phosphorus source and an iron source, drying the mixed material, sequentially roasting the mixed material at a low temperature and a high temperature under a non-oxidization gas environment, and naturally cooling the mixed material, mechanically grinding and sieving so as to obtain the lithium iron phosphate-ferrous lithium carbonate composite electrode material. The preparation method provided by the invention has the advantages that the technology is simple, the cost is low, the composite electrode material prepared by the preparation method provided by the invention has the advantages that the coated carbon content is small, the tap density is high, the specific surface area is 10-30m<2> / g, the specific capacity is high, great convenience is brought for formation of an electrode, the composite electrode material is used for a hybrid super capacitor, a lithium ion battery and the like.

A copper film is annealed at high pressure to enhance grain growth and remove voids. Other films, such as dielectrics, may also be suitable. High pressure can be used in conjunction with temperatures lower than room temperature for annealing or higher temperatures may be used to further enhance grain growth.

The invention discloses a composite multilayer crucible for beryllium-aluminum alloy induction melting and a preparation method thereof, which solves the problem in the prior art that there is no crucible suitable for beryllium-aluminum alloy induction melting. The composite multi-layer crucible of the present invention comprises an inner layer crucible, a middle layer crucible and an outer layer crucible which are fixedly connected sequentially from the inside to the outside; the inner layer crucible is composed of 92.5-97.5 parts of beryllium oxide, 1.0-2.0 parts of calcium oxide, and 0.5-2.0 parts of yttrium oxide. 2.0 parts, made of 1.0-3.5 parts of silicon carbide; the middle crucible is made of graphite; the outer crucible is made of 90-95 parts of calcium oxide, 1-3 parts of magnesium oxide, 2-4 parts of yttrium oxide, and 1-1.5 parts of zirconia , made from 0.5 to 1.5 parts of clay. The composite multilayer crucible structure of the invention has high structural strength and can shield a considerable part of the induced magnetic field. The chemical properties are stable, there is no splashing of the melt during the melting process, the degree of oxygenation is low, and some single-layer structures are replaceable and reusable, with long service life.