12results about How to "Uniform grain distribution" patented technology

The invention provides microcrystalline cast stone and a preparation method and application thereof. According to the preparation method of the microcrystalline cast stone, adopted raw materials comprise 35-70 wt% of vanadium-titanium magnet tailings; wherein the content of TiO2 in the vanadium-titanium magnet tailings is not lower than 0.9 wt%, and / or the content of Fe2O3 is not lower than 9.8 wt%, and / or the raw materials further comprise a nucleating agent not higher than 7 wt%. The vanadium-titanium magnet tailings are used as main raw materials, endowed characteristic elements such as Fe and Ti in the vanadium-titanium magnet tailings are used as nucleating agents in the microcrystal cast stone production process, the low adding amount of the nucleating agents can be achieved, and even when the content of TiO2 and / or Fe2O3 in the vanadium-titanium magnet tailings is high enough, zero-adding nucleating agents can be achieved. Furthermore, the vanadium-titanium magnet tailings are taken as a main material and supplemented with other solid waste raw materials, solid waste matching is reasonably carried out, the solid waste mixing amount is increased, and the microcrystalline cast stone can be prepared from nearly all solid wastes. Further, the building material prepared from the material has a wide application prospect.

The invention discloses a technological method for refining oxygen-free copper plate crystal grains. The technological method comprises the following steps that an electrolytic copper plate is placed in a furnace bin to be melted, the surface of the electrolytic copper plate is covered with charcoal, semi-continuous casting billet drawing is carried out, and an oxygen-free copper cast ingot is produced; the oxygen-free copper casting blank is put into a heat preservation furnace to be preheated, the preheating temperature ranges from 800 DEG C to 900 DEG C, and the heat preservation time ranges from 2 hours to 3 hours; the preheated cast ingot is subjected to upsetting and drawing, the upsetting deformation is 50%-60%, the cast ingot is drawn to 150%-160% of the original cast ingot, and the upsetting and drawing times are 3-4 times; warm forging and square drawing are started, the warm forging temperature ranges from 700 DEG C to 750 DEG C, the cast ingot is upset to 50%-60% of the original length, square drawing is conducted to the needed blank length, and the final forging temperature is kept to be larger than or equal to 700 DEG C; the blank is cooled to the room temperature, cold forging is started, multiple passes of cold forging are conducted, the rolling reduction of each pass is 10%-15%, and the final cold forging deformation is 30%-60%; and the oxygen-free copper blank obtained after cold forging is subjected to aging heat treatment, the aging heat treatment temperature ranges from 350 DEG C to 450 DEG C, the aging heat treatment time ranges from 1 h to 2 h, air cooling is conducted after annealing, and the oxygen-free copper plate is obtained.

A pneumatic lifting and rotating distributing device for a squat silo comprises a grain conveying pipe, a transfer granary and a lifting system. A telescopic grain channel formed by a plurality of layers of telescopic conical barrels is arranged below the transfer granary, the telescopic conical barrel on the bottommost layer is connected with a reducer pipe with a valve, a lower pipe opening of the reducer pipe is connected with an inner ring of a slewing bearing, and a rotary distributing cylinder is connected below an outer ring of the slewing bearing. The height of the lifting platform and the opening and closing of the valve in the reducer pipe are controlled through the hoisting equipment so as to ensure that grains are gradually scattered from the bottom of the silo upwards to enter the silo, the grain grading phenomenon is reduced, the pneumatic motor drives the material distribution groove to rotate, and uniform grain distribution in the same grain surface height is ensured. By controlling the opening and closing of the valve in the reducer pipe and the telescopic grain channel, the grain flows in a limited manner when entering the grain silo, and does not freely fall, so that the grain silo disclosed by the utility model is prevented from being automatically graded and crushed when entering the grain silo.

The invention belongs to the technical field of fluorescent ceramic preparation, and relates to an enhanced near-infrared luminescence MgAl2O4: Cr < 3 + > fluorescent ceramic and a preparation method thereof, and the preparation method comprises the following steps: dissolving Mg (NO3) 2.6 H2O, Al (NO3) 3.9 H2O and Cr (NO3) 3.9 H2O in deionized water, then adding urea, stirring and dissolving; transferring the mixed solution into a reaction kettle for hydrothermal reaction to obtain MgAl2O4: Cr < 3 + > powder; adding a sintering aid CaF2 into the MgAl2O4: Cr < 3 + > powder, and carrying out ball milling and mixing; the ball-milled powder is poured into a mold to be compacted and then put into an SPS sintering furnace to be sintered; the sintered ceramic is subjected to annealing treatment; the surface of the annealed ceramic is sequentially subjected to coarse grinding and polishing operation, and the MgAl2O4: Cr < 3 + > fluorescent ceramic is obtained. According to the method, the luminescent property of Cr < 3 + > is remarkably promoted, and meanwhile, the high density and excellent mechanical property of the ceramic are guaranteed.

The invention relates to the field of silicon carbide materials, in particular to a preparation method for reactive sintering of a silicon carbide material by introducing an active carbon source and a product thereof. The preparation method comprises the following steps: (1) mixing silicon carbide powder, a silicon source, a carbon source, a binder and water to form pug, and molding the pug to obtain a silicon carbide green body; (2) carrying out heat treatment on the silicon carbide green body in an inert atmosphere; and (3) laying graphite powder on the silicon carbide green body subjected to heat treatment until the whole silicon carbide green body is wrapped, and sintering to obtain the silicon carbide material, the carbon source comprises graphene and / or nano carbon black; the temperature of the heat treatment is 550-650 DEG C; the heat treatment time is 1-2 hours. The silicon carbide material disclosed by the invention has relatively high volume density and breaking strength.

A wind turbine reducer, relating to the field of wind power equipment technology, is used to solve the technical problems of high processing cost, difficult operation, and low precision in existing technologies. In the wind turbine reducer, the upper body, the first steel tube internal gear ring, and the support base are connected by the first bolt; the support base, the second steel tube internal gear ring, and the lower body are connected by the second bolt. Because the production process of the steel tube internal gear ring is relatively simple and is usually mass-produced, material procurement is relatively stable, and its price is lower than that of forging materials, thus effectively reducing material costs. At the same time, compared to forging materials, it saves the cost of mold making, and the internal microstructure of the steel tube internal gear ring has a uniform grain distribution, resulting in stable mechanical properties and effectively simplifying the processing flow. Furthermore, the design of the steel tube internal gear ring can be applied to wind turbine reducers of different specifications and types, thus having wide applicability and being suitable for various specifications.

The invention relates to the field of silicon carbide ceramic materials, in particular to a preparation method of a high-performance silicon carbide material and a product thereof. The preparation method of the high-performance silicon carbide material comprises the following steps: mixing and stirring silicon carbide powder, a carbon source, a binder and water to obtain pug, and molding the pug to obtain a silicon carbide green body; carrying out heat treatment on the silicon carbide green body in an inert atmosphere; and embedding the silicon carbide green body subjected to heat treatment into silicon powder, and sintering to obtain the silicon carbide material, the temperature of the heat treatment is 300-500 DEG C; the heat treatment time is 1-2 hours. According to the invention, heat treatment is carried out in an inert atmosphere, and the in-situ active carbon source generated by pyrolysis of the binder is uniformly distributed in the green body, so that the proportion of the active carbon source is effectively increased. And a beta-SiC binding phase is quickly and efficiently generated in a manner of externally adding a carbon source, so that the content of silicon carbide in the product is effectively increased, and the bending strength is improved while the thermal expansion coefficient is reduced.

The invention discloses an aluminum alloy profile for a new energy automobile, and belongs to the technical field of new energy materials. The aluminum alloy profile comprises the following components in percentage by mass: 0.14%-0.19% of Fe, 0.58%-0.66% of Si, 0.6%-1.3% of Mg, 0.25%-0.35% of Cu, 0.07%-0.15% of Mn, 0.14%-0.22% of Cr, 0.01%-0.05% of Zn, 0.03%-0.15% of Ti, 0.6%-0.9% of composite rare earth metal elements and the balance of Al and impurities, and the total content of the impurities is not greater than 0.25%. According to the method, the aluminum alloy profile is optimized from the two aspects of element composition and surface treatment, rare earth metal elements La, Pr and Gd with different atomic radiuses and qualitative change capacities are added, grains of the aluminum alloy are effectively refined, a surface treating agent is sprayed subsequently, and the mechanical property and corrosion resistance of the aluminum alloy profile are effectively improved.

The invention discloses an Al-Sc alloy and a preparation method and application thereof. The preparation method of the Al-Sc alloy comprises the following steps that (1) metal aluminum is added into metal scandium in a molten state in batches for smelting, and an Al-Sc alloy ingot is obtained; the smelting mode is suspension smelting; the adding frequency n of the metal aluminum is greater than 1; (2) the Al-Sc alloy ingot is subjected to ultrasonic powder making, and Al-Sc alloy powder is obtained; a crucible adopted in the ultrasonic powder preparation process is made of aluminum nitride; and (3) the Al-Sc alloy powder is sequentially subjected to cold isostatic pressing forming and hot isostatic pressing sintering, and the Al-Sc alloy is obtained. The Al-Sc alloy provided by the invention can cover the Sc content of 5at.%-70at.%, and has the advantages of low oxygen content and high density.

The invention belongs to the field of target material preparation, and particularly discloses a tantalum target material and a preparation method and application thereof. According to the method, stress annealing, cold forging and pressing, heat treatment, two-stage rolling in different directions, intermediate static pressure treatment and recrystallization annealing are sequentially carried out on the tantalum ingot, all the steps are matched with one another, so that grain distribution of the tantalum target is more uniform, grains are finer, the {111} grain orientation proportion is higher, the sputtering speed and sputtering stability are controlled, and the sputtering quality is improved. The uniformity of sputter coating is improved, and the purpose of improving the film forming quality is achieved.

The invention belongs to the field of target material preparation, and particularly discloses a tantalum target material and a preparation method and application thereof. According to the method, stress annealing, multiple groups of cold forging and pressing and heat treatment, two-stage rolling, intermediate heat treatment and recrystallization annealing are sequentially carried out on the tantalum ingot, all the steps are matched with one another, so that grain distribution of the tantalum target is more uniform, grains are finer, and on the basis that good uniformity and film quality of sputtering film forming of the tantalum target are kept, the yield of the tantalum target is improved. The ratio of the average area of crystal grains with the {100} face oriented in the normal direction to the average area of crystal grains with the {111} face oriented in the normal direction is increased, the deposition rate of sputter coating is increased, and the purpose of improving the production efficiency of film forming is achieved.

The invention provides a multi-element co-doped electromagnetic shielding functional material, a polyester master batch as well as a preparation method and application of the polyester master batch. The functional material is prepared from a nanoscale hexagonal ferrite composite material, a cobalt ferrite material and a cobalt-nickel bimetallic nano porous carbon material in a mass ratio of (3-5): (3-5): (1-2). The electromagnetic (EM) absorption performance of the material is greatly improved by finely regulating and controlling the particle size and morphology characteristics of the synthetic filler particles, and feasible theoretical and data support is provided for optimizing the performance of the electromagnetic shielding material, so that the application and development of the electromagnetic shielding material in wider fields are promoted.