43results about How to "Achieve ultra-fine" patented technology

The present invention involves a manufacturing method of a low -alloy steel plate. Specifically, it is a manufacturing method for the super fine crystal of low -alloy steel thick plates / extra thick plates; as follows: 1. Uniform heating plate blank 30-60min is released;2. Reduce the surface temperature of the middle blank at ≥10 ℃ / s to 350-550 ° C, wait for the return of red; 3. When the temperature of the surface layer of the middle blank is red to 850-960 ° C, multiple secondary rolling is performed.During the secondary track, the surface temperature of the board is quickly reduced to below AR1 at 10 ~ 80 ° C / s. After waiting for the return to red, the next rolling temperature is 780 ~ 850 ° C;20 ° C / s Fast cooling board blank, wait for the return of red to 250-400 ° C after returning to red, and stack cold; this method does not significantly increase the existing rolling load, make full use of the accumulated storage energy in the middle of the thick steel plate, control multiple times many times, and repeatedly control it.Cold the rolling and control the surface of the surface of the surface of the surface.

The invention discloses a preparation method of an efficient and environment-friendly composite fire retardant, which comprises the following steps: modifying attapulgite to obtain nano attapulgite; and using the nano attapulgite as a substrate, coating a proper amount of inorganic fire retardant and phosphate fire retardant on the surface so as to form the efficient and environment-friendly composite fire retardant. By using the preparation method, the obtained fire retardant can be superfine, and the influence of the fire retardant on the processability and the physical properties of the high molecular substrate material can be weakened. At the same time, by the fire retardant property of the nano attapulgite and the synergetic effect of multiple fire retardants, the fire retardant efficiency is enhanced, the industrial cost of the fire retardant is lowered and a new way is provided for the development and the application of attapulgite.

The invention relates to a preparation method of a porous metal oxide, which belongs to the intersection field of metal powder technology and metal material surface treatment. The preparation method is as follows: degumming the short carbon fibers first, then passing the degummed short carbon fibers and metal powder through a proper ball milling process to obtain metal powder embedded with ultrafine carbon particles, and then sintering in a protective atmosphere or vacuum after pressing. Or direct loose-pack sintering, and finally perform short-term annealing in oxygen-containing air. While removing carbon particles in the metal powder, the surface of the metal particles is partially oxidized to obtain a porous metal with a partially oxidized surface. The porous metal oxide prepared by the invention exhibits good properties of oil storage, hydrogen storage, paraffin wax storage, lithium storage, and catalytic performance, and the preparation process is simple and the cost is low.

This invention relates to alloying and heat treatment craft of tool die steel, it belongs to one kind of DM8B-2 multi-types superfine carbide high carbon alloy tool steel. Using alloy design method which voluntarily developing, do the phase equilibrium thermo dynamics, electronic / atom level binding energy computation,quenching and the tempered hardness computation as well as to synthesis appraisal its toughness and sintensity. Its ingredient characteristic is appropriate C quantity and Cr / (W+Mo) ratio, reasonable Si, Mn as well as few Ni; Its microstructure characteristic has the superfine carbide, annealing carbide size is between 0.05-0.8mum, when quenching, the undissolved carbide size should not to be smaller than 0.5mum. after quenching to add 200degree C-300degree C, tempering may enable the tempering hardness to achieve 61-64HRC by using carbide precipitation hardening. It has high yield strength and the impact toughness.In the thin edge cutting tool, cutting die and weightily attacking die areas, it has widespread application prospect.

The invention discloses a novel centrifugal melt electrostatic spinning device. The device mainly comprises a spinning component, a receiving component, an electromagnetic heating component, a high voltage generating component, a power-driven component and a rack. The spinning component comprises a liquid storage tank, an end cover, first circular cone frustum spray head assemblies and second circular cone frustum spray head assemblies. The receiving component comprises a plastic bottom plate made of nylon and an aluminum receiving plate which can slide on the plastic bottom plate through bolt adjusting, wherein a groove is formed in the plastic bottom plate. The electromagnetic heating component comprises an electromagnetic coil, an electromagnetic control box, an infrared thermometer and supporting rods. The electromagnetic coil is located at the lower end of the liquid storage tank. The high voltage generating component comprises a high voltage generator, wherein a positive electrode of the high voltage generation is connected with the static receiving plate of the receiving component. The power-driven component comprises a motor and a shaft, the shaft is driven by the motor to rotate so as to drive the liquid storage tank to rotate. The rack is grounded and supports the whole spinning system. Centrifugal force is introduced into a traditional melt electrostatic spinning device, by the utilization of dual functions of electrostatic force and centrifugal force, fibers are stretched and refined, and finally nanometer fibers are manufactured in order in batch.

The invention relates to a preparation method of superfine modified kaolin, which is characterized in that the preparation method comprises the following steps that (1), kaolin powder and carbamide are uniformly mixed in an open container, and fully absorb moisture in air to form a mixture; (2), the mixture is heated, and reacts at 70-120 DEG C; a kaolin-carbamide intercalation compound is prepared; an intercalation rate is 80%-98%; (3), the compound is placed into a ball mill; a certain amount of dispersing agent and water is added; wet grinding is conducted; the content of ground kaolin with a particle size less than 2 micrometers is above 90%; a kaolin mud cake is obtained through suction filtration and dehydration; (4) a certain amount of silane coupling agent and water is added into the kaolin mud cake, and stirred at 50-80 DEG C; a coupling reaction happens; the modification is achieved; and (5) the modified kaolin is dried, and the finished superfine modified kaolin is prepared. According to the preparation method, the intercalation rate is high; the influence on a crystal structure of the kaolin is small; a peeling effect is good; and the prepared superfine modified kaolin is particularly applicable to rubber and plastic materials and oil paint.

The invention relates to a porous metal oxide particle and a preparation method thereof and belongs to the technical field of metal powder. The preparation method of the porous metal oxide particle comprises degumming short carbon fiber, performing an appropriate ball-milling process on the degummed short carbon fiber and metal powder to obtain ultrafine carbon particle embedded metal powder; performing annealing treatment in an oxidizing atmosphere to obtain surface oxidation controllable porous metal powder. The prepared porous metal oxide particle is high in oil storage, hydrogen storage, paraffin storage and lithium storage performance as well as catalytic performance; meanwhile, the preparation method of the porous metal oxide particle is simple in process and low in cost.

The invention discloses a high-dispersion composite modified ground calcium carbonate and a preparation method thereof, belonging to the technical field of powder modification. The method of the invention is as follows: firstly, the heavy calcium carbonate is put into an oven to be dehydrated at 100-110 DEG C, and then the heavy calcium carbonate and the polymethyl methacrylate emulsion are mixed with an electric mixer, and the polymethyl methacrylate emulsion is mixed. The dosage is 2.0% to 4.0% of the mass of heavy calcium carbonate, and then a secondary modifier (such as any one of stearic acid, titanate, and sodium tripolyphosphate) is added, and the mixture is stirred electrically for 40 minutes at 80 to 85°C. ~120min to obtain highly dispersed modified ground calcium carbonate powder. The modified ground calcium carbonate prepared by the invention has good dispersibility, the surface zeta potential is greater than 29.8mV, the average particle size is less than 500nm, the activation rate is greater than 90.8%, and the oil absorption value is less than 0.30ml / g. The high-dispersion modified heavy calcium carbonate powder prepared by the invention is mainly characterized in that it has high dispersibility and high activation rate, and can be used in the field of polymer composite materials.

The invention provides an ECAE (equal channel angular extrusion) based preparation method of an ultrafine crystal NiTi shape memory alloy tube. A metal core is inserted into a NiTi shape memory alloy tube blank to be shaped, then the NiTi shape memory alloy tube blank is enclosed in a metal covering, and the metal covering, the NiTi shape memory alloy tube blank and the metal core are simultaneously extruded to generate shear plastic deformation in an ECAE production tool consisting of male die and a female die, so as to realize grain refinement of the NiTi shape memory alloy tube blank. Based on the fundamental of the ECAE method, a preparation method of an ultrafine crystal NiTi shape memory alloy tube is provided by the invention, so that high quality ultrafine crystal NiTi shape memory alloy tube can be produced, and production costs of the ultrafine crystal NiTi shape memory alloy tube can be reduced substantially.

The invention relates to a wet grinding machine for industrial treatment of concrete admixtures. An embedded component is connected onto a tube body; the embedded component is fixed on a reinforced concrete column; power equipment is connected onto a rotating shaft, and the lower part is born by a bearing component; the bearing component is provided with a wear-resistant steel ball horizontal round groove; the bearing component is firmly connected with a basic concrete structure; the rotating shaft is connected with a stirring disc through a connecting key; a feeding opening is formed in the upper side of the tube body; a discharging opening is formed in the lower side of the tube body, and consists of a movable baffle plate and a grille outside the movable baffle plate; a cooling water jacket is arranged outside the tube body; a cooling guide pipe is arranged in the tube body, and is connected with the cooling water jacket; medium grinding balls are arranged in the tube body. The stirring disc is driven through the rotating shaft and the power equipment fixed at the upper part of the support frame; the stirring disc drives materials and the medium grinding balls to generate collision, friction, shearing and extrusion, so that materials are finely ground. The wet grinding machine has the advantages that the mechanical structure and the heat radiation principle are utilized; the material wet grinding disposal superfining is realized; the treatment quantity is great; the resource waste is reduced; the cyclic utilization of solid wastes is realized.