37results about How to "Uniform and dense grain" patented technology

The invention provides a high-frequency low-loss MnZn ferrite material, which comprises main components and auxiliary components, wherein the main components are 53-56 mol percent of ferric oxide, 34-41 mol percent of manganese oxide and 6-10 mol percent of zinc oxide, the content of manganese oxide is measured by Mn; the auxiliary components are at least three selected from CaCO3, SiO2, Nb2O5, CoO, V2O5, SnO2 and TiO2, and based on the total weight of the main components, the auxiliary components comprise: 0.02-0.08 weight percent of CaCO3, 0.002-0.01 weight percent of SiO2, 0.02-0.06 weight percent of Nb2O5, 0.03-0.20 weight percent of CoO, 0.01-0.05 weight percent of V2O5, 0-0.20 weight percent of SnO2 and 0-0.10 weight percent of TiO2. The invention also provides a manufacturing method of the high-frequency low-loss MnZn ferrite material.

The present invention relates to wide-temperature ultra-low-loss MnZn soft magnetic ferrite material and method for manufacturing, and belongs to electronic material technology field. The main constituent is calculated by oxide with molar percentage: 65-75mol%Fe2O3, 13-20mol%ZnO, 0.0001-0.5mol%TiO2, allowance being Mn3O4; weight percentage of doping agent: 0.01-0.1wt%CaO, 0.01-0.09wt%Nb2O5, 0.01-0.1wt%V2O5, 0.001-0.1wt%ZrO2, and 0.05-1wt%Co2O3. Grain of wide-temperature ultra-low-loss MnZn soft magnetic ferrite material of the invention is uniform and dense, and average grain dimension is about 12-18Mum.

The invention relates to the technical field of magnetic materials, and discloses a method for preparing a rare-earth-doped manganese-zinc ferrite material, comprising the steps of adding manganese oxide, zinc oxide and iron oxide as main components to a ball mill and conducting ball milling to obtain a mixture A; pre-firing the mixture A, and then conducting cooling to room temperature to obtaina pre-fired material; adding the pre-sintered material, vanadium oxide, niobium oxide, bismuth trioxide, molybdenum oxide, phosphorus pentoxide, copper oxide and a composite rare earth additive into aball mill, and conducting secondary ball milling and drying to obtain a mixture B, wherein the composite rare earth additive is composed of cerium oxide, yttrium oxide and lanthanum oxide; adding a polyvinyl alcohol solution to the mixture B, conducting mixing and granulation, and then conducting sieving by a sieve of 40-80 mesh, so as to obtain pellets; adding the pellets into a molding machinefor pressing, so as to obtain a blank; and sintering the blank and conducting cooling. The rare-earth-doped manganese-zinc ferrite material prepared by the method of the invention has high initial magnetic conductivity and saturation magnetic flux density.

The invention relates to a ternary ferroelectric solid solution lead niobate ytterbate-lead zinc niobate-lead titanate. The chemical formula of the solid solution is xPb(Yb1/2Nb1/2)O3-yPb(Zn1/3Nb2/3)O3-(1-x-y)PbTiO3, wherein x is more than 0 and less than 1, and y is more than 0 and less than 1, and the solid solution belongs to a typical composite perovskite structure. The system is good in piezoelectric and electromechanical performance, high in Curie temperature and good in thermal stability, and has a wide application prospect.

The invention discloses a special-shaped cable and a preparation method thereof. The conductive core of the special-shaped cable is composed of at least two conductive core segments in an end-to-end way, wherein the cross sections of the conductive core segments are different in shape. The conductive core segments are externally wrapped by an insulating layer. The contour of the insulating layer is fit with the conductive core segments. The cable has great bending performance and can also be greatly fit with a vehicle body so that consumables can be saved and the safety performance can be greatly enhanced. The cable is made of the aluminum or aluminum alloy conductive cores so that the vehicle body is enabled to be light-weighted, and the production cost of the motor vehicle can be reduced. The preparation method of the special-shaped cable comprises the steps of manufacturing the conductive core segments, connection of the conductive core segments and manufacturing of the insulating layer so that the production efficiency and the productivity can be effectively enhanced according to different production requirements and the production cost can be reduced.

The invention discloses a high-volume diamond reinforced metal-based composite material and a preparation method and application thereof. The high-volume diamond reinforced metal-based composite material comprises a gradient boron-doped diamond reinforced metal-based composite material and a diamond layer strengthening phase, wherein the diamond layer strengthening phase coats the surface of the gradient boron-doped diamond reinforced metal-based composite material; the gradient boron-doped diamond reinforced metal-based composite material comprises a gradient boron-doped diamond reinforcementbody and a metal matrix; and the gradient boron-doped diamond reinforcement body comprises an undoped diamond reinforcement body and a gradient boron-doped diamond modified layer arranged on the surface of the diamond reinforcement body. According to the material, the preparation method and application thereof, the thermal conductivity is greatly improved by increasing the volume of diamond in the composite material, and meanwhile, due to the fact that a pure diamond layer is uniform in hardness, the pure diamond layer is easier to machine, and is more conveniently applied to various fields.

The invention discloses a deep hole nickel electroplating plating solution, a preparation method and an electroplating method, and belongs to the technical field of nickel electroplating. The problemsthat in the prior art, nickel sulfate and nickel sulfamate based plating solution can not be used for deep hole plating are solved. The deep hole nickel electroplating plating solution comprises thenickel sulfate, nickel chloride, a boric acid, a dodecylbenzene sulfonic acid, sodium citrate, an ammonium sulfate, a hydroxypropyl pavement agent and a PS reagent; and the nickel electroplating plating solution comprises 200 - 300 g/L of the nickel sulfate, 30 - 50 g/L of the nickel chloride, 30 - 50 g/L of the boric acid, 0.006 - 0.10 g/L of the dodecylbenzene sulfonic acid, 50 - 90 g/L of the sodium citrate, 5 - 20 g/L of the ammonium sulfate, 0.11 - 1.10 ml/L of the hydroxypropyl pavement agent, and 0.001 - 0.10 g/L of the PS reagent. According to the deep hole nickel electroplating plating solution, the electroplating operation of the irregular deep hole in a battery shell is realized.

The invention discloses a hydrazine hydrate chemical nickel plating solution and a preparation method and nickel plating method of the hydrazine hydrate chemical nickel plating solution, and belongs to the technical field of chemical nickel plating. The problems that in the prior art, a sodium hypophosphite chemical nickel plating solution and the environment are damaged and polluted by the element phosphorus in the nickel plating solution, and the speed is low when hydrazine hydrate is adopted for chemical nickel plating are solved. The hydrazine hydrate chemical nickel plating solution is prepared from nickel sulfate, hydrazine hydrate, sodium citrate, potassium sodium tartrate, cobalt sulfate and lead acetate. The hydrazine hydrate chemical nickel plating solution and the preparation method and nickel plating method of the hydrazine hydrate chemical nickel plating solution are suitable for chemical nickel plating of matrix materials.

The invention relates to the technical field of equipment manufacturing industries, in particular to a machining method of a forge piece jaw base. According to the technical scheme, the method comprises the steps that A forging is carried out, wherein (1) blanking, (2) heat treatment, (3) prepressing, (4) forging and pressing, (5) pushing out and (6) cooling are included; and B turning is carried out. The method has the advantages that air holes, sand holes and damage caused by the holes are reduced; the mechanical property of metal is improved, and the internal structure of the metal is improved; labor productivity is improved; precision die forging is used, so the forge piece size is proper, and waste during cutting machining is lowered; and crystalline grains are relatively small, even, compact and suitable for following mechanical cutting machining, organization preparation is achieved for final heat treatment, and part using performance can be well improved.

The invention discloses a preparation method of Ni-B/B4C nano composite plating through pulse electrodeposition. The preparation method comprises the steps that S1, a steel sheet base body is pretreated; S2, an electroplating solution is prepared, wherein the electroplating solution comprises the following components according to the concentration: 240 g/L of nickel sulfate, 45 g/L of nickel chloride, 30 g/L of boric acid, 0.5 g/L of saccharin, 3 g/L of dimethylamine borane, 0.1 g/L of a surfactant and 1-5 g/L of B4C nano particles; S3, an electrodeposition process is conducted, specifically, the pretreated base body is put into the prepared electroplating solution to be subjected to electrodeposition; the technological parameters in the pulse electroplating process are as follows: the pulse frequency is 1000 Hz, the duty ratio is 40%, the time is 30 min, and the magnetic stirring rate is 400 rmp; and S4, after electrodeposition is finished, the surface of a plated part is subjected to ultrasonic cleaning through ethyl alcohol and pure water in sequence. The Ni-B/B4C nano composite plating prepared by the method has excellent corrosion resistance, higher microhardness and lower friction coefficient, and the comprehensive performance of the Ni-B/B4C nano-composite plating is remarkably improved.

The invention belongs to the field of chemical liquid phase deposition, particularly relates to a preparation method for a polycrystalline mercury iodide film seed crystal layer and solves the problems that the pollution of solvent and reaction by-products are difficult to remove during solution precipitation in the prior art. According to the preparation method for the polycrystalline mercury iodide film seed crystal layer, provided by the invention, yellow mercury oxide (HgO) and hydroiodic acid (HI) are used as basic materials, and the reaction rate between the HgO and (HI) is controlled by adjusting the concentration of the HI added into a system, so that fine mercury iodide particles are generated. The generated fine mercury iodide particles deposit on a substrate (electrode) material to form a layer of homogeneous film, so that directional crystal nucleuses are provided for gas phase epitaxial growth, thereby increasing one-way growth probability of the film.

The invention discloses a boron-doped diamond electrode with high conductivity, a long service life and a high specific surface area. The boron-doped diamond electrode is prepared by taking an etchedsubstrate as an electrode matrix; or arranging a transitional layer on the surface of the etched substrate as the electrode matrix and then arranging a boron-doped diamond layer on the surface of theelectrode matrix, wherein the boron-doped diamond layer comprises a boron-doped diamond bottom layer, a boron-doped diamond middle layer and a boron-doped diamond top layer with different boron contents; the boron-doped diamond bottom layer in contact with the matrix is taken as a conducting layer, the boron-doped diamond middle layer is taken as an anti-corrosive layer, the boron-doped diamond top layer is taken as a strong electro-catalytically active layer, the substrate is a composite material composed of a metal phase and a ceramic phase, and the metal phase is distributed continuously inthe composite material. The boron-doped diamond electrode has high conductivity, low residual stress, long service life and high specific surface area, and the degradation efficiency is improved greatly when being applied to degrading wastewater.

The general formula of the piezoelectric ceramic is Pb1-x-yLixCayTauu [(Ni, Zn) 1/3Nb2/3] v (Mg1/2W1/2) w (Ti, Zr) 1-u-v-wO3, 0.001 < = x < = 0.005, 0.001 < = y < = 0.005, 0 < = u < = 0.005, 0.01 < = v < = 0.05, and 0.01 < = w < = 0.05. PZT modified piezoelectric ceramic powder sintered at the low temperature of 850-950 DEG C is prepared by adopting a solid-phase reaction method, and then the ceramic material is prepared through the processes of granulation, tabletting, glue discharging, sintering, silver firing, polarization and the like. The result shows that the PZT modified ceramic material prepared at the sintering temperature of 850-950 DEG C is compact in crystal grain, uniform in crystal grain, sufficient in crystallization and obvious in liquid-phase sintering characteristic, and the piezoelectric property is greatly improved.

The general formula of the piezoelectric ceramic is Pb1xyLixCayTauu [(Ni, Zn) 1/3Nb2/3] v (Mg1/2W1/2) w (Ti, Zr) 1uvwO3, x is greater than or equal to 0.1 and less than or equal to 0.5, y is greater than or equal to 0.1 and less than or equal to 0.5, u is greater than or equal to 0.1 and less than or equal to 0.9, v is greater than or equal to 0.01 and less than or equal to 0.10, and w is greater than or equal to 0.01 and less than or equal to 0.10. PZT modified piezoelectric ceramic powder sintered at the low temperature of 850-950 DEG C is prepared by adopting a solid-phase reaction method, and then the ceramic material is prepared through the processes of granulation, tabletting, glue discharging, sintering, silver firing, polarization and the like. Results show that the PZT modified ceramic material prepared at the sintering temperature of 850-950 DEG C is compact in crystal grains, uniform in crystal grains, sufficient in crystallization and obvious in liquid-phase sintering characteristic, and the piezoelectric property is greatly improved.

The invention discloses a method for preparing PZN based multi-element composite perovskite type piezoelectric ceramics. In the preparation method, a precursor is synthesized by the following steps: weighing, mixing and grinding B-site ion oxides except ZrO2 and TiO2 in stoichiometric ratio; and finally cofiring to obtain the precursor. The method disclosed by the invention has an obvious advantage in preparation of PZN based three-element and multi-element composite perovskite type piezoelectric ceramics, and can effectively inhibit the formation of pyrochlore phase in the PZN based ceramic preparation process, thereby improving the PZN content of a solid solution and obtaining perovskite ceramics.

The invention discloses a method for preparing a lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst, and belongs to the technical field of photocatalyst preparation. The preparation method comprises the following steps of: (1) preparing lanthanum yttrium hafnate powder by adopting a conventional known method; (2) adding the lanthanum yttrium hafnate powder into titanium tetrachloride or titanium tetrafluoride solution, and dispersing the system into suspension by using ultrasonic wave; (3) placing the suspension in an electron beam generating device, and performing electron beam irradiation of certain dose, wherein the irradiation dose is 70 to 280KGy; (4) sealing the suspension, putting the sealed suspension in a baking oven, and reacting for 20 hours at the temperature of 60 DEG C; and (5) washing, drying and finally obtaining the lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst. The lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst prepared by the method has high photocatalysis activity by detection. Detected by a transmission electron microscope (TEM), nano titanium dioxide crystals are densely and uniformly loaded on a lanthanum yttrium hafnate matrix.