25 results about "Sintering" patented technology

The invention relates to a surface coating modified lithium ion battery cathode material and a preparation method thereof. The surface coating modified lithium ion battery cathode material has a general chemical formula of LiNi<1-a-b>CoaAlbO2/M, wherein a is more than 0.1 and less than 0.3, b is more than 0.01 and less than 0.2, and M refers to a coating layer. The material is coated by adopting a dry method; the coating layer refers to one or a mixture of two of lithium iron phosphate and lithium ferric manganese phosphate; and the mass ratio of the coating layer to LiNi<1-a-b>CoaAlbO2 is (0.01-0.2):1. The surface coating modified lithium ion battery cathode material and the preparation method thereof disclosed by the invention have the advantages that the stability of the cathode material is improved, and the safety performance of the material is improved; and moreover, in the dry-method coating process, waste liquor is not produced, high-temperature sintering is not needed, and the energy consumption and cost can be reduced.

A method for preparing a silicon carbide ceramic material with low residual silicon by adopting a multi-step reaction sintering method comprises steps as follows: carbon sources are selected, the carbon sources with different activity degrees are mixed with silicon carbide powder, phenolic resin or PVA (polyvinyl acetate) is added, the materials are mixed and subjected to powder forming, siliconizing sintering and heat treatment for removing residual silicon, finally, an obtained silicon carbide product is polished, carbon and silicon condensed on the surface are removed, the coarse surface is flattened, and a qualified silicon carbide finished product is obtained. According to the method, the problem that application of a conventional reaction sintered silicon carbide ceramic material in high temperature and corrosion environments and a high temperature difference environment is limited due to higher content of residual silicon is solved, the silicon carbide ceramic material with low residual silicon and high density can be prepared, heat-conducting property, high-temperature mechanical property, Young modulus, corrosion resistance, high-temperature conductivity and other properties of the reaction sintered silicon carbide material are greatly improved, and the application range of the reaction sintered silicon carbide material is greatly enlarged.

The bismuth sodium titanate-barium titanate base piezoelectric ceramic contains bismuth oxide, sodium carbonate, barium carbonate, titania and tin oxide, and has the chemical composition of (1-x)[(Na0.5Bi0.5)TiO3]-xBaTiO3-ySnO2, where x is 0-0.1, and y is 0-0.1. The preparation process of the bismuth sodium titanate-barium titanate base piezoelectric ceramic includes material compounding, vibration milling to mix, pressing block, pre-sintering, adding adhesive, rolling, eliminating glue, sintering, silver sintering and final polarizing in silicon oil. The present invention has effectively lowered coercive field and resistivity of the piezoelectric ceramic and simple and feasible polarizing process, and the technological process may be used in preparing various kinds of lead-free piezoelectric ceramic of different piezoelectric and dielectric performances for need of different fields.

The invention discloses a saw-type sintering metal base diamond saw blade for cutting a QFN (Quad Flat Non-leaded) package substrate, which comprises diamond abrasive particles and metal matrix. The metal matrix comprises metal powder and inorganic filler, wherein the metal powder consists of Cu powder, or CuSn20 prealloying powder, Sn powder and Co powder, and the inorganic filler consists of SiC and Al2O3; two series of metal matrix which take Cu and Co as bases are formed according to high-content elements. The qualified metal base diamond saw blade is prepared by the following steps of: firstly, preparing the components of the matrix of the metal base diamond saw blade; and then evenly mixing all the metal powders and the inorganic filler, and then mixing with the diamond abrasive particles; carrying out cold-pressed performing, and then carrying hot-pressed sintering to prepare a metal base diamond saw blade blank; and finally carrying out precision finishing, such as internal and external circle cutting, thickness reducing and the like. The saw-type sintering metal base diamond saw blade has the advantages of high strength and good abrasion resistance, and has the characteristics of high processing efficiency and long service life on the premise of satisfying the quality requirement of on-line chip cutting.

The invention discloses an unleaded piezoelectric ceramic consisting of a B-site composite Bi-based compound and a preparation method thereof. The components of the unleaded piezoelectric ceramic are shown by the general formulae of (1-x) Bi (Li1/2Me1/2) O3 - xBaTiO3 + zMaOb, (1-x) Bi (Li1/2Me1/2)O3 - x (Na1/2Bi1/2)TiO3 + zMaOb, (1-x-y) Bi (Li1/2Me1/2) O3 - xBaTiO3 - y (Na1/2Bi1/2) TiO3 + zMaOb, (1-x-y) Bi (Li1/2Me1/2) O3 - xBaTiO3 - y (K1/2Bi1/2) TiO3, + zMaOb or (1-x-y-v) Bi (Li1/2Me1/2) O3 - xBaTiO3 - y (Na1/2Bi1/2) TiO3 - v(K1/2Bi1/2) TiO3 + zMaOb, wherein x, y, z and v denote mole fractions, 0 (x (1.0,0 (y (1,0 (v (1, 0</= z</=0.1, Me represents one or five pentavalent metallic elements, MaOb represents one or a plurality of oxides, M is an element of +1 to +6 valence, and can be formed into a solid oxide with oxygen, and the ceramic is prepared in a conventional ceramic preparation method. The prepared unleaded piezoelectric ceramic has a good sintering characteristic, the preparation process is simple and stable, the performance is excellent, and the unleaded piezoelectric ceramic can partially replace the conventional lead based piezoelectric ceramic to be used.

The invention discloses a composite high-magnesia flux for sintering, which is prepared by compounding two fluxes containing magnesium, namely magnesium limestone powder and serpentine according to certain weight proportion, wherein the mixture ratio of the magnesium limestone powder in a sintered mixture is between 1 and 2.5 percent, the mixture ratio of the serpentine in the sintered mixture is between 0.5 and 2 percent, and the proportion between the magnesium limestone powder and the serpentine can be properly adjusted within the mixture ratio range according to conditions of sintered raw materials and concrete requirements of an iron-making blast furnace on the MgO content in sintered ore. The flux radically avoids the negative effect on the iron-making blast furnace caused by lower MgO content in imported fine ore; the flux eliminates the disadvantageous situation of constituent fluctuation of the sintered ore caused by adding a MgO flux during the sintering, and realizes the dual aims of improving the quality of the sintered ore and reducing the cost for the flux; and the flux greatly reduces the using amount of calcium oxide, makes white spot phenomenon in the mixture basically disappear, apparently lightens the phenomena of sticking and blocking of a mixing machine and a storage hopper, and has steadier and smoother sintering process.

A composite desulfurizing agent for iron and steel is prepared from calcium carbonate (10-45 wt.%), fluorspar (2-10 wt.%), lime (10-45 wt.%), carbon-bearing substance (0-10 wt.%) and assistant through low-temp sintering and mixing. Its advantages are high desulfurizing speed and effect and low cost.

The invention relates to the technical field of batteries, in particular to a lithium-rich anode material and a preparation method thereof. The preparation method comprises special steps: dissolvable Ni slat, Co salt, Mn salt and Li salt are firstly dissolved in an appropriate amount of organic alcohol solution according to a stoichiometric ratio, and a metal salt solution with a certain concentration is prepared; then, oxalic acid is dissolved in the organic alcohol solution, and an oxalate solution with a certain concentration is prepared; then, the metal salt solution and the oxalate solution are mixed to form a co-precipitation solution, the co-precipitation solution is aged, filtered and dried, so that a precipitate precursor is obtained; finally, the precursor is subjected to high temperature sintering, and the lithium-rich anode material xLi2MnO3.(1-x)LiMO2 (M is Co, Mn, Ni, Ni1/2Mn1/2, or Ni1/3Co1/3Mn1/3) is obtained. The preparation cost of the method is lower, and the shape and the size of the lithium-rich anode material are easier to control.

The invention discloses a method for repairing a ternary positive electrode material with deteriorated performance and the acquired ternary positive electrode material. The material repairing method comprises the steps that a repairing agent is dispersed in an organic solvent; after ultrasonic dispersion, the ternary positive electrode material with deteriorated performance under a state of continuous stirring is added; and the repaired ternary positive electrode material is acquired after filtering and high temperature sintering. The interface of the ternary material can be adjusted by adjusting the amount of the repairing agent and other parameters. At the same time, the repairing agent can react with residual lithium on the surface of the material to form a stable compound, which is beneficial to reducing the residual lithium on the surface of the material and can significantly restore the material performance. According to the invention, the previous technical ideas of preventing performance degradation or deterioration of the ternary positive electrode material of a lithium battery is broken; the material which is degraded and deteriorated is remedially treated; and the problems which are not effectively solved during the preparation, transportation and storage of the ternary positive electrode material are solved.

The invention relates to the modification of cast stone. The cast stone is modified and prepared into a wear-resistant composite microcrystalline sheet material by the addition of some raw materials. The wear-resistant composite microcrystalline sheet material is concretely prepared by the following steps of: uniformly mixing natural basalt, quartz sand, feldspar, changbaiite, boron nitride and molybdenum disulfide according to a certain weight ratio, heating the mixture into a crystallization tank furnace for crystallization, fully melting, followed by water quenching to prepare crystallized pellet diet; placing the pellet diet into a thermal furnace for heating, softening, melting, laying flat to obtain a smooth and flattening sheet material, preparing into a polycrystalline sintered body with a hard microscopic structure, cooling by annealing, grinding, polishing, and cutting into the required specification. The invention relates to a high-strength, high wear-resistant and corrosion-resistant protective material. Due to the adoption of natural inorganic materials, the novel green environmental-protection wear-resistant composite microcrystalline sheet material, which is prepared by two-time high-temperature sintering, is characterized in that its wear resistance can be more than ten times than that of common carbon steel, the microcrystalline sheet material has strong wear-resistant performance; and its use cost is low.

The invention relates to an ultra-thin mask type plasma display screen which comprises a front substrate (2), a back substrate (1) and a mask(3) with a grid hole (10) array clamped between the front and the back substrates and used for supporting the front and the back substrates. In the invention, the thicknesses of a front and a back glass substrates and the front and back substrates are small, and the weight thereof is light. The front and the back glass substrates and the front and back substrates are flexible. Thin glass serves as a medium layer, so that no medium layer needs to be manufactured at the high temperature, thereby simplifying the manufacturing process, and reducing the production cost. The ultra-thin mask type plasma display screen has the advantages of reducing sintering process at the high temperature, reducing the weight of the plasma display screen, reducing the production cost and enabling the plasma display screen to have the flexibility.

The invention relates to a composite heat-conductive material and a preparation method thereof. The composite heat-conductive material comprises a polymer matrix and carbon nanofiber cloth which is embedded inside the polymer matrix, wherein the carbon nanofiber cloth is arranged perpendicular to the extension direction of the composite heat-conductive material, and is of a wave shape, and the carbon nanofiber cloth is obtained through calcination of an electrospinning film. The carbon nanofiber which is prepared from the electrospinning are combined with metal nanoparticles, a simple low-temperature sintering process is performed so as to form coated carbon nanofiber, a crosslinked heat-conductive skeleton is formed by the carbon nanofiber together with the metal nanoparticles, and the high-heat-conductive material is prepared through compounding of the coated carbon nanofiber with the polymer matrix.

Ultrawhite stoneware is disclosed. The ultrawhite stoneware comprises, by weight, 25% of aedelforsite, 10% of potassium sand, 15% of aluminous soil, 5% of kaolin, 21% of potash feldspar, 21% of albite and 3% of talcum. The production process of the stoneware includes steps of: 1) ball milling, 2) performing spray granulation, 3) feeding into a powder storage bin, 4) performing compression moulding, 5) sintering and 6) examining. Beneficial effects of the ultrawhite stoneware and the production process are that: the whiteness of the product is higher than 53 degrees, and the product is free of chemical raw materials harmful to human health such as zirconium silicate so that the product is free of a problem of radioactivity exceeding the standards. The formula structure of the product is formed by low-temperature quick sintering, thus largely saving energy consumption.

The invention relates to rare-earth-doped nitrogen oxide green fluorescent powder and a preparation method thereof. The nitrogen oxide green fluorescent powder has the chemical formula of Ba1-yLnxAl2-x-zSizO4-zNz: yEu<2+> (Ln is Y, La, Gd, Lu). The preparation method comprises the following steps: according to the stoichiometric ratio of the chemical formula, weighting raw materials, namely elementary substances, oxide or the corresponding salts of Si, Al, Ba and Ln (Ln is Eu, Y, La, Gd, Lu) and adding a fluxing agent; fully grinding, placing the powder into a sintering furnace and carrying out primary high-temperature roasting and secondary reduction sintering and then post treatment to obtain the final product, nitrogen oxide green fluorescent powder. By virtue of doping rare earth ions and adding the fluxing agent, the preparation conditions and light-emitting effect are improved, the nitrogen oxide green fluorescent powder is simple to prepare, free of pollution and low in cost, has strong excitation peaks from an ultraviolet region to a blue region, can emit bright green light under the excitation action of ultraviolet and blue lights and has potential application values on lighting and display aspects.

The invention discloses an electrode cylinder, which comprises a cylindrical cylinder body with open upper and lower sides. The inner surface of the cylinder body is uniformly provided with multiple ribs in a radial direction; the ribs extend towards the central axis direction of the cylinder body; one end of the rib is flush with the cylinder body and the other end protrudes against the cylinderbody; the rib is vertically provided with a row of multiple heat conduction holes; the ratio of the diameter of a heat conduction hole to the width of a rib is between 0.45 to 0.60; the ratio of a hole distance between adjacent heat conduction holes to the diameter of a heat conduction hole is between 1.6 to 1.65; and the distance between the top heat conduction hole and the top end of the rib andthe distance between the bottom heat conduction hole and the bottom end of the rib are both smaller than the diameter of a heat conduction hole. The heat conduction holes in the rib are arranged reasonably, the electrode sintering quality is better, the strength is higher, and accidents such as suspended paste before electrode sintering, head and block falling of the electrode, over slow electrode baking, soft and hard breaking of the electrode can be effectively solved.

The invention discloses an in-situ synthesized Cr3C2 reinforced Ni-based composite material and a hot-press preparation method thereof. Cr2AlC (10-40 vol%) ceramic powder and Ni powder are used as rawmaterials. Under high temperature environment, Cr2AlC dissociates, Al atoms diffuse with part of Cr atoms, in-situ synthesized Cr3C2 ceramic particles are evenly distributed in a matrix, meanwhile, Cr atoms and Al atoms are dissolved in a Ni matrix to form gamma-Ni, and when Cr, Al reaches a certain amount, a precipitated phase Ni3(Al,Cr), that is, a gamma'phase is precipitated out. The masses ofthe Cr2AlC powder and the Ni powder are calculated and weighed, after ball milling and mixing, the Cr2AlC powder and the Ni powder are poured into a hot-press mold for hot-pressing sintering, the sintering temperature is 1,200-1,400 DEG C, 25MPa pressure is applied when the temperature is 1,100-1,200 DEG C, the insulation and pressure maintaining is performed for 30min, pressure relief is performed after the temperature is lowered to 500-600 DEG C due to furnace cooling, a sample is taken up when the temperature is lowered to below 80 DEG C, and the in-situ synthesized Cr3C2 reinforced Ni-based composite material is obtained. The material has comprehensive properties such as high strength, high hardness, wear resistance, corrosion resistance and good high temperature performance, and canbe applied to aerospace, military industry, transportation and other fields.

The invention relates to a preparation method of a metal film of a gradient aperture structure. The preparation method comprises the following steps of 1, uniformly stirring small-particle-size metal powder and a binder solution to prepare slurry; 2, uniformly coating a smooth flat plate with the slurry, drying, stripping a metal film blank from the flat plate, and rolling the obtained metal film blank into a cylindrical shape to be tightly attached to the inner wall of a rigid outer mold; 3, filling a cavity between the rigid outer mold and an elastic inner mold with metal powder with different thicknesses, sealing the two ends of the cavity with elastic sealing heads, and removing the elastic inner mold and the elastic sealing heads after cold isostatic pressing; and 4, placing the rigid outer mold and a blank body in an atmosphere furnace for high-temperature sintering, cooling, and removing the rigid outer mold to obtain the asymmetric metal film. The process is simple, the cost is low, and the prepared metal film is large in aperture gradient, large in flux and high in filtering precision.

The present invention relates to a precise filter, which comprises a filter cover and a filter base. A lug boss is arranged on the filter cover, and the filter cover and the filter base are communicated. The filter base is provided with external threads and a round screw nut is arranged between the filter cover and the filter base. A filter element made of macromolecule sintering polyfluortetraethylene is arranged between the filter cover and the filter base. Because the filter element is made of the macromolecule sintering polyfluortetraethylene, the filtering effect is better. The filter base is fixed on a permanent plate through a bolt, so that in disassembly and assembly processes, the precise filter is more convenient to use.

The invention discloses a high-temperature-resisting knuckle bearing for an actuator and belongs to the technical field of structural design. The knuckle bearing is composed of a rod end shaft sleeve and a shaft core. The shaft core is formed by a mesh-shaped alloy framework and ceramic powder through a high-temperature sintering process. The whole knuckle bearing is formed in a process channel of the shaft core embedding rod end shaft sleeve. The mesh-shaped alloy framework is formed by welding high-temperature alloy wires of different diameters or formed through 3D printing, the ceramic powder is hafnium carbide or zirconium carbide or tantalum carbide, the ceramic powder and the mesh-shaped alloy framework are evenly and densely combined, and the whole shaft core is formed. According to the high-temperature-resisting knuckle bearing for the actuator, the stress strength of the knuckle bearing in work can be guaranteed while thermal transmission in the working state is prevented, and the service life of the knuckle bearing can be prolonged.

The invention discloses a polyimide based insulation friction material and a preparation method of the friction material. The material comprises 65.5-76% of polyimide, 5-20% of glass fiber, 5-15% of polytetrafluoroethylene, 0.5-3% of silicon dioxide and 3-9% of para-polyphenol. The preparation method comprises the steps of dispersing the raw materials in an organic solvent uniformly stirring to form powder, and then performing hot pressed sintering on the powder. The material has the significant advantages that the polyimide based material has a stable friction coefficient, a lower wear rate and strong mechanical properties under a complete insulation condition; a service life of an ultrasound motor is effectively prolonged; the reliability of the ultrasound motor is effectively improved;the material can meet use requirements in special environments such as high and low temperature and high load; at the same time, the material can be prepared and formed by a typical hot pressed sintering method during preparation; a technology is simple and reliable; and the cost is low.

The invention discloses a novel anti-electrostatic ceramic glaze as well as a preparation method and the application thereof. The preparation method comprises the following steps: carrying out continuous microwave synthesis on a common ceramic transparent glaze which mainly consists of ore materials at a temperature of 1100-1300 DEG C which is kept for 20-30 minutes, melting, directly pouring intowater for cold quenching, grinding prepared melt blocks in a ball milling tank, screening till 400 meshes so as to obtain a melt block powder, further mixing with a screened aluminum-doped zinc oxideconductive powder with150-200 meshes in a mass ratio of 20-30%, carrying out uniform ball milling mixing with 60% deionized water, at the same time adding sodium carboxymethylcellulose to regulate properties of a glaze material, so as to obtain glaze slurry, wherein the prepared glaze slurry is aged and applied to a dry ceramic blank by using a glazing method, and the glaze soaking time is 3 seconds. The ceramic blank after glaze application is dried in a drying tank, and is sintered by using a microwave continuous sintering process. The obtained ceramic glaze has the advantages of being smooth and flat in glaze surface, free of bubbles, transparent, good in chemical stability, non-toxic and environmental-friendly, low in price, and the like.

The invention discloses a two-step sintering preparation method of doped bismuth ferrite-barium titanate-based leadless piezoelectric ceramic, and belongs to the field of leadless piezoelectric ceramic materials. The preparation method comprises the following steps: calculating and weighing according to a chemical formula (1-x) Bi < 1-y > M < y > Fe < 1-z > N < z > O < 3-x > BaTiO3, ball-milling and mixing, drying, sieving, putting into an aluminum oxide crucible, and pre-sintering at 780-950 DEG C for 2-12 hours to obtain pre-sintered powder; performing secondary ball milling, drying at 70-120 DEG C, sieving dried powder, adding 2wt% of polyvinyl alcohol, fully grinding and granulating, and putting the granulated powder into a mold for compression molding; and putting the ceramic blank into a muffle furnace, heating to 300-440 DEG C, discharging glue for 1-2 hours, heating to 950-1050 DEG C, preserving heat for 1-2 minutes, cooling to 900-1000 DEG C, sintering for 6-10 hours, and cooling to room temperature along with the furnace to prepare the required ceramic. According to the two-step sintering method, by ingeniously controlling the two-step sintering temperature and the heat preservation time, the generation temperature interval of an impure phase in the bismuth ferrite-barium titanate-based ceramic can be avoided, and the prepared ceramic is good in crystallinity, uniform in component, small in crystal grain, low in dielectric loss and excellent in insulativity and piezoelectric property.

The invention discloses a novel electrode material of a supercapacitor, wherein the novel electrode material of the supercapacitor is carbon carbide material/graphene oxide/chitosan. Polypyrrole composite is a kind of carbon/graphene oxide/chitosan composite under protective atmosphere. Polypyrrole composites are prepared by sintering and carbonization, and the carbonization temperature is 800 DEGC-900 DEG C. The supercapacitor of the invention comprises a supercapacitor, a connecting ring is slidably connected on the side wall of the supercapacitor, and the connecting ring can directly mountthe supercapacitors connected together on a circuit board for welding, the welding is more convenient, and the connecting ring can rotate. A long chain of that chitosan and the polypyrrole molecule are uniformly disper and loaded on graphene oxide and carbon material to form a three-dimensional open pore structure, which is favorable for the charged particles to diffuse to the electrode interface, has good cycle performance, wide work range, fast charging and the like, and has the advantages of larger specific surface area and more active sites.