327 results about "Relative density" patented technology

An ultrafine grain cemented carbide additive manufacturing method. WC-Co is used as a raw material, a crystal grain growth inhibitor is added, and a rare earth oxide is added as a reinforcing phase; paraffin and a trace amount of low-valence rare earth oxide powder are added, ball milling is carried out for coating cemented carbide powder, and oxygen control is carried out; the cemented carbide powder obtained by ball milling and an organic adhesive are loaded in a vacuum banbury mixer-granulator to prepare a printing feed, then a green body is printed using fused deposition modeling (FDM), and finally, degreasing and two-step sintering are carried out on the green body to prepare ultrafine cemented carbide. By means of the combined effect of the components and process optimization design, the powder properties are regulated, the process range of vacuum banburying and granulation and additive manufacturing is widened, and the problems of pores, interlayer cracks, and oxygen absorption in a printed green body, and abnormal grain growth, oxidation decarburization, and the formation of brittle η-phase in a sintered sample are solved. The prepared ultrafine grain cemented carbide exhibits high relative density, is free of metallurgical defects, possesses excellent mechanical properties, and is suitable for large-scale and mass production.

The invention discloses a simulation test method for ceramic sintering stress and a method for reducing the ceramic sintering stress. The simulation test method comprises the following steps: 1, measuring the grain size, the relative density and the geometric size before and after sintering; 2, establishing a ceramic geometry by using Abaqus, and constructing a transient heat conduction model; 3, establishing a viscoelastic constitutive equation of sintering shrinkage deformation of the zirconia ceramic, and constructing a sintering shrinkage model; and 4, sequentially coupling the transient heat conduction model and the sintering shrinkage model, and implementing joint simulation of solid-phase sintering simulation to obtain a sintering stress simulation result of the ceramic. The method for reducing the ceramic sintering stress comprises the following steps: 5, establishing a ceramic sintering shrinkage finite element model with grain sizes distributed in proportion, and calculating average sintering stress distribution of the grain size proportion distribution model; and 6, comparing the average sintering stress of the sintering shrinkage models with different grain size proportions, and determining a method for reducing the sintering stress. The ceramic sintering quality and the production efficiency are improved.

The invention discloses die steel powder with high corrosion resistance. The die steel powder comprises the following chemical components in percentage by mass: 17.0%-18.5% of Ni, 8.0%-9.5% of Co, 4.5%-5.0% of Mo, 1.8%-2.5% of Cr, 0.4%-0.7% of Cu, 0.06%-0.12% of Y, 0.6%-0.9% of Ti, 0.06%-0.12% of Al and the balance of Fe. The invention further discloses a gas atomization preparation method of the high-corrosion-resistance die steel powder. The gas atomization preparation method comprises the following steps: (1) burdening and charging; (2) vacuumizing and gas replacement; (3) staged smelting: carrying out medium-frequency induction heating on the smelting crucible, raising the temperature to 1650-1720 DEG C at the speed of less than or equal to 10 DEG C / min, and keeping the temperature for 15 minutes after the matrix alloy is molten; adding high-purity elemental metals of Y, Ti and Al elements through a secondary feeding device 5-8 minutes before pouring is started, and realizing uniform diffusion of the elements by matching with argon covering and stirring; (4) argon atomization; and (5) powder post-treatment. According to the powder, the corrosion resistance is greatly improved by reasonably designing the components and the percentage thereof. According to the powder obtained through the gas atomization preparation method, the corrosion resistance is larger than or equal to 700 hours, the oxygen content is smaller than or equal to 50 ppm, the density is larger than 99.8%, and therefore the requirements of high-end optical molds are met.

The invention discloses a preparation method of low-temperature rapid densification silicon nitride ceramic based on an aluminum oxide-yttrium oxide composite sintering aid, and aims to solve the problems of high temperature, high energy consumption, difficult densification and the like in the existing Si3N4 ceramic preparation. The preparation method comprises the following steps: 1, mixing alpha-Si3N4 powder, Y2O3 powder and Al2O3 powder, and carrying out ball milling dispersion to obtain mixed powder; 2, carrying out rotary evaporation drying on the mixed powder under a vacuum condition; 3, carrying out heat preservation treatment under the conditions of 1600-1700 DEG C and 40-60 MPa through a spark plasma sintering process; and 4, demolding after cooling. Under the action of the Al2O3-Y2O3 composite sintering aid, phase transformation from alpha-Si3N4 to beta-Si3N4 is remarkably promoted, the relative density of the ceramic reaches 97%-99%, the fracture toughness of the ceramic is 5.21 MPa.m < 1 / 2 >, and the bending strength of the ceramic is 924.99 MPa.

The invention relates to a laser selective melting forming method for large-particle-size copper and copper alloy powder. The laser selective melting forming method comprises the steps of raw material powder laying and laser scanning. The granularity D of the raw material powder is more than or equal to 50 microns and less than or equal to 250 microns, D90 is more than or equal to 100 microns and less than or equal to 200 microns, and the powder paving thickness t is more than or equal to 0.5 D90 + A, and A is more than or equal to-10 microns and less than or equal to 10 microns; the laser scanning comprises first-time laser scanning and second-time laser scanning; through two times of laser scanning with different energy densities, an initial melting layer is firstly formed, and then a compact forming layer is obtained. The relative density of the target sample prepared through the method is larger than 99%, and compared with SLM forming with the conventional particle size in the prior art, the SLM technology forming cost is greatly reduced, the SLM forming efficiency is improved, and the energy density needed by SLM is reduced.

The invention discloses a nano TiB2 particle reinforced CoCrNi medium-entropy alloy and a preparation method of the nano TiB2 particle reinforced CoCrNi medium-entropy alloy. The preparation method comprises the following steps: firstly, respectively drying CoCrNi medium entropy alloy powder and nano TiB2 particles, then mechanically mixing, and finally carrying out ball milling treatment to obtain composite material powder. And under the condition of no substrate preheating, the composite material powder is subjected to additive manufacturing forming according to key parameters optimized in a specific range. The preparation method optimizes a pretreatment process and improves the quality of raw materials; and laser additive manufacturing process parameters are optimized, the strengthening effect of the nano TiB2 particles is fully exerted, and a high-performance material can be prepared without preheating the substrate. The average grain size of the obtained alloy is smaller than 3 microns, the density reaches 99.6%, the room-temperature ultimate tensile strength is larger than 1200 MPa, the yield strength is larger than 1000 MPa, the mechanical property is excellent, material guarantee is provided for key equipment application, and application of the CoCrNi medium-entropy alloy in the field of high-strength requirements is expanded.

The invention provides a method for preparing a high-performance silicon nitride ceramic ball based on a pressure modulation sintering technology, and relates to the field of functional ceramic material preparation, and the method comprises the following steps: 1, preparing a green body; 2, PMS sintering is carried out; step 3, cooling; traditional high-performance silicon nitride ceramic balls (the relative density is required to be larger than 99%, the Vickers hardness is required to be larger than or equal to 1500 kgf / mm, the bending strength is required to be larger than or equal to 920 MPa, and the fracture toughness is required to be larger than or equal to 6.0 MPa.m / ) are mainly prepared through a two-step process of normal pressure / air pressure sintering (GPS) and hot isostatic pressing (HIP). Although high densification of the material can be realized, the method has the problems of complicated process flow, high energy consumption, long production period, high equipment occupancy rate and the like.

A ternary paraelectric having a Cc structure and a method of manufacturing the same are provided. The ternary paraelectric having a Cc structure includes a material having a chemical formula of A2B4O11 that has a monoclinic system, is a space group No. 9, and has a dielectric constant of 150 to 250, wherein “A” is a Group 1 element, and “B” is a Group 5 element. “A” may include one of Na, K, Li and Rb. “B” may include one of Nb, V, and Ta. The A2B4O11 material may be Na2Nb4O11 in which bandgap energy thereof is greater than that of STO. The A2B4O11 material may have relative density that is greater than 90% or more.

The invention discloses a design method of a three-dimensional gradient minimum curved surface sandwich structure and the sandwich structure, and belongs to the field of minimum curved surface sandwich structure design, and the design method comprises the following steps: S1, constructing a three-dimensional density distribution characteristic model; s2, constructing a modeling equation of the three-dimensional geometric model of the Gyandroid minimal curved surface structure; s3, obtaining a modeling equation of the three-dimensional gradient minimum curved surface structure; s4, obtaining a three-dimensional model of the three-dimensional gradient minimal curved surface structure through modeling software; s5, preparing a three-dimensional gradient minimum curved surface structure through an additive manufacturing technology; s6, obtaining a three-dimensional gradient minimum curved surface gradient sandwich structure; and S7, performing performance evaluation. By the adoption of the design method of the three-dimensional gradient minimum curved surface sandwich structure and the sandwich structure, the minimum curved surface with the dimension relative density being in gradient change in three directions is designed, the energy absorption performance of the structure is effectively improved, and meanwhile more effective protection on a target is achieved.

To provide an electrolyte particle for use in the manufacture of a solid oxide electrochemical cell, which is a solid electrolyte sintered body constituting a solid oxide electrochemical cell and which can be efficiently manufactured by sintering a densified sintered body having a high relative density at, for example, 1200°C or lower, and a dispersion liquid containing the electrolyte particle.SOLUTION: The present invention relates to an electrolyte particle containing at least one selected from (A) stabilized zirconia consisting of 3.0 to 10.0 mol% scandium oxide, 0 to 2.0 mol% cerium oxide, and 88.0 to 97.0 mol% zirconium oxide, (B) stabilized zirconia consisting of 0.5 to 15.0 mol% yttrium oxide and 85.0 to 99.5 mol% zirconium oxide, and (C) stabilized zirconia consisting of 0.5 to 15.0 mol% ytterbium oxide and 85.0 to 99.5 mol% zirconium oxide, and having a volume average particle diameter of 50 to 150 nm measured using a laser diffraction method.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of target materials, and discloses a preparation method of a high-density, low-resistivity and few-white-skin large-size AZO rotating target material, which comprises the following steps: carrying out spray granulation on mixed slurry of zinc oxide and aluminum oxide to obtain mixed powder; filling the mixed powder into a mold, and carrying out cold isostatic pressing to obtain a green body; the isostatic cool pressing is performed in 4-6 sections, and the pressure of the latter section is 30-60 MPa higher than that of the former section; sintering the green body in an inert atmosphere, heating to 1300-1550 DEG C at a speed of 0.3-2 DEG C / min, preserving heat for 0.5-1 hour, then cooling to 1200-1350 DEG C at a speed of 2-5 DEG C / min, and preserving heat for 10-20 hours to obtain the AZO rotating target material. In an existing preparation technological process, a cold isostatic pressing mode, a sintering schedule and the like are changed, the rotating target material with the length larger than 500 mm, the outer diameter larger than 150 mm and the thickness larger than 20 mm can be obtained, the relative density of the rotating target material is larger than 99.86%, the electrical resistivity is lower than 7-4 ohm cm, the surface quality is good, white skin is few, the internal color and the external color are uniform, and the grain size is smaller than 15 micrometers.

The invention relates to the technical field of ceramics, and discloses a ceramic nozzle material and a preparation method, the ceramic nozzle material comprises 100 parts by weight of alumina, 2-6 parts by weight of a betaine dispersant, and 0.3-2 parts by weight of graphene oxide. The side chain of the betaine dispersing agent contains sulfonic acid quaternary ammonium salt zwitterionic groups, sulfonate can interact with the surface of aluminum oxide, agglomeration of aluminum oxide is reduced, hydroxyl contained in the dispersing agent and the surface of graphene oxide form hydrogen bonding force, and the interface bonding performance of graphene and aluminum oxide is improved. The phase separation defect between graphene and aluminum oxide can be reduced, so that the relative density of the ceramic material is improved, the ceramic material has higher bending strength, the wear rate is obviously reduced, and the wear resistance is better.

The invention belongs to the technical field of transparent ceramics, and discloses a high-entropy transparent ceramic and a preparation method and application thereof. The molecular formula of the high-entropy transparent ceramic is (LuxYySczYbmErn) 2O3, x is more than or equal to 0.05 and less than or equal to 0.6, y is more than or equal to 0.05 and less than or equal to 0.6, z is more than or equal to 0.05 and less than or equal to 0.6, m is more than or equal to 0.05 and less than or equal to 0.6, n is more than or equal to 0.05 and less than or equal to 0.6, and x + y + z + m + n is equal to 1, Lu2O3 powder, Y2O3 powder, Sc2O3 powder, Yb2O3 powder, Er2O3 powder and ZrO2 powder are subjected to ball milling and mixing, calcined and molded at 800-1200 DEG C to prepare a biscuit, and the biscuit is subjected to pressureless sintering at 1600-1800 DEG C in vacuum, annealed and polished to prepare the high The relative density of the ceramic is 99.5% or above, the transmittance at 1000 nm is 76% or above, and the ceramic has good optical, mechanical, corrosion-resistant and radiation-resistant performance and can be applied to the field of nuclear energy window material preparation.

The invention provides an iron yoke structure design method based on a variable density method, and is applied to the field of superconducting electrical iron yoke design. The method comprises the following steps: establishing a target equipment two-dimensional model comprising a superconducting coil, a workpiece and an iron yoke, and setting coil excitation, material attributes and electromagnetic boundary conditions; defining an iron yoke design space and dividing finite elements, and taking the relative density of the finite elements as a design variable; establishing a topological optimization model by taking the magnetic pole gap magnetic flux density as a target function and the yoke volume as a constraint; carrying out magnetic field finite element analysis by utilizing a material attribute interpolation model to obtain magnetic field distribution, and then calculating a magnetic pole gap magnetic flux density module value integral to obtain a target function value; solving the sensitivity of the target and the constraint function to the design variable, modifying the sensitivity, inputting a gradient optimization algorithm, and updating the design variable under the condition that the constraint is satisfied; and if the target function change is smaller than the convergence tolerance, outputting the yoke structure. The invention further provides an iron yoke structure, a device, equipment, a medium and a program product.

The invention discloses a high-performance wear-resistant steel ball production process based on powder metallurgy, and aims at solving the problems that a traditional cast steel ball is poor in wear resistance, the powder metallurgy process is low in efficiency and the like, breakthrough is achieved through multi-phase collaborative design and electric field activated sintering, medium-carbon low-alloy steel is used as a matrix, nano TiC (dispersion strengthening) and h-BN (self-lubricating) are compounded, and the high-performance wear-resistant steel ball production process based on powder metallurgy is obtained; a gradient structure (high Cr / high TiC on the surface layer strengthens wear resistance, and low Cr / low TiC on the core part ensures toughness) is constructed; the electric field activated sintering technology is adopted for low-temperature rapid densification (the density is larger than or equal to 99.2%), and grain growth is remarkably inhibited. The technology breaks through the hardness-toughness contradiction, is suitable for high-impact and high-wear extreme working conditions, and provides a low-cost solution for localization of high-performance wear-resistant materials.

The present invention relates to a preparation process of a high-density tungsten-copper alloy. The preparation process comprises: mixing oxide powder of copper having a certain proportion with oxide powder of tungsten in a dual-power mixer, performing crushing and activation treatment on the mixed powder in a high-speed crusher, and then reducing in a hydrogen atmosphere to obtain the nano tungsten-copper composite powder; and carrying out sheathing, degassing, and hot isostatic pressing treatment on the nano tungsten-copper composite powder, carrying out thermoplastic processing, and then carrying out annealing treatment to obtain the high-density tungsten-copper alloy. The process of the present invention is simple and controllable, has high operability, and is easy to industrialize; the phenomena of component segregation caused by preparation of the tungsten-copper alloy by an infiltration method, and uneven crystal grain size caused by particle aggregation and growth are avoided; and the proportion of the two-phase components can be accurately regulated, so that the tungsten-copper alloy with a tungsten content of 5%-95% can be prepared. The density (relative density) of the prepared tungsten-copper alloy reaches 99.6% or above; the oxygen content is lower than 40 ppm; the alloy has a uniform structure; the crystal grains are fine; and the present invention has wide application prospects and popularization value.

According to the low-shrinkage 3D printing zirconia ceramic and the preparation process thereof, photosensitive polyimide is selected, the photosensitive polyimide has an imine ring and a photosensitive group on a macromolecular chain and has the advantages of excellent photosensitivity, thermal stability, low volume shrinkage and the like, a photoinitiator does not need to be added into a product system, and the preparation process is simple. Curing can be directly completed under ultraviolet irradiation, and the problems of ceramic shrinkage, cracking and the like caused by volatilization or decomposition of a photoinitiator in a workpiece during degreasing are avoided; the ratio of the dispersing agent to the plasticizer in the product system is optimized, the viscosity of the slurry is reduced, the solid content is increased, the shrinkage rate after sintering is reduced, and the flowability and the printing precision of the slurry are ensured. Besides, by combining a flash sintering treatment process, grain growth coarsening is inhibited, a nanoscale compact structure is realized, and internal defects are reduced, so that the zirconia ceramic prepared by the method has the advantages of no defect, compact structure, smaller grain size (smaller than 1 mu m), excellent fracture toughness and higher relative density.

The invention belongs to the field of metal powder additive manufacturing, and particularly relates to a TiZr-based high-entropy alloy additive manufacturing and heat treatment method. The TiZrNbVAl high-entropy alloy is prepared in an additive manufacturing mode, the interior of the printed alloy is almost free of air holes, cracks and other defects, and the relative density reaches 96% or above; the microstructure is composed of isometric crystals and columnar crystals, the structure at the lap joint is compact, and the phenomena of poor lap joint and the like are avoided. Compared with traditional electric arc melting, the yield strength of the prepared printing-state high-entropy alloy exceeds 900 MPa, the elongation at break exceeds 28%, the impact toughness is greatly improved after solid solution heat treatment and reaches 55 J / cm < 2 > or above, the performance exceeds that of most of existing same-system high-entropy alloys, and the application range of the printing-state high-entropy alloy is greatly widened. And the preparation efficiency is greatly improved through the double-barrel printing mode, and the double-barrel printing mode is a green and efficient production mode.

The invention discloses a sintering model construction method and system for ceramic material densification parameter prediction, and relates to the technical field of material science. The method comprises the following steps: quantitatively describing a deformation mechanism of a ceramic material in a sintering process based on continuum mechanics; constructing a sintering model according to the quantitatively described deformation mechanism and densification mechanism of the ceramic material; densification parameters in the sintering process are determined, and the optimal densification parameters are predicted through the sintering model; and calculating the relationship between the instantaneous relative density and the height change of the pressed blank, and verifying the prediction result of the sintering model according to the relationship between the instantaneous relative density and the height change of the pressed blank. According to the method, the macroscopic densification rate and the relative density in the sintering process can be accurately simulated and predicted by constructing the sintering model.

The invention discloses a powder metallurgy preparation method of a titanium-based alloy, and relates to the technical field of powder metallurgy structural materials. Comprising the following steps that S100, multi-component composite powder is prepared, specifically, 68%-73% of titanium, 6%-9% of aluminum, 4%-7% of vanadium and 3%-5% of zirconium are weighed according to the mass percent, and 0.6%-1.0% of tantalum carbide nanoparticles and 0.2%-0.4% of rare earth yttrium are added; the metal powder and the additive are mixed and then added into a planetary high-energy ball mill lined with silicon nitride. By adopting an argon-hydrogen segmented protection ball-milling process, the solid solubility of rare earth yttrium is improved by 25%, the dispersion uniformity index of tantalum carbide nanoparticles is larger than or equal to 0.95, the relative density of a green body is larger than or equal to 98.5% and the density uniformity deviation is smaller than or equal to 1.2% in cooperation with the electric field activation effect of vacuum hot pressing-pulse discharge sintering, and the relative density of the green body is improved by 50% compared with a traditional hot pressing process. The problems of serious powder oxidation, nanoparticle agglomeration and uneven sintering density in the traditional process are solved fundamentally.

The present invention discloses a copper-iron-chromium-nickel quaternary alloy planar sputtering target and a preparation method thereof. The preparation method comprises at least a vacuum induction melting and casting step: copper, iron, chromium, and nickel raw materials are placed in a vacuum induction melting furnace according to a preset mass ratio to form a shaped target material, wherein the shaped target material has a relative density of not less than 99%. Since the shaped target material is melted in the vacuum induction melting furnace, the copper, iron, chromium, and nickel raw materials disclosed in the present invention can be fully fused in the vacuum induction melting furnace. Moreover, since the copper-iron alloy has good electrical and thermal conductivity, high mechanical strength, and wear resistance, the addition of chromium can further improve the corrosion resistance and mechanical properties of the alloy. The addition of nickel can fully cooperate with chromium to transform the metallographic structure from a single-phase ferrite to a two-phase structure of austenite and ferrite, thereby effectively improving the corrosion resistance and mechanical properties of the alloy target material.

The present disclosure addresses the problem of providing: a high-density V2O3 sintered compact; a method for producing a high-density V2O3 sintered compact; and a high-density V2O3 sputtering target. The V2O3 sintered compact has a relative density of 95% or more. The method for producing a V2O3 sintered compact comprises subjecting a V2O3 powder to hot press sintering at 1350-1450°C under vacuum or in an inert atmosphere gas.

The invention belongs to the technical field of target materials, and discloses a preparation method of a large-size AZO target material, which comprises the following steps: carrying out spray granulation on mixed slurry of zinc oxide and aluminum oxide to obtain mixed powder; carrying out mould pressing on the mixed powder to obtain a target blank; performing cold isostatic pressing on the target blank to obtain a green body; the isostatic cool pressing is performed in 4-6 sections, and the pressure of the latter section is 30-60 MPa higher than that of the former section; sintering the green body after degreasing and draining; the sintering process comprises the following steps: embedding a green body into zinc oxide powder, and sintering to obtain the large-size AZO target material. The length of the large-size AZO target material is greater than 500mm, the width is greater than 300mm, and the thickness is greater than 15mm; the relative density is greater than 99.8%, and the resistivity is lower than 7-4 omegacm. In an existing preparation process flow, the large-size AZO target material with the relative density larger than 99.8% and the resistivity lower than 7-4 omegacm can be obtained by changing a cold isostatic pressing mode and a sintering mode, an existing production line can be utilized, the equipment and site cost is not increased, and the industrial value is huge.

The invention belongs to the technical field of target materials, and particularly relates to a production method of a large-size nickel oxide planar target, which comprises the following steps: S1, injecting slurry containing nickel oxide into a mold, and drying to obtain a primary blank; s2, degumming the primary green body, and pre-sintering the primary green body in an oxygen-free atmosphere; s3, crushing and sieving the pre-sintered primary green body to obtain powder, adding a binder, uniformly mixing, granulating, sieving, and carrying out cold isostatic pressing to obtain a secondary green body; s4, the secondary blank is heated and sintered, and the large-size nickel oxide planar target is obtained; the large-size nickel oxide planar target prepared by the preparation method disclosed by the invention has relatively low resistivity and relatively high relative density.

The invention belongs to the field of target material preparation, and discloses a sodium-doped copper target material and a preparation method thereof. Comprising the following steps: (1) mixing and ball-milling copper powder and Na-containing powder, and then homogenizing to obtain a raw material mixture; and (2) the raw material mixture is placed in a mold, vacuum hot pressing sintering is carried out after prepressing, and the sodium-doped copper target material is obtained. The relative density of the prepared target material is high and can reach 90% or above, and the components are uniform.

Provided is a sputtering member composed of an alloy of Co and a group 5 element in the periodic table, such as a Co-Nb alloy, capable of suppressing particles generated during sputtering. This sputtering member contains not less than 1 at% but less than 25 at% of Nb, the remaining portion being Co and unavoidable impurities. The sputtering member has a relative density of 99.7% or more. This sputtering member contains not less than 1 at% but less than 25 at% of the total of one or more of V, Nb, and Ta, the remaining portion being Co and unavoidable impurities. The sputtering member has a relative density of 99.7% or more.

The invention discloses a preparation method of ZnO-based voltage-sensitive ceramic based on heat treatment assisted cold sintering. The preparation method comprises the following steps: preparing a citric acid solution from deionized water and citric acid; mixing the initial ZnO powder with a metal oxide dopant to form precursor powder, mixing the precursor powder with a citric acid solution, and grinding and dispersing to obtain mixed slurry; putting the mixed slurry into a steel mold, applying pressure, and carrying out cold sintering; and carrying out heat treatment on the cold-sintered sample to finally obtain the high-performance ZnO-based voltage-sensitive ceramic. The ceramic with the relative density as high as 99% is prepared under the condition that the temperature is less than or equal to 950 DEG C, the prepared ceramic also has an excellent nonlinear coefficient as high as 92 and ultrahigh breakdown strength of 1600V / mm, and the ZnO-based piezoresistor prepared by a solid-phase method is far beyond that of a ZnO-based piezoresistor prepared by a solid-phase method. Compared with a traditional high-temperature sintering process, the sintering temperature is reduced, energy is saved, and the electrical performance can be remarkably improved.

The present invention addresses the problem of providing a ceramic spherical body that is not susceptible to breakage even when crushed and dispersed under high-temperature conditions at a liquid temperature of 60 DEG C or higher. The present invention is a ceramic spheroid containing zirconium oxide as the main component, containing 3.5 mol% to 8.0 mol% of CaO, having an average particle diameter of 0.01 mm to 0.3 mm, having a relative density of 99% or more, and having a ratio of monoclinic crystals as determined by powder X-ray diffraction measurement of 1 vol% or less.

The invention belongs to the technical field of refractory materials. The invention provides a graphene ceramic composite material and a preparation method and application thereof, the preparation method comprises the following steps: adding zirconium boride particles, silicon carbide particles, yttrium oxide and lanthanum-doped cerium oxide into a graphene oxide dispersion liquid, and carrying out ball milling and drying to obtain raw material powder; the raw material powder is put into a graphite mold to be sintered, and the graphene ceramic composite material is obtained. The raw material powder is prepared from the following components in parts by volume: 5.6 to 6 parts of graphene oxide, 70 to 72 parts of zirconium boride particles, 20 to 21 parts of silicon carbide particles, 1.5 to 2 parts of yttrium oxide and 1 to 1.3 parts of lanthanum-doped cerium oxide. By increasing the content of graphene oxide, the bending strength of the composite material is further improved while the relative density of the prepared composite material is increased.

The invention relates to the field of target material preparation, and provides a low-color-difference and high-density IZO target material preparation process, by adding a sintering aid SnO2 into IZO powder, sintering activation energy can be reduced, grain boundary diffusion can be promoted, pores can be filled, density can be improved, a uniform solid solution can be formed with IZO, and segregation of Sn element can be inhibited; a high-energy sand mill is adopted for sanding, powder agglomeration can be destroyed, it is ensured that SnO2 and IZO are evenly dispersed, grains are refined, the grain size D50 is smaller than or equal to 0.8 micrometer, and the sintering mass transfer efficiency is improved. Density consistency can be achieved, the relative density difference after multi-section target blank sintering is smaller than or equal to 1%, the relative density difference in a traditional process is larger than or equal to 3%, and the single-section density reaches 99.8%; after polishing, the target material delta E is less than or equal to 1.3, the L / a / b deviation is less than or equal to 0.3, and the high-end display requirement is met; the sintering temperature is reduced, the use amount of a sintering aid is small, and the comprehensive cost is reduced.