3038 results about "Sintering" patented technology

The invention provides a performance optimization and regulation method for a high-temperature sintering furnace, and belongs to the technical field of intelligent regulation, and the performance optimization and regulation method comprises the following steps: arranging sensors in each heating area of the high-temperature sintering furnace, and monitoring the heating areas in real time; constructing a heating area operation state database, comparing the collected real-time data with a preset sintering process parameter range, and analyzing to obtain a performance analysis set of each heating area; establishing a three-dimensional heat conduction model, simulating heat flow distribution of each heating area under different heating powers and temperature settings, determining a thermal coupling effect of each heating area in different stages, and determining a heat transfer coefficient between adjacent heating areas; and an initial strategy of the high-temperature sintering furnace is determined, the initial strategy is optimized based on the auxiliary parameters of all the heating areas, and all the heating areas of the high-temperature sintering furnace are regulated and controlled according to the optimization strategy. The problems of inaccurate temperature control, single parameter analysis, insufficient thermal coupling effect processing and the like in the traditional regulation and control technology are effectively solved.

The invention discloses a high-entropy alloy bonding phase SiC hard composite material and a preparation method thereof, the SiC hard alloy composite material is a double-phase composite material and comprises SiC and high-entropy alloy, and the high-entropy alloy is AlMnCuiFeTi and AlZnCuFeTi. The proportion of the raw materials is 5 wt.%-20 wt.%. And the size of the SiC particles is 200 [mu] m. During preparation, firstly, the high-entropy alloy is prepared through mechanical alloying; after uniform mixing, a graphite mold is filled with the mixture for prepressing, the prepressing pressure is 10-50 MPa, and prepressing is conducted for 10-30 s; and then hot pressed sintering is carried out, the sintering pressure is 20-50 MPa, the sintering temperature is 1400-2000 DEG C, heat preservation is carried out for 10-90 min, and the high-entropy alloy bonding phase SiC hard alloy composite material is prepared. The liquid phase generated in the high-entropy alloy sintering process is used for reducing the sintering temperature, the organization structure is improved, and the hardness and toughness of the tungsten carbide hard alloy are improved.

The present disclosure belongs to the technical field of silver powder preparation, and particularly relates to a method for preparing a silver powder having adjustable sintering activity, and a conductive silver powder and the use thereof. The preparation method comprises the following steps: S1, subjecting a reducing agent, a sintering regulator, a dispersing agent and water to primary mixing, then adding an oxidizing agent solution under stirring conditions, and reacting same after the addition is finished, wherein a surfactant is introduced during the primary mixing and / or the surfactant is introduced into the oxidizing agent solution; and S2, filtering the material obtained in S1, then subjecting the material and a coating liquid containing a coating agent to secondary mixing, and then drying the mixture, so as to obtain a silver powder. The present disclosure can result in a silver powder having different sintering activities, and can satisfy usage scenarios of carrying out sintering in different temperature sections, such as the use in different temperature scenarios including low-temperature sintering and high-temperature sintering; and during the silver powder preparation process of the present disclosure, no slurry is formulated, and the sintering activity of the silver powder is directly tested by means of a thermal mechanical analyzer, such that the development process is more convenient, and characterization is more accurate.

The invention provides a detection method for evaluating the sintering quality of an artificial heat-conducting film. The method comprises the following steps: constructing a personalized database containing electrical conductivity data corresponding to the artificial heat-conducting film under different materials and different process conditions; identifying performance fluctuation parameters of different sintering production devices and the same sintering production device in different production periods by analyzing the conductivity data; the method comprises the following steps: arranging multiple types of sensors on artificial heat-conducting film sintering production equipment, and collecting key parameters in the sintering production equipment; fusing the multiple types of key parameters through a data fusion algorithm to obtain a fused data set; the sintering production equipment is adjusted according to the performance fluctuation parameters; and inputting the key parameters in the fusion data set into the sintering quality evaluation model, and comparing the key parameters with the standard parameters of the personalized database to obtain a comparison result. Through the quality evaluation model and the automatic feedback mechanism, intelligent adjustment of the sintering process is achieved, and the product quality and the production efficiency are improved.

According to the mullite castable preparation method based on comprehensive utilization of the secondary aluminum ash nonferrous smelting slag, components are regulated and controlled by controlling the molar ratio of Al2O3 to SiO2, so that porous light mullite stably falls into a mullite phase region, and generation of excessive corundum phases is avoided. PMMA microspheres, corn flour, carbonized rice husks and SiO2 coated calcium carbonate composite pore-forming agent systems are adopted, and a layered slurry formula, gradient slip casting and segmented sintering processes are combined, so that the porosity and strength distribution are accurately regulated and controlled, and low-temperature sintering and amorphous phase change control are realized. By optimizing the grading of the porous light mullite aggregate and adding the homologous fine powder, the bonding strength and compressive strength of the castable are improved. And finally, the surface of the castable is coated with a compact mullite coating, so that the porosity is reduced, and the erosion resistance, corrosion resistance and stripping resistance are remarkably improved. The obtained castable has the advantages of light weight, high temperature resistance, high strength, low cost and excellent thermal stability and erosion resistance.

The invention discloses a production method of a high-performance sintered neodymium-iron-boron magnet. The production method comprises the steps of rapid quenching flaking, hydrogen decrepitation mixing, magnetic field forming, multi-stage treatment and composite coating. A nanocrystalline sheet is prepared through a rapid quenching technology, and uniform distribution of a grain boundary phase and rare earth elements is achieved through hydrogen decrepitation and material mixing; forming in a strong magnetic field and applying high pressure to improve the orientation degree; through high-temperature sintering, medium-temperature annealing and low-temperature aging treatment, magnet densification, grain boundary phase reconstruction and a magnetic domain structure are optimized; and finally, the corrosion resistance is improved by adopting a composite coating. The high-performance sintered neodymium-iron-boron magnet produced by the method comprises a main phase alloy, a grain boundary phase additive and a rare earth supplementary phase. Through low-oxygen nanocrystal preparation, grain boundary coordinated regulation and green process integration, compatibility of high performance, low cost and environmental protection is realized, and sustainable development of the rare earth permanent magnet material is promoted.

The invention belongs to the technical field of preparation of boron carbide ceramics, and particularly relates to a preparation method of high-purity porous boron carbide ceramics based on high-frequency induction heating, under the condition that a sintering aid is not added, a plunger is forced to move downwards due to volume expansion caused by CO2 generated by a melt, so that boron carbide powder is pressurized, the effect of hot pressing sintering can be achieved, and the effect of high-purity porous boron carbide ceramics can be achieved. The problems of low yield and high cost caused by the use of a hot-pressing sintering furnace can be avoided, the comprehensive performance of the prepared boron carbide ceramic can be improved, the process is easy to control, and the method is suitable for mass production of the boron carbide ceramic round rod for the high-temperature gas cooled reactor nuclear control rod; the prepared boron carbide ceramic has the advantages of pure phase, high porosity, uniform pore structure and stable mechanical property, especially has very good pore connectivity, and can ensure timely discharge of helium and improve the safety of the nuclear control rod when being used as a high-temperature gas cooled reactor nuclear control rod.

The invention discloses copper-containing slurry suitable for high-temperature sintering and a preparation method thereof, and the copper-containing slurry comprises the following components in percentage by mass: 10-80% of copper powder, 0-80% of silver powder, 0.2-1% of low-softening-point glass powder, 0-3% of high-softening-point glass, 15-20% of an organic carrier and 0.5-3% of an organic auxiliary agent, the low-softening-point glass powder is of a Pb-Te-Li system, the softening temperature ranges from 250 DEG C to 350 DEG C, and the softening temperature is lower than the decomposition temperature of the organic coating agent on the surface of the copper powder. The preparation method comprises the following steps: adding the components according to the ratio, stirring until the components are uniformly dispersed, grinding and sieving to obtain the copper-containing slurry suitable for high-temperature sintering. According to the prepared copper-containing slurry, the low-softening-point glass powder is adopted as a key component, a liquid-phase protection layer is formed in the high-temperature sintering process, oxidation and diffusion of copper are effectively inhibited, and the oxidation resistance and the conductive stability of the copper-containing slurry are improved. Meanwhile, the slurry has good flowability and printing performance, and can meet the requirements of the photovoltaic industry for efficient and low-cost conductive materials.

The invention discloses an integrated preparation method of a SiC-based composite material environment barrier coating in the technical field of aviation thermal structure materials, which comprises the following steps: cleaning a substrate, carrying out vacuum impregnation of phenolic resin and curing, coating Si slurry to form a bonding layer, coating rare earth silicate slurry to form a barrier layer, and drying to obtain the SiC-based composite material environment barrier coating. And finally carrying out high-temperature heat treatment in an inert atmosphere. According to the method, through an integrated slurry coating and gradient curing process, the performance of a base body is protected, and meanwhile efficient preparation of the coating is achieved; by adopting an integrated slurry coating and gradient curing technology and combining with an optimized medium-temperature sintering process, the matrix performance is effectively protected while the compactness of the coating is ensured, the bonding strength and interface stability of the coating are improved through the design of the phenolic resin transition layer and the silicon bonding layer in cooperation with the rare earth silicate barrier layer, and the bonding strength of the coating is improved. And the coating shows excellent protection performance in a high-temperature corrosion environment.

The invention relates to the technical field of high-performance structural ceramic materials and corrosion resistance optimization thereof, in particular to a preparation method of high-performance silicon nitride ceramic, which realizes performance improvement through dynamic optimization of a composite sintering aid, closed-loop regulation and control of air pressure sintering and multi-process data linkage. In the raw material pretreatment stage, a laser particle size analyzer is adopted for monitoring particle size distribution in real time, surface modification parameters are adjusted in a linkage mode, and a uniform monomolecular coating layer is formed; the proportion of rare earth oxide and aluminum oxide in the composite sintering aid is dynamically adjusted according to the fluctuation of the mixing torque, and agglomeration and segregation of the aid are inhibited. And in the air pressure sintering stage, the argon pressure and the heating rate are dynamically adjusted based on the slope of a shrinkage curve, and directional arrangement of beta-phase grains is promoted by combining low-temperature nitrogen protection and high-temperature argon densification. And multi-dimensional process control synergistically optimizes grain boundary components, structure and density, so that the corrosion resistance and the service life of the silicon nitride ceramic in a sulfur-containing environment are remarkably improved and the service life of the silicon nitride ceramic in the sulfur-containing environment is remarkably prolonged.

The invention relates to the technical field of sole processing, in particular to a sole composite processing method, which comprises the following steps: according to the rigidity requirement of an arch support area, preparing high-density slurry in which silicon nitride ceramic powder accounts for 30-40%, forming # imgabs0 # crystal phase through microwave-assisted sintering, and controlling the porosity to be 10-20%; according to the energy rebound requirement of the forefoot buffer area, graphene oxide / carboxymethyl cellulose aerogel powder is added into the slurry until the concentration is 25%, and the porosity is increased to 40-60% by combining the honeycomb porous network design; a nano silicon dioxide reinforcing agent is introduced into a wear-resistant area of the heel to 15%, a diamond-like carbon coating is formed through plasma surface treatment, and the porosity is limited to be 5-15%. According to the invention, silane is encapsulated by adopting polyurea microcapsules, and is released only when the material is damaged, so that dynamic self-repairing is realized, the shoe sole is endowed with dynamic repairing capability, and the service life is prolonged.

The invention provides a spacecraft quartz powder heat insulation tile which is prepared by adopting high-purity quartz powder (SiO2) as a main raw material and combining a high-temperature-resistant ceramic fiber reinforcement and a nano aerogel heat insulation layer through a high-temperature sintering process. The heat insulation tile has the following advantages: 1, the heat insulation tile has excellent high temperature resistance, and can tolerate 1600 DEG C high temperature for a long time and tolerate 1800 DEG C instantaneous thermal shock for a short time; 2, repeated use: the structure is stable, and high strength is still kept after multiple thermal cycles; light weight: the density is low (less than or equal to 0.5 g / cm < 3 >), and the load of a spacecraft is reduced; and 4, the thermal conductivity is low (less than or equal to 0.05 W / m.K), and heat transfer is effectively isolated. The method is suitable for thermal protection systems (TPS) of spacecrafts, such as thermal insulation of reentry capsules and rocket engine nozzles.

The invention relates to the technical field of inductors, in particular to an inorganic insulation integrally-formed power inductor and a preparation method thereof. The method comprises the following steps: S1, selecting a coil; s2, pre-stretching the coil; s3, pre-coating of inorganic powder is carried out; s4, pressing the magnetic powder; s5, sintering the ceramic layer at high temperature; and S6, integrally forming the inductor. By reasonably selecting the material and shape of the coil and the type of the magnetic powder and combining high-temperature sintering at the temperature of 250 DEG C or above, the magnetic conductivity and the bias resistance are improved, the diversified requirements of high frequency, high temperature, high power density and the like are met, and the performance of insulation, heat conduction and the like can be optimized; according to the integrated forming process, coil pre-packaging and magnetic core forming are completed in one step, production procedures are reduced, process integration and production efficiency are improved, production cost is reduced, the utilization rate of a magnetic core window reaches 100%, and the product size is reduced.

The invention discloses an ultra-high-compaction lithium iron phosphate positive electrode material as well as a preparation method and application thereof. According to the preparation method of the ultra-high-compaction lithium iron phosphate positive electrode material, mixed powder of a lithium source, niobium-doped iron phosphate, a titanium source, a tungsten source and a composite carbon source is subpackaged in a first container and a second container, then high-temperature sintering is carried out at the same time in an inert gas atmosphere, and the lithium iron phosphate positive electrode material is obtained after mixing. In the high-temperature sintering process, the first container and the second container are placed in the same sintering container, the first container is arranged above the second container, a first heat source is arranged above the first container, a second heat source is arranged below the second container, the temperature of the first heat source is 720-760 DEG C, and the temperature of the second heat source is 780-820 DEG C; or, the temperature of the first heat source is 780-820 DEG C, and the temperature of the second heat source is 720-760 DEG C. According to the invention, the particle size of the sintered material is controlled by setting the gradient temperature difference, so that the large and small particle size grading of the lithium iron phosphate positive electrode material is realized, and the ultra-high-compaction lithium iron phosphate positive electrode material is obtained.

The invention relates to the technical field of intelligent sintering, and discloses a rare earth magnet intelligent sintering production line and a control system, and the system comprises a temperature data collection module, a temperature gradient evaluation module, a temperature change rate fitting module, a heating power adjustment module, a directional heat energy compensation module and an optimized heating instruction generation module. Temperature distribution information in the sintering furnace is obtained; evaluating real-time temperature gradients of different positions in the sintering furnace, and comparing the real-time temperature gradients with a preset gradient threshold value to identify a temperature abnormal region in the sintering furnace; fitting the temperature change rate of the temperature abnormal area; the material phase change critical parameters of the rare earth magnet in the current sintering stage are combined to adjust the heating power of the temperature abnormal area; performing directional heat energy compensation on the temperature abnormal region to obtain a power compensation amount; superposing the power compensation amount and the reference power of the sintering furnace to generate an optimized heating instruction; the intelligent sintering control efficiency of the rare earth magnet can be improved.

The invention discloses a PCBN (Polycrystalline Cubic Boron Nitride) composite sheet and a sintering process thereof. The sintering process of the PCBN composite sheet comprises the steps of material mixing, hot prepressing sintering, hot prepressing cooling, cubic pressure sintering and cooling to the room temperature, and raw materials in the mixed material comprise, by mass, 30%-85% of CBN micro powder and 15%-70% of binding agent micro powder. The PCBN composite sheet prepared by the sintering process is high in surface flatness and has relatively high hardness and cutting output.

The invention relates to a double-rare-earth crystal inhibition reinforced modified ultra-high-temperature protective coating as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a CVD-SiC inner coating on the surface of a matrix material by adopting a chemical vapor deposition method; a slurry sintering method is adopted, and a double rare earth (DRE) doped silicon-based structure anti-oxidation middle layer is prepared on the surface of the CVD-SiC inner coating; and preparing the PVD-ZrC thermal ablation prevention outer coating on the rare earth doped silicon-based anti-oxidation layer by adopting a physical vapor deposition method. According to the SiC / dRe coated Si-ZrSi2-ZrB2 / ZrC coating provided by the invention, the crystallization growth of SiO2-TGO in a silicon-based component structure is inhibited by doping rare earth oxide (REO) and / or rare earth carbide (REC), so that the stress accumulation and thermal expansion mismatch effect of the coating in a thermal service process is greatly relieved. Meanwhile, the complementary advantages of silicon-based ceramic and ultra-high-temperature ceramic in the aspects of oxidation resistance and ablation resistance are fully combined, the thermal protection capacity of the coating under the ultra-high-temperature condition is improved, the service life of the coating is remarkably prolonged, and the service stability of the coating is remarkably improved.

The invention discloses a silicon nitride ceramic based on a Yb2O3-MgSiN2 composite sintering aid and a preparation method of the silicon nitride ceramic, the silicon nitride ceramic comprises 93wt% of a Si3N4 matrix, 1-7wt% of Yb2O3 and the balance of MgSiN2, and the total mass of the Yb2O3 and the MgSiN2 as the composite sintering aid is 7wt%. The preparation method comprises the following steps: mixing the raw materials with absolute ethyl alcohol, then adding grinding balls, pouring the mixture into a polyethylene ball milling tank for ball milling, carrying out forced air drying treatment and grinding and sieving treatment on obtained slurry, and then putting sieved powder into a mold for SPS sintering. The problems that traditional silicon nitride ceramic is too high in sintering temperature, insufficient in grain boundary stability and the like are solved, and performance balance of low-temperature sintering, low oxygen content and high grain boundary stability of the silicon nitride ceramic is achieved under the industrial-grade production condition through the synergistic effect of material component innovation and process optimization; and a key material solution is provided for preparing the silicon nitride ceramic with good performance.

The invention provides a sleeve material for molding an aspheric glass lens and a preparation method of the sleeve material. The method comprises the steps that 1, raw material powder is mixed and dried, tungsten carbide powder and Si3N4 powder are mixed in a ball milling tank in an inert atmosphere to obtain composite powder, and the adding amount of the Si3N4 powder is 1 wt%-15 wt%; (2) die filling; putting the composite powder into a graphite female die, and pre-pressing under the pressure of 5-20 MPa; (3) sintering is conducted, specifically, the mold is placed in an SPS system, the initial axial pressure ranges from 5 MPa to 10 MPa, vacuumizing is conducted till the pressure is 10 Pa or below, gradient heating sintering is conducted, the highest sintering temperature ranges from 1500 DEG C to 1900 DEG C, the highest sintering pressure ranges from 40 MPa to 60 MPa, and after heat preservation is finished, the mold is taken out after cooling; and (4) sampling: carrying out sand blasting treatment on the graphite on the surface of the sample to obtain the sleeve material for molding the aspheric glass lens. The material has a lower thermal expansion coefficient.

The invention discloses a preparation method of a TPMS structural ceramic membrane with high air permeability. The TPMS structural ceramic membrane is prepared by taking the ceramic slurry as a raw material and adopting photocuring 3D printing forming and high-temperature sintering. A digital model of a TPMS structural ceramic membrane is constructed on the basis of a three-period TPMS structure, the ceramic membrane is composed of a TPMS porous structure supporting body and a thickness-controllable separation layer, and the TPMS structural supporting body prepared through 3D printing remarkably reduces the permeation resistance of the ceramic membrane through high porosity and low pore channel tortuosity of the TPMS structural supporting body. The TPMS structural ceramic membrane is formed at a time through photocuring 3D printing and formed through one-time sintering, the preparation period is effectively shortened, and sintering energy consumption is reduced. The prepared TPMS structural ceramic membrane is high in air permeability, uniform and controllable in pore structure and good in stability in a high-temperature environment, and an efficient material is provided for high-temperature gas dust removal.

The invention discloses a preparation method and application of monolithic BiVO4 photocatalytic foamed ceramic. The method comprises the following steps: 1) preparing composite slurry containing BiVO4 powder, an organic additive and a reinforced phase; (2) uniformly attaching the composite slurry to the organic foam skeleton by adopting an impregnation method; 3) performing drying and heat treatment to remove organic components; and 4) performing high-temperature sintering to form the three-dimensional communicated porous structure. Through the structure-function integrated design, the problems that a traditional powder catalyst is difficult to recover, the activity of an immobilized catalyst is low and a supported catalyst is easy to fall off are solved. The obtained product is high in porosity, the compressive strength is larger than or equal to 0.1 MPa, the specific surface area is larger than or equal to 0.1 m < 2 > / g, visible light can be efficiently utilized for degrading emerging organic pollutants in water, and the degradation rate reaches 20-99%. The material has no nano-particle leakage risk, has excellent mechanical strength, chemical stability and engineering applicability, and provides a feasible scheme for large-scale application of a photocatalytic water treatment technology.

The invention relates to a bionic Al / SiC composite material with a three-dimensional network multilevel structure and a preparation method of the bionic Al / SiC composite material, and belongs to the technical field of new material preparation. According to the method, through the collaborative process of freeze casting and organic foam impregnation, the problem that in the prior art, the multilevel aperture and the complex network structure are difficult to cooperatively regulate and control is solved. The preparation method comprises the following specific steps: preparing tert-butyl alcohol-based ceramic slurry, impregnating the slurry with polyurethane foam, performing freeze casting molding, removing a solvent through freeze drying, performing high-temperature sintering to form SiC ceramic with a three-dimensional reticular hierarchical pore structure, and finally preparing the Al / SiC composite material through a vacuum pressure infiltration process. Wherein a sintering aid is added into the slurry, so that the sintering temperature is obviously reduced; the specification (40-60 ppi) of polyurethane foam, the solid phase content (20-30 vol.%) of slurry, the freezing speed (0-90 DEG C) and the content (5-20 wt.%) of a sintering aid are regulated and controlled. And the cross-scale collaborative design of micron-scale directional holes and millimeter-scale mesh holes is realized. The Al / SiC composite material prepared by the invention has the advantages that the compressive strength, fracture toughness and other properties are obviously higher than those of the traditional single-aperture porous ceramic, and the Al / SiC composite material is suitable for the fields of manufacturing and energy absorption of precise instruments, electronic packaging and optical devices.

The preparation method comprises the following steps: 1, dispersing an iron source, a phosphorus source, a lithium source, a carbon source, a dispersing agent, an element doping agent and a solvent in proportion, dividing the dispersed slurry into three parts of slurry A, B and C in proportion, respectively grinding the three parts of slurry, and respectively carrying out spray drying; 2, pre-sintering the three parts of spray materials at different temperatures, and crushing the pre-sintered materials; and step 3, mixing the crushed pre-sintered materials so as to realize multi-stage grain composition. Carrying out dry mixing on a carbon source and the pre-crushed material according to a certain mass ratio; and 4, carrying out secondary sintering, crushing and demagnetizing on the mixed material to obtain the multi-stage grading high-compaction lithium iron phosphate positive electrode material. According to the invention, primary sintering material grain grading and secondary carbon coating and sintering strengthening are realized through graded particle size design, and the compaction density and the specific capacity of the lithium iron phosphate positive electrode material are synergistically improved.

The invention relates to the technical field of zirconia ceramic sintering, and discloses a zirconia ceramic microwave single-die-cavity rapid sintering system and an intelligent temperature control method.The system comprises a high-temperature-resistant metal cavity, a microwave generation unit, a temperature detection and control unit, a coil base assembly and an auxiliary structure, and centralized control is achieved through an intelligent touch control computer. A microwave single-mode resonance mode is adopted, a silicon carbide wave absorbing layer is used for enhancing microwave absorption, materials are evenly heated from inside to outside, an intelligent temperature control method is used for monitoring the temperature in real time based on a short-wave infrared thermometer, a PI D control algorithm is combined, the power of a magnetron is dynamically adjusted through an adjustable power source, the temperature control precision reaches + / -2 DEG C, and the temperature control precision reaches + / -2 DEG C; the problems of non-uniform temperature, high energy consumption, high rejection rate, long sintering time and the like in a traditional zirconia ceramic sintering process are effectively solved, the production efficiency can be greatly improved, the cost is reduced, the product quality is improved, the equipment also supports multiple process modes, and diversified production requirements are met.

The invention discloses a rare earth antibacterial ceramic and a preparation method thereof, and belongs to the technical field of ceramic materials, the rare earth antibacterial ceramic comprises a base material, a rare earth antibacterial agent and an auxiliary additive, the base material is coated with a zirconium silicate coating layer; the matrix material is one of aluminum oxide or zirconium oxide, the rare earth antibacterial agent is a ternary composite oxide composed of at least three lanthanide elements, the lanthanide elements comprise Ce, Y, La and Nd, and the invention provides a preparation method of the composite material. Through collaborative innovation of ternary rare earth composite modification, zirconium silicate interface coating and a gradient sintering process, the core problems of single antibacterial spectrum, high-temperature failure and insufficient durability of traditional antibacterial ceramic are solved, and the antibacterial property, stability, biological safety and mechanical property are remarkably improved; and the method has clear technical progress and industrial application value.

A kind of preparation method of high compaction lithium iron phosphate of multistage gradation, including step one: iron source, phosphorus source, lithium source, carbon source, dispersing agent, element dopant and solvent are dispersed according to proportion, slurry after dispersion is divided into A, B, C three slurry according to proportion, three slurry are grinded respectively, and then are respectively carried out spray drying;Step two: three spray materials are respectively pre-sintered at different temperatures, and pre-sintered material is respectively crushed;Step three: the material after pre-sintering is mixed to realize multistage particle gradation.Certain mass ratio of carbon source and pre-crushed material are dry mixed;Step four: after secondary sintering, crushing and magnetic removal process, the multistage gradation high compaction lithium iron phosphate positive material is obtained.The present application realizes particle gradation of once sintered material, secondary carbon coating and sintering strengthening by grading particle size design, and realizes the collaborative improvement of compaction density and specific capacity of lithium iron phosphate positive material.

The invention discloses a sintering method using solid waste activated carbon powder. The sintering method comprises the following steps: preparing a mixture A and a mixture B; spraying quicklime digestion liquid to the surface of the solid waste activated carbon powder, and granulating to form an activated carbon powder inner core; taking the activated carbon powder inner core as a pelletizing core, pelletizing by utilizing the mixture A to form a pellet inner core A, and pelletizing by utilizing the mixture B to form an activated carbon powder pretreated pellet; preparing an upper-layer sintering mixture and a lower-layer sintering mixture; the lower-layer sintering mixture is added to a sintering trolley to be sintered; and when the sintering pallet runs to 1 / 5-1 / 3 of the total length of the sintering machine, the upper sintering mixture is distributed and added to the surface of the formed sinter layer for sintering. The problems that the combustion characteristics of the solid waste activated carbon powder and the coke powder are not matched and the solid waste activated carbon powder is high in sulfur and nitrogen impurity content to affect the sinter quality are solved, the problems that due to sintering of a thick bed, the permeability of the bed is reduced, the bottom sinter is over-melted and the sinter quality is uneven are solved, and the metallurgical performance index of the sinter is improved.

The invention relates to a preparation method of an MAX phase material. According to the specific technical scheme, precursor powder materials needed for preparing the MAX phase material are mixed to obtain mixed powder, the mixed powder is subjected to mechanical ball milling and cold press forming to form a blank, a to-be-sintered blank is obtained, the to-be-sintered blank is subjected to ultra-fast Joule hot sintering, and the MAX phase material is prepared. The MAX phase material is prepared by using an ultra-fast Joule thermal sintering method, the Joule thermal sintering method has the characteristics of high heating and cooling rate (104 DEG C / min) and high heating temperature (3000 DEG C), and according to the Arrhenius formula, the synthesis rate of the MAX phase material can be greatly improved due to the characteristics of high heating and cooling rate and high heating temperature, and rapid preparation of the MAX phase material is realized. According to the method, the preparation period of the MAX phase material can be greatly shortened, so that the aging can be improved, the energy consumption can be reduced, accurate and controllable preparation can be realized, and the method has important significance on low-cost and large-scale preparation of the MAX phase material.

The invention relates to the technical field of vacuum physical vapor deposition, and provides a preparation method of a porous structure low-density IWO evaporation target material based on current calcination, which comprises the following steps: firstly, carrying out current calcination on raw materials, promoting WO3 crystal grains to preferentially grow along the 111 crystal orientation by utilizing a Joule effect, forming a long-range ordered structure, increasing the density after calcination, and then crushing to retain the crystal form, so as to obtain the low-density IWO evaporation target material with the porous structure. The preparation method comprises the following steps of: adding a 15wt% PVA ethanol solution, then carrying out ball-milling cold isostatic pressing molding, then carrying out distributed sintering, volatilizing PVA to form a porous framework through first-step sintering, carrying out second-step sintering to obtain crystal grains with a continuous porous structure, and finally carrying out RPD film coating under specific parameters, so that the powder falling rate is reduced, and the TCO film is good in uniformity; through the processes of current calcination, crushing, binder forming and sintering, on the premise that the low density of the target material is kept, cooperative control over directional connection of a porous structure and crystals is achieved, the powder falling rate is reduced by 60%, the regular porous structure and ordered crystal arrangement effectively disperse thermal stress, and structural collapse is avoided; the evaporation stability is improved, and the surface roughness is reduced to Ralt; the evaporation rate fluctuates by + / -5%, and the film uniformity reaches + / -2.0%.

The invention belongs to the field of metal processing, and relates to an in-situ self-generated NiMoCoAlTi high-entropy alloy toughened metal ceramic material and a preparation method thereof. According to the invention, Ti (C, N) ceramic is used as a matrix, Ni, Mo, Co, Al and Ti are directly added as binders, and spark plasma coupling high-frequency induction sintering is carried out to obtain the high-temperature-resistant ceramic. The preparation method comprises the following steps: firstly, mixing Ti (C, N), Ni, Mo, Co, Al and Ti, then carrying out ball milling and drying to obtain powder, and carrying out spark plasma coupling high-frequency induction sintering. The method is beneficial to improving the mechanical property of the material, saves the preparation time of the high-entropy alloy powder, and has the advantages of being simple in preparation method, convenient to operate and the like. The obtained titanium carbonitride-based metal ceramic has higher toughness and hardness and excellent antifriction and wear-resisting properties, and can be used for manufacturing high-precision numerical control machine tool guide rails and other wear-resisting and corrosion-resisting parts.