346results about How to "Improve sintered density" patented technology

The laminated ceramic capacitor has a laminate block made of alternately laminated ceramic dielectric layers and internal electrodes, a pair of cover layers, laminated on top and bottom of the laminate block, ceramic bodies formed on both side faces of the laminate block, and a pair of external electrodes that are electrically connected to the internal electrodes, wherein the average grain size of the ceramic dielectric grains constituting the ceramic body is smaller than the average grain size of the ceramic dielectric grains constituting the ceramic dielectric layer in the laminate block.

A sintered compact sputtering target is provided and contains Co and Cr as metal components and includes oxides dispersed in the structure formed of the metal components. The structure of the sputtering target has a region (A) containing Co oxides dispersed in Co and a region (D) containing Cr oxides in a periphery of the region (A). In addition a method of producing the above referenced sintered compact sputtering target is provided and includes the steps of mixing a powder prepared by pulverizing a sintered compact containing Co oxide dispersed in Co, a Co powder, and a Cr power and pressure-sintering the resulting powder mixture to provide a sputtering target.

The invention provides a garnet-type Li-ion conductive oxide, that is, Li7La3Zr2O12, and the garnet-type Li-ion conductive oxide has relatively high sintered density and high ionic conductivity. The garnet-type Li-ion conductive oxide is formed by Li, La, Zr, and O. The garnet-type Li-ion conductive oxide is characterized by containing at least one element respresented by M1, M2, M3, and M4. The M1, M2, M3, and M4 represent the following elements. M 1 is more than one element selected from of Mg, Ca, Sr, Ba, and Zn. M2 is more than one element selected from Al, Ga, Co, Fe, and Y. M3 is more than one element selected from Sn and Ge. M4 is more than one element selected from Ta and Nb.

The invention relates to a method for preparing an iron-based superconductor. The method comprises the following steps: correspondingly processing iron-based superconductor precursor powder to obtain a lumpish or strip sample; putting the lumpish or strip sample into an Ar atmosphere protected or vacuum intense magnetic field heat treatment furnace; preserving the heat under a magnetic field intensity of between 0.1 and 30 Tesla and at the temperature of between 500 and 1,500 DEG C for 0.1 to 100 hours; and cooling the sample to room temperature together with the heat treatment furnace to obtain an iron-based superconductor sample; or the method comprises the following steps: dispersing sintered iron-based superconductor powder in a solvent; ultrasonically mixing the powder and the solvent; keeping the mixture in a magnetic field with a magnetic field intensity of between 0.1 and 30 Tesla for 0.1 to 2 hours; evaporating the solvent; putting the iron-based superconductor powder which is treated in the magnetic field into an Ar atmosphere or vacuum heat treatment furnace; and preserving the heat at the temperature of between 500 and 1,500 DEG C for 0.1 to 100 hours to obtain the iron-based superconductor sample. The method can effectively improve the connectivity of crystalline grains, greatly enhances the critical current density, upper critical field and irreversible field of the iron-based superconductor and makes the practicability of the iron-based superconductor become possible.

A recipe and two sequential processes for fabrication of electrode substrates of solid oxide fuel cells (SOFCs) are described in this invention. The typical recipe consists of 50˜86 wt % electrolyte (8YSZ) or 50˜80 wt % anode electrode (NiO/8YSZ), 12˜22 wt % MEK (solvent 1), 5˜9 wt % EtOH (solvent 2), 1˜2 wt % TEA (dispersant), 0.5˜2 wt % DBP (plasticizer 1), 0.5˜2 wt % PEG (plasticizer 2), 3˜6 wt % PVB (binder), and 0.1˜10 wt % graphite (pore former). Two sequential processes include: 1. The process for preparation of the green tape slurry from materials of the recipe, 2. The synergistic process for fabrication of a high integrity membrane electrode assembly (MEA) of SOFC from the prepared electrode substrates.

The invention relates to a pressureless sintering preparation method for boron carbide ceramic, and coarse particle powder with the particle size larger than 2 micrometers is taken as raw materials. The method comprises the following steps that 70-80 wt % of boron carbide powder (D50>=2 micrometers), 4-8 wt% of carbon powder and 0.7-2 wt% of yttrium oxide powder are put into a ball mill mixing container, ball mill slurrying is performed after binding agents, dispersing agents and deionized water are added, and the solid phase content of obtained slurry is 25-45 wt%; the obtained slurry is prepared into granulating powder with a spray drying granulating machine; the granulating powder is pressed into green bodies by adopting a dry-pressing molding technology or isostatic cool pressing molding technology at 100-200 MPa; the green bodies are placed in a vacuum furnace, a vacuum or normal pressure sintering mode is adopted, heat preservation is performed for 0.5-5 h at the temperature of 2000 DEG C-2300 DEG C, sintering is completed, and then the boron carbide ceramic is obtained. According to the pressureless sintering preparation method for the boron carbide ceramic, due to the fact that the coarse particle boron carbide powder which is low in cost is adopted as the raw materials and the pressureless sintering technology capable of achieving scale production is adopted, the preparation cost of the boron carbide ceramic can be greatly lowered, and therefore the method is suitable for the fields of nuclear power, semiconductor equipment, armor protection and the like.

The invention relates to a potassium niobate natrium series leadless piezoelectric ceramics and the manufacturing method. It is expressed by the general equation: (1-u)[(1-n)(LitNa1-w-t1Kw-t2)(Nb1-g-fTagSbf)O3+nBiMeO3]+uM. The invention has stable manufacturing technology and has great usefulness.

The invention provides a method for preparing high-density iron-base powder metallurgy parts, and belongs to the technical field of powder metallurgy molding. The compaction density of iron-base powder can be increased by utilizing the special stratified structure, the low friction factor and the good lubricating property of MoS2 (molybdenum disulfide). The method comprises the following steps: uniformly mixing the iron powder with MoS2 powder, carrying out annealing treatment, and causing MoS2 to be uniformly distributed on the surface of the iron powder; and uniformly mixing annealed mixed powder with a certain amount of metal powder, graphite powder and the like, and pressing and sintering to obtain the high-density iron-base parts. In the pressing process, the friction force among powder particles is reduced and the friction state among the powder particles is improved through the MoS2, the pressing performance is increased, and the iron-base powder metallurgy parts with the density of 7.2g/cm3-7.5g/cm3 can be obtained. The method has the advantages that the pressing performance of the iron-base powder is improved; the high-density iron-base powder metallurgy parts is obtained on the premise of cost reducing; the friction factor is reduced, the loss of abrasive tools is decreased, and meanwhile, the adverse influence of sulphur on the iron-base parts does not exist; and the process is simple and suitable for industrial production.

The invention relates to a multielement potassium niobate natrium series leadless piezoelectric ceramics and the manufacturing method. It is expressed by the general equation: (1-u)[(1-z-n)(LitNa1-w-t1Kw-t2)(Nb1-g-fTagSbf)O3+ z(Bi0.5Na0.5xK0.5 (1-x))TiO3+nBaTiO3]+uM. The invention has stable manufacturing technology and has great usefulness.

The invention relates to a pressureless sintering boron carbide ceramic preparation method of using more than 2 microns of coarse-grained powder as a raw material. The preparation method comprises the following steps: putting 70-80 wt% of boron carbide (D50 is greater than or equal to 2 microns), 4-8 wt% of powdered carbon, 0.7-2 wt% of yttrium oxide powder and the balance a binder and a dispersant into a mixing container of a ball mill, adding deionized water and ball-milling for pulping so as to obtain slurry with solid content being 25-45 wt%; preparing granulation powder from the slurry by using a spray drying granulating machine; pressing the granulation powder at 100-200 MPa by a dry pressing or isostatic cool pressing process to generate a green body; and putting the green body into a vacuum furnace, and carrying out thermal insulation at 200-2300 DEG C for 0.5-5h to finish sintering by a vacuum or pressureless sintering mode so as to obtain boron carbide ceramic. As the low-cost coarse-grained boron carbide powder is used as the raw material, manufacturing cost of the boron carbide ceramic can be reduced greatly by the pressureless sintering process for large-scale production. The boron carbide ceramic is suitable for fields of nuclear power, semiconductor equipment, armor protection and the like.

A solid-solution-doped LLZO inorganic oxide solid electrolyte is prepared from the following preparation raw materials in percentage by mass: 49 to 54% of lanthanum trioxide (La2O3), 29 to 33% of lithium hydroxide (LiOH), 12 to 14% of zirconium dioxide (ZrO2) and 2 to 4% of tetraethoxysilane, and can further comprise one or more of 0%-8% of aluminum oxide (Al2O3), 0%-8% of niobium oxide (Nb2O5) and 0%-8% of tantalum oxide (Ta2O5). The inorganic oxide solid electrolyte has the advantages of high compactness and high ionic conductivity. The organic oxide solid electrolyte prepared by the methodcan be used for preparing an all-solid-state power ion battery with high discharge capacity, and the obtained all-solid-state battery has excellent performance, high power density, high energy densityand good safety. The obtained all-solid-state battery can replace a traditional lithium ion battery, is particularly suitable for electric transport vehicles, electric power storage and the like, andhas a good application prospect.

The invention belongs to the technical field of magnetic materials, and discloses a high-stability garnet microwave ferrite magnetic sheet and a preparation method thereof. The material composition ofthe high-stability garnet microwave ferrite magnetic sheet is Y<3-f-2d-a>Gd<f>Ca<2d+a>Bi<e>Fe<5-a-b-c-d-sigma>SnInMn<c>V<d>O<12>, wherein a is more than 0 and no more than 0.7; b is more than 0and no more than 0.7; c is more than 0 and no more than 0.6; d is more than 0 and no more than 1.5; e is more than 0 and no more than 0.6; f is more than 0 and no more than 0.8; and sigma is more than 0 and no more than 0.4. According to the high-stability garnet microwave ferrite magnetic sheet, Bi<3+> ions are added into the material, so the dielectric constant of the material is improved, anda Curie temperature is increased; and in addition, SnO<2>, In<2>O<3>, SnO<2> and In<2>O<3> are added into the material, so the anisotropy coefficient K of the material can be reduced, and the ferromagnetic resonance linewidth Delta(H) of the material is reduced. In terms of the process, high-pressure sintering is adopted to replace normal-pressure sintering, so sintering density is improved, the porosity of the material is reduced, and the ferromagnetic resonance linewidth Delta(H) of the material is reduced. Thus, the problem that the temperature coefficient of the material is poor is solved,and the material is guaranteed to have low ferromagnetic resonance linewidth Delta(H), high dielectric constant and high Curie temperature.