266results about How to "Easy to sinter" patented technology

A process for producing a cell for solid oxide fuel cells comprising a porous electrolyte layer-forming step of obtaining an electrolyte substrate in which a porous electrolyte layer is formed by applying a slurry for forming an electrolyte layer containing an electrolyte substance powder and a pore-forming agent to the surface of an electrolyte substrate and burning the electrolyte substrate, and an electrode layer-forming step of obtaining an electrolyte substrate in which an electrode substance-filled porous electrolyte layer and an electrode layer are formed by applying a slurry for forming an electrode containing an electrode substance powder, a mixture of an electrode substance powder and an electrolyte substance powder, or a composite material powder of an electrode substance and an electrolyte substance, onto the surface of the porous electrolyte layer of the electrolyte substrate on which the porous electrolyte layer is formed, and burning the electrolyte substrate in which the porous electrolyte layer is formed. According to the present invention, a process for producing a cell for solid oxide fuel cells which can increase the three-phase interface of the porous electrolyte layer and exhibits only a small conductivity reduction of the electrolyte layer can be obtained.

An object of the present invention is to provide a hot plate which is superior in thermal conductivity, is superior in temperature-rising/dropping property, particularly in temperature-dropping property, and has high cooling thermal efficiency at the time of cooling. The hot plate of the present invention is a hot plate comprising: a ceramic substrate; and a resistance heating element formed on the surface of said ceramic substrate or inside said ceramic substrate, wherein said ceramic substrate has a leakage quantity of 10⁻⁷ Pa·m³/sec (He) or less by measurement with a helium leakage detector.

The invention relates to a high-strength calcium hexa-aluminate light heat insulation material and a preparation method thereof. The preparation method is characterized by using 70-85wt% of Al2O3 fine powder, 2-8wt% of rho-Al2O3 micro powder and 13-22wt% of nano CaCO3 as raw materials, adding a water reducer accounting for 0.05-0.30wt% of the raw materials and water accounting for 20-80wt% of the raw materials and mixing the materials for 30-150 minutes, thus obtaining a premix; then adding foam to the premix, mixing the materials for 3-8 minutes, moulding the mixture by casting and naturally drying the product; then roasting the product at 90-110 DEG C for 24 hours and insulating the product at 1430-1650 DEG C for 3-6 hours, thus obtaining the high-strength calcium hexa-aluminate light heat insulation material, wherein the addition amount of the foam in the premix is 0.1-2.0L per kg of raw materials. The high-strength calcium hexa-aluminate light heat insulation material has the characteristics of energy conservation, environment friendliness, easiness in demoulding of green bodies and easiness in sintering, has stable properties, low content of impurities, low volume density, high strength and low heat conductivity coefficient.

A laminated common-mode choke coil offering higher insulation reliability has a glass ceramic layer, two spiral internal conductors facing each other and sandwiching the glass ceramic layer in between, and insulation layers sandwiching the two internal conductors, wherein the glass ceramic layer contains segregated Al regions and the maximum dimension t₁ of each segregated Al region in the glass ceramic layer, in the layer-thickness direction, is no more than 80% of the distance t₀ between the two internal conductors.

The invention relates to a preparation method of a polycrystalline cubic boron nitride (PcBN) composite material, which comprises the following steps: by using nonstoichiometric titanium nitride (TiNX, 0.3<=x<=0.6) as the basic component of a binder in the PcBN composite material, constituting a binder with one or both of aluminum nitride (AlN) and titanium carbide (TiC), and sintering with monocrystalline cubic boron nitride (cBN) under the conditions of high temperature and high pressure to prepare the PcBN composite material, wherein the pressure is 4-6.5GPa, the temperature is 1400-1650 DEG C, and such pressure and temperature are kept for 1-25 minutes. Since the PcBN composite material is prepared from the cBN and the binder mainly composed of the nonstoichiometric titanium nitride (TiNX, 0.3<=x<=0.6), the polycrystal does not contain any simple substance element or alloy phase, thereby avoiding the existence of soft spot. The hardness of the obtained PcBN composite material is up to 38-55GPa, and the fracture toughness is up to 3.31-4.12MPa.m1/2.

The invention discloses a low-dielectric LTCC green tape as well as a preparation method and use thereof. The low-dielectric LTCC green tape is composed of a powder, a solvent, a dispersing agent, a binder and a plasticizer, wherein the powder is in a mass fraction of 40-60%, and prepared from 10-40wt% of a glass material, 1-10wt% of a low melting point oxide sintering aid and the balance of a ceramic material; the chemical composition of the ceramic material is Zn2-xSiO4-x, where x=0.05-0.3. In the present invention, the problem of low-temperature sintering ofZn2-xSiO4-x ceramic is solved byadding the crystallizable glass material and the sintering aid together, and the mechanical properties and the high-frequency electrical characteristics of the system can be improved.

The invention relates to an alpha-SiAlON/BN composite ceramic material and a preparation method thereof. The preparation method comprises the following steps: adopting the hot pressing sintering technology and alpha-silicon nitride powder, aluminum nitride powder, alumina powder and yttrium oxide powder as raw materials to design components according to the general formula of alpha-SiAlON, namelyYm/3Si12-(m+n)Alm+nOnN16-n, wherein m and n are the parameters of the selected components; and adding hexagonal boron nitride, performing ball milling to the raw powder, drying, granulating, filling in a graphite mould, heating in a heating rate of 10-40 DEG C/min under dynamic nitrogen atmosphere to 1800-1950 DEG C, and sintering for 30-120min under 15-35MPa. The alpha-SiAlON/BN composite ceramic prepared by the method of the invention is characterized by high temperature resistance and high high-temperature strength.

Disclosed is a metal nanoparticle paste that uses the low-temperature sintering characteristics of metal nanoparticles to easily obtain a metal bond with excellent conductivity and mechanical strength, and which can form a wiring pattern with excellent conductivity. The metal nanoparticle paste is characterized by containing (A) metal nanoparticles, (B) a protective film that coats the surface of the metal nanoparticles, (C) a carboxylic acid, and (D) a dispersion medium.

The invention discloses an environment-friendly converter bedding-face repairing material and a preparation method thereof. The repairing material comprises the following ingredients by weight percent: 30 to 65 percent of sintering magnesium sand, 10 to 45 percent of waste magnesite-chrome bricks, 1 to 10 percent of asphalt powder, 5 to 15 percent of tar, 1 to 5 percent of ethanol, 1 to 5 percent of N-methyl-2-pyrrolidinone and 0 to 5 percent of o-xylene. The preparation method comprises the following steps: 1) pre-crushing the sorted sintering magnesium sand and recycled waste magnesite-chrome bricks; 2) uniformly mixing the pre-crushed sintering magnesium sand and waste magnesite-chrome bricks to obtain a mixed coarse material; 3) finely crushing the mixed coarse material to obtain a mixed fine material; 4) uniformly mixing the mixed fine material and asphalt powder in a stirring machine; 5) adding tar, ethernol, N-methyl-2-pyrrolidinone and o-xylene, and stirring the mixture for 10 to 25 minutes. The practices prove that the converter repairing material has good mobility, can be sintered easily, has long service life and generates little smoke when sintered.

The invention discloses a preparation method of a cathode material of a lithium-rich ternary compound lithium ion battery. The molecular formula of the cathode material is Li1.2Ni0.13Co0.13Mn0.54O2. The preparation method comprises the steps of firstly, stirring an organic precipitant in constant temperature water bath to dissolve the organic precipitant in an organic solvent to obtain a solution I; after that, ultrasonically dissolving soluble cobalt salt, nickel salt, manganese salt and lithium salt in deionized water to obtain a solution II; then, dropwise adding the solution II into the solution I at constant speed, and carrying out a reaction at the temperature of 40-80 DEG C for 2h-4h; drying at 100-120 DEG C; and heating the obtained solid powder in a high temperature tube furnace system by stages, calcining, and cooling the product to room temperature along with the furnace to obtain the lithium-rich ternary compound lithium ion battery cathode material which is good in electrochemical performance and uniform in particles, and has a spherical or ellipsoidal morphology feature. The preparation technology is simple and suitable for industrial scale production.

The invention relates to the technical field of brake materials, in particular to a powder metallurgy friction material for high-speed train braking and a preparation method of the powder metallurgy friction material. The powder metallurgy friction material is prepared from the following raw materials: copper powder, iron powder, copper-plated flake graphite, copper-plated graphite granules, chromium iron powder, molybdenum disulfide powder and alumina fiber through a powder metallurgy process. The powder metallurgy friction material has good mechanical properties, and is stable in friction coefficient, small in abrasion loss and good in thermal failure resistance; through the adopted raw materials and the ratio, the friction material with excellent properties can be prepared at the relatively-low sintering pressure and temperature, energy consumption is saved, a preparing process is simple and easy to control, the performance is excellent, and good application prospects are achieved.

Additionally, a coating composition comprising gelatine, water and a metal and/or ceramic powder is used to form coating layers on selected materials.

The invention provides copper conductive slurry. The copper conductive slurry is prepared from the following raw materials and components in parts by weight: 70wt% to 90wt% of approximately spherical micron copper powder of polyhedron appearance, 0.01wt% to 3wt% of a stabilizer, 0.1wt% to 5wt% of a binder and 9wt% to 30wt% of a solvent. In the invention, the slurry adopts the proximately spherical micron copper powder with high single crystal content, and the copper powder is large in contact area, easy to sinter and high in specific conductance; the used copper powder is 0.5 to 3 microns in particle size, and can meet the using requirement of fine circuits; flash sintering is directly carried out after silk-screen printing, and the copper conductive slurry is simple in technology and is applicable to large-scale production; the stabilizer is added in the system, copper oxide is reduced in the sintering process, the content of the copper oxide in a copper line is reduced, a conductive circuit with low copper oxide content is obtained, and the conductive slurry adopts the aqueous binder, so that the copper conductive slurry has the characteristics of being environmentally-friendly, energy-saving and easy to clean.

The invention relates to an anhydrous stemming for a blast furnace. The anhydrous stemming is prepared from the following raw materials in percentages by weight: 30-40 percent of high-alumina bauxite, 10-15 percent of high-purity silicon carbide, 20-25 percent of soft clay, 10-25 percent of carbonaceous material, 5-15 percent of submicron powder, 15-25 percent of binding agent, and additionally silicon metal powder addictives accounting for 1-3 percent of the total weight of the raw materials. The anhydrous stemming has the advantages of favorable high-temperature fire performance, linearity change ratio of lower than 0.3 percent under the condition of 1400 DEG C*2h, breaking strength of more than or equal to 10MPa, high intensity, slag-iron resistant scouring, easy sintering, excellent work performance, less pollution and low production cost, and is beneficial to environment protection as well as popularization and application.

The invention relates to a thermal-state mending material taking forsterite as a raw material for converters and a preparation method thereof. The technical scheme is as follows: adopting 45-70wt% of sintered magnesia particles, 5-15wt% of graphite and 15-40wt% of forsterite fine powder as raw materials; adding simple substance silicon powder accounting for 1-10wt% of the weight of the raw materials and liquid pitch modified phenolic resin accounting for 15-25wt% of the weight of the raw materials; and stirring for 5 to 30 minutes to obtain the slurry thermal-state mending material taking forsterite as the raw material for converters. While being used, the thermal-state mending material is poured into the converter, the converter is rotated to enable the mending material to flow to the charging position, the tapping position, the bedding face and the furnace bottom of the steelmaking converter which are in need of thermal-state mending and the mending material is sintered by the heat in the converter. The material has the characteristics of abundant raw materials, low production cost, excellent hydration-proof performance, easiness in sintering at a high temperature and convenience in combination with the converter lining and is beneficial for prolonging the service life of materials of the converter lining.

Composite metal powder for sintered bearings, prepared by coating surface layers of particles of iron powder with 10 wt.% to less than 30 wt.% of copper based on the iron powder so that the particle size of the coated iron powder is at most 80 meshes, the content of the powder of at most 350 meshes is at most 30%, and the specific surface area of the powder is 450-750 cm<SP>2</SP>/g according to the subsieve sizer method. This metal powder can provide an oil-retaining bearing for motors, which is capable of providing a low gas-permeability without decreasing the oil content and which has a low and constant coefficient of friction, a high corrosion resistance, a high adaptability and a high durability, readily at a low cost.

The invention belongs to the technical field of ceramics and refractory materials, and particularly relates to a method for preparing ZrB2-Al2O3 composite powder. Fe2O3 powder and metal Al powder are taken as raw materials of a thermit, the metal Al powder, ZrO2 powder and B2O3 powder are taken as raw materials for synthesizing the ZrB2-Al2O3 composite powder, and the heat emitted by a thermit reaction is utilized to ignite a reaction for synthesizing the ZrB2-Al2O3 composite powder. The method has a simple preparation technology, does not need special equipment and atmosphere, has cheap needed raw materials and small energy consumption and using time, and is environment-friendly; and the synthesized powder has high purity, fine granularity, and low manufacturing cost.

The invention provides a preparation method of apatite oxide electrolyte powder. The preparation method chooses organic or inorganic precursor which can provide apatite electrolyte components as raw material; the raw material is dissolved in non-aqueous solvent, and the mixed solution and the complexing agent form sol and gel; at last, the apatite oxide electrolyte powder can be obtained by drying, sintering and some other technique process. The particle size is 20-400 nanometers. The preparation method has low requirement on equipment, simple technique, narrow particle distribution and high product purity and the obtained product has even particles.

Provided is a manufacturing method for improving sintered NdFeB magnet coercive force. On the basis that the original composition ratio of a sintered NdFeB magnet is not changed, parameters of the rapid hardening process for magnet casting are changed to achieve secondary jet milling so that the average particle size of particles of the magnet can be less than or equal to2.5um, after lower-temperature sintering is controlled between 1020 DEG C and 1035 DEG C for 3.5-5.0 hours, aging treatment is carried out under 450-600 DEG C for 4-6 hours, the powder size of the magnet is lowered after rapid hardening casting and secondary jet milling technologies, surface activity is increased, the particles are easily compacted in a sintered mode, compactness of the magnet can be guaranteed and meanwhile grains can be prevented from rapidly growing up through combination of the lower-temperature sintering, magnetic performance of the magnet is improved, the coercive force is increased by 2-3kOe on average, and the price performance ratio of the magnet is remarkably increased.

The invention discloses a method for preparing low-cost sintered neodymium (Nd) iron (Fe) boron (B) by doping lanthanum (La) cerium (Ce), and the method comprises following steps of (1) utilizing a quick-hardening sheet vacuum sensing smelting furnace to smelt a NdFeB material and to prepare a NdFeB alloy sheet with thickness of 0.3 to 0.5mm; (2) utilizing a hydrogen broken furnace to pulverize the NdFeB alloy sheet to NdFeB alloy powder of 110 to 150 micrometers; (3) grinding the obtained powder into NdFeB alloy powder of 3.5 to 4.5 micrometers through the airflow; (4) adding the LaGe alloy powder into the powder to be uniformly mixed; (5) utilizing a magnetic field press machine to orient and form the powder under the magnetic field, and acquiring pressed blank with density of 4.6 to 4.8 g/cm<3> through isostatic cool pressing; (6) placing the pressed blank into a vacuum sintering furnace to be sintered, and ensuring the sintered magnet of (PrNdGd)2936 to 29.65(LaCe)0.99 to 1.96(FeCoAlCu)67.63 to 68.3B1.05 to 10.6. The LaGe powder which is processed by special process is added to substitute rich neodymium phase in the NdFeB, so that the LaCe can be prevented from being excessively mixed with the NdFeB mani phase to influence the magnetic performance, and an effect for improving the product performance and reducing the product cost can be realized.

The invention discloses a high-aluminum silicon carbide casting material combined with a silica sol. The high-aluminum silicon carbide casting material is prepared from the following raw materials in parts by weight: 60-80 parts of bauxite with particle size of 8-0mm, 10-15 parts of silicon carbide with particle size of 180-320 meshes, 2-7 parts of alpha-Al2O3 micropowder with particle size less than 0.5mu m, 2-5 parts of kyanite with particle size of 80-120 meshes, 10-15 parts of brown corundum with particle size of 160-200 meshes, 2-5 parts of sodium tripolyphosphate and 5-10 parts of silica sol. The high-aluminum silicon carbide casting material combined with a silica sol has the beneficial effects that: the chemical activity of the silica sol is large; the casting material is easy to sinter; after middle-temperature sintering, the strength of the casting material is not reduced; the property of the casting material is greatly improved at the temperature of 1500 DEG C; the thermal shock stability of the casting material is good; and water cooling can be carried out over forty times at the temperature of 1100 DEG C.