67results about How to "Optimizing the sintering process" patented technology

The invention discloses a method capable of significantly improving the coercive force of spinelle CoFe2O4 ferrite and belongs to the technical field of preparation of ferrite materials. The method comprise the following steps: respectively preparing CoFe2O4 and SrFe12O19 nanopowder by virtue of a hydrothermal method, and then doping a small amount of SrFe12O19 nanopowder (mass ratio of 6%-10%) into the CoFe2O4 ferrite, evenly mixing, tabletting and sintering at a temperature of 700 DEG C-900 DEG C for 2 hours. According to the method, by virtue of the exchange coupling effect between the CoFe2O4 and SrFe12O19 nanocrystalline phases and the pinning effect of SrFe12O19 ferrite, the coercive force of the CoFe2O4 ferrite is significantly improved and the coercive force can be improved by 93% to a maximum extent. The method has important value for further practical application of the CoFe2O4 ferrite.

The invention relates to a preparation method of a composite sagger. The method adopts mullite and cordierite as the main raw materials, takes attapulgite, calcined kaolin, diopside, fused magnesia, red mud, nano aluminum hydroxide sol, silica powder and reinforced fiber as auxiliary materials, at the same time in the preparation process, water quenching, oil cooling and post-treatment processes are employed to improve the physicochemical properties of the product, the prepared sagger has good thermal stability, strong compressive strength, corrosion resistance, and difficult cracking.

The invention discloses A-site high-entropy perovskite oxide MeTiO3 thermoelectric ceramic and a preparation method thereof. The A-site high-entropy perovskite oxide MeTiO3 has a single-phase perovskite structure, the elements in the A-site high-entropy perovskite oxide MeTiO3 are uniformly distributed without agglomeration, and the A-site high-entropy perovskite oxide MeTiO3 has thermoelectric performance and can be used in the field of thermoelectric materials. The chemical composition of the A-bit high-entropy perovskite oxide MeTiO3 is (Ca < 0.2 > Sr < 0.2 > Ba < 0.2 > La < 0.2 > Pb < 0.2 >) TiO3, (Ca < 0.25 > Sr < 0.25 > Ba < 0.25 > La < 0.25 >) TiO3, (Ca < 0.25 > Sr < 0.25 > Ba < 0.25 > Pb < 0.25 >) TiO3, (Ca < 0.25 > Sr < 0.25 > Ba < 0.25 > Nd < 0.25 >) TiO3, (Ca < 0.25 > Sr < 0.25 > Ba < 0.25 > Sm < 0.25 >) TiO3, and (Ca < 0.25 > Sr < 0.25 > Ba < 0.25 > Eu < 0.25 >) TiO3. According to the invention, the high entropy of the perovskite structure is realized, the disorder degree of atom arrangement in the material composition is improved, the phonon scattering is increased, and the thermal conductivity is reduced, so that the thermoelectric performance is improved. In the sintering process, oxygen atoms are migrated and discharged through oxygen vacancies in material crystal lattices, the porosity is reduced, the ceramic density is improved, meanwhile, the oxygen vacancy concentration is improved, and the carrier concentration of the material is improved. By adopting a reduction annealing process of argon and carbon powder, the semiconduction of perovskite oxide is realized, the carrier concentration of the ceramic is improved, the conductivity is improved, and the thermoelectric performance is further improved.

The invention relates to a preparation method of a composite sagger. The method adopts forsterite and mullite as the main raw materials, takes potassium feldspar, calcined bauxite, sepiolite, montmorillonite, aluminum phosphate, zirconium silicate, aluminum nitride and high aluminum fiber as the auxiliary materials, at the same time adopts the process of water quenching, oil cooling and post-treatment during preparation to improve the physical and chemical properties of the prepared product. The prepared sagger has the advantages of good thermal stability, strong compressive ability, corrosion resistance, and difficult cracking.

The invention discloses a high-frequency low-consumption high-saturation flux density soft magnetic ferrite material and a preparation method thereof. The ferrite material consists of main components and secondary components, wherein the main components comprise 54.5-55.5 mol% of Fe2O3, 3.5-6 mol% of ZnO, 0.10-0.25 mol% of Co2O3 and the balance of MnO on the basis of respective oxides; the secondary components comprise one or more of Nb2O5, CaCO3, V2O5, ZrO2 and Ta2O5. The preparation method comprises steps of material preparation, sand milling, pre-calcining, thermal treatment, molding and sintering. Due to addition of Co2O3 in the main components, and constitution contents of the main components and the secondary components are controlled, a sintering process is optimized, and the soft magnetic ferrite material simultaneously has properties of high frequency, low consumption and high flux density.

The invention discloses a sintering method capable of improving sintering desulfurization rate. The sintering method capable of improving the sintering desulfurization rate is characterized by comprising the following steps: mixing iron ore powder with the granularity of 2 to 10 mm, a certain proportion of fuel and a quick lime-containing flux in a certain proportion to form a sintering material; paving a grate-layer material on a sintering machine, and then uniformly paving the sintering material on the grate-layer material, wherein the thickness of the sintering material is 700 to 800 mm; finally, igniting and sintering, wherein the igniting temperature is 1,000 to 1,200 DEG C. The sintering desulfurization rate can be improved, and meanwhile, the using amount of coke and the cost of raw ore powder are reduced by sintering by the sintering method; the overall resources are saved; the production cost is reduced; obvious economic benefit is brought to a sintering plant.

The invention discloses a method for judging the granulation selectivity strength between different iron ore powder particles. The method comprises the following steps: (1) taking a certain size fraction of iron ore powder A and iron ore powder B, and calculating the average particle sizes DA and DB of the iron ore powder A and the iron ore powder B at the corresponding size fractions; (2) calculating the maximum molecular water film thicknesses DFA and DFB and the maximum capillary water film thicknesses DMA and DMB of fraction samples taken from the iron ore powder A and the iron ore powderB; (3) calculating values of DMA / DA and DMB / DB, and judging whether the selective strength is good or bad when the iron ore powder A and the iron ore powder B are used as adhesive particles at the same time; and (4) calculating the value of |DMA-DMB|, comparing |DMA-DMB|, DFA and DFB, and judging the mutual selective strength during the contact granulation of the iron ore powder A and the iron orepowder B. The method is high in operability, can quantitatively judge the selection behavior of the particles in the iron ore powder granulation process, and has high practical significance in deeplyresearching the behavior of the iron ore powder particle granulation process.

The invention discloses a sub-nanometer spherical silicone micro powder-containing high-tenacity composite ceramic. The sub-nanometer spherical silicone micro powder-containing high-tenacity composite ceramic is prepared from matrix raw materials and auxiliary agents, wherein the matrix raw materials is prepared from the following components in parts by weight: 65 to 80 parts of zirconium oxide, 5 to 10 parts of aluminum oxide, 5 to 7 parts of kaoline, 3 to 6 parts of lithium feldspar, 3 to 8 parts of alkali-earth metal carbonate, 0 to 0.5 part of rare-earth metal oxide, 4 to 8 parts of basalt fiber and 3.5 to 7.5 parts of sub-nanometer spherical silicone micro powder; and the auxiliary agents comprise the following components in parts by weight: 3 to 5 parts of sodium silicate, 0.5 to 2 parts of ethylene glycol monobutyl ether, 1 to 2 parts of barium hydroxide, 1 to 3 parts of carboxymethyl cellulose, 0.5 to 1.5 parts of polyethylene fiber, 1.2 to 2 parts of potassium sulphate and 1.5 to 3 parts of lauryl sodium sulfate. A plurality of tenacity reinforcing measures are taken to improve elasticity and structural mechanical property of the ceramic, particularly, the compactness of a ceramic matrix is improved by the sub-nanometer spherical silicone micro powder, and the ceramic matrix has enough tenacity, strength, hardness and abrasion resistance.

The invention discloses an ultrahigh saturation magnetic flux density manganese-zinc ferrite material, which is composed of a main component and an auxiliary component. The main component is composedof 55.25-56.25 mol% of Fe2O3, 2.5-3.5 mol% of ZnO, 0.10-0.20 mol% of Co2O3 and the balance of MnO in terms of oxide; and the auxiliary component includes 0.01-0.06 wt% of Nb2O5, 0.05-0.15 wt% of CaCO3, 0-0.05 wt% of NiO, 0.01-0.04 wt% of V2O5, 0-0.01 wt% of SiO2, 0-0.05 wt% of TiO2 and 0-0.05 wt% of Ta2O5. The manganese-zinc ferrite material prepared by the invention has the power consumption of less than 250kW / m<3> at the temperature of 25 DEG C and 100 DEG C under 3MHz and 30mT, and the saturation flux density at the temperature of 100 DEG C reaches 460 mT or above, so that the manganese-zinc ferrite material adapts to the requirements of a high-frequency transformer and a server inductor.

The invention discloses a process for low-temperature sintering of manganese zinc ferrite. The process comprises a step (1) of primary sanding, a step (2) of presintering, a step (3) of secondary sanding, a step (4) of granulation and a step (5) of sintering. The process for low-temperature sintering of manganese zinc ferrite is improved and optimized, the process steps are simple, the maneuverability is high, the temperature of the manganese zinc ferrite can be reduced by 100-200 DEG C, the production energy consumption is greatly reduced, and the production cost is reduced.