105results about How to "Fully sintered" patented technology

A novel method of manufacturing a transition metal oxide having a spinel structure is provided. A mixture of powdery metals of metal elements constituting the transition metal oxide is heated in an oxidizing atmosphere to generate the transition metal oxide.

The invention discloses a sliver clay which is composed of sliver powder, bismuth powder, an adhesive, grease and water, wherein, the content of each component calculated based on weight is as follows: 70-80% of the sliver powder, 0.3-1.2% of the bismuth powder, 5-8% of the adhesive, 1-2% of the grease, and the rest of water; the sliver powder is composed of 30-40% of micro sliver powder with the average grain diameter less than or equal to 0.5Mum and the rest of micro sliver powder with the average grain diameter of 1-3Mum by weight. The sliver clay of the invention has a lower sintering temperature, and can be fully sintered at the temperature of 450-500 DEG C. The invention further discloses a method for preparing silverware with the sliver clay.

The invention discloses a preparation method of a dispersion type gas permeable brick for ladle, and belongs to the technical field of refractory materials. The preparation method comprises the following steps: mixing a corundum mixture with zirconia powder, adding an additive, a dispersant, and water, stirring and mixing to obtain a mixture; transferring the mixture to a mould, carrying out vibration moulding to obtain a blank; curing the blank at a constant temperature in the absence of light, removing the mould, burning the blank in a calcining furnace, cooling the blank to a room temperature, transferring the blank to a sintering furnace, sintering the blank under the protection of argon, cooling to a room temperature, performing discharging to obtain a primarily sintered gas permeablebrick; processing the primarily sintered gas permeable brick by a processing liquid, delivering the primarily sintered gas permeable brick to a sintering furnace, carrying out low temperature carbonization under the protection of nitrogen, then performing high temperature sintering to obtain secondarily sintered gas permeable brick; mixing the secondarily sintered gas permeable brick with water,introducing carbon dioxide into water, soaking, filtering, and drying to obtain the dispersion type gas permeable brick for ladle. The prepared gas permeable brick has an excellent performance on resisting slag corrosion and thermal shock, and the breathability and mechanical properties are also very good.

The invention relates to an anti-sticking sand casting coating and a preparation method thereof, and belongs to the technical field of casting. According to the anti-sticking sand casting coating andthe preparation method thereof, a refractory aggregate is selected, an irreversible phase change is generated at a relatively low temperature and large expansion is generated, so that the surface of powder particles in a coating layer sintering shell is sintered more sufficiently, and the particles are in general adhesion due to surface fusion; the coating layer is in a glassy state, the gap of the coating layer is less, the density is higher, the shielding effects of element migration and diffusion are stronger, high-viscosity square quartz generated during high-temperature transformation canresist permeation of metal liquid, and the defect of mechanical sand sticking of castings can be prevented; and the line shrinkage coefficient differences between the glass state coating layer and the casting metal are also large after cooling, the cutting stress of the interface between the casting and the coating layer is increased, so that the coating layer and the casting are peeled off automatically, so that a casting with a smooth surface is obtained; and the thermal chemical stability of a generated mullite phase is high, the generated mullite phase is not easy to react with acid and alkaline oxides, and the prevention of the chemical sand sticking defects of castings is facilitated.

The invention relates to a low-density high-strength andalusite fracturing propping agent and a production method thereof. The raw materials comprise: 65-75% of bauxite raw meal, 2-20% of andalusite, 5-20% of kaolinite, 1-8% of calcium aluminate cement, 3-10% of manganese ore powder. The production method comprises the following steps: weighing raw materials, grinding into fine powder, sieving, well mixing, adding into a rotating granulator for granulation, adding atomized aqueous vapor till the mixture becomes a spherical semifinished product, drying; sintering the semifinished product in a rotary kiln for 6-10 h with a kiln head temperature of 1300-1400 DEG C and a kiln tail temperature of 280-320 DEG C, taking the product out of the kiln to obtain a finished product. The product of theinvention has broken rates of 4.8% and 6.9% under pressures of 52 MPa and 69 MPa respectively, and has strength higher than that of other products of the same kind; the product has bulk density of 1.40-1.60 g/cm3, and apparent density of 2.60-2.85 g/cm3, and the density is lower than industrial standard; the product has high surface fineness, and can effectively reduce cost of petroleum fracturing.

The invention relates to the technical field of ceramic products and specifically relates to a hydrophobic porous ceramic product and a preparation technology thereof. The hydrophobic porous ceramic product comprises a green body and a glaze material; the green body comprises the following raw materials in parts by weight: 27 parts of silicon nitride, 16 parts of zirconium dioxide, 12 parts of clay, 24 parts of aluminum silicate, 16 parts of cordierite, 19 parts of silicon carbide, 14 parts of kieselguhr, 11 parts of albite, 18 parts of aluminum oxide and 13 parts of fluxing agent; the glaze material comprises the following raw materials in parts by weight: 21 parts of dolomite, 23 parts of silicon carbide, 14 parts of calcium oxide, 17 parts of potassium feldspar, 5 parts of clay and 2 parts of sodium hexametaphosphate. The preparation technology comprises the following steps: modifying raw materials of the green body; injection-molding; de-waxing and biscuit-firing; glazing; sintering. The technology provided by the invention is simple and is suitable for large-scale production. The produced ceramic product has the advantages of high mechanical strength, porous hydrophobic property and high temperature resistance.

The invention discloses a sintering heat preservation device, a sintering machine and a sintering method thereof, and belongs to the field of sintering equipment. The heat preservation device comprises a heat preservation cover with an upper opening and a lower opening, a heat exchanger is arranged in the heat preservation cover, the upper opening of the heat preservation cover is sealed, and theheat exchanger is used for preheating the outer air entering the heat preservation cover during sintering operation; and the heat preservation device can fully utilize the heat dissipated by the sintering material surface to form a gradually-reduced trapezoidal temperature field, and the oxygen supply uniformity of the cross section of a sintering trolley is improved, so that the sintering qualityof the upper part of the sintering material layer is improved, and the ore return rate is reduced. The sintering machine comprises the sintering trolley, a ignition furnace and the heat preservationdevice, the sintering machine can supply sufficient oxygen to the sintering material layer while preserving heat, and the quality of the upper part of the sintering material layer and the uniformity of the sintering cross section are improved. According to the sintering method, the above sintering machine is adopted, through setting a reasonable sintering process, the sintering material surface can be ensured to be slowly and uniformly cooled in an environment with sufficient oxygen, the sintering is uniform, and the sintering quality is improved.

The invention discloses a method for preparing lithium iron phosphate in a batch-type high-vacuum dynamic sintering mode. The method includes: adopting a batch-type rotary furnace to heat a precursor of the lithium iron phosphate, performing sealing treatment on a furnace head and a rotary portion through a sealing pad and high-temperature-resisting vacuum fat, vacuumizing the rotary furnace during heating, and pumping oxidizing gases and steam generating in the sintering process quickly, wherein the vacuum degree is kept to be 10<2>-10<12> pa, the furnace body is rotated continuously, the heating temperature is 300-900 DEG C, the heating hour is 5-15h; stopping a vacuum pump and a pumping valve after heating is finished, leading in inert gases into the rotary furnace, and taking the product out after cooling. The prepared precursor of the lithium iron phosphate is fed into the batch-type rotary furnace for vacuum sintering, the high-vacuum state is kept by fast vacuumizing the furnace body through the multi-stage vacuum pump during the whole process, and powder materials rotate along with the furnace body to achieve the aim of dynamic sintering, so that the method for preparing lithium iron phosphate in the batch-type high-vacuum dynamic sintering mode is suitable for preparing lithium ion positive pole materials in industrial mode.

The invention discloses a vanadium-titanium concentrate powder thick material layer sintering technology. The vanadium-titanium concentrate powder thick material layer sintering technology comprises the following steps that sintering raw materials are mixed to be uniform, and the sintering raw materials comprise, by weight, 50-60 parts of vanadium-titanium concentrate powder, 5-8 parts of iron oreconcentrate powder, 10-20 parts of a fluxing agent and 3-5 parts of fuel; the sintering raw materials are crushed; the powder is infiltrated with water and then prepared into pellets; the pellets aredistributed on sintering equipment, and the distributing thickness is 720-740 mm; the pellets are sintered into pellet ore; and the pellet ore is cooled. By changing the component proportion of the sintering raw materials and adding the fluxing agent to improve the air flow fluidity, therefore, the large sintering material distributing thickness is achieved, and the sintered ore quality is improved.

The invention discloses a high-nickel ternary single crystal material and a preparation method thereof. The preparation method includes the steps that after a material precursor synthesis process is controlled and a precursor is subjected to smashing and grading treatment, the precursor and a lithium source are mixed and then subjected to low-temperature dehydration to obtain a pre-oxide, and thenthe pre-oxide is subjected to high-temperature sintering through a dynamic rotary furnace to obtain the high-nickel ternary single crystal material. Compared with a traditional synthesis method, themethod has the advantages that the internally loose and porous precursor can be rapidly synthesized, the specific surface area of the reaction of the material and the lithium source is increased through crushing and grading, the lithiation ratio of the lithium source to the precursor can be effectively reduced, and the usage amount of the lithium source is reduced; the sintering temperature can bereduced, the sintering time is shortened, the energy consumption is reduced and the production efficiency is improved; and meanwhile, sintered material particles are dispersed uniformly, agglomeration is less, and post-treatment processing is relatively easy. The high-nickel ternary single crystal material prepared by the method has the characteristics of full primary particle form, uniform dispersion, complete crystal form, stable structure, excellent electrochemical performance and the like.

The invention discloses an aluminum-coated precursor and a preparation method thereof. The chemical formula of the aluminum-coated precursor is xMCO3(1-x)Al(OH)3, M is at least one of nickel, cobalt and manganese, and x is 0.995-0.999. The aluminum-coated precursor has the advantages of controllable particle size, uniform particle size distribution, high degree of sphericity, smooth particle surface, high tap density, low possibility of breakage and excellent electrochemical performance and energy density, and meanwhile, a positive electrode material prepared from the precursor has relativelyhigh specific capacity and excellent cycle performance and electrochemical discharge performance.

The invention discloses glaze capable of increasing brightness and a preparation process of the glaze, and relates to the technical field of porcelain craft glaze. The glaze is prepared from, by weight, 5-10 parts of modified feldspar powder, 4-8 parts of barite powder, 10-20 parts of modified mica powder, 10-20 parts of modified quartz sand, 1-3 parts of barium oxide, 2-4 parts of zinc oxide, 0.6-1 part of sodium hexametaphosphate, 2-4 parts of zirconium silicate, 2-4 parts of manganese carbonate, 1-3 parts of modified asbestos wool, 5-10 parts of titanium dioxide, 1-3 parts of celestite, 2-6parts of lithia, 1-3 parts ofbastnasite, 1-3 parts oftantalum pentoxide, 1-3 parts of bprpm trioxide, 0.5-1 part ofhafnium oxide, 1-3 parts of modified nano calcium carbonate and 1-3 parts of modified glass fiber. The glaze has the beneficial effect that the brightness of the glaze can be improved.

The invention discloses a sintering bearing plate and a sintering method of a planar ceramic target material. The burning bearing plate comprises a supporting surface and a horizontal plane, wherein the supporting surface is an inclined plane forming an inclination angle with the horizontal plane, the inclination angle of the supporting surface relative to the horizontal plane is 10-30 degrees, and the supporting surface is provided with a plurality of strip-shaped corrugated protrusions which are evenly distributed at intervals and are parallel to one another. A planar ceramic target materialgreen body is placed on the burning bearing plate with the strip-shaped corrugated bulges on the inclined surface for sintering, air permeability of a target material is improved, sufficient sintering of the target material can be promoted, the inclination angle of the supporting surface of the sintering bearing plate relative to the horizontal plane is 10-30 degrees, the friction force between atarget material green body and the sintering bearing plate due to shrinkage during sintering can be greatly reduced, target material densification is facilitated, defects of deformation, cracking andthe like of the target material are prevented, and the yield of the target material is greatly increased.

The invention discloses a sintering technology for a quartz sand furnace lining of an induction electric furnace of 1t or below. The sintering technology comprises the following steps that firstly, burden is heated to 875 DEG C-1,100 DEG C at the average temperature rise speed of 300 DEG C/h, and heat preservation is conducted for 4 h; secondly, the burden is melted at the average temperature risespeed of 250 DEG C/h, the temperature of molten iron is increased to 1,500 DEG C-1,560 DEG C, and heat preservation is conducted for 2h; thirdly, the temperature of the molten iron is reduced to 1,400 DEG C to 1,450 DEG C, and heat preservation and curing are conducted for 1h; fourthly, after the furnace lining is sintered, according to the burden adding manner during daily smelting, three wastesteel press blocks are added, then a carburant is added, and the rest of waste steel press blocks are added for supplementary. The total consumed time of the sintering technology is about 12.5 h, andcompared with the previous sintering technology consuming 18 h and the burden adding manner, the sintering efficiency is improved by 31%, and the service life of the furnace lining is prolonged by 40%. The sintering technology is applied to the casting field, and a practical basis is provided for further improving and enhancing of the sintering technology for the quartz sand furnace lining of theinduction electric furnace.

The invention relates to environment-friendly type long-life fettling sand, which is prepared from the following raw materials (by weight): 65-90 parts of sintered magnesia, 12-20 parts of a composite carbon source composed of carbon-containing resin powder and carbon black, 0.01-0.20 part of pitch fiber, 2.5-4.5 parts of a composite fluidizing reagent composed of refined naphthalene and allyl polyethenoxy ether, 0.2-1.5 parts of a composite sintering agent composed of silicon carbide micro-powder and borax, and 2.0-5.5 parts of a composite antioxidant composed of metallic aluminum powder and metallic silicon powder. In comparison with the prior art, the invention has the following beneficial effects: sintering time is short; scour resistance and spalling resistance are greatly improved; especially the environmental protection effect is prominent; smoke amount is obviously reduced; there is no peculiar smell; total service life is raised by 25-32%; fettling time is reduced; labor intensity is lowered; and win-win relationship between steel mills and refractory suppliers is realized.

The invention provides a coating material for high-temperature oxidation prevention of a carbon anode. The coating material comprises the following components: 35-55 wt% of an inorganic binder, 30-60 wt% of a composite ceramic filler, 1-10 wt% of a catalyst, 0-1 wt% of a sintering agent and 1-10 wt% of a flexibilizer. The coating material disclosed by the invention has good toughness, relatively strong binding force and relatively strong thermal shock resistance, has the characteristics of convenience in construction, normal-temperature curing, low-temperature densification, no toxicity, environment friendliness, durability, effectiveness and the like, and can be used for remarkably reducing the high-temperature oxidation burning loss of a carbon anode and prolonging the service life of the anode.