682 results about "Slurry coating" patented technology

A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO₂, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N₂O was not detected (detection limit: 0.6 percent N₂O).

A method of protecting an article from a high temperature environment, the method includes providing a substrate comprising silicon, forming a slurry coating composition, wherein the composition comprises a metallic silicon powder, a rare-earth oxide, an alkaline earth metal oxide, an aluminum oxide, or a combination comprising at least one of the foregoing, and a binder effective to chemically stabilize the slurry coating, applying a layer of the slurry coating over the substrate, and heat-treating the slurry coating under conditions sufficient to oxidize the metallic silicon powder and form an alkaline earth metal aluminosilicate, a rare-earth silicate, an aluminum silicate, or a combination comprising at least one of the foregoing bonded to the substrate.

A slurry and slurry coating process for forming a diffusion aluminide coating on a substrate, including internal surfaces within the substrate. The process involves preparing a slurry of a powder containing a metallic aluminum alloy having a melting temperature higher than aluminum, an activator capable of forming a reactive halide vapor with the metallic aluminum, and a binder containing an organic polymer. The slurry is applied to surfaces of the substrate, which is then heated to burn off the binder, vaporize and react the activator with the metallic aluminum to form the halide vapor, react the halide vapor at the substrate surfaces to deposit aluminum on the surfaces, and diffuse the deposited aluminum into the surfaces to form a diffusion aluminide coating. The process can be tailored to selectively produce an inward or outward-type coating. The binder burns off to form an ash residue that can be readily removed.

The invention discloses a surface anti-oxidation processing method for an aircraft carbon brake disc, which comprises the following steps: firstly, coating a layer of phosphate coating solution on the surface of a material needing to be processed, and forming a bottom phosphate coating through high temperature heat treatment; secondly, coating a layer of slurry coating which uses refractory ceramic powders as the main raw material and uses the phosphate coating solution as solution on the surface of the bottom phosphate coating; and finally forming a composite coating through the high temperature heat treatment. The composite coating of the invention has anticatalytic effect, and can improve the high temperature anti-oxidation capacity of C/C composite materials, such as the aircraft carbon brake disc and the like, under the condition of sea or salt spray pollution; and the ceramic component in the composite coating is melted and flows at high temperature so as to effectively heal the crackles in the coating, delay the time that oxygen is contacted with C/C materials, and improve the oxidation resistance of the composite coating.

The invention relates to a method for directly making a hollow blade ceramic mold based on a photo-curing process. The method is as follows: firstly, ceramic powder and pre-mix liquid are evenly mixed so as to make ceramic slurry; secondly, according to a hollow blade model, a hollow blade mold model containing a gating system is obtained, and the ceramic slurry is directly made into a ceramic mold biscuit on a photo-curing forming machine according to the hollow blade mold model; then, the ceramic mold biscuit is dewatered to obtain a dry ceramic mold; finally, the dry ceramic mold is placed in a high-temperature baking furnace so as to carry out degreasing and sintering, thereby making the hollow blade ceramic mold. The ceramic mold can be used in the casting of a hollow blade, and replaces a multi-layer ceramic shell and core manufacturing process adopted in the prior investment casting. The method does not need the processes of investment pattern making, slurry coating and sand spreading adopted in the prior process, and has the characteristics of simple process, short cycle, low cost and quick returns, etc.

The invention discloses a preparation method of a honeycomb carrier catalyst for molecular sieve denitration. The preparation method comprises the following steps: 1, preparing a Cu/ZSM-5 catalyst which contains 1.5%-2.5% by weight of Cu by adopting an ion exchange method; 2, pretreating and drying a cordierite honeycomb ceramic carrier under the conditions of acid-base and an organic solvent; 3, preparing slurry, wherein the mass ratio of an adhesion agent to Cu/ZSM-5 catalyst to ethanediol to deionized water is (0.2-0.3):1:1.165:1.165 in the slurry; 4, preparing a primary coating honeycomb carrier denitration catalyst; and 5, preparing a secondary coating honeycomb carrier denitration catalyst. The honeycomb carrier catalyst prepared through the method disclosed by the invention is difficultly plugged in a slurry coating process, firm in coating and high in stability; the prepared honeycomb carrier catalyst is high in denitration efficiency, achieves the denitration efficiency more than 90% at a temperature interval of 170-500 DEG C and can be widely applied to the catalytic reduction of nitrogen oxide in a motor vehicle tail gas post-processing system.

A single step, in situ curing method for making gel polymer lithium ion rechargeable cells and batteries is described. This method used a precursor solution consisting of monomers with multiple functionalities such as multiple acryloyl functionalities, a free-radical generating activator, nonaqueous solvents such as ethylene carbonate and propylene carbonate, and a lithium salt such as LiPF₆. The electrodes are prepared by slurry-coating a carbonaceous material such as graphite onto an anode current collector and a lithium transition metal oxide such as LiCoO₂ onto a cathode current collector, respectively. The electrodes, together with a highly porous separator, are then soaked with the polymer electrolyte precursor solution and sealed in a cell package under vacuum. The whole cell package is heated to in situ cure the polymer electrolyte precursor. The resulting lithium ion rechargeable cells with gelled polymer electrolyte demonstrate excellent electrochemical properties such as high efficiency in material utilization, high Coulombic efficiency, good rate capability, and good cyclability.

The invention discloses a method for making a super-high temperature resistant ceramic coating. The method adopts organic polymer as adhesive and mixed powder consisting of high melting metal powder, B powder, C powder and Si powder as raw materials; moreover, through adopting processes such as preparing slurry used in a coating, slurry coating, precoating curing, high-temperature reaction sintering, a super-high temperature resistant ceramic coating is finally made on the surface of a ceramic matrix composite material. The coating making process is simple and has low cost; the made coating has ideal bonding performance with a substrate and has excellent ablation resistance and antioxidation, thereby laying the foundation for the application of a ceramic matrix composite material in the super-high temperature resistant and antioxidation fields.

The invention relates to a preparation method of an anti-oxidation coating, which belongs to the field of coating material preparation. In the invention, a composite material is taken as a basal body, and the coating comprises the following main components: a SiC phase, a free Si phase and an M phase, wherein the M phase is an MoSi2, WSi2 and TaSi2 single ceramic phase or a multiple ceramic mixing phase; the thickness of the coating is about 20mu m to 600mu m; the coating adopts a process for preparing the coating by a slurry coating-liquid phase ihrigizing in-suit reaction method; the coating system has wide application range, and contains the whole Si ceramic coatings; and the invention effectively control the thickness and the components of the coating by means of the slurry solid content and slurry coating frequency, thereby meeting the in-service use requirements.

A slurry coating composition is described, which is very useful for enriching the surface region of a metal-based substrate with aluminum. The composition includes colloidal silica and particles of an aluminum-based powder, and is substantially free of hexavalent chromium. The slurry may include colloidal silica and an alloy of aluminum and silicon. Alternatively, the slurry includes colloidal silica, aluminum or aluminum-silicon, and an organic stabilizer such as glycerol. The slurry exhibits good thermal and chemical stability for extended periods of time, making it very useful for industrial applications. Related methods and articles are also described.

The invention relates to a method for preparing a coating reinforced C/SiC composite material. According to a technical scheme, a slurry coating layer is coated on a test sample surface of a C/SiC composite material to facilitate the filling of aperture gaps remained by a prefabricated body structure and aperture gaps caused by a chemical vapor infiltration bottle neck process, so that the compactness of the composite material is improved, the modulus mismatching between the C/SiC composite material and a SiC protective layer can be effectively relieved and the obdurability of the composite material is improved. Compared with the C/SiC composite material in the prior art, the coating reinforced C/SiC composite material has the advantages that the bending strength of the two-dimensional SiC crystal whisker coating layer reinforced C/SiC composite material is 480-502MPa under the room temperature, the bending strength of the two-dimensional SiC particle coating layer reinforced C/SiC composite material is 440-470MPa, and the bending strength of the two-dimensional (SiC crystal whisker and SiC particle) coating layer reinforced C/SiC composite material is 485-515MPa. The thicknesses of PyC and SiC basal bodies and a protective layer are controlled by controlling deposition time, and the thickness of the slurry coating layer is controlled by controlling the viscosity of the slurry and the coating time the number of coatings so as to realize the control of the composite material structure.

The invention relates to a preparation method of thin-shelled noble metal catalyst, and mainly solves the problems of the prior art of high dosage, poor selectivity and short service life of noble metal. The preparation method better solves the technical problems of the prior art by adopting the technical proposal comprising the following steps of: (a) coating the slurry of a coat porous material on the inner core of an inert carrier, drying the slurry coating and baking the slurry coating at a temperature of between 700 and 1,200 DEG C for 0.5 to 10 hours to obtain a laminar composite carrier; (b) impregnating the surface of the laminar composite carrier with a solution containing noble metal and cocatalyst components, drying the laminar composite carrier, and baking the laminar composite carrier in the air at a temperature of between 200 and 700 DEG C for 1 to 24 hours to obtain a thin-shelled catalyst precursor; and (c) reducing the thin-shelled catalyst precursor in a reducing atmosphere at a temperature between 300 and 800 DEG C for 1 to 24 hours to obtain the thin-shelled noble metal catalyst. The preparation method can be used in the industrial production of gas purification materials which are dehydrogenation-deoxidization catalysts, alkanes and aromatic hydrocarbons for selective hydrogen oxidation in a dehydrogenation process.

The invention discloses a lithium battery formed on the basis of lithium nickel manganese oxide and lithium titanate and a preparation method of the lithium battery. The lithium battery comprises an aluminum-plastic film casing, an anode lug, a cathode lug and a tab film, wherein the aluminum-plastic film casing contains a battery cell and electrolyte; the battery cell comprises an anode piece, a diaphragm and a cathode piece; materials of the anode piece comprise an anode slurry coating consisting of a positive active material, a binding agent, a conductive agent and a solvent and an anode current collector; the positive active material adopts an Al2O3 coating of lithium nickel manganese oxide; the binding agent adopts one or two of polyvinylidene fluoride and polytetrafluoroethylene; the conductive agent adopts one or more of conductive carbon black, conductive graphite and carbon nanotubes; the solvent adopts N-methyl-2-pyrrolidinone; the anode current collector adopts an aluminum foil; the cathode piece adopts an aqueous cathode or an oil-based cathode. According to the designed lithium battery, the purposes of improvement of the reversible specific capacity, the energy density and the rapid charge-discharge capability, the cycle performance and the safety performance of the battery are achieved while the production cost is reduced.

The invention discloses a preparation method of a catalyst for catalytic combustion of organic exhaust gas. The method comprises the following steps of: firstly carrying out ultrasonic pretreatment on a honeycomb ceramic matrix in a pretreatment fluid, then loading a nanometer slurry coating, and finally loading an auxiliary agent and a precious metal active component. The catalyst obtained by the adoption of the method has high bonding degree between the coating and the matrix, and is not easy to crack and spall. Therefore, the catalyst has good service performance and good active stability. Even under scouring and thermal shock of an air flow at high space velocity, the catalyst can still maintain high activity so as to guarantee long-term stable operation of the catalyst.

The invention discloses the nanometer stannic oxide antistatic coating and preparing method. The invention modifies the nanometer ATO with surface processing agent, reducing the surface free energy and improving ATO dispersity. The slurry coating has network structure after film curing, so it has good electrical conductivity. The coating material can be used in skin layer of high molecular synthetic material, and it has electrostatic resistance action.

A ultraviolet light solidified aluminium silver slurry coating consists of acrylic resin 20-50wt%, acrylic ester monomer 10-50wt%, light initiating agent 3-10wt%, aluminium silver slurry 2-15wt%, aluminium silver slurry orienting agent 4-15wt%, assistants 0.3-2.5wt% and solvent 15-30wt%. It achieves fast curing speed, less organic volatile substances, higher production efficiency, better adhesion, hardness and abrasive-resistant performance.

The invention relates to the technical field of lithium ion batteries, in particular to a current collector, a preparation method of the current collector and a lithium ion battery comprising the current collector. The current collector comprises a two-layer coating which includes a conductive slurry coating and a conductive polymer PEDOT (poly(3,4-ethylenedioxythiophene)):PSS (poly(styrenesulfonate)) coating from inside to outside. The two-layer coating of the current collector has high electrical conductivity at the room temperature, and the electrical conductivity is reduced abruptly at a high temperature. When thermal shock, over-charging and short-circuited failure happen to the lithium ion battery using the current collector, the temperature rises to be higher than 100 DEG C abruptly, the electron conductivity of the two-layer coating is reduced abruptly, transmission of electrons on the current collector is quickly and effectively limited, an electron source for reactions in the battery is cut off, and in-site overheat protection is provided for the battery in time.

Slurry coating process for selectively enriching surface regions of a metal-based substrate, for example, the under-platform regions of a turbine blade, with chromium. The process employs a slurry coating composition containing metallic chromium, optionally metallic aluminum in a lesser amount by weight than chromium, and optionally other constituents. The composition further includes colloidal silica, and may also include one or more additional constituents, though in any event the composition is substantially free of hexavalent chromium and sources thereof. The coating composition is applied to a surface region to form a slurry coating, which is then heated to remove any volatile components of the coating composition and thereafter cause diffusion of chromium from the coating into the surface region to form a chromium-rich diffusion coating.

The invention discloses a method for synthesizing a molecular sieve membrane, which adopts a mode of crystal seed coating by a crystal seed slurry coating method for the synthesis of the molecular sieve membrane. A sol with a composition similar to that of a synthetic fluid for synthesizing the molecular sieve membrane is prepared, and the sol is mixed with molecular sieve crystals and water according to a certain proportion to prepare a crystal seed slurry; a supporting body is soaked with water, and after the surface of the supporting body is dried in the air, the crystal seed slurry is coated on the surface; when the surface is almost dry, the coating is strickled and dried to obtain a supporting body with a crystal seed layer; finally the molecular sieve membrane is synthesized by a hydrothermal synthesis method. The crystal seed layer prepared by the invention can eliminate possible defects on the supporting body surface, is distributed uniformly, and is not easy to be erased from the supporting body surface, so the synthesized molecular sieve membrane has a continuous and dense surface, excellent separation performance, good repeatability, and is applicable to large-scale production.

The invention relates to a preparation method of a shell mold for investment casting of a TiAl based alloy, and belongs to the technical field of precision casting. The preparation method comprises the following steps that: firstly, ZrO2 and zirconia sol are prepared into a slurry; after the slurry is coated with a wax pattern, ZrO2 sand with a particle degree of 120 to 180 meshes is spread; Al2O3 and ethyl silicate hydrolyzate are prepared into a slurry, and then after the slurry is coated with a mold shell, Al2O3 sand with a particle degree of 60 to 90 meshes is spread, the slurry coating and the sand spreading are repeated for several times, the sand is Al2O3 sand with the particle degree of 40 to 50, 20 to 30, and 6 to 10 meshes sequentially, and drying is carried out; and dewaxing and roasting are carried out. The preparation method has the advantages that: the strength of the mold shell is sufficient, the production cycle is short, the quality of the inner surface of the mold shell is good, the reaction between TiAl based alloy castings and the mold shell is small after casting, and the castings have high surface quality.

Disclosed is an emulsified SBS modified pitch and the preparing method, belonging to the technology field of pitch modifying and emulsifying processing. The stock comprises base pitch, modifier, emulsion made by emulsifier and water; the invention is characterized in that the said modifier is macromolecular polymer thermoplastic rubber SBS in solid state, the consumption is 1~8% of the base pitch in mass; and said emulsion is 50~100% of the base pitch in mass. The method comprises putting the SBS into pitch to get the modified pitch, feeding the modified pitch and emulsion into emulsifier for emulsion and getting the emulsified SBS modified pitch. The invention is characterized by the reasonable formulation and the improvement in the low temperature resistance, high-temperature resistance, elastic recovery ability and the increase in binding strength and the engineering application in slurry coating etc.

Relating to plating of metal materials, the invention provides a method for preparation of nano-modified amorphous ceramic coating on a metal matrix ceramic coating. The method includes the steps of: subjecting nano Y-ZrO2 powder and amorphous ceramic mixed powder composed of 1.0-15.0% of B2O3, 1.0-10.0% of Al2O3, 7.0-10.0% of CaO, 1.0-3.0% of MgO, 4.5-6.5% of K2O, 8.0-10.0% of Na2O and the balance SiO2 to wet mixing in a ball mill for 20min, then conducting drying to obtain a mixture of nanocrystalline ceramics and amorphous ceramic mixed powder, blending the mixture with water in a mass ratio of 1:1-5:3 to form a slurry, spray brushing the slurry onto the metal matrix ceramic coating surface of a workpiece by slurry jetting or slurry coating, and finally performing sintering to form the nano Y-ZrO2 modified amorphous ceramic coating, which has a low through hole rate and can resist 650DEG C high temperature liquid zinc corrosion.

The present invention relates to a chemical mechanical polishing device, and a method and a system of polishing a wafer, wherein the chemical mechanical polishing device for processing the wafer includes a plate for supporting the wafer to be processed in a face-up orientation; a polishing head opposing the plate, wherein the polishing head includes a rotatable polishing pad operable to contact the wafer while the polishing pad is rotating; and a slurry coating system providing a slurry to the polishing pad for polishing the wafer. By means of the invention, it is possible to perform a chemical mechanical polishing process to the face-up wafer; thereby, it is possible to reduce bending degree of the wafer and generate a better whole plainness degree so as to save a process window time of a scanner, it is also possible to reduce chemical reaction time so as to reduce dish-shaped appearance generation or corrosion in micro-shadow treatment. Furthermore, the wafer is faced upwards, such that it is possible to monitor the surface of the in-site wafer simply to implement accurate polishing control so as to be more practical.

The invention discloses a carbon-ceramic coated aluminum foil current collector and a preparation method therefor. At least one surface of the current collector aluminum foil is coated with a slurry coating layer which contains ceramic and a carbon material; the slurry comprises the following components based on weight percentage: 1-20% of film forming agent, 1-5% of ceramic particles,1-20% of carbon material, 0.5-20% of dispersing agent, 0.5-4% of coupling agent, 40-95% of solvent, 0-0.3% of defoaming agent and 0-0.5% of base material wetting agent. The carbon-ceramic coated aluminum foil current collector has relatively high solvent resistance and low resistance; the current collector has high compatibility with the positive electrode slurry which takes N-methyl pyrrolidone as the solvent; the current collector is tight in adhesion; and in addition, the current collector has the advantages of excellent stability, high adhesive power, low internal resistance, high specific capacity, high rate capability and the like in use.