19 results about "Chromium(III) oxide" patented technology

The invention relates to the technical field of dyes, in particular to an acid black dye with green light and a preparation method thereof.The preparation method comprises the steps that a front color base I and a front color base II are synthesized firstly, then the front color base I and chromic oxide are complexed to obtain a reaction solution I, then the front color base II is added into the reaction solution I, and the acid black dye with the green light is prepared. The preparation method is simple and environment-friendly, a dye compound A, a dye compound B, a dye compound C and a dye compound D are formed by complexing a front color base I, a front color base II and chromium ions, and then the adding amount proportion of the front color base I, the front color base II and the chromium ions is adjusted; the ratio of the dye compound A to the dye compound B to the dye compound C to the dye compound D is adjusted, the green and full acid black dye is prepared, and the obtained acid black dye with green light is excellent in color fastness.

This invention provides a high-entropy alloy nano-coating high-temperature oxidation-resistant modification preparation process, belonging to the field of coating modification technology. The high-entropy alloy nano-coating high-temperature oxidation-resistant modification preparation process specifically includes the following steps: S1. Target material selection and preparation; S2. Alloy substrate treatment; S3. Low-temperature nanocrystalline coating deposition; S4. Coating densification treatment; S5. Low-temperature recovery annealing; S6. Pre-oxidation treatment. Through the synergistic process of low-temperature preparation of the alloy nano-coating, densification annealing, and pre-oxidation, the high-temperature strength and phase stability of the coating are improved by utilizing the lattice distortion effect. A thermodynamically stable protective oxide film of aluminum oxide and chromium oxide is generated in situ on the surface, solving the problems of traditional chromium-based coatings such as few main components, poor oxidation resistance, and short lifespan. This significantly improves the service reliability and safety of nuclear reactor structural materials under high-temperature irradiation environments.

The invention relates to the field of refractory materials, in particular to a high-erosion-resistance refractory material based on boron nitride modification and a preparation method of the high-erosion-resistance refractory material. The problem that an existing refractory material is poor in erosion resistance is solved. The refractory material is prepared by taking zirconium dioxide, silicon dioxide, calcium oxide, ferric oxide and aluminum oxide as matrixes and adding samarium lanthanum magnesium aluminum composite gel powder and boron nitride loaded chromium sesquioxide, magnesium nitrate, aluminum nitrate, samarium nitrate, lanthanum nitrate and citric acid form gel, high-temperature treatment is performed to obtain the samarium lanthanum magnesium aluminum composite gel powder, and the samarium lanthanum magnesium aluminum composite gel powder is added to the boron nitride loaded chromium sesquioxide. Boron nitride is loaded with chromium sesquioxide after being treated by tannic acid, the corrosion resistance of the material is enhanced through the synergistic effect of all the components, and the material is suitable for high-temperature furnaces, high-temperature reactors and other industrial environments needing high-temperature resistance and high corrosion resistance.

The invention discloses a ferrochrome liquid decarburization method based on partial roasting and step-by-step vacuum, and belongs to the technical field of ferroalloy smelting. During operation, only part of ferrochrome raw materials and powder need to be ground into powder and roasted into the endogenous oxidizing agent mainly comprising chromic oxide; then, in a vacuum induction furnace, the blocky ferrochrome and part of the oxidizing agent are molten to form a liquid molten pool, the oxidizing agent reacts with carbon in the melt through the process of combining step-by-step stepped vacuumizing and adding of the remaining oxidizing agent in batches, generated CO is rapidly pumped away by a vacuum system, and therefore deep decarburization is achieved. The method effectively solves the technical bottlenecks that a traditional oxygen blowing method cannot produce micro-carbon ferrochrome, and a vacuum solid-state method is tedious in raw material treatment and too long in decarburization period.

This invention discloses a ceramic clay composition, ceramics, and their applications, relating to the field of ceramic technology. The ceramics of this invention are obtained by sequentially processing the ceramic clay composition through a process of material conditioning, sieving, casting, air drying, oven drying, and sintering. The introduction of specific proportions of ceramic waste A and B, modified particles with a gallium-coated cuprous oxide core and an alumina shell, and high-entropy oxide solid solutions generated from the reaction of hafnium dioxide, tantalum pentoxide, niobium pentoxide, titanium dioxide, zirconium dioxide, chromium trioxide, and carbon powder, as well as chromium heptacarbonide, into the ceramic clay composition gives the ceramics prepared from the ceramic waste excellent fracture toughness, flexural strength, wear resistance, high-temperature resistance, and self-healing ability. Therefore, this invention has broad application prospects.

The invention relates to the field of resistor discs, and particularly discloses a metal oxide resistor disc and a preparation process thereof, and the preparation process comprises the following steps: S1, mixing zinc oxide, antimony trioxide, chromium sesquioxide, manganese dioxide, aluminum nitrate and silver nitrate to prepare a slurry, adding a surface modifier, and mixing to prepare a mixed slurry; s2, drying the mixed slurry to obtain prefabricated powder, pre-sintering the prefabricated powder to obtain a pre-sintered mixture, grinding the pre-sintered mixture, and drying the ground pre-sintered mixture to obtain additive composite powder; s3, manganese carbonate, bismuth trioxide, nickel oxide and cobaltosic oxide are mixed to serve as an additive mixture, a tin dichloride solution is added, and a mixed solution to be deposited is prepared after stirring; s4, mixing the to-be-deposited mixed solution with an adhesive, absolute ethyl alcohol and additive composite powder, then drying, carrying out compression molding, and then carrying out calcination treatment; and S5, performing post-treatment to obtain the metal oxide resistor disc. The resistor disc has the advantages that the porosity of the resistor disc is reduced, the through-flow capacity is improved, and the electrical performance is improved.

The invention belongs to the technical field of preparation of nano metal ceramic composite powder, and particularly relates to superfine-grained thermal spraying powder and a preparation method thereof.The preparation method of the superfine-grained thermal spraying powder comprises the following steps that S1, a first carbon blending material and a second carbon blending material are obtained, the first carbon blending material comprises chromic oxide and carbon black, and the second carbon blending material comprises chromium oxide and carbon black; the second carbon blending material comprises nano tungsten powder and carbon black; s2, the first carbon blending material and the second carbon blending material are mixed and then subjected to high-temperature carbonization, and tungsten-chromium composite powder is obtained; s3, tungsten-chromium composite powder, cobalt powder, deionized water and a forming agent are mixed and then subjected to ball milling, spray drying granulation, sintering and crushing, and superfine nanocrystalline thermal spraying powder is obtained; in the process of preparing the tungsten-chromium composite powder, the addition of chromium can effectively inhibit the growth of tungsten carbide in the carbonization process of the nano tungsten powder, meanwhile, tungsten carbide can inhibit the growth of chromium / chromium carbide, and the tungsten carbide and the chromium / chromium carbide inhibit each other, so that the preparation of the ultrafine-grained powder is realized.

This invention discloses a layered chromium-based cathode material for sodium-ion batteries and its preparation method, wherein the cathode material has the general formula NaCr. 1‑x M x O2, wherein M is Ti, V, Mn, Fe, Co, Ni, Mg, Zn, Ir or Cu, and 0.01≤x<0.1; the cathode material is granular with a particle size of 1-10μm, has a trigonal crystal structure, and exhibits no phase transition characteristics; the preparation process includes mixing sodium salt, chromium trioxide and metal oxide, pressing them into sheets, and then calcining them at 700-1000℃ for 8-12h in an inert atmosphere to obtain a layered chromium-based cathode material for sodium-ion batteries; this invention, by controlling the element ratio and high-temperature sintering reaction conditions, allows the precursors to diffuse into each other at high temperatures to form a continuous solid-state layered structure, thus preparing a sodium-containing trigonal layered oxide, which exhibits no phase transition characteristics during charging and discharging over a wide voltage range, has small volume changes during charging and discharging, and combines excellent electrochemical structural stability with air stability, significantly improving battery cycle life.

This invention discloses a microcrystalline glass, its preparation method, a cover glass, and an electronic device, belonging to the field of new materials. The composition of the microcrystalline glass is as follows (by mass percentage): SiO₂ 60-80%, Al₂O₃ 1-10%, Li₂O 10-18%, ZrO₂ 3-12%, Na₂O 0-5%, CaO 0-4%, P₂O₅ 1-5%, K₂O 0-3%, Cr₂O₃ 0-10%, Fe₂O₃ 0-10%, where Cr₂O₃ and Fe₂O₃ are not both 0 and 1.9wt%≤Cr₂O₃+Fe₂O₃≤10wt%, the crystalline phase contains a crystal phase that produces a gold-like effect. The crystal phase that produces the gold-like effect is chromium trioxide crystal, or iron oxide crystal, or chromite spinel, or chromium trioxide crystal and chromite spinel.

The application relates to the field of electronic materials, and particularly discloses a low-gradient zinc oxide varistor disc and a preparation method thereof; the low-gradient zinc oxide varistor disc comprises the following raw materials in parts by weight: 88-96 parts of zinc oxide, 1.5-3 parts of diantimony trioxide, 2-5 parts of bismuth trioxide, 0.2-1.8 parts of nickel oxide, 0.1-0.9 parts of cobalt trioxide, 0.1-0.4 parts of manganese oxide, 0.02-0.07 parts of chromium trioxide, 0.15-0.18 parts of lithium acetate, 1.2-1.8 parts of a dispersing agent, 1.8-2.5 parts of a binding agent, 0.12-0.15 parts of aluminum nitrate and 0.001-0.003 parts of silver nitrate; under the synergistic action of the components, the use ratio of the components is adjusted, the potential gradient of the varistor disc is reduced, the large-current resistance of the varistor disc is improved, and the change of the electrical performance after impact is reduced.

The application discloses a method for cleaning and reprocessing and resource utilization of waste chrome tanning scraps and application thereof, and belongs to the technical field of solid waste resource utilization. The method is to use a citric acid-EDTA composite cleaning agent to clean and process the leather scraps and separate chromium; a composite enzyme preparation is used to enzymatically hydrolyze the chromium-removed leather residue under high temperature and high pressure to extract collagen; the chromium-containing filtrate is alkalized, precipitated and calcined to recover chromium trioxide; and finally, the enzymatically hydrolyzed residue is blended with a thermoplastic polymer to extrude plastic fillers. The application realizes efficient recovery of chromium and efficient extraction of collagen, and the process is clean and environmentally friendly, without toxic and harmful emissions, so that full-component and high-value utilization of the waste is achieved.

The invention belongs to the technical field of ceramic surface treatment, and particularly relates to a ceramic surface protective agent as well as a preparation method and a use method thereof. The ceramic surface protective agent comprises the following components in parts by weight: 79-92 parts of an aggregate, 2-5 parts of an intermediate, 1-3 parts of an emulsifier, 3-8 parts of zirconium sol, 0.5-2 parts of a nano filler and 1-3 parts of a hardening agent, wherein the condensation body is solid paraffin, the intermediate is glycerol or 1, 2-propylene glycol, the nanometer filling body is a mixture of one or more of zirconium oxide, yttrium oxide and chromic oxide, and the hardening agent is polyethylene wax. The invention aims to develop a novel system ceramic protective agent and a preparation method and a use method thereof, the corrosion resistance of a ceramic plate is greatly improved, and meanwhile, the ceramic protective agent has excellent antifouling performance.

The present application belongs to the technical field of metallurgical equipment maintenance and special refractory ceramics, and discloses a magnesium-carbon brick residual thickness judgment method based on shape change and a magnesium-carbon brick structure. The magnesium-carbon brick is sequentially provided with an initial function section, a warning function section and a dangerous function section along the erosion direction of the working surface, each section adopts different geometric profiles of convex arc surface, parallel plane and concave arc surface, and chromium trioxide is added as a thermal characteristic indicator in the warning section, and boron carbide or yttrium oxide is added as a chemical characteristic indicator in the dangerous section. Through the cooperative design of geometric profile and characteristic indicator, combined with a multi-modal sensing unit, the present application realizes real-time collection, analysis and matching of the geometric and physical state of the inner wall of the furnace lining, can accurately determine the erosion stage and residual thickness grade of the magnesium-carbon brick, significantly improves the functional integration and service safety of special refractory ceramic products, and solves the problems of traditional refractory material thickness measurement, such as dependence on furnace shutdown, detection lag and insufficient precision.

The present application belongs to the technical field of ceramic surface treatment, and particularly relates to a ceramic surface protective agent and a preparation method and use method thereof. The ceramic surface protective agent comprises, in parts by weight, 79-92 parts of a condensate, 2-5 parts of an intermediate, 1-3 parts of an emulsifier, 3-8 parts of a zirconium sol, 0.5-2 parts of a nano filler, and 1-3 parts of a hardening agent. The condensate is solid paraffin, the intermediate is glycerol or 1,2-propanediol, the nano filler is a mixture of one or more of zirconium oxide, yttrium sesquioxide and chromium sesquioxide, and the hardening agent is polyethylene wax. The present application aims to develop a new type of ceramic protective agent and a preparation method and use method thereof, greatly improve the corrosion resistance of ceramic plates, and simultaneously have excellent antifouling performance.

The invention provides a formula and a preparation process of ceramic blue glaze water, and belongs to the field of blue glaze. The formula of the ceramic bluing glaze water comprises the following raw materials in percentage by mass: main materials including 60.1 to 60.88 percent of silicon oxide, 16.34 to 30 percent of aluminum oxide, 0 to 0.28 percent of iron oxide, 0 to 0.82 percent of calcium oxide, 0 to 2.28 percent of magnesium oxide, 0 to 0.1 percent of titanium oxide, 2.2 to 4.94 percent of potassium oxide, 0 to 3.46 percent of sodium oxide and 3 to 5 percent of cobalt oxide; silicon oxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, titanium oxide, potassium oxide, sodium oxide, cobalt oxide, zirconium oxide and chromium sesquioxide are effectively combined as raw materials, so that the sintering temperature of the high-temperature glaze can be controlled at 1000-1100 DEG C, the sintering temperature of an oil material is reduced under the condition that the surface characteristics and performance of the blue glaze are not influenced, and the service life of the glaze is prolonged. Therefore, the purpose of reducing energy consumption is achieved.

The invention belongs to the technical field of glass pigments, and particularly relates to a boron-promoted sintering low-expansion black pigment and a preparation method and application thereof.The black pigment is prepared from, by weight, 1-6 parts of boron compound, 2-12 parts of metal oxide, 0-2 parts of lithium carbonate, 0-5 parts of ammonium heptamolybdate, 10-25 parts of manganese dioxide, 12-35 parts of copper oxide and 45-55 parts of chromic oxide. The preparation method comprises the following steps: weighing the raw materials according to certain parts by weight, transferring the raw materials into a mixer, and uniformly mixing the raw materials; and transferring the mixture into a muffle furnace for calcining treatment, cooling, ball-milling and crushing, and sieving. The black pigment provided by the invention is uniform in particle, the minimum thermal expansion coefficient can reach 68.8 * 10 <-7 > / DEG C, and the black pigment can be applied to household appliances, automobiles and photovoltaic glass, especially high borosilicate and microcrystalline glass.

The application provides an antioxidant low-abrasion heat-resistant steam turbine blade coating and a preparation method thereof, and relates to the technical field of material surface treatment, and comprises the following components in mass ratio: nickel-cobalt-chromium-aluminum-yttrium alloy 20-30 parts, zirconia-yttria-alumina composite ceramic 30-40 parts, hafnium powder and rhenium powder mixture 10-15 parts, chromium sesquioxide 5-10 parts, rare earth oxide 3-5 parts, cerium dioxide 2-4 parts, silicon dioxide 3-5 parts, titanium carbide 5-8 parts, and zirconium boride 2-4 parts; the nickel-cobalt-chromium-aluminum-yttrium alloy and the zirconia-yttria-alumina composite ceramic are used in the application, a stable oxide film can be formed at high temperature, the further diffusion of oxygen is effectively prevented, the rare earth oxide and the cerium dioxide can promote the repair and stability of the oxide film, the antioxidant capacity of the coating is improved, and the blade can maintain good performance in a high-temperature environment for a long time.

The invention provides a method for preparing chromium sesquioxide powder by taking chromium-containing wastewater as a raw material, and belongs to the field of sewage treatment. The method for preparing the chromium sesquioxide powder by taking the chromium-containing wastewater as the raw material comprises the following steps: mixing the chromium-containing wastewater and a pH regulator, carrying out precipitation reaction, and then carrying out solid-liquid separation to obtain a dichromate solution; the pH value of the precipitation reaction is 2-4; after the dichromate solution flows through weak base anion resin to be treated, hexavalent chromium adsorption saturated resin is obtained; ammonia water is adopted to analyze the hexavalent chromium adsorption saturated resin, and a mixed solution is obtained; the mixed solution is a mixed solution of ammonium chromate and ammonium dichromate; the mixed solution is sequentially subjected to evaporation concentration, spray drying and calcination, and chromium sesquioxide powder is obtained. The method provided by the invention is simple in preparation steps, the obtained chromium sesquioxide powder is uniform in particle size, the purity can reach 99.6%, and the purity requirement of pigment-grade chromium sesquioxide is met.