12 results about "CHROMIC 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.

Provided are a dielectric powder composition for multilayer ceramic capacitors. The dielectric powder composition includes 93 to 98.5 wt % of a main ingredient composed of dielectric base material powder, 1.0 to 5.0 wt % of a first sub-ingredient including glass powder coated on an outer periphery of the dielectric base material powder to form a core-shell structure, and 0.5 to 2.0 wt % of a second sub-ingredient made of a transition metal oxide mixed with the core-shell structure powder, wherein the main ingredient is non-stoichiometrically represented as [(BaxCaySr1-x-y)O]m[(TizZr1-z)O2](where x: 0.22 to 0.42, y: 0.10 to 0.35, z: 0.03 to 0.08, and m ranges from 0.85 to 1.05), the first sub-ingredient includes an alkaline earth metal compound including (Ba, Sr, Ca), SnO2, B2O3 and SiO2, and the second sub-ingredient includes at least two selected from the group consisting of manganese oxide (Mn3O4), tungsten oxide (WO3), and aluminum oxide (Al2O3).

The application provides a solid powder for treating formaldehyde-containing wastewater and a preparation method and application thereof. The method comprises the following steps: mixing hydrometallurgy device waste and water to obtain a mixture; and treating the mixture at high temperature under stirring to obtain a target solid powder; wherein the hydrometallurgy device waste comprises cobalt hydroxide, chromium hydroxide, polyaluminum chloride, polyacrylamide, activated carbon powder, phosphate ester kerosene and calcium hydroxide; the polyacrylamide is decomposed to generate ammonia gas under high-temperature alkaline conditions, which plays a role of hole expansion on the solid powder, and greatly improves the solid surface area of the powder. The solid powder has a good treatment effect on formaldehyde in acrylic acid device wastewater, and fully utilizes the peroxide-containing wastewater as an oxidizing agent to oxidize formaldehyde in the wastewater, so that the purpose of waste treatment by waste is achieved, and the biochemical property of the wastewater is improved.

The application provides a metallographic structure display method of a gold-based alloy, and the display method comprises the following steps: taking the gold-based alloy as an anode, electrolytic immersion etching the gold-based alloy in an electrolyte composed of hydrochloric acid, nitric acid and anhydrous ethanol, then cleaning the surface of the obtained gold-based alloy to obtain the gold-based alloy after electrolytic immersion etching; soaking the gold-based alloy after electrolytic immersion etching in ammonia water, then cleaning the surface of the obtained gold-based alloy, and obtaining the gold-based alloy after preliminary treatment after the surface is dried; immersing the gold-based alloy after preliminary treatment in a corrosion liquid composed of a saturated aqueous solution of chromium trioxide, hydrochloric acid and distilled water, then cleaning the surface of the obtained gold-based alloy, and completing the display of the metallographic structure of the gold-based alloy after the surface is dried, which greatly facilitates the observation of the metallographic structure of the gold-based alloy and is beneficial to obtaining the gold-based alloy product meeting the performance requirements.

The invention relates to the technical field of casting or heat treatment coatings, in particular to an anti-oxidation and anti-decarburization coating, a preparation method thereof and special steel. The coating is prepared from the following raw materials: high-temperature-resistant ceramic powder, sepiolite powder, mullite powder, aluminum oxide, chromic oxide, silicon carbide, a binder and water. The coating is rapid in film formation, smooth in surface after film formation and relatively good in leveling property; a layer of compact firm protective film capable of isolating a matrix from a heating atmosphere is formed on the metal surface during heating, so that the oxidation and decarbonization phenomena of the high-speed steel are quickly reduced, and permeation of other elements can be reduced; the influence on the physical and mechanical properties and chemical properties of the protected high-speed steel is small; after heating, cleaning is convenient, and automatic stripping is achieved; sagging does not occur at high temperature, and no toxic gas is generated; and after being coated, the coating has higher adhesive force, and after being heated, the coating also has better stripping property.

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 invention relates to the technical field of inorganic pigments, and discloses a high-temperature yellowish-brown inorganic pigment and a preparation method, system and application of the high-temperature yellowish-brown inorganic pigment. Iron minerals are enriched through 3.0 T high field intensity magnetic separation, and Fe2O3gt is obtained; 70% of purification powder; mixing the powder with zinc oxide and chromic oxide according to a specific ratio of 60: 25: 15, and calcining at a high temperature of 1180-1200 DEG C to promote generation of stable hue; and finally, carrying out air jet pulverization to obtain a superfine product. The red mud is successfully converted into the high-performance high-temperature yellow-brown inorganic pigment through a combined process of deep dealkalization, high-field-intensity magnetic separation, a specific formula and high-temperature synthesis, the product is pure in color development and excellent in high-temperature stability, and a new way is provided for high-value-added utilization of the red mud.

This disclosure proposes a hydrophobic / chromium-rich corrosion-resistant composite coating and a method for manufacturing and using the same, and belongs to the technical field of material surface coatings. The manufacturing method includes the steps of: preheating a workpiece; applying a coating slurry to the surface of the preheated workpiece, baking to cure, and sintering to obtain a chromium-rich corrosion-resistant coating on the surface of the workpiece, wherein the coating slurry comprises a solid phase component and a liquid phase component, the solid phase component comprising chromium powder, nickel powder, iron powder, and rare earth compounds, and the liquid phase component comprising Al(H2PO4)3, water glass, ammonium halide, polyvinyl alcohol, and Cr2O3; and spray-coating a superhydrophobic material in one layer onto the surface of the chromium-rich corrosion-resistant coating and curing to obtain a hydrophobic / chromium-rich corrosion-resistant composite coating. This disclosure describes how applying chromizing and superhydrophobic treatments to a workpiece imparts corrosion resistance, wear resistance, and hydrophobic properties to the workpiece, preventing water vapor inside the pipe from remaining on the inner wall of the pipe, thereby avoiding corrosion of the inner wall of the pipe, improving the overall properties of the pipe, and extending its service life.

The invention discloses a high-temperature protection technology, particularly provides a composite coating capable of improving the high-temperature sodium salt corrosion resistance of stainless steel and a preparation method of the composite coating, and belongs to the technical field of material surface treatment and modification. The composite coating comprises a metal oxide coating on the inner layer and an enamel coating and ceramic particles on the outer layer, the metal oxide coating can be a titanium dioxide coating, a chromic oxide coating and a nickel oxide coating, and the composite coating on the outer layer is composed of 68-88% of enamel glaze and 12-32% of aluminum oxide ceramic particles. Wherein the formula of the enamel glaze comprises 55-63% of silicon dioxide, 3-8% of aluminum oxide, 5-14% of zinc oxide, 2-6% of calcium oxide, 3-7% of zirconium dioxide, 1-5% of titanium dioxide, 2-8% of diboron trioxide, 1-6% of sodium oxide and 5-10% of potassium oxide. According to the invention, the high-temperature oxidation resistance and sodium salt corrosion resistance of the coating are improved by adjusting the formula of the enamel glaze, strengthening the ceramic particles and playing a role of a diffusion barrier of the metal oxide coating, so that the composite coating has the characteristics of simple process, low cost, excellent thermal corrosion resistance and the like.