1299 results about "Niobium" patented technology

The invention relates to the technical field of multi-source information analysis, in particular to a niobium-tantalum metal ore metallogenic evaluation system based on multi-source information analysis, which comprises a geologic structure association module, a mineral distribution interpretation module, a metallogenic environment adaptation module, a spatial feature analysis module and a potential region judgment module. According to the method, by introducing a multi-source data analysis and fusion method, the evaluation precision and comprehensive capability of resource exploration are effectively improved, analysis after information fusion is combined with relevance and spatial modes of different data types, it is ensured that mineralization potential evaluation is more accurate, the limitation of a single data source and manual analysis is overcome, and the method is suitable for popularization and application. According to the method, the identification precision and reliability of the mineralization law are improved, the potential area can be identified more accurately, resource potential analysis is optimized in combination with the adaptability of the mineralization environment, the efficiency and accuracy of determining the mineralization area are remarkably improved, the problems of information isolation and analysis deviation in a traditional method are avoided, and the scientificity and the practical application value of the exploration process are enhanced.

The invention belongs to the technical field of nickel-based alloy welding wires, and discloses a corrosion-resistant nickel-based alloy welding wire and a production process thereof, and the corrosion-resistant nickel-based alloy welding wire comprises the following components in percentage by mass: 50-65% of nickel, 16-24% of chromium, 8-10% of molybdenum, 3.5-5.5% of niobium and tantalum, 3-4.5% of copper, 3-4% of tungsten, 0.5-1.0% of tin, 0.1-0.3% of rare earth element, 0.1-0.5% of grain boundary optimizer, 2-5% of nano reinforced phase and the balance of Fe and other inevitable impurities. Through multi-element alloying design, nano reinforced phase compounding and gradient coating synergistic effect, comprehensive improvement of corrosion resistance, high-temperature mechanical property and welding manufacturability is achieved; a welding wire base body is based on nickel, a compact and self-repairing gradient oxidation film is formed by accurately regulating and controlling the atomic proportion of chromium, molybdenum and tungsten, and the chloride ion permeation resistance and the high-temperature oxidation resistance are remarkably improved; therefore, the welding wire has excellent corrosion resistance, high-temperature strength and welding adaptability.

The invention relates to the technical field of hafnium tetrachloride preparation, in particular to a process method for preparing low-niobium-content hafnium tetrachloride based on a hydrogen reduction method, which comprises the following steps: S1, raw material processing, S2, chlorination and impurity removal, S3, purification, S4, refining and S5, material receiving. According to the method, metal impurities in the hafnium-containing raw stone are removed step by step through the working procedures of raw material processing, chlorination and impurity removal, purification, refining and material receiving, high-purity hafnium tetrachloride with the low niobium content is obtained, in the refining working procedure, under the assistance of the supported catalyst, the metal niobium impurities are removed through a hydrogen reduction method, the removal rate is effectively increased, and the production cost is reduced. And moreover, the process flow is simplified, the energy consumption is reduced, and the method meets the environmental protection requirement.

The invention provides a surface-modified sulfide electrolyte and a preparation method thereof, and an all-solid-state battery, the surface-modified sulfide electrolyte comprises a sulfide electrolyte and a modification layer coated on the surface of the sulfide electrolyte, the chemical general formula of the modification layer is LiaMbNcXd, 0 < = a < = 3, 0 < = b < = 1, 0 < = c < = 1, 0 < = d < = 6, and 0 < = c < = 1. M is at least one element of magnesium, aluminum, calcium, iron, zirconium, niobium, tantalum, tungsten, gadolinium, yttrium, indium, hafnium, lanthanum and ytterbium, and X is at least one element of oxygen, sulfur, fluorine, chlorine, bromine and iodine. According to the surface-modified sulfide electrolyte, the modification layer with high ionic conductivity and high oxidation potential is coated outside the sulfide electrolyte, so that when the surface-modified sulfide electrolyte is applied to a positive electrode of an all-solid-state battery, the modification layer can improve the oxidation potential of the electrolyte on the premise of not reducing the ionic conductivity of the electrolyte; the effects of improving the interface stability between the positive electrode active material and the sulfide electrolyte and further improving the cycle performance of the battery are achieved.

The invention discloses a method for converting niobium minerals in niobium rough concentrate into pyrochlore. The method comprises the following steps: (1) mixing the niobium rough concentrate with a modifier, a fluorine-containing reagent, a reducing agent and a binder, and carrying out compression molding; and (2) roasting the mixed blank for a set time, preserving heat, and quenching to obtain pyrochlore type rough concentrate. The method comprises the following steps: (1) carrying out magnetic separation on pyrochlore type rough concentrate; (2) performing heating and acid leaching on the magnetic separation tailings; and (3) carrying out flotation to obtain niobium concentrate. According to the method, iron components in the rough concentrate are reduced into magnetic iron minerals, niobium minerals are converted into non-magnetic pyrochlore, follow-up niobium-iron separation is facilitated, and the grade of niobium in the niobium concentrate obtained through production can be effectively improved; and the method is high in adaptability to niobium rough concentrate, is also applicable to alkaline or acidic niobium rough concentrate, is relatively small in gangue mineral change and low in conversion reaction temperature, and has the advantages of energy conservation and emission reduction compared with other regulation and control processes.

The invention belongs to the field of nickel-based alloy materials, and discloses a precipitation hardening type nickel-based alloy welding wire and a preparation method thereof.The precipitation hardening type nickel-based alloy welding wire comprises, by mass, 50%-60% of nickel, 15%-20% of chromium, 15%-20% of iron, 2%-4% of molybdenum, 2%-5% of niobium, 0.01%-2% of tantalum, 0.2%-2% of aluminum, 0.5%-1.2% of titanium, 0.03%-0.08% of carbon, 0.1%-0.5% of manganese, 0.1%-0.5% of silicon, 0.01%-0.05% of magnesium, 0.01%-0.05% of yttrium, 0.5%-2% of tungsten, 0.1%-0.6% of cobalt, 0.001%-0.02% of boron and the balance impurities; according to the precipitation hardening type nickel-based alloy welding wire and the preparation method thereof, through component optimization and process innovation, the nickel-based alloy welding wire with high-temperature strength, excellent hot crack resistance and welding toughness is provided.

The invention relates to the technical field of flux-cored wires. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 4-6 parts of chromium carbide powder, 7-9 parts of molybdenum powder, 6-8 parts of nickel powder, 10-15 parts of niobium powder, 15-18 parts of tungsten carbide powder, 7-11 parts of a modified titanium carbide agent, 5-8 parts of a blending agent added based on boron and 2-4 parts of 30-mesh natural graphite; 1-2 parts of sodium fluosilicate; 1-2 parts of aluminum powder; and 70-75 parts of iron powder. The flux-cored wire can adapt to complex service environments of parts such as rollers and continuous casting crystallizers in the metallurgical industry, the service life of the parts subjected to surfacing repair is prolonged, the production efficiency of the parts subjected to surfacing repair is improved, the obtained flux-cored wire achieves balance of high-temperature performance, mechanical performance and low-temperature stability, and the comprehensive applicability of products is improved.

The invention relates to the technical field of high-hardness thick-specification high-wear-resistance steel plates, in particular to a high-hardness 30-80mm thick-specification flame-cutting-delayed-crack-free high-wear-resistance steel plate and a production method thereof. New flame cutting delayed crack preventing components and process design are adopted, the chemical components of the steel plate are mainly characterized by medium carbon, high silicon and niobium microalloying, and the wear-resistant steel plate with low impurity content, uniform and fine martensite and a certain amount of retained austenite structures is obtained after refining, continuous casting, controlled rolling and heat treatment. And formation and expansion of delayed cracks during flame cutting can be inhibited. And during flame cutting, thermal stress and structural stress formed in the cutting process of the thick steel plate are reduced through the cutting process of cutting with temperature and slow cooling with hot water after cutting, and the effect of no delayed crack after cutting is achieved. The surface hardness is larger than or equal to HB500, the tensile strength is larger than or equal to 1350 MPa, AKV at-40 DEG C is larger than or equal to 30 J, A is larger than or equal to 10%, retained austenite is 4%-6%, delayed cracks do not exist after flame cutting, and the flame cutting edge hardness is larger than or equal to HB460.

The present invention discloses a preparation method and application of a sulfide solid electrolyte material. The electrolyte has a Li6PS5Cl-type structure, and its chemical general formula is Li6Nb 1‑a P a S5X(0

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.15% ≤ Manganese ≤ 0.7% 3% ≤ Silicon ≤ 3.6% 0.7% ≤ Aluminum ≤ 1.3 % Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% with 3.85% ≤ Si+Al+Mn ≤ 5.5% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0% ≤ Nickel ≤ 1% 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, from 30 to 40% when calculated in accordance with Bertotti method.

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001 % ≤ Carbon ≤ 0.007 % 0.15% ≤ Manganese ≤ 0.2% 3% ≤ Silicon ≤ 3.6% 0.7% ≤ Aluminum ≤ 1.3 % Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% with 3.85% ≤ Si+AI+Mn ≤ 5.5% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1 % 0% ≤ Titanium ≤ 0.1 % 0% ≤ Vanadium ≤ 0.1 % 0% ≤ Chromium ≤ 1 % 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten ≤ 0.1 % 0% ≤ Cobalt ≤ 1 % 0% ≤ Arsenic ≤ 0.05% 0.001 % ≤ Calcium ≤ 0.01 % 0% ≤ Copper ≤ 1 % 0% ≤ Nickel ≤ 1 % 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 35 to 55% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.635T to 1.670T.

The present invention discloses a method for separating niobium from niobium-containing ore, wherein the niobium coarse concentrate is mixed with a sulfiding agent to obtain a mixture, and the mixture is subjected to reduction smelting to obtain a reduced ore, and a niobium-rich product is directly obtained from the reduced ore, or the niobium-rich product is obtained after post-processing the reduced ore. Compared with the traditional reduction smelting process, the method for separating niobium from niobium-containing ore of the present invention can achieve separation of niobium from slag while achieving separation of slag and iron, and enrich niobium to obtain a high-grade niobium-rich product, which can be purified through further metallurgical processes. The process method of the present invention has strong operability, simple process, low requirements on load-bearing smelting equipment, and is easy to promote and apply industrially.

The invention relates to a diffusion-resistant layer enhanced high-temperature oxidation-resistant composite ceramic coating for a niobium surface and a preparation process thereof. The coating system is composed of a diffusion layer, an anti-diffusion layer and a composite ceramic coating in sequence. In the preparation process, the Al2O3 diffusion-resistant layer is accurately constructed by adopting a slurry spin-coating method, and the method can realize accurate regulation and control of the thickness of the diffusion-resistant layer, so that uniform distribution of the Al2O3 layer is ensured. The introduction of the diffusion-resistant layer significantly improves the high-temperature stability and oxidation resistance of the coating, effectively delays the oxidation process of the material under an extreme high-temperature condition, and greatly prolongs the service life of the material.

The invention deals with a double cold rolled non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.2% ≤ Manganese ≤ 0.24% 3.1% ≤ Silicon ≤ 3.5% 0.8% ≤ Aluminum ≤ 1.1% Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0.001% ≤ Nickel ≤ 0.01 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less from 30% to 35% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.645T to 1.660T.

An embodiment of the present invention provides a steel material, for a pressure vessel, comprising, in weight %, 0.06-0.25% of carbon (C), 0.05-0.50% of silicon (Si), 1.0-2.0% of manganese (Mn), 0.005-0.40% of aluminum (Al), 0.010% or less of phosphorus (P), 0.0010% or less of sulfur (S), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.001-0.03% of titanium (Ti), 0.01-0.20% of chromium (Cr), 0.05-0.15% of molybdenum (Mo), 0.01-0.50% of copper (Cu), 0.05-0.50% of nickel (Ni), 0.0005-0.0050% of magnesium (Mg), 0.0005-0.0050% of calcium (Ca), 0.0020% or less of oxygen (O), and the remainder being Fe and other unavoidable impurities. A microstructure comprises in terms of area fraction 30% or less of pearlite and the remainder being ferrite. A non-metallic inclusion contains Mg—Al—Ca—O composite oxide.

The invention deals with a double cold rolled non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.1% ≤ Manganese ≤ 0.2% 3.1% ≤ Silicon ≤ 3.6% 0.8% ≤ Aluminum ≤ 1.1% Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0.001% ≤ Nickel ≤ 0.01 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, is from 35% to 45% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.64T to 1.66T.

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001 % ≤ Carbon ≤ 0.007 % 0.09% ≤ Manganese ≤ 0.15% 2.5% ≤ Silicon ≤ 3% 0.1 % ≤ Aluminum ≤ 0.5 % Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1 % 0% ≤ Titanium ≤ 0.1 % 0% ≤ Vanadium ≤ 0.1 % 0% ≤ Chromium ≤ 1 % 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1 % 0% ≤ Cobalt ≤ 1 % 0% ≤ Arsenic ≤ 0.05% 0.001 % ≤ Calcium ≤ 0.01 % 0% ≤ Copper ≤ 1 % 0% ≤ Nickel ≤ 1 % 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, from 35% to 45% when calculated in accordance of Bertotti method.

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.15% ≤ Manganese ≤ 0.25% 2.9% ≤ Silicon ≤ 3.4% 0.7% ≤ Aluminum ≤ 1.3 % 0.05% ≤ Nickel ≤ 1% Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% with 3.85% ≤ Si+Al+Mn ≤ 5.5% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 35% when calculated in accordance of Bertotti method.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention deals with a double cold rolled non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.1% ≤ Manganese ≤ 0.3% 3.1% ≤ Silicon ≤ 3.8% 0.6% ≤ Aluminum ≤ 0.8% Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0.001% ≤ Nickel ≤ 0.01 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 40 to 50% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.66T to 1.7T.

The invention provides an intermediate alloy for a high-temperature alloy and a preparation method of the intermediate alloy. The intermediate alloy for the high-temperature alloy comprises at least two of nickel, chromium and niobium as main elements, the content of N in gas impurity elements of the intermediate alloy for the high-temperature alloy is smaller than 0.01%, and the content of O in the gas impurity elements of the intermediate alloy for the high-temperature alloy is smaller than 0.1%. The intermediate alloy for the high-temperature alloy has the low melting point and the high purity, the components of the intermediate alloy are matched with mainstream high-temperature alloy components, the problem that in the adding process of niobium-containing raw materials and chromium-containing raw materials, the content of impurity elements is high is effectively solved, more excellent raw materials are provided for special metallurgy, and the production cost is reduced. And a wider window is provided for formulating a special metallurgy process.

The invention belongs to the technical field of ceramic materials, and relates to complex-phase high-entropy ceramic as well as a preparation method and application thereof. The technical problem that in the prior art, high-entropy ceramic cannot synchronously have high hardness and fracture toughness is solved. The invention provides a complex-phase high-entropy ceramic. The complex-phase high-entropy ceramic comprises a carbonitride phase and a single boride phase, the transition metal elements comprise titanium, zirconium, niobium, tantalum and hafnium; in the complex-phase high-entropy ceramic, calculated according to the volume content, 93Vol% is smaller than or equal to the carbonitride phase lt; 100 Vol%, 0 Vol% lt; and the single boride phase is less than or equal to 7Vol%. The complex-phase high-entropy ceramic has the advantages of uniform two-phase distribution, small grain size, high density, high hardness and high fracture toughness. The invention further provides a preparation method of the complex-phase high-entropy ceramic, a liquid-phase precursor method is combined with an in-situ hot pressing sintering method, the process is simple, and the production period is short. Meanwhile, the invention further provides application of the complex-phase high-entropy ceramic in material preparation in the fields of aerospace and mechanical engineering.

The invention belongs to the field of mineral treatment, and particularly relates to a method for selectively leaching niobium from niobium-titanium rare earth bulk concentrate, which comprises the following steps: leaching the niobium-titanium rare earth bulk concentrate by using a buffer solution dissolved with phosphoric acid-sodium phosphate as a leaching agent to obtain a niobium leaching solution and leaching residues enriched with titanium-rare earth; wherein the temperature in the leaching stage is 120-190 DEG C. According to the method, the buffer solution of phosphoric acid-sodium phosphate is innovatively adopted as the leaching agent, and combined control over the leaching temperature is further matched, so that the surface physicochemical characteristics of the niobium-titanium-rare earth bulk concentrate can be adapted, and selective leaching of niobium and separation of titanium-rare earth are achieved.

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.17% ≤ Manganese ≤ 0.4% 3% ≤ Silicon ≤ 3.6% 0.7% ≤ Aluminum ≤ 1.3 % Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% with 3.85% ≤ Si+Al+Mn ≤ 5.5% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0% ≤ Nickel ≤ 1% 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 25% when calculated in accordance of Bertotti method.

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 % 0.21% ≤ Manganese ≤ 0.7% 3% ≤ Silicon ≤ 3.6% 0.7% ≤ Aluminum ≤ 1.3 % Phosphorus ≤ 0.15 % Sulfur ≤ 0.006% Nitrogen ≤ 0.09% with 3.85% ≤ Si+Al+Mn ≤ 5.5% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1% 0% ≤ Titanium ≤ 0.1% 0% ≤ Vanadium ≤ 0.1% 0% ≤ Chromium ≤ 1% 0% ≤ Molybdenum ≤ 0.5% 0% ≤ Tungsten≤ 0.1% 0% ≤ Cobalt ≤ 1% 0% ≤ Arsenic ≤ 0.05% 0.001% ≤ Calcium ≤ 0.01% 0% ≤ Copper ≤ 1% 0% ≤ Nickel ≤ 1% 0 % ≤ Boron ≤ 0.05% 0 % ≤ Lead ≤ 0.2% 0% ≤ Tin≤ 0.2% 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, from 35% to 45% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.63T to 1.66T.

The invention relates to an alkaline miscellaneous rock type niobium ore prospecting method, which belongs to the technical field of geological prospecting, and comprises the following steps: systematically carding regional geological structure evolution and stratum lithology distribution, and mastering the distribution range, rock type and geological age of alkaline miscellaneous rocks; a gravimeter is adopted for measurement, and gravity abnormal data are obtained; the method comprises the following steps: collecting sediment samples in a water system in a target area, analyzing the content of niobium in the sediment, collecting surface and deep soil samples in a niobium element enrichment area, analyzing the content of the niobium element, collecting remote sensing image data in the target area, highlighting geological information related to alkaline miscellaneous rocks, and calculating the content of the niobium element in the target area. Comprehensively analyzing the remote sensing image, and delineating a possible mineralization alteration area; establishing a comprehensive database, and delineating a target region with the highest prospecting potential; sampling is conducted in the delineated target area, and the ore body position, scale and grade of the alkaline miscellaneous rock type niobium ore are determined. By comprehensively applying various technical means, the prospecting accuracy and efficiency are improved.

The invention discloses a preparation method of a steel pipe, which comprises the following steps: carrying out powdering treatment and surface modification on high-purity chromium powder, nickel powder, molybdenum powder, manganese powder, silicon powder, titanium powder, niobium powder, copper powder and iron powder according to a mass ratio, and uniformly mixing to obtain alloy powder; the alloy powder is subjected to compression molding and directional local strengthening, and a blank is obtained; carrying out sintering and multi-stage heat treatment on the green body to obtain a sinter; the sinter is subjected to multi-pass drawing and upsetting treatment, and a steel pipe is formed; straightening and rounding the steel pipe and polishing the inner and outer surfaces; the microstructure and performance of the alloy are optimized, defects and impurities in the alloy are reduced, and the uniformity and compactness of the alloy are improved, so that heat is transferred more effectively; stress concentration points and microdefects are reduced by changing the lattice structure and the chemical bond type in the alloy; compared with the prior art, excessive stress concentration of part of the prepared steel pipe is reduced, the uniformity of the alloy is improved, and the stress distribution of the steel pipe is more uniform.

The invention discloses a preparation method of niobium-tungsten alloy spherical powder and a 3D printing method of the niobium-tungsten alloy spherical powder, and belongs to the technical field of refractory metal material preparation.The preparation method comprises the steps that niobium, tungsten, molybdenum and zirconium refractory metal raw materials are smelted to obtain cast ingots with uniform components, and hydride powder is formed after hydrotreating and mechanical crushing; spherical powder is prepared by adopting a plasma spheroidizing technology, then dehydrogenation is performed for 1-3 hours at the temperature of 450-750 DEG C, magnesium powder is added, treatment is performed for 2-5 hours in an inert atmosphere at the temperature of 800-1100 DEG C, and finally the low-oxygen niobium-tungsten alloy spherical powder with the oxygen content lower than 120 ppm is obtained. Compared with a traditional process, the spheroidizing treatment is innovatively carried out before the dehydrogenation and oxygen reduction process, the deoxidation efficiency is improved through the relatively small specific surface area of spherical powder, and oxygen content control is achieved in combination with magnesium powder heat treatment. The problems of high oxygen content and low powder yield in a traditional process are solved, and material support is provided for high-performance niobium-tungsten alloy components in the fields of aerospace, nuclear power and the like.

The invention discloses high-strength high-temperature-resistant fireproof industrial glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The industrial glass is prepared from the following raw materials: silicon dioxide, boric oxide, aluminum oxide, sodium oxide, potassium oxide, niobium phosphate, a composite reinforcing component and a clarifying agent, the composite reinforcing component is prepared from hafnium oxide, gadolinium oxide and zinc oxide; the clarifying agent is obtained by mixing cerium dioxide and tin oxide. The preparation method of the industrial glass comprises the following steps: preparing functional components, melting glass, forming a glass substrate, and preparing the industrial glass. The prepared industrial glass is high in strength, good in high-temperature stability and excellent in fireproof performance.

The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% ≤ Carbon ≤ 0.007 %, 0.15% ≤ Manganese ≤ 0.25%, 3.2% ≤ Silicon ≤ 3.8%, 0.7% ≤ Aluminum ≤ 1.3 %, 0 % ≤ Phosphorus ≤ 0.15 %, 0 % ≤ Sulfur ≤ 0.006 %, 0 % ≤ Nitrogen ≤ 0.09% and can contain one or more of the following optional elements 0% ≤ Niobium ≤ 0.1%, 0% ≤ Titanium ≤ 0.1%, 0% ≤ Vanadium ≤ 0.1%, 0% ≤ Chromium ≤ 1%, 0% ≤ Molybdenum ≤ 0.5%, 0% ≤ Tungsten≤ 0.1%, 0% ≤ Cobalt ≤ 1%, 0% ≤ Arsenic ≤ 0.05%, 0.001% ≤ Calcium ≤ 0.01%, 0% ≤ Copper ≤ 1%,0.001% ≤ Nickel ≤ 0.01, 0 % ≤ Boron ≤ 0.05%, 0 % ≤ Lead ≤ 0.2%, 0% ≤ Tin≤ 0.2%, 0% ≤Antimony ≤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current loss in total iron loss less than 33 % when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.630T to 1.65T.