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

The invention provides near-infrared adjustable double-perovskite type mechanoluminescence fluorescent powder as well as a preparation method and application of the near-infrared adjustable double-perovskite type mechanoluminescence fluorescent powder. The expression general formula of the double perovskite type mechanoluminescence fluorescent powder is Sr2M1-xSbO6: xCr < 3 + >, wherein M is Al, Ga, Sc, In or Y; x is equal to 1%-7%. The preparation process of the fluorescent powder comprises the following steps: a, weighing strontium carbonate, an oxide of M, antimony pentoxide and chromium sesquioxide according to the element proportion in the chemical general formula Sr2M1-xSbO6: xCr < 3 + >; b, mixing the weighed raw materials, and uniformly grinding to obtain a mixture; and c, carrying out high-temperature calcination on the obtained mixture to obtain the near-infrared adjustable double perovskite type mechanoluminescence fluorescent powder. By regulating and controlling the components of the substrate, the emission main peak can be adjusted from 780nm to 946nm. The fluorescent powder provided by the invention can show a self-recovery near-infrared stress luminescence characteristic without pre-irradiation under continuous stress stimulation, is simple to prepare and convenient for industrial batch production, and has a wide application prospect.

The invention relates to a method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale. According to the technical scheme, silicon in the vanadium shale alkaline leaching solution is removed through a sulfuric acid precipitation method, and a desilicication solution and a siliceous precursor I are obtained; washing the siliceous precursor I with sulfuric acid, washing with water and calcining to obtain white carbon black; carrying out vanadium-chromium co-extraction on the desilicication liquid by adopting an amine extraction agent to obtain a vanadium-chromium organic phase; carrying out vanadium-aluminum extraction separation on the washing liquid by adopting an amine extraction agent to obtain a vanadium-rich organic phase and an aluminum-containing raffinate; the vanadium-rich organic phase and the vanadium-chromium organic phase are mixed, vanadium-chromium separation is achieved through step-by-step reverse extraction, and vanadium-rich liquid and chromium-rich liquid are obtained; adjusting the pH value of the aluminum-containing raffinate to precipitate aluminum hydroxide, and calcining to obtain aluminum oxide; carrying out ammonium salt vanadium precipitation on the vanadium-rich liquid to obtain ammonium polyvanadate, and calcining to obtain vanadium pentoxide; and reducing the chromium-rich liquid, adjusting the pH value, precipitating chromium hydroxide, and calcining to obtain chromium sesquioxide. The method is high in leaching rate, small in slag amount, high in product purity and high in recovery rate.

The invention discloses a low-toxicity cuprous oxide semiconductor coating material and a preparation method thereof, and in the composition of raw materials for preparing the low-toxicity cuprous oxide semiconductor coating material, copper oxide powder CuO and copper powder Cu are used as main components; at least two metal oxides are used as additives and at least comprise Cr2O3 and Fe2O3; kaolin, feldspar powder and quartz sand are used as mineralizing agents, and deionized water is used as a solvent; the raw materials comprise the following components in percentage by mass: 35-45% of copper oxide powder CuO; 8 to 12 percent of copper powder Cu; 7 to 9 percent of ferric oxide (Fe2O3); 7 to 9 percent of chromium sesquioxide (Cr2O3); 5% to 8% of feldspar powder 3Al2O3. 2SiO2-Al2O3; 18 to 22 percent of quartz sand SiO2; 5 to 7 percent of kaolin; the sum of the mass proportions of the components is 100%. According to the technical scheme, the problem that the existing semiconductor coating material taking Cu2O as a main material does not have the capability of adopting spraying processing due to the fact that Cu2O has high toxicity is solved.

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 petuntse composition, ceramic and application, and relates to the technical field of ceramic. The ceramic disclosed by the invention is obtained by sequentially carrying out ageing treatment, sieving treatment, injection molding, airing, drying and sintering treatment on a petuntse composition. The petuntse composition comprises a ceramic waste material A, a ceramic waste material B and modified particles with gallium-coated cuprous oxide as a core and aluminum oxide as a shell in a specific proportion. And the components such as a high-entropy oxide solid solution generated by the reaction of hafnium oxide, tantalum pentoxide, niobium pentoxide, titanium dioxide, zirconium dioxide, chromium sesquioxide and carbon powder, and chromium heptacarbide are introduced, so that the ceramic prepared from the ceramic waste has excellent fracture toughness, bending strength, wear resistance, high temperature resistance and self-repairing ability. Therefore, the method has a wide application prospect.

The invention discloses a modified silicon carbide special ceramic material and a preparation method thereof, and belongs to the technical field of ceramic materials. The special ceramic material is prepared from the following raw materials in parts by weight: 80-100 parts of silicon carbide powder, 2-5 parts of chromic oxide, 5-10 parts of zirconium oxide, 3-8 parts of nickel oxide, 3-7 parts of boron nitride, 0.2-0.5 part of a binder and 1-4 parts of a lubricant. The special ceramic material prepared by the invention has relatively high hardness, excellent fracture toughness, extremely low density, wear resistance and extremely low thermal expansion coefficient, has a wide application prospect in practice, is simple in preparation method, and can be subjected to large-scale industrial production.

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.

The present application relates to a kind of gray glass composition and car window glass.The above-mentioned gray glass composition includes base component and coloring component, and the mass percentage of coloring component in gray glass composition is as follows: total iron Fe2O3 1.3%~2.5%, titanium dioxide TiO2 100ppm~800ppm, chromium trioxide Cr2O3 100ppm~500ppm, cobalt oxide CoO 100ppm~400ppm, selenium Se 10ppm~50ppm and tin oxide SnO2 10ppm~50ppm.The above-mentioned gray glass composition has the comprehensive performance of low visible light transmittance, low infrared transmittance, low ultraviolet transmittance, low solar direct transmittance, and also has the neutral gray tone that satisfies visual comfort, also has great economic advantage.

The application discloses a kind of microcrystalline glass and its preparation method, cover plate glass and electronic equipment, belong to new material field, the composition of this microcrystalline glass is: with 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%, Cr2O3, Fe2O3 Two are not simultaneously 0 and 1.9wt%≤Cr2O3+Fe2O3≤10wt%, it contains the crystal phase that produces gold star effect in its crystalline phase, produces gold star effect crystal phase is dichromium trioxide crystal, or iron oxide crystal, or chromite spinel, or dichromium trioxide crystal and chromite spinel.

The invention relates to the field of fused zirconia corundum bricks, and discloses a production method for regulating and controlling internal stress of fused zirconia corundum bricks, which comprises the following steps: preparing raw materials; melting in an electric furnace: putting the prepared raw materials into the electric furnace for melting; ventilating in stages in the melting process; preparing a mold for casting; after casting is completed, demolding and annealing are conducted; the raw materials comprise the following components in parts by weight: 50-65 parts of aluminum oxide; 25 to 35 parts of zirconium oxide; 8 to 12 parts of silicon dioxide; 0.5 to 2 parts of chromium sesquioxide; 0.5 to 1.5 parts of magnesium oxide; and 3-5 parts of scandium oxide. By adding scandium oxide and utilizing the characteristic that scandium oxide stabilizes a tetragonal phase, high-temperature phase change of zirconium oxide is effectively inhibited, and stress is reduced. Meanwhile, scandium oxide is used for refining grains, enhancing the grain boundary strength and reducing high-temperature stress concentration, so that the high-temperature stability of the fused zirconia corundum brick is improved, brittle fracture is avoided, and the thermal stability and durability are enhanced.

The present invention discloses a high-performance copper alloy for electronics and its preparation method, which relates to the technical field of electronic materials. In the present invention, copper alloy is modified by nano silver and nano tin. Under high-temperature conditions, the molten metals penetrate each other, fill the gaps between particles to make their connection tighter, thereby improving the electrical conductivity and mechanical properties of the matrix. Then, under the condition of high oxygen pressure, alloy powders mainly composed of aluminum, chromium, and tungsten carbide are melted and solidified through laser energy radiation to carry out metallurgical bonding with the matrix. First, a chromium trioxide oxide film is formed on the surface of the matrix, which reduces the oxygen activity at the oxide film interface, promotes the formation of a dense, complete and continuous aluminum oxide protective film by aluminum. Then, tungsten carbide therein forms a nucleation core, which refines the surrounding structure, improves the mechanical properties of the coating, and enhances the high-temperature oxidation resistance of the matrix.

The invention belongs to the technical field of solid waste recycling and wastewater treatment, and particularly relates to a method for treating chromium-containing wastewater by adopting organic amine flue gas desulfurization residues. According to the method, the organic amine flue gas desulfurization slag is adopted as a reducing agent, hexavalent chromium is reduced into trivalent chromium, the trivalent chromium is separated from water in a precipitate form, and the precipitate is roasted to obtain chromium sesquioxide powder with relatively high purity in supernate; hexavalent chromium and total chromium can reach the national standard. According to the method, the treatment cost of the hexavalent chromium wastewater and the flue gas desulfurization slag is remarkably reduced, and meanwhile, the resource utilization of the flue gas desulfurization waste in a waste-to-waste manner is also realized.

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 is applicable to the field of preparation of rare earth ceramic pigments, and provides a preparation method of a rare earth ceramic pigment for building wall surfaces, which comprises the following steps: S1, weighing industrial neodymium oxide and aluminum oxide in equal proportion, adding water, mixing and grinding to obtain slurry A; s2, weighing yttrium oxide and aluminum hydroxide in equal proportion, adding water and chromium sesquioxide, and mixing and grinding to obtain slurry B; s3, mixing the slurry A obtained in the step S1 and the slurry B obtained in the step S2 to obtain slurry C; and S4, the slurry C is poured into a drying cylinder to be dried, a stirring mechanism is arranged in the drying cylinder to stir and heat the slurry C, and a spiral conveying mechanism in the drying cylinder drives the slurry C to be vertically conveyed. The problems that in a traditional drying process, due to the fact that the conveying speed is not matched with the heating uniformity, the drying efficiency is low, and materials are heated unevenly are solved.

A welding flux for precipitation hardening (PH) stainless steel comprises 20-25 wt % of silicon dioxide (SiO2), 20-25 wt % of molybdenum trioxide (MoO3), 20-25 wt % of chromium (III) oxide (Cr2O3), 15-20 wt % of nickel (III) oxide (Ni2O3), 4-8 wt % of aluminum oxide (Al2O3), 4-8 wt % of aluminum nitride (AlN), 4-8 wt % of nickel (II) oxide (NiO) and 4-6 wt % of copper (II) oxide (CuO). By the use of the welding flux for PH stainless steel, together with the tungsten inert gas welding (TIG welding) procedure, a weld bead with a weld D / W ratio greater than or equal to 0.8 can be formed between the two PH stainless steel workpieces. Therefore, the welding flux for PH stainless steel is suitable for single-pass, full penetration welding of the PH stainless steel workpiece with a thickness greater than or equal to 3 mm.

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 discloses a preparation method of a double perovskite oxide Sr2CrReO6 with high purity. According to the method, strontium carbonate and rhenium heptoxide are taken as raw materials and are subjected to high-temperature reaction under the protection of argon to synthesize an intermediate product; then mixing with chromium sesquioxide and elemental chromium powder, and carrying out high-temperature reaction under a vacuum tube sealing condition to obtain a crude product; and finally, carrying out heat treatment for multiple times in an inert atmosphere, and removing an impurity phase to obtain high-purity Sr2CrReO6 powder. By optimizing the temperature and time of the high-temperature reaction and introducing the heat treatment step, the impurity content is remarkably reduced, and the product purity is improved. According to the compact ceramic prepared from the high-purity powder through a spark plasma sintering technology, the antisite defect is 13.5%, the Curie temperature reaches 610 K, and the saturation magnetization is 0.84 microB / f.u. The method is easy and convenient to operate, low in equipment requirement, high in safety and suitable for laboratory-scale high-quality material preparation.

The present application relates to the technical field of preparation of oxygen reference electrode materials, and in particular to a method for optimizing the preparation process of oxygen reference electrode materials. It includes: obtaining the mass m1 of polyvinyl alcohol to be added, the mass m2 of chromium trioxide, the mass m3 of ferric oxide, and the mass m4 of chromium powder; inputting m1 into a first preset model to obtain the stirring speed v1 and the stirring duration t1 of the mixed solution after the chelating dispersant is added; inputting m1, m2, and m3 into a second preset model to obtain the speed e1 of adding chromium trioxide and ferric oxide to the modified solution and the stirring speed v2 of the modified solution after adding chromium trioxide and ferric oxide; inputting m1, m2, m3, and m4 into a third preset model to obtain the speed of adding chromium powder to the dispersed solution and the stirring speed of the dispersed solution after adding chromium powder; preparing oxygen reference electrode materials according to the dispersed solution. The present invention can improve the performance of the prepared oxygen reference electrode material.

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.

The invention relates to the field of electronic materials, and particularly discloses a low-gradient zinc oxide varistor and a preparation method thereof. The invention relates to a low-gradient zinc oxide piezoresistor disc, which is prepared from the following raw materials in parts by weight: 88 to 96 parts of zinc oxide, 1.5 to 3 parts of antimony trioxide, 2 to 5 parts of bismuth trioxide, 0.2 to 1.8 parts of nickel oxide, 0.1 to 0.9 part of cobalt sesquioxide, 0.1 to 0.4 part of manganese oxide, 0.02 to 0.07 part of chromium sesquioxide, 0.15 to 0.18 part of lithium acetate, 1.2 to 1.8 parts of dispersing agents, 1.8 to 2.5 parts of binding agents, 0.12 to 0.15 part of aluminum nitrate and 0.001 to 0.003 part of silver nitrate. Under the synergistic effect of all the components, by adjusting the use ratio of all the components, the potential gradient of the resistor disc can be reduced, the large-current endurance capacity of the resistor disc is improved, and the change of electrical performance after impact is reduced.

The application relates to the technical field of acid etching agents, and discloses a hydrofluoric acid acid etching agent and a preparation method thereof, wherein the hydrofluoric acid acid etching agent comprises the following components in parts by weight: 70-75 parts of hydrofluoric acid, 40-45 parts of carrageenan, 25-30 parts of a humectant, 35-40 parts of chromium trioxide and 125-130 parts of water. Through the technical scheme, the problems of easy oxidation, complex raw materials, complicated preparation process and low stability of the acid etching agent in the prior art are solved.

The application provides a method for co-extracting vanadium and chromium from high-chromium vanadium slag and application thereof. The method comprises the following steps: roasting high-chromium vanadium slag and calcium salt to obtain roasted clinker, leaching the roasted clinker with a leaching agent to obtain a leaching solution, cooling the leaching solution to obtain sodium orthovanadate and a crystallization mother liquor; adding calcium oxide to the crystallization mother liquor to obtain a chromium-containing solution, performing first reduction on the chromium-containing solution to obtain chromium hydroxide, and performing first calcination on the chromium hydroxide to obtain chromium trioxide; mixing the sodium orthovanadate, water and carbon dioxide to obtain sodium metavanadate, sequentially performing transformation and second reduction on the sodium metavanadate, and performing second calcination to obtain a reduction clinker; mixing the reduction clinker, washing water and sodium bicarbonate mother liquor to obtain a sodium-containing solution and primary vanadium trioxide, and washing the primary vanadium trioxide to obtain vanadium trioxide. The application realizes high-value conversion of high-chromium vanadium slag, and simultaneously considers simplicity and economy, and no high ammonia nitrogen, high salt water and ammonia-containing waste gas are generated.

The utility model discloses an enhanced coated glass cover plate which comprises a glass body, a magnesium fluoride layer is arranged on the upper surface of the glass body, a chromium sesquioxide layer is arranged on the upper surface of the magnesium fluoride layer, a zirconium dioxide layer is arranged on the upper surface of the chromium sesquioxide layer, and a silicon dioxide layer is arranged on the upper surface of the zirconium dioxide layer. And the extension areas of the magnesium fluoride layer, the chromium sesquioxide layer and the zirconium dioxide layer are consistent with the glass body. The magnesium fluoride layer can be used as an anti-reflection layer, and reflection of light on the surface of the cover plate is reduced by adjusting the refractive index, so that the light transmittance is improved. The chromic oxide layer can be used as a functional layer to provide light absorption and thermal isolation performance. The zirconium dioxide layer is used as a protective layer and an enhancement layer, has high hardness, high wear resistance and good chemical stability, can protect the inner layer from being eroded by the external environment, and enhances the mechanical property of the whole coating layer.

The invention provides high-temperature reduction flame iron body porcelain and a preparation method thereof, and the iron body porcelain is prepared from the following chemical components in percentage by mass: 66.8 to 72.6 percent of silicon dioxide, 15.5 to 21.7 percent of aluminum oxide, 1.77 to 7.82 percent of total iron, 1.04 to 2.59 percent of magnesium oxide, 0.04 to 1.67 percent of calcium oxide, 0.06 to 0.1 percent of sodium oxide, 1.28 to 3.58 percent of potassium oxide, 0.1 to 0.85 percent of titanium dioxide, 0.02 to 0.03 percent of manganese oxide, 0.02 to 0.15 percent of scale pentoxide and barium oxide. 0.02% of chromium sesquioxide, and 1t of chromium sesquioxide; 0.006%, the content of nickel is 1t; the aluminum alloy comprises the following components in percentage by weight: 0.002% of aluminum, 0.002%-0.003% of copper, 0.006%-0.008% of strontium and 0.02% of zirconium, and the ignition loss is 4.05%-8.42%. According to the high-temperature reduction flame iron body porcelain and the preparation method thereof, the chemical composition is accurately controlled, so that the high-temperature reduction flame iron body porcelain has good physical and chemical properties, and meanwhile, a porcelain body is endowed with relatively high hardness and heat resistance; due to the proper iron content, the porcelain body has unique color and luster, the strength of the porcelain body is enhanced, and the problems of cracking, deformation and the like are effectively reduced.

The invention discloses a high-temperature-resistant resistor material and a preparation method thereof, and relates to the technical field of resistor materials. When the high-temperature-resistant resistance material is prepared, antimony trioxide and zinc oxide are mixed, ball-milled, dried and sintered at high temperature to prepare a zinc-antimony pre-synthesized phase; uniformly mixing zinc oxide, bismuth trioxide, cobaltosic oxide, the zinc-antimony pre-synthesized phase, manganese dioxide and chromic oxide, and performing ball milling, drying and sieving to obtain a refined mixture; mixing the refined mixture and paraffin, granulating, and pressing to obtain a green body; and carrying out glue removal, vacuum sintering and oxygen re-oxidation on the green body to prepare the high-temperature-resistant resistance material. The preparation method of the high-temperature-resistant resistor material provided by the invention not only can reduce the sintering temperature of the resistor, but also enables the prepared high-temperature-resistant resistor material to have excellent electrical properties.

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.

The invention discloses an Nb-Cr-Al ternary intermediate alloy and a preparation and application method thereof. The Nb-Cr-Al ternary intermediate alloy is prepared by taking aluminum as a reducing agent, niobium pentoxide and chromium sesquioxide as oxidants, calcium fluoride as a slag former and potassium chlorate as a heat generating agent through smelting by adopting a metallothermic reduction method; the Nb-Cr-Al ternary intermediate alloy is evenly mixed with sponge titanium, aluminum shots and Cr70Al alloy in proportion and pressed into an electrode block, then a plasma beam welding box is used for welding the electrode block, a primary electrode is manufactured, vacuum consumable electric arc melting is conducted through a vacuum consumable electric arc furnace, Ti-Al-Nb-Cr alloy is obtained, and the Ti-Al-Nb-Cr alloy is obtained. The high-melting-point Nb-Al intermetallic compound is effectively prevented from appearing in the cast ingot, the uniformity of chemical components of the cast ingot is guaranteed, the stability of the structure and performance of the alloy is guaranteed, and the metallurgical quality and the yield of the cast ingot are effectively improved.