124 results about "Spinel" patented technology

The present application relates to the technical field of glass-ceramics, in particular to a lithium-free transparent spinel glass-ceramics, a preparation method and application thereof. The lithium-free transparent spinel glass-ceramics is obtained by heat treatment of a base glass, and spinel crystal is the main crystal phase. The composition of the glass-ceramics contains the following oxides in mol%: SiO2 38.00-48.00%, Al2O3 25.50-30.00%, ZrO2 3.00-5.00%, MgO 5.00-8.00%, ZnO 8.00-14.00%, Na2O 7.20-14.00%, B2O3 3.00-8.00%, K2O 0-2.00%, and Y2O3 0-1.00%, and basically no Li2O. The glass-ceramics of the present application does not use high-cost lithium, and can obtain excellent surface and deep stress characteristics and excellent drop impact resistance through chemical strengthening.

The invention relates to high-strength and high-transparency nano glass ceramic and a preparation method and application thereof, and the high-strength and high-transparency nano glass ceramic is prepared from a synthetic aluminum-rich feldspar ceramic glass material, a beta-spodumene material, a cordierite material, a synthetic beta-dicalcium silicate material and a magnesium aluminate spinel material. According to the present invention, a stable-structure feldspar matrix glass is adopted as a main body precursor mineral material, zirconia micro-powder with a particle size of less than 10 nm is adopted as a nucleation agent and a micro-crack damping pinning agent, nanometer microcrystals with a particle size of less than 100 nm are controlled to be generated in a glass body formed after melting, and the nanometer microcrystals account for 50-95% by volume; the high-strength and high-transparency nanocrystalline glass with a uniform microstructure is formed and woven with matrix glass in a symbiotic manner. The prepared nano microcrystalline glass has the advantages of high hardness, high fracture toughness resistance and high light transmittance, and is suitable for manufacturing various optical glass.

Container whose inner wall surfaces are at least partially covered with a coating having the following crystallized phases, as a percentage based on the total mass of the crystallized phases: Spinel MgAl2O4: 10% to 60%, and Crystallized phases other than spinel MgAl2O4 and corundum: < 10% Corundum: complement to 100%.

The application discloses a preparation method of vanadium-doped and high-hydrated mangan-chromian spinel monocrystal under high temperature and high pressure. The cylindrical mangan-chromian spinel sample is prepared by taking solid rose triangular rhombic manganese carbonate crystal, solid chromium (III) acetate hydroxide crystalline powder, solid vanadium (IV) acetylacetonate oxide powder, solid oxalic acid powder, solid bixbyite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting raw materials; two pieces of water source sheets are made from the bixbyite powder and the chromium hydroxide powder with a weight ratio of 4:1; the two pieces of water source sheets are placed at two ends of the cylindrical mangan-chromian spinel sample and then are placed into a double-capsule structure experimental sample bin with an inner layer sleeve being a graphite tube and an outer layer sleeve being a gold-palladium alloy tube; the high temperature and high pressure reaction is carried out to obtain the mangan-chromian spinel monocrystal; and the preparation technology blank of the vanadium-doped and high-hydrated mangan-chromian spinel large-particle monocrystal under the current high temperature and high pressure conditions is solved.

This invention provides a composite magnesium-iron modified biochar and its method for purifying industrial wastewater, belonging to the technical field of functional materials for water treatment. The composite biochar of this invention uses porous biochar as a substrate, and through bimetallic impregnation, in-situ co-precipitation nucleation with pH control, and programmed temperature calcination, a composite crystalline phase of magnesium-iron layered bimetallic oxide and magnesium-iron spinel is anchored in-situ on its surface and internal pores. This material exhibits excellent magnetic field response characteristics and abundant bimetallic active sites. When added to composite wastewater, the bimetallic synergistic mechanism enables one-step simultaneous adsorption and degradation of COD, ammonia nitrogen, and total phosphorus; after the reaction, only an external magnetic field is needed to quickly achieve solid-liquid separation. This invention completely solves the problem of powder material recovery, and is resistant to desorption and regeneration, exhibiting excellent long-term recycling performance.

To provide a lithium secondary battery which has excellent charge-discharge cycle characteristics at high temperatures, while having low resistance and excellent output characteristics.SOLUTION: Provided are: spinel-type lithium manganese which contains phosphate and is represented by the chemical formula Li1+XMn2-X-YMYO4 (where 0.02≤X≤0.20, 0.05≤Y≤0.30, and M represents Al or Mg), in which the pore volume of pores having a pore diameter of 0.6 μm or less is from 0.003 cm3 / g to 0.2 cm3 / g inclusive and the relative standard deviation of the secondary particle diameters is from 25% to 45% inclusive; a method for producing the spinel-type lithium manganese; and a use of the spinel-type lithium manganese.SELECTED DRAWING: None

This invention discloses a cubic spinel-structured sulfide composite gas-sensitive material, a gas sensor, its preparation method, and its application, belonging to the field of gas sensor technology. The preparation method of this composite gas-sensitive material involves using FeCl2, CdCl2, and InCl3 as metal sources, and thiourea as a sulfur source, placing them together in a solvent of water, adding citric acid or sodium citrate as a dispersant, and obtaining a precursor material through a hydrothermal reaction. After calcination and annealing, a cubic spinel-structured FeIn2S4 / CdIn2S4 heterojunction material powder is obtained. The two gold electrodes and the ceramic tube of the gas sensor are coated with the cubic spinel-structured sulfide composite gas-sensitive material. The gas sensor based on this invention, made from a cubic spinel-structured sulfide composite gas-sensitive material, has a simple manufacturing process, low production cost, and is suitable for industrial mass production. It has broad application prospects in the field of acetone detection in trace hazardous situations.

The invention discloses a method for preparing compact fine-grain magnesium aluminate spinel ceramic by low-temperature sintering, which comprises the following steps: S1, mixing ethanolamine, magnesium acetate tetrahydrate and water according to a certain proportion to obtain a mixed solution A; s2, mixing citric acid, aluminum isopropoxide and water according to a certain proportion to obtain a mixed solution B; s3, slowly adding the mixed solution A into the solution B in the step S2 to form uniform colloid; s4, drying the colloidal solution to obtain a dried precursor; s5, performing low-temperature calcination on the precursor to obtain nano magnesium aluminate spinel powder; s6, carrying out ball milling and spray granulation to obtain spherical granulation powder with uniform particle size; s7, performing dry pressing molding and cold isostatic pressing molding to obtain a to-be-sintered ceramic biscuit; and S8, sintering in a muffle furnace to obtain the final magnesium aluminate spinel ceramic. The powder is subjected to ball milling, spray granulation, dry pressing forming and cold isostatic pressing forming, and then the compact fine-grain magnesium aluminate spinel ceramic is prepared through low-temperature sintering.

The invention relates to the technical field of ethylbenzene dehydrogenation, in particular to a preparation method and application of a spinel CoFe2O4 oxygen carrier, and the preparation method comprises the following steps: dissolving cobalt salt and iron salt in water according to a specific molar ratio, adding ethylene glycol, methanol and a polymethyl methacrylate template agent, uniformly mixing, drying, carrying out programmed temperature rise calcination in an oxygen-containing atmosphere, and calcining to obtain the spinel CoFe2O4 oxygen carrier. The CoFe2O4 oxygen carrier with a single spinel crystal structure is obtained. The oxygen carrier is used as a recyclable lattice oxygen source and can catalyze ethylbenzene oxidative dehydrogenation to generate styrene at the ultralow temperature of 200-400 DEG C, especially about 250 DEG C, both the ethylbenzene conversion rate and the styrene selectivity can reach 96% or above, and the performance degradation rate is smaller than 5% after at least 41 times of redox cycles. The process conditions are mild, the oxygen carrier structure is stable, the activity is high, and a new way is provided for energy-saving and low-carbon production of styrene.

The application discloses a preparation method of titanium-doped and high-hydrated magnesio-chromian spinel monocrystal under high temperature and high pressure, and the method comprises the following steps: preparing a cylindrical magnesio-chromian spinel sample by taking solid basic magnesium carbonate powder, solid basic chromium acetate crystal powder, liquid tetraisopropyl titanate, solid oxalic acid powder, solid brucite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting raw materials; preparing water source sheets by taking brucite powder and chromium hydroxide powder with a weight ratio of 4:1 as water sources; placing two water source sheets at two ends of the cylindrical magnesio-chromian spinel sample and putting them into a double-capsule structure sample bin together to carry out high temperature and high pressure reaction, so as to obtain titanium-doped and high-hydrated magnesio-chromian spinel monocrystal; and the method solves the blank of the preparation technology of the titanium-doped and high-hydrated magnesio-chromian spinel large-grain monocrystal under the current high temperature and high pressure conditions, and obtains experimental samples of the titanium-doped and high-hydrated magnesio-chromian spinel large-grain monocrystal.

A composite particle composed of spinel and disordered rock salt domains interspersed therein, made by removing lithium from a disordered rock salt to form a lithium deficient disordered rock salt and heating the lithium deficient disordered rock salt for a time and temperature to form the composite particle.

The invention belongs to the field of solid electric heating energy storage boilers, and provides a preparation method of a high-temperature-resistant, low-expansion, high-heat-storage and high-resistance heat storage material, the heat storage material is designed based on the microstructure of the material, magnesia particles with the particle size being larger than or equal to 1 mm are selected as aggregate, and organic matter coating is conducted on the magnesia particles through a coating technology; then mixing and twisting 30-50 parts of coated magnesia particles, 40-50 parts of high-alumina bauxite, 4-6 parts of binding clay, 2-3 parts of a binding agent and 3-6 parts of an aqueous solution, bundling the mixed and twisted materials, forming a green body by adopting a mechanical pressing process, and performing high-temperature heat treatment to obtain the heat storage material. The prepared heat storage material is of a magnesia particle-annular pore-spinel / cordierite reaction layer-mullite gradient structure, so that the cooperation of low thermal expansion coefficient, high heat storage capacity and high thermal resistance of the material is realized; the chemical composition of the prepared heat storage material is as follows: 10%-50% of MgO, 50%-80% of Al2O3, 10%-40% of SiO2 and a small amount of impurities.

The invention relates to a spinel-perovskite three-phase high-entropy ceramic powder material, the chemical formula of the three-phase high-entropy ceramic powder material is (A1xA2yA3zA4uA5v) Mn2O4, A1, A2, A3, A4 and A5 are four transition metal elements of Ca, Cu, Ni, Co, Zn and Mg and one rare earth element of La and Pr, the molar ratio of metal atoms is x: y: z: u: v: 2, and x + y + z + u + v = 1; the perovskite-spinel composite material has a spinel phase and a perovskite phase of two cubic structures. The high-entropy ceramic powder material has three phases coexisting, has excellent broadband emissivity and high-temperature thermal stability, and can be used as an infrared radiation material to be widely applied to high-temperature infrared radiation environments, such as the fields of aerospace thermal protection, industrial high-temperature kilns, power station boiler thermal management systems and the like.

A material includes a phase-transformed disordered rocksalt having partially disordered spinel cation ordering to provide suitable galvanostatic cycling behavior. The phase-transformed disordered rocksalt has a chemical formula of LixMnyTMzO2-uFu, where 0.9≤x≤1.3, 0≤y≤1, 0≤z≤0.5,and 0≤u≤0.5, and with TM being Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, Sn, W, or mixtures thereof. Additionally, the phase-transformed disordered rocksalt includes a first set of domains and a second set of domains interspersed with the first set of domains. The second set of domains is separated from the first set of domains by one or more antiphase boundaries. Methods and systems are described in this disclosure.

A method of preparing a calcined hydrogenolysis / hydrogenation catalyst includes mixing a copper-containing material, manganese-containing material, sodium aluminate, and water to obtain an aqueous slurry; contacting the aqueous slurry with a caustic material to form a precipitate in a caustic aqueous slurry; removing the precipitate from the caustic aqueous slurry; and removing residual water from the precipitate to form a dried precipitate; calcining the dried precipitate to form the calcined hydrogenolysis / hydrogenation catalyst exhibiting a Brunauer-Emmett-Teller (“BET”) surface area of about 5 m2 / g to about 75 m2 / g. The calcined hydrogenolysis / hydrogenation catalyst may include a spinel structure crystallite size of about 15 nm or less. The calcined hydrogenolysis / hydrogenation catalyst may include a tenorite crystallite size of about 20 nm to 30 nm.

The invention belongs to the technical field of refractory materials, and particularly relates to porous periclase-spinel ceramic prepared from waste magnesium-iron bricks and a preparation method thereof.The preparation method comprises the following steps that S1, the waste magnesium-iron bricks are crushed and screened, and granules are obtained; s2, the granules and water are mixed according to the proportion not lower than 1: 3, the mixture is filtered out after being soaked, the same amount of water is added again to be soaked, then the granules are moved into a constant-temperature and constant-humidity environment with the temperature not lower than 60 DEG C and the humidity not lower than 90% to be subjected to accelerated hydration, and the granules are taken out to obtain hydrated granules; s3, mixing and stirring the hydrated granules and light calcined magnesia powder, and uniformly mixing to obtain a mixture; and S4, extruding the mixture into spheres, controlling the density to be not less than 2.85 g / cm < 3 >, carrying out three-stage high-temperature sintering, and cooling to obtain the porous periclase-spinel ceramic.

This invention belongs to the field of enamel material preparation technology, specifically relating to a corrosion-resistant enamel material and its preparation method. The corrosion-resistant enamel material of this invention comprises a Q345R low-alloy steel substrate and an enamel coating; wherein the enamel coating consists of a base glaze layer and a top glaze layer. The base glaze layer is composed of glaze A, silica, and quartz powder; the top glaze layer is composed of glaze B, modified nano-sepiolite, and magnesium aluminum spinel micro powder. The corrosion-resistant enamel material of this invention uses a Q345R low-alloy steel substrate as the base material and a composite coating consisting of a base glaze and a top glaze as the enamel coating. The base glaze layer is tightly adhered to the surface of the Q345R low-alloy steel substrate, achieving a tight bond between the enamel coating and the substrate, and serving as an interlayer transition. The top glaze layer covers the base glaze layer and mainly serves a corrosion-resistant function. Through the synergistic function of the base glaze and the top glaze, corrosion protection of the substrate is achieved.

Provided are: a carbon dioxide reduction catalyst that can reduce carbon dioxide under mild conditions; a carbon dioxide reduction method using the carbon dioxide reduction catalyst; and a carbon dioxide reduction apparatus. The metal oxide according to the present invention has a spinel-type crystal structure comprising a metal element A, manganese and oxygen. The A comprises at least one metal element selected from the group consisting of nickel and copper, the (manganese) / (oxygen) molar compositional ratio is 1:1.8 to 1:2.2, and the (metal element A) / (manganese) molar compositional ratio is 1:1.7 to 1:2.3. The metal oxide is characterized in that the ratio of the intensity of a peak having a 2θ value of 16° to 20° (P18°) to the intensity of a peak having a 2θ value of 35° to 39° (P37°) in an X-ray diffraction pattern obtained by an X-ray diffraction measurement using Cu-Kα line, i.e., I18° / I37°, is 0.2 or more.

The invention discloses an acanthosphere-shaped multi-interface type metal oxide magnetic particle and a preparation method and application thereof.The magnetic particle comprises a core composed of magnetic nanoparticles and a shell layer composed of titanium oxide nanosheet spines arranged in a radial mode, and the magnetic particle has superparamagnetism, high specific surface area and rich active sites; and a large number of trap spaces matched with the exosome scale range, so that the method can be used for efficiently enriching and separating the exosome from the biological fluid. Meanwhile, the magnetic core has an out-phase junction composed of amorphous phase titanium oxide and anatase phase titanium oxide, a heterojunction interface composed of titanium oxide and the magnetic core and an ordered spine microstructure, the synergistic effect of the multi-interface effect and the point effect is fully exerted under laser irradiation, the excellent ultraviolet absorption capacity and electron-hole separation efficiency are shown, and the magnetic core has the good application prospect. The method is used for laser desorption ionization mass spectrometry, efficient in-situ pyrolysis of the exosome is achieved, desorption and ionization of metabolite in a lysis solution are promoted, and a high-resolution mass spectrum of the metabolite of the exosome is obtained.

The invention discloses a preparation method of a temperature-sensitive color-changing iron oxide-based material, and belongs to the technical field of iron oxide pigments. The preparation method comprises the following steps: mixing iron oxide powder and cobalt aluminate spinel powder, carrying out ball milling, and carrying out spray drying granulation on the mixed powder to obtain composite particles; adding the composite particles into a zirconium oxide solution for hydrothermal reaction, filtering and washing after the reaction is finished, and calcining at high temperature to obtain the temperature-sensitive color-changing iron oxide-based material. The ZrO2 buffer layer is introduced, the problem that an existing composite system is insufficient in cycling stability is effectively solved, after multiple times of temperature cycling, the color changing efficiency of the pigment can still be maintained at a high level, and the application reliability of a product needing a temperature-sensitive color changing function to be repeatedly used for a long time is ensured.

The application discloses a formaldehyde catalytic oxidation agent and a preparation method and application thereof, and aims at solving the technical problem of how to use copper manganese oxide with a spinel structure as an active component to efficiently and stably catalyze and oxidize formaldehyde at room temperature. The formaldehyde catalytic oxidation agent comprises the following components in percentage by mass: 70-94% of an activated carbon carrier with oxygen vacancy defects on the surface; 5-20% of an active component composed of copper manganese oxide with a spinel crystal phase structure; and 1-10% of an anti-poisoning auxiliary agent composed of an alkaline alkali metal salt; wherein, the active component and the anti-poisoning auxiliary agent are jointly loaded on the activated carbon carrier. The formaldehyde can be efficiently mineralized and decomposed at room temperature, and the service life is long.

The invention discloses a special chemical additive for LDS (laser direct structuring) with high light resistance and weather resistance and a preparation method of the special chemical additive, and belongs to the technical field of laser direct structuring materials. The additive is prepared from inorganic powder through surface pretreatment and composite ionomer coating, the inorganic powder is composed of copper-chromium oxide spinel and magnesium-aluminum-based hydrotalcite according to the mass ratio of (3-5): 1; the surface pretreatment agent is phytic acid; the composite ionomer coating layer comprises an ethylene-aluminum maleate ionomer and at least one auxiliary ionomer selected from a short-side-chain perfluorosulfonic acid ionomer and a zinc type vinyl acid ionomer. The preparation method comprises the steps of premixing, phytic acid surface treatment, composite ionomer coating, vacuum drying and the like. According to the invention, phytic acid treatment and composite ionomer synergistic coating are carried out, and nanosheets can be selectively introduced, so that the light resistance and weather resistance of the additive are remarkably improved, and the problem that the existing LDS material is easy to yellow and age is solved.

The invention belongs to the technical field of corrosion resistance and wear resistance of metal materials, and particularly relates to a method for improving corrosion resistance and wear resistance of a metal surface and application. The method comprises the following steps: preparing a catalytic oxidant, wherein the required materials comprise nano ferroferric oxide powder, inorganic materials such as copper, manganese and molybdenum, polyvinyl alcohol, cane sugar and the like in percentage by mass; and conditions are easy to realize, the cost is low, and the catalyst is environment-friendly and green. Synergistic permeation of nitrogen and oxygen elements is initiated and promoted through the prepared catalytic oxidizing agent, so that a composite permeation layer structure of an inner nitriding layer and an outer oxidation layer is formed on the metal surface, a spinel type ferroferric oxide oxidation film is compact and continuous, corrosive media such as chloride ions and water can be effectively blocked, and the corrosion resistance is remarkably improved. When the composite material is applied to the hydraulic piston rod, the corrosion resistance and the wear resistance of the piston rod are enhanced, so that the piston rod can better bear mechanical loads in a severe marine environment and is not easily eroded by seawater, and the corrosion resistance, the wear resistance and the like of the piston rod are improved.

A material includes a phase-transformed disordered rocksalt having partially disordered spinel cation ordering to provide suitable galvanostatic cycling behavior. The phase-transformed disordered rocksalt has a chemical formula of LixMnyTMzO2-uFu, where 0.9≤x≤1.3, 0≤y≤1, 0≤z≤0.5,and 0≤u≤0.5, and with TM being Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, Sn, W, or mixtures thereof. Additionally, the phase-transformed disordered rocksalt includes a first set of domains and a second set of domains interspersed with the first set of domains. The second set of domains is separated from the first set of domains by one or more antiphase boundaries. Methods and systems are described in this disclosure.

The invention discloses a multi-stage synergistic self-repairing type composite enhanced converter slag-stopping sliding plate brick and a preparation method thereof. The material is composed of zirconium system / corundum / spinel multi-scale aggregate, a boron system self-repairing reinforcement phase containing ZrB2, B4C and Al3BC3, a metal Si / Al in-situ hard phase generating agent and functional powder, and is prepared by adopting a normal-pressure sectional drying and high-temperature sintering process. In the service process, cracks are blocked through ZrO2 / B2O3 glass phases, the oxidation resistance, the wear resistance and the thermal shock resistance are improved through Al18B4O33 whisker bridging and SiC / Al4C3 and other in-situ hard phases, the service life of the sliding plate is remarkably prolonged (larger than or equal to 20 heat times), meanwhile, the low-heat-conductivity and low-energy-consumption processes are achieved, and the sliding plate is suitable for the fields of converter slag control and other high-temperature fire-resistant components.

Provided is a secondary battery in which charge / discharge characteristics can be improved. The secondary battery comprises: a positive electrode that includes positive electrode active material particles; a negative electrode; and an electrolyte that contains an aqueous solvent. The positive electrode active material particles include a lithium manganese composite oxide having a spinel crystal structure. The pH of the electrolyte is smaller than 9. The ratio I2 / I1 of the maximum value I1 of scattered light intensity in the range of 600 cm-1 to 700 cm-1 and the maximum value I2 of scattered light intensity in the range of 950 cm-1 to 1000 cm-1 as measured by Raman spectroscopy using excitation light of 532 nm on the surface of the positive electrode active material particles is 0.2 to 2, inclusive. The molar ratio of phosphorus to manganese as measured by X-ray photoelectron spectroscopy on the surface of the positive electrode active material particles is 0.2 to 5, inclusive.

The invention relates to a magnesium hydroxide composite flame retardant and a preparation method and application thereof, and belongs to the technical field of flame retardant materials.Porous graphite phase carbon nitride powder is prepared through secondary calcination, FeNi2S4 is generated on the surface of the powder in situ to form heterojunctions, then nano magnesium hydroxide is loaded, silicon dioxide is coated, the flame retardant efficiency and the smoke suppression effect are remarkably improved, and the flame retardant efficiency and the smoke suppression effect are improved; ammonia gas and carbon dioxide gas released during synergistic calcination of melamine and ammonium bicarbonate form porous channels in graphite phase carbon nitride powder, sufficient anchoring sites are provided for FeNi2S4 and magnesium hydroxide, transition metal sites of iron ions and nickel ions can catalyze a base material to form carbon in a trans-spinel structure of FeNi2S4, and the transition metal sites of the iron ions and the nickel ions can catalyze the base material to form carbon in the trans-spinel structure of FeNi2S4. Graphite-phase carbon nitride promotes graphitization of a carbon layer, the carbon yield is increased through synergism of graphite-phase carbon nitride and graphite-phase carbon nitride, release of combustible gas is effectively blocked, magnesium hydroxide is uniformly loaded in a nano-particle form, and crystal water is released through high-temperature decomposition to absorb latent heat.

The invention discloses high-strength impact-resistant tempered glass and a preparation method thereof, and belongs to the technical field of inorganic non-metallic materials. A rare earth doped Al2O3-ZrO2 nano-composite precipitated phase is uniformly dispersed and distributed in a tempered glass matrix, and the rare earth doped Al2O3-ZrO2 nano-composite precipitated phase is composed of Y3 + or Ce4 + stabilized tetragonal phase ZrO2 and spinel type Al2ZrO5; the glass has a gradient stress structure, and comprises an upper surface compressive stress layer, a lower surface compressive stress layer and a subsurface toughness buffer area positioned below the upper surface compressive stress layer and the lower surface compressive stress layer, and the buffer area is in a micro-tensile stress state and contains the nano-composite precipitated phase. Through the collaborative design of rare earth doped nano phase change toughening and asymmetric gradient stress, the mechanical property of hard surface and tough interior is achieved, the impact resistance height is high, the fracture toughness is large, the structural integrity is still kept after multi-point impact, and the composite material is particularly suitable for high-safety-requirement scenes such as building curtain walls, explosion-proof windows and new energy automobile skyscreens.

The application discloses a method for synthesizing spinel nanomaterials based on subcritical technology, and the specific preparation method is as follows: precursor solution and additives are put into a high-pressure reaction kettle for mixing, then the characteristics of high diffusion coefficient, high reaction rate and low surface tension of subcritical water are utilized, a heating device (160-180 DEG C) and different reaction atmospheres (oxygen, helium or nitrogen) are used to promote the uniform mixing and high-efficiency reaction between reactants, and the reaction is kept for 30-180 min, so that the crystal nucleates rapidly and forms nanoparticles. Compared with traditional synthesis methods of spinel nanomaterials, the method has good safety, stability and controllability, and is a subcritical technology method for synthesizing spinel nanomaterials with wide prospect.

The application relates to a microcrystalline glass and a preparation method, glass product and application thereof, which comprises 35wt%-55wt% of SiO2, 20wt%-30wt% of Al2O3, 0wt%-6wt% of MgO, 0wt%-10wt% of ZnO, 0.5wt%-3wt% of B2O3, 0wt%-3wt% of P2O5, 0wt%-3wt% of Li2O, 0wt%-6wt% of Na2O, 0wt%-6wt% of TiO2 and 0wt%-6wt% of ZrO2 according to mass percentage; the microcrystalline glass comprises spinel crystal phase, zirconia crystal phase and spodumene crystal phase, the total crystallinity is 25%-45%, and the average grain size of the crystal phase is 10nm-50nm. The microcrystalline glass has good optical and mechanical properties, low raw material cost and can be prepared through a simple process.