88 results about "Spinel group" patented technology

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention discloses a melt separation titanium slag modification treatment method and system. The method comprises the steps that in the direct reduction-melt separation process, melt separation titanium slag components are regulated and controlled to enable the melt separation titanium slag to contain 40 wt%-60 wt% of TiO2 and 1.1 wt%-9 wt% of C, deslagging is conducted, after heat preservation melting is conducted on the melt separation titanium slag at the temperature of 1550-1600 DEG C for 30-60 minutes, slow cooling is conducted to 1200 DEG C at the cooling rate of 5-10 DEG C / min, then rapid cooling is conducted to 900 DEG C at the cooling rate of 20 DEG C / min or above, finally natural cooling is conducted to the room temperature, and modified slag is obtained. According to the method, regulation and control of components of the melt-separated titanium slag are combined with heat preservation, slow cooling, quenching and natural cooling, anosovite is directionally induced to serve as a main phase of the titanium slag, micronized spinel and an amorphous glass phase, titanium resources are enriched in the anosovite phase, and the modified titanium slag high in grade and good in activity is obtained; and the problems of low additional value, small utilization scale, poor economic benefit and the like of molten titanium slag products are solved.

The invention relates to the technical field of adsorbent materials, and discloses a CoMn2O4 spinel adsorbent and a method for removing trivalent antimony in a water body by using the CoMn2O4 spinel adsorbent. The adsorbent is prepared by adopting a co-precipitation and low-temperature thermally induced crystallization synergetic green process: dissolving cobalt salt and manganese salt according to a stoichiometric ratio, dropwise adding a sodium hydroxide solution for co-precipitation, washing an obtained precursor, and drying at 80-120 DEG C under normal pressure for 12-48 hours to directly obtain the adsorbent. According to the method, the spinel material with low crystallinity, high specific surface area and rich surface hydroxyl is controllably synthesized by regulating and controlling the concentration of the precipitator and the drying condition, and the problems of active site loss and high energy consumption caused by traditional high-temperature calcination are avoided. When the composite material is used for treating wastewater containing trivalent antimony, antimony ions can be efficiently removed through the adsorption effect under the appropriate pH condition, excellent adsorption capacity is shown, the technology is simple, cost is low, safety is good, and an efficient and stable adsorption material and a feasible method are provided for water body antimony pollution treatment.

The present invention provides a sintered body having a high Curie point and exhibiting high magnetic permeability in a high frequency region. The sintered body comprises a spinel-type ferrite oxide having a main component of a metal element being Fe, Ni, Cu, and Zn, and further comprises Zr, Mn, Al, Co, and Cr, and when the molar fractions of Zn, Ni, Cu, Zr, Mn, Al, Co, and Cr, with Fe being 100 mol, are respectively set as a, b, c, d, e, f, g, and h, 100-a-b-c+2d+(1 / 2)e, a+b+c+d+e / 2, f, g, and h respectively satisfy the following formulas (1) to (5). 49.0 < 100-a-b-c+2d+(1 / 2)e < 50.0 (1) 50.2 < a+b+c+d+e / 2 < 52.7 (2) 0.0012 ≤ f ≤ 0.010 (3) 0.0005 ≤ g ≤ 0.0015 (4) 0.0005 ≤ h ≤ 0.004 (5).

The application discloses a kind of steel material for nuclear reactor and its preparation method and application.The steel material includes stainless steel matrix and the oxidation layer coated on the surface of the stainless steel matrix;The oxidation layer includes first oxidation layer and second oxidation layer;The first oxidation layer includes the mixed layer with spinel type crystal structure and corundum type crystal structure;The second oxidation layer includes corundum type crystal structure;The second oxidation layer is between the first oxidation layer and the stainless steel matrix.The steel material in the application is provided with oxidation layer on the stainless steel matrix, the oxidation layer contains spinel type crystal structure and corundum type crystal structure, the two kinds of crystal structure are uniform, continuous and dense, thereby blocking liquid lead bismuth from penetrating into crystal structure, so that the steel material has excellent lead bismuth corrosion resistance.In addition, the oxidation layer in the application has high bonding strength with the stainless steel matrix, and the bonding strength can reach more than 80MPa.

A high-power, high-temperature-stability M-type strontium ferrite belongs to the field of ferrite material preparation technology. The ferrite comprises a main formulation of SrCO3, La2O3, CaCO3, MnO, SnO2, Fe2O3, and Co2O3, and additives composed of CaCO3, SiO2, H3BO3, and La2O3. This invention introduces Sn-Mn ions for co-substitution, thereby constructing a Sn... 4+ -Mn 2+ The charge balance mechanism effectively suppressed the Fe ionization induced by the introduction of high-valence ions. 3+ To Fe 2+ Price change behavior, effective compensation after replacement due to the introduction of non-magnetic Sn 4+ This results in a loss of lattice magnetic moment. Simultaneously, through a stepped pre-sintering and sintering process, a CoFe2O4 hard magnetic spinel phase is induced to precipitate in the M-type strontium ferrite main phase. The negative coercivity temperature coefficient of the CoFe2O4 phase complements the inherent positive temperature coefficient of the matrix.

The application belongs to the technical field of refractory materials, and relates to a multi-metal composite magnesium-alumina spinel-containing refractory material and a preparation method thereof. The material of the magnesium-alumina spinel-containing refractory material is one of SiC-MgAl2O4, Al2O3-MgAl2O4 and MgO-MgAl2O4; the main body of components of the magnesium-alumina spinel-containing refractory material is granular SiC, Al2O3 and MgO as aggregate and a mixture of fine powder and micro powder composed of MgAl2O4 as matrix, and the components contain metal Al and Al-Mg alloy; the magnesium-alumina spinel-containing refractory material is prepared through hot air drying at 150-200 DEG C for 8-24 hours, and high-temperature sintering is not needed; the magnesium-alumina spinel-containing refractory material is a composite refractory material with alpha-SiC or corundum or periclase as main crystal phase and magnesium-alumina spinel as secondary crystal phase. The application realizes that the formed green body only needs to be treated at low temperature not higher than 200 DEG C, and can meet good mechanical properties, structural stability and corrosion resistance in a use temperature range of 25-1600 DEG C, and the built-in hot work thermal reserve can realize high mechanical strength and volume stability from normal temperature to the highest use environment through the waste heat in the oven heating process.

Materials include phase transition disordered rock salts having an ordered arrangement of partially disordered spinel cations to provide suitable constant current cycling behavior. The phase transition disordered rock salt has the chemical formula LixMnyTMzO2-uFu, where 0.9 < = x < = 1.3, 0 < = y < = 1, 0 < = z < = 0.5, and 0 < = u < = 0.5, and TM is Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, Sn, W, or a mixture thereof. Further, the phase transition disordered rock salt includes a first set of domains and a second set of domains interspersed between the first set of domains. The second set of domains is separated from the first set of domains by one or more anti-phase domain boundaries. Methods and systems are described in the present disclosure.

A method for producing a porous ceramic structure, comprising the following: a) Making kneaded clay by kneading a raw material; b) Obtaining a pressed body by shaping the kneaded clay and c) Firing of the pressed body, wherein the raw material contains the following: Cordierite; Cer and iron and / or manganese and / or cobalt, wherein the process c) forms a porous ceramic structure comprising a porous structural body formed essentially of cordierite, cerium-containing particles firmly attached to the structural body, and metal oxide particles each firmly attached to an inside of a pore in the structural body, wherein the metal oxide particles are particles of an oxide having a spinel structure containing iron and / or manganese and / or cobalt, The process c) includes the following: c1) Raising the temperature of the pressed body to a first temperature that is less than or equal to a liquid phase formation temperature; c2) Increasing the temperature of the pressed body from the first temperature to a second temperature that is higher than the liquid phase formation temperature and lower than a crystallization temperature of the metal oxide particles; c3) Increasing the temperature of the pressed body from the second temperature to a third temperature which is greater than the crystallization temperature and less than or equal to a maximum temperature; and c4) Maintaining the temperature of the press body at the maximum temperature for a specified period of time, and wherein a rate of temperature increase in process c2) in the range of 100 °C / h to 200 °C / h.

The invention discloses a lithium-rich manganese-based positive electrode material with an in-situ spinel phase and a preparation method of the lithium-rich manganese-based positive electrode material, and belongs to the technical field of synthesis of lithium-rich manganese-based materials, the material has a layered-spinel integrated structure generated in situ in a layered structure matrix, and the spinel phase is uniformly distributed in a layered lattice and forms a coherent interface with a layered phase; the molar ratio of Mn < 3 + > to Mn < 4 + > in the material is 0.05-0.20; the D50 particle size of the material is 2-10 [mu] m, and the particles are spherical or sphere-like. According to the method, the uniformly distributed spinel phase can be generated in situ in the layered matrix, and a coherent interface is formed, so that the dynamic performance and the rate capability are remarkably improved.

The present application provides a positive electrode active material, a preparation method therefor and the use thereof. The positive electrode active material may comprise a spinel lithium nickel manganese oxide material, wherein the spinel lithium nickel manganese oxide material has the following chemical formula: LiaNi0.5−xMn1.5−yMx+yO4, wherein M is selected from at least one of Mg, Zn, Ti, Zr, W, Nb, Al, B, P, Mo, V, or Cr, 0.9≤a≤1.1, −0.2≤x≤0.2, −0.02≤y≤0.3, and x+y≥0; the Mn3+ content in the spinel lithium nickel manganese oxide material may be less than or equal to 0.7 wt %.

This invention provides a spinel glass-ceramic and its preparation method. The glass-ceramic comprises crystal group 1 and crystal group 2, wherein crystal group 1 comprises crystals having the following structural formula: (Zn x Mg 1‑x‑ y Al 2‑2y (Al) 2y Mg y O4, wherein: 0≤x≤1; 0≤y≤1; and 0≤x+y≤1; the crystal group 2 includes zirconium oxide; the microcrystalline glass is transparent in the visible light range. The total crystallinity of the spinel microcrystalline glass of the present invention is at least 53wt%, and the elastic modulus is above 105GPa. The chemically strengthened microcrystalline glass obtained by chemical strengthening of the spinel microcrystalline glass of the present invention through ion exchange has excellent mechanical properties and impact resistance.

The application relates to the technical field of refractory materials, and particularly discloses a hercynite-mullite solid solution raw material and a preparation method thereof. The preparation method of the hercynite-mullite solid solution raw material comprises the following steps: after low-grade high-iron bauxite is crushed and homogenized, the low-grade high-iron bauxite is subjected to a flotation desilication treatment; the ore slurry after the flotation is subjected to a magnetic separation and iron removal treatment, so that the content of Fe2O3 in the ore slurry is controlled to be below 9 wt%; a carbon source is introduced into the ore slurry after the magnetic separation and iron removal, the ore slurry is uniformly mixed, and then the ore slurry is subjected to drying, shaping and sintering in a carbon-embedded atmosphere, and the hercynite-mullite solid solution raw material is obtained. The application realizes high-value and high-quality utilization of the low-grade high-iron bauxite. Through the flotation desilication and magnetic separation and iron removal processes, the contents of SiO2 and Fe2O3 in the raw material are effectively controlled, the low-grade ore which is originally difficult to be directly utilized is converted into qualified refractory material raw material, and the resource utilization efficiency and economic value are greatly improved.

The invention belongs to the technical field of metallurgy, and particularly relates to a chromium-containing steel slag harmless treatment method which comprises the steps that S1, chromium-containing steel slag is obtained; s2, heating the chromium-containing steel slag to obtain a first molten phase; s3, adjusting the alkalinity to crystallization alkalinity; s4, when the crystallization alkalinity is larger than or equal to the preset alkalinity, the first molten phase is cooled to the target temperature at the first cooling rate to obtain a second molten phase, and heat preservation is conducted on the second molten phase for the first time to obtain a third molten phase; when the crystallization alkalinity is smaller than the preset alkalinity, the first molten phase is cooled to the target temperature at the second cooling rate to obtain a second molten phase, and heat preservation is conducted on the second molten phase for the second time to obtain a third molten phase; the alkalinity of the slag is adjusted to the optimal alkalinity of the chromium-containing spinel crystal through component adjustment; aiming at alkalinity, a corresponding temperature control strategy is adopted for the chromium-containing steel slag to promote full crystallization of a spinel phase; and then, the harmless utilization of the chromium-containing steel slag can be realized by virtue of supergravity separation.

The invention discloses a rare earth doped perpendicular magnetic anisotropy oxide thin film and a preparation method thereof, and relates to the field of hard magnetic rare earth element doped oxide thin film materials, the rare earth doped perpendicular magnetic anisotropy oxide thin film has (001) plane crystal orientation and comprises a substrate and a thin film layer, the substrate is MgAl2O4 (001), and the thin film layer is LaxNi1-xCo2O4 (001). According to the rare earth doped perpendicular magnetic anisotropy oxide thin film and the preparation method thereof, lattice strain caused by mismatching of ion radius sizes can be overcome, lanthanum is doped into a crystal structure of spinel oxide NiCo2O4, a radio frequency magnetron sputtering preparation process is adopted, La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 target materials are adopted, and the rare earth doped perpendicular magnetic anisotropy oxide thin film is prepared. A series of La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 films with different thicknesses are prepared, the obtained films have stable vertical magnetic anisotropy, the Curie temperature is above room temperature, and the films have excellent conductivity and good performance.

The invention belongs to the technical field of refractory material preparation, and particularly relates to a high-density CMA refractory material and a preparation method thereof.The high-density CMA refractory material comprises the main components of Ca2Mg2Al28O46 and CaMg2Al16O27, the mass percent of the Ca2Mg2Al28O46 and the CaMg2Al16O27 is larger than or equal to 90%, the volume density of the CMA refractory material is 3.5-3.62 g / cm < 3 >, the water absorption rate is smaller than 1.2%, and the refractoriness under load is 1680-1700 DEG C. According to the preparation method, modified raw materials containing low-melting-point C12A7 and C3A phases and an active magnesium aluminate spinel phase are firstly prepared, the modified raw materials are melted in subsequent high-temperature reaction sintering, rearrangement of raw material particles and diffusion reaction among the raw materials are accelerated, the reaction sintering process of the CMA material and formation of equiaxial CMA crystal grains are promoted, and the preparation process of the CMA material is accelerated. The volume density and the refractoriness under load of the CMA refractory material are effectively improved.

The invention discloses a single-crystal lithium-rich manganese-based precursor based on in-situ surface engineering, a preparation method thereof and a positive electrode material. The preparation method comprises the following steps: firstly preparing a nickel-cobalt-manganese mixed salt solution I, a sodium metaaluminate / aluminum sulfate solution II, a precipitator containing sodium hydroxide / potassium hydroxide and an oxalic acid complexing agent; under the protection of nitrogen, the first solution, a precipitator and a complexing agent are introduced into the base solution to complete first-stage coprecipitation, the second solution is synchronously introduced for second-stage reaction after the first-stage coprecipitation reaches the standard, and a product is subjected to solid-liquid separation, washing and drying to obtain a precursor; the two-stage coprecipitation process is simple and controllable, the problem that aluminum doping is not uniform in a traditional solid phase method is solved, and the method is suitable for industrial production; surface layer in-situ aluminum doping and spinel phase construction improve the structural stability of the material, inhibit interface side reaction, and give consideration to both high capacity and long cycle performance; the problem of lattice mismatch of an ex-situ coating is avoided, the compatibility of an electrode and an electrolyte is enhanced, the energy density and the service life of a battery are improved, and commercial application of the material in the field of new energy automobiles is promoted.

This invention belongs to the field of refractory material preparation technology, specifically relating to a refractory brick and its preparation method. The refractory brick of this invention uses calcined bauxite and fused white corundum as the main raw materials, providing a high-strength refractory skeleton to ensure the basic compressive strength of the refractory brick. The addition of kyanite and andalusite, through a kyanite-andalusite composite, achieves gradient control of the expansion rate; kyanite rapidly responds to mid-temperature shrinkage, while andalusite sustains high-temperature expansion, synergistically achieving volume stability. Secondary alumina ash, hematite tailings, and serpentine tailings are also added to the raw materials to promote the formation of magnesium iron spinel and mullite phases; lanthanum oxide, yttrium aluminum garnet, titanium silicon carbide, and yttrium titanate are added to further improve the strength and crack resistance of the refractory brick; calcium hexaaluminate micron powder, p-Al2O3 micron powder, and deionized water are used as composite binders. Thus, the synergistic effect between the raw materials ensures that the prepared refractory brick has excellent strength and crack resistance.

The invention discloses ferromagnetic glass ceramic with a spinel crystal phase as well as a preparation method and application of the ferromagnetic glass ceramic, and belongs to the technical field of functional glass ceramic materials. A basic glass system of the glass comprises the following components in percentage by mass: 20-60% of SiO2; 10 to 40 percent of B2O3; 5 to 20 percent of Na2O; 0 to 15 percent of Al2O3; 0-25% of MO, wherein M is one or more of Co, Ni, Mn and Zn; fe < 2 > O < 3 >: 5-50%; and 0.2 to 2 percent of CeO2. Spherical spinel type ferrite crystals are separated out from the glass ceramic, and the glass ceramic has good magnetic performance and stability, is simple in preparation process, pollution-free and recyclable, and is suitable for the fields of microwave absorption, catalytic degradation of organic matters, nucleic acid extraction and the like.

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.

Provided are a ferrite particle, a carrier for electrophotographic developers, and the like, which have: a ferrite particle main body having a spinel crystal structure belonging to space group Fd-3m, the spinel component being represented by a specific formula (1); and a coating layer having a spinel crystal structure belonging to space group Fd-3m, covering the surface of the ferrite particle main body; the coating layer being a layer obtained by heat treating a ferrite represented by the specific formula (1), the content ratio of the coating layer in the ferrite particle being 5 mass% or more and 35 mass% or less, as determined by Rietveld analysis of a powder X-ray diffraction pattern, and satisfying a specific formula (2).

This invention provides a spinel lithium manganese oxide cathode material and its preparation method. The material comprises a spinel lithium manganese oxide core and a near-monocrystalline lithium manganese oxide coating layer covering the spinel lithium manganese oxide core. The general chemical formula of the spinel lithium manganese oxide core is Li. a Mn 2‑x M x O4, where M is a dopant element, 0.95≤a≤1.10, 0<x≤0.5, and the dopant element is selected from one or more of B, Mg, Al, Ti, Ga, Sr, Zr, Nb, Ba, La, Ce, and Ta. This material is prepared by co-precipitation to obtain a doped precursor, which is then mixed with a lithium source and sintered to form a core. The core is then mechanically mixed with manganese hydroxide, and finally mixed with a lithium source and sintered again to obtain the final product. Through the synergistic design of a "doped core + homologous electrochemically active coating layer," this material simultaneously achieves high-temperature cycling stability, high tap density, high tap density, and excellent rate performance.

The invention relates to a near-blackbody high-entropy inverse spinel oxide material, the general formula of the material is (A1xA2yA3zA4uA5v) 3O4, A1, A2, A3, A4 and A5 are any five elements of Fe, Ni, Co, Cr, Mn, Cu and Ti, x, y, z, u and v are equal or approximately equal, and x + y + z + u + v = 1; the structure of the material belongs to a cubic system and has an inverted spinel crystal structure, and the space group of the material is Fd-3m. Meanwhile, the invention also discloses a preparation method of the material. The method is simple to operate and short in production cycle, the obtained high-entropy inverse spinel oxide material has high solar absorptivity and infrared emissivity, the radiation curve of the high-entropy inverse spinel oxide material is close to an ideal black body radiation curve, and the high-entropy inverse spinel oxide material can be widely applied to the fields of radiation heating, human body heat management, aerospace heat dissipation, photovoltaic device cooling and the like.

The coated particle of the present invention has a core particle and a coating layer disposed on at least a part of the surface of the core particle. The core particle contains a spinel-type composite oxide containing a lithium element and a manganese element. The coating layer contains an oxide of a lanthanum element and a zirconium element. The content of the lanthanum element is preferably 0.01 mass% or more and 1.0 mass% or less when the coated particle is taken as 100 mass%. The content of the zirconium element is preferably 0.01 mass% or more and 1.0 mass% or less when the coated particle is taken as 100 mass%.

A spinel-type lithium-containing manganese composite oxide having a chemical composition of Li 1+x M y Mn 2‑y O 4‑k , -0.1≤x≤0.2, 0≤y≤0.3, 0≤k≤0.2, M comprises at least one of B, Na, Mg, Al, Si, P, K, Ti, V, Cr, Fe, Co, Ni, Cu, Zr, Mo, W and Te; the crystal grain of the spinel-type lithium-containing manganese composite oxide has a spherical-like morphology; the surface of a single crystal grain is connected by a continuous curved surface to a limited surface circumscribing the continuous curved surface, or is a continuous curved surface; the number of limited surfaces circumscribing the continuous curved surface of a single crystal grain observable in a SEM photograph is ≤5, and the ratio of the diameter dA of the limited surface circumscribing the continuous curved surface to the diameter dV of the crystal grain satisfies dA / dV≤0.5; optionally, dA / dV≤0.3.

The present application relates to the technical field of composite functional materials, in particular to a spinel-type composite photothermal super-hydrophobic coating, a preparation method thereof and application thereof in ice prevention and removal, wherein the preparation method of the spinel-type composite photothermal super-hydrophobic coating first prepares spinel-type CuFeMnO4 material with micro-nano structure through co-precipitation and high-temperature heat treatment of copper salt, iron salt and manganese salt, and then performs surface hydrophobic modification on the spinel-type CuFeMnO4 material by using palm wax. By combining the excellent photothermal conversion performance of the spinel-type CuFeMnO4 material with the low surface energy characteristics of palm wax, the synergistic effect of high-efficiency photothermal conversion and super-hydrophobic performance is realized, so that the coating layer formed by the prepared spinel-type composite photothermal super-hydrophobic coating has excellent super-hydrophobicity, durability and environmental adaptability and can achieve good ice prevention and removal effect. In addition, the preparation method has the advantages of simple process, low cost and environmental friendliness.

The invention belongs to the technical field of refractory materials, and relates to a whisker-toughened chromium-free refractory product with an antioxidant surface and a preparation method of the whisker-toughened chromium-free refractory product. The whisker toughened chromium-free refractory product with the anti-oxidation surface comprises a refractory matrix and a surface anti-oxidation layer, the refractory matrix is a silicon carbide-magnesium aluminate spinel or silicon carbide-calcium hexaluminate composite material, and Al / Si-N-O-C non-oxide whiskers are generated in the refractory matrix through an in-situ reaction to serve as a reinforcing phase; and the surface anti-oxidation layer covers at least one surface of the refractory matrix, is a compact glass glaze layer formed by melting at 700-1000 DEG C, and is used for preventing oxygen from invading the interior of the matrix. The refractory product provided by the invention can be completely chromate-free, and meanwhile, the high-temperature strength of the refractory product can be comparable with or even superior to that of a traditional high-chromium material by virtue of a completely preserved whisker enhancement effect, so that the refractory product is a next-generation furnace lining solution with environmental protection property and high performance; and a road is paved for reliable application of high-performance green refractory materials.

The application laser melting method for preparing thermosensitive bulk material belongs to the field of functional oxide ceramic material preparation, and the method first dissolves nickel oxide NiO and manganese dioxide MnO2 raw materials in oxalic acid solution, prepares NiMn2O4 thermosensitive powder material through drying, then anneals in an atmospheric environment to obtain a spinel structure thermosensitive powder material, and finally melts the thermosensitive powder material laid on the substrate into NiMn2O4 bulk material using a laser. By controlling parameters such as energy density of the melting laser, the performance of the prepared NiMn2O4 bulk material can be regulated. The thermosensitive bulk material prepared by the method has the advantages of simple preparation process, high density, good electrical performance and the like.

The invention relates to the technical field of refractory materials, in particular to a magnesium-chromium refractory material containing magnesia and chromite and a preparation method of the magnesium-chromium refractory material. The magnesium-chromium refractory material comprises chromite particles, magnesia fine powder, modified magnesium oxide, phenolic resin powder, sodium tripolyphosphate and magnesium stearate. Phosphate radical groups grafted on the surface of modified silicon dioxide adsorb and complex Cr < 3 + > / Al < 3 + > metal ions in advance and are gradually released along with the increase of the pH value of a system in the synchronous dropwise adding process of alkali liquor, so that the metal ions realize controlled and uniform coprecipitation on the surface of the modified LDH nanosheet, and a gradient spinel coating layer with uniform thickness and continuous crystal lattices is constructed on the surface of magnesia in situ. Cr < 3 + > / Al < 3 + > synergistic deposition is adopted, so that the thermal shock resistance is greatly improved. Silicate radicals in the modified LDH generate magnesium aluminum silicate in situ during high-temperature calcination, and interface chemical connection is achieved.

The invention discloses microcrystalline glass, a glass cover plate and a preparation method thereof, and the microcrystalline glass comprises the following components in percentage by mass: 45% < = SiO2 < = 58%, 25% < = Al2O3 < = 33%, 0% < = Li2O < = 4%, 2% < = MgO < = 6%, 0% < = B2O3 < = 2%, 4% < = Na2O < = 10%, 5% < = ZnO < = 12%, 0.05% < = Ag2O < = 0.3%, 0.01% < = CeO2 < = 0.05%, and 0.1% < = Sb2O3 < = 0.35%. A spinel crystal phase with the crystallinity larger than 32 wt% or a spodumene crystal phase with the crystallinity smaller than or equal to 0.5 wt% is achieved, the average transmittance is larger than or equal to 90.9%, the L value ranges from 96.34% to 96.91%, the a value ranges from-0.03% to 0.03%, the b value ranges from 0.17% to 0.70%, the haze is smaller than or equal to 0.12, and a sample has high transparency. Meanwhile, the Mohs hardness of the surface of the microcrystalline glass product exceeds 7.5, the microcrystalline glass product has excellent wear resistance and scratch resistance, Ag2O is adopted as a main nucleating agent, and meanwhile, the high-transmittance wear-resistant lithium-containing aluminosilicate glass ceramic composition possibly containing a small amount of spodumene crystal phase is realized.