12 results about "Magnesium silicide" patented technology

The nano-silicate composite according to various embodiments may include nano-silicon oxide, nano-silicon, and magnesium silicide between ion-conductive forsterite (Mg2SiO4), enstatite (MgSiO3), and magnesium disodium silicate (Na2MgSiO4) particles. A manufacturing method for the nano-silicate composite according to various embodiments may include mixing a silicate precursor, a metal reductant, and additives; and performing a mechano-chemical reaction by mixing the silicate precursor, metal reductant, and additives with beads. An electrode composition according to various embodiments may include the nano-silicate composite of the present disclosure. An electrode according to various embodiments may include the nano-silicate composite of the present disclosure.

The present application relates to the technical field of silicon material preparation, and particularly relates to a method for preparing copper-doped porous silicon material from decomposed photovoltaic modules, which comprises the following steps: step 1: pyrolyzing decomposed photovoltaic modules to obtain battery pieces and copper cable products, crushing the battery pieces, and vacuum smelting the battery pieces with a certain proportion of copper cables to obtain copper-doped silicon ingots; step 2: reacting silicon copper composite powder obtained by crushing the silicon ingots with magnesium powder to synthesize magnesium silicide, and grinding the magnesium silicide sand to obtain sand-ground magnesium silicide powder; and step 3: performing dealloying reaction treatment on the sand-ground magnesium silicide powder. The present application uses battery pieces and copper cables in decomposed photovoltaic modules as raw materials, combines gas-phase dealloying, and uses acid pickling to prepare a porous structure silicon negative electrode material with excellent electrochemical performance. The present application does not involve a template, is simple and efficient to operate, has a short process cycle, uses inexpensive and widely-sourced raw materials, and is easy to mass-produce.

A method of making porous silicon includes providing magnesium silicide with silica nanoparticles and silica microparticles, or by providing magnesium with silica nanoparticles and silica microparticles. Any of the mixtures is then heated to a maximum of 500 DEG C.

The invention relates to the field of alkaline electrochemical generators, in particular to the field of accumulators. More specifically, the invention relates to a secondary electrochemical generator with a zinc electrode, characterized in that it comprises: a) an electrolyte, which is an aqueous alkaline solution with a molar concentration of 4 M to 15 M of hydroxide anions, and a concentration of soluble silicates, expressed as silicon dioxide (SiO2), of 0.15 to 80 g / l; b) a zinc electrode comprising a conductive ceramic, which at least partially comprises nitrides and / or hafnium carbides and / or carbides and / or magnesium silicides and / or carbides and / or niobium nitrides and / or carbides and / or carbides and / or titanium nitrides and / or vanadium nitrides and / or carbides and / or azides of any two metals selected from the group consisting of hafnium, magnesium, niobium, titanium and vanadium.

The application relates to a high-thermal-conductivity high-strength silicon nitride ceramic and a preparation method thereof. The preparation method of the high-thermal-conductivity high-strength silicon nitride ceramic comprises the following steps: (1) wetly mixing raw material powder composed of silicon nitride powder and sintering aids to obtain raw material mixed slurry; (2) sequentially performing forming, degassing, initial sintering and resintering on the raw material mixed slurry to obtain the high-thermal-conductivity high-strength silicon nitride ceramic; wherein the sintering aids comprise: first sintering aids composed of at least one of Sc2O3, Y2O3 and lanthanide oxides and second sintering aids composed of at least one of MgO, magnesium silicide and magnesium nitride; preferably, the molar ratio of the first sintering aids to the second sintering aids is 2-4:4-8.

The present application belongs to the technical field of new energy materials, and particularly relates to a porous silicon negative electrode material, a preparation method thereof and application thereof. The preparation method of the present application uses a molten salt method to prepare a porous silicon material in a high-temperature reaction kettle, reacts magnesium silicide with aluminum chloride in a high-temperature molten salt environment, removes magnesium salt by water washing and acid washing of the product, and obtains a pure porous silicon negative electrode material. This material can effectively alleviate the volume change of silicon during the charging and discharging cycle process, improve the cycle stability and the electrical conductivity of the material, and at the same time, the porous structure provides a large number of active sites for lithium ions, which helps to improve the electrochemical stability. The prepared porous silicon negative electrode material has a high specific surface area, can provide more active surface for the embedding and releasing of lithium ions, and thus realizes higher battery capacity and charging speed. The process is simple, environmentally friendly and low in cost.

The invention belongs to the field of preparation of biological nano materials, and discloses an oriented polylactic acid nanofiber membrane with piezoelectric property and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: S1, adding poly-L-lactic acid and polyethylene oxide into trifluoroethanol, stirring and dissolving, and adding magnesium silicide to obtain a spinning solution; and S2, carrying out electrostatic spinning on the spinning solution, collecting an oriented fiber membrane, and carrying out vacuum drying to obtain the oriented polylactic acid nanofiber membrane. The oriented polylactic acid nanofiber membrane prepared by the preparation method disclosed by the invention has excellent piezoelectric property and high orientation, can release hydrogen when encountering water, and can be applied to piezoelectric sensors and ischium application repair materials.

A novel metal matrix composite material and manufacturing process therefore, providing superior mechanical and thermal properties for aerospace, defense, payloads, missiles, marine structures, sports equipment, golf bat, armors and high-performance engineering applications. The composite has autonomous self-healing functionality enabled by in-situ formed magnesium silicide (Mg₂Si) intermetallic phases that remelt and seal microcracks upon localized heating above 400°C, rendering the composite particularly suitable for hypersonic vehicle thermal protection systems, satellite structural components subject to orbital thermal cycling, and warhead applications where structural integrity under extreme thermal-mechanical stress is critical. The technology is controlled by majority investor Divakar GV (51% stake), with investment opportunities available for subsequent funding rounds.

The invention belongs to the technical field of steelmaking auxiliary materials, and particularly relates to LF refining slag for nickel-based alloy and a preparation method of the LF refining slag. The preparation method of the LF refining slag for the nickel-based alloy comprises the following steps: (1) uniformly mixing 27-33% by weight of alkali powder, 26-32% by weight of acid powder, 6-10% by weight of sodium nitrate, 3-5% by weight of magnesium silicide powder, 1-3% by weight of silicon powder and 20-30% by weight of cryolite to obtain a mixed raw material; and (2) the mixed raw materials are pressed into balls, and the LF refining slag for the nickel-based alloy is obtained. According to the LF refining slag for the nickel-based alloy, the S removal effect is obvious, a high-alkalinity 2.8-3.5 environment is provided through matching of the acid powder and the alkali powder, and S removal is facilitated; s in the steel enters the slag, the magnesium silicide powder can effectively reduce the activity of S in the slag, and under the action of sodium nitrate, sulfide in the slag is effectively promoted to be converted into SO2 to escape.

This invention belongs to the technical field of solid waste treatment, and particularly relates to a method for treating solid waste from the preparation of silane products using the magnesium silicide method. The method includes: S1, crushing the waste residue, adding water and stirring to dissolve it, separating to obtain filtrate A and precipitate B; S2, adding hydrochloric acid aqueous solution to filtrate A to adjust its pH value to <7, concentrating and crystallizing, and then separating the solid and liquid to obtain ammonium chloride solid C and filtrate D1; S3: adding hydrochloric acid aqueous solution to precipitate B and stirring, then separating the solid and liquid to obtain magnesium ion-containing filtrate D2 and silicon-containing solid E; S4: mixing filtrate D1 and filtrate D2 to form solution D; S5: adding ammonia water to solution D to adjust the pH value to >8, then separating the solid and liquid to obtain magnesium-containing precipitate F and filtrate G. This invention can effectively recover ammonium salts and magnesium ion-containing precipitates contained in the waste residue, and does not introduce other components during the treatment, nor does it increase the cost of additional treatment equipment.

The invention discloses a method for preparing monosilane from a silicon-calcium compound, and belongs to the technical field of preparation of monosilane, the method comprises the following steps: grinding the silicon-calcium compound into powder, adding the powder into a reaction kettle, adding hydrochloric acid to carry out hydrolysis reaction, and introducing gas generated by the hydrolysis reaction into an adsorption purification device to carry out adsorption purification treatment, the treated mixed gas enters a rectifying tower to be subjected to rectification separation and purification, and a monosilane product is obtained through rectification and purification. The silico-calcium compound is used for preparing the silane gas, the problems that a magnesium silicide reduction method and a sodium aluminum hydride method are high in cost and low in purity are solved, meanwhile, the defects that an ordinary disproportionation method is long in process and high in energy consumption are overcome, and the silico-calcium compound is used for preparing the high-purity silane product.

This invention discloses a method for preparing unburned refractory bricks using manganese dioxide waste residue, belonging to the field of refractory brick technology. In this application, electrolytic manganese dioxide waste residue is pretreated to obtain electrolytic manganese dioxide waste residue powder. The electrolytic manganese dioxide waste residue powder is then ultrasonically reacted with magnesium silicide, expanded graphite, polyvinylpyrrolidone, and boron nitride, followed by heat treatment under a nitrogen atmosphere. The magnesium silicide is converted to graphene under nitrogen atmosphere. Expanded graphite is then exfoliated in situ to generate graphene, which provides a high-strength skeletal support. The in-situ generated graphene has an ultra-high specific surface area and excellent mechanical properties, and can fill the pores between the electrolytic manganese dioxide waste residue, effectively improving the density. The boron nitride, as a lubricating phase and auxiliary reinforcing phase, effectively improves the compressive strength and high-temperature flexural strength of the unburned refractory bricks under the synergistic effect of the manganese slag powder and graphene.