70 results about "Composite crystal" patented technology

The invention discloses an application of a molybdenum disulfide-based piezoelectric catalytic material in a seawater uranium extraction material, and relates to the technical field of seawater uranium extraction, thiourea and sodium molybdate are used as precursors, and a MoS2 nanoflower with a specific 1T / 2H composite crystal structure is constructed through a hydrothermal synthesis technology. The method is placed in a uranyl nitrate solution, ultrasonic treatment is combined, efficient extraction of uranium can be achieved, and the method has potential application to extraction of uranium from seawater. The method is simple in process and environment-friendly, almost does not generate harmful waste in the synthesis process, does not need complex operation, and has good amplification preparation potential.

The invention relates to the technical field of concrete crack repairing, and particularly discloses a quick-hardening concrete crack repairing agent and a preparation method thereof. The invention relates to a quick-hardening concrete crack repairing agent, which is prepared from the following raw materials: 45 to 55 parts of sulphoaluminate cement; 10 to 15 parts of silica fume; 12 to 18 parts of metakaolin; 5-8 parts of a bimetallic composite seed crystal; 10 to 15 parts of double-layer shell nano anhydrite; 2-4 parts of magnesium oxide; 0.5 to 1 part of polypropylene fiber; 0.5 to 0.8 part of a water reducing agent; 15 to 20 parts of water; the bimetallic composite seed crystal is a zirconium and strontium element co-doped composite crystal nucleus; the double-shell nano anhydrite is composed of an inner core nano anhydrite, a middle aluminum sulfate early strength phase and an outer mesoporous SiO2 shell. The quick-hardening concrete crack repairing agent has the advantages of being short in setting time, high in early strength and excellent in interface bonding performance.

The invention discloses a preparation method of in-situ solidified soil of modified semi-hydrated phosphogypsum. The preparation method comprises the following steps: mixing pretreated phosphogypsum with a composite crystal modifier, homogenizing and retting, and calcining to obtain the modified semi-hydrated phosphogypsum; wherein the mass ratio of the alpha-type semi-hydrated phosphogypsum to the beta-type semi-hydrated phosphogypsum is controlled to be 1: (0.5-2) in the calcining process; and (2) mixing the modified semi-hydrated ardealite with a composite curing agent, uniformly mixing the obtained mixture with the pretreated in-situ soil, adding water to obtain a soil body, and performing layered compaction and maintenance on the soil body to obtain the in-situ solidified soil of the modified semi-hydrated ardealite. According to the method provided by the invention, the pretreatment process of the phosphogypsum is optimized, and the synergistic effect of the composite crystal modifier and the composite curing agent is combined, so that the soil can be quickly cured, and the cured soil is excellent in mechanical property and high in CO2 storage efficiency and heavy metal adsorption rate.

The invention discloses high-titanium blast furnace slag glass ceramics and a preparation method thereof. The method comprises the following steps: jointly melting high-titanium blast furnace slag in a high-temperature molten state and auxiliary raw materials; the high-titanium blast furnace slag glass ceramic is prepared from the following raw materials in percentage by mass: 60.0-90.0% of high-titanium blast furnace slag and 10.0-40.0% of additional raw materials, since the high-titanium blast furnace slag is rich in TiO2, the components of the high-titanium blast furnace slag can be adjusted by adding the additional raw materials to form a CaO-MgO-Al2O3-SiO2 system, and the additional ZrO2 is used as a nucleating agent and forms a composite nucleating agent together with TiO2 in the slag, so that the high-titanium blast furnace slag glass ceramic is prepared. The material is promoted to spontaneously separate out microcrystalline glass taking pyroxene as a main crystal phase in the heat treatment process; a rolling method with a heat recovery function is adopted in the forming process, waste heat of molten slag can be fully utilized, heat energy is provided for crystallization and nucleation of the microcrystalline glass, and the prepared microcrystalline glass has the advantages of being good in chemical stability, high in mechanical property, high in abrasion resistance and the like and is widely applied to the fields of buildings, home furnishing, electronics, chemical engineering, automobiles and the like.

The invention belongs to the technical field of electrochemical energy storage materials, and discloses a high-capacity sodium ion battery positive electrode material based on a P2-O3 composite phase and a preparation method and application thereof. The chemical general formula of the positive electrode material is Na [mu] Li [v] Mg [gamma] Ni [x] Mn [z] TMyO2, wherein [mu] is greater than or equal to 0.75 and less than or equal to 0.85, [v] is greater than or equal to 0.05 and less than or equal to 0.15, [gamma] is greater than or equal to 0.01 and less than or equal to 0.10, x is greater than or equal to 0.20 and less than or equal to 0.30, z is greater than or equal to 0.55 and less than or equal to 0.70, y is greater than or equal to 0.005 and less than or equal to 0.05, and [v] + [gamma] + x + z + y And TM is a combination of at least two elements selected from 3d, 4d and 5d transition metal elements and / or lanthanide series metal elements. The material has a composite crystal structure in which a P2 phase and an O3 phase coexist. The high-capacity sodium-ion battery positive electrode material based on the P2-O3 composite phase has relatively high specific capacity and good cycling stability, and can be used for a sodium-ion battery.

The invention belongs to the technical field of fiber plasterboards, and discloses a light high-strength fiber plasterboard based on alpha-semi-hydrated gypsum and a preparation method of the light high-strength fiber plasterboard. The raw materials comprise alpha-semi-hydrated gypsum, a thixotropic agent, a light filler, polypropylene fibers, glass fibers, a titanate coupling agent and water. The main raw material alpha-semi-hydrated gypsum is prepared from phosphogypsum as a raw material through the composite crystal modifier under the normal pressure condition, the crystal is in a hexagonal short column shape, the crystal face is complete, the length-diameter ratio is about 1, the mechanical property is excellent, and the prepared gypsum board is high in compressive strength and breaking strength. In addition, the coupling agent is used for modifying the composite fiber, so that the hydrophobic property of the gypsum board is improved, meanwhile, the compatibility of the fiber and the alpha-semi-hydrated gypsum is also improved, and the mechanical property of the gypsum board is further improved.

The invention discloses a cobalt-free lithium-rich ultrahigh-nickel positive electrode material with a composite crystal domain structure and a preparation method, and belongs to the field of lithium battery positive electrode materials. The positive electrode material with the composite crystal domain structure is composed of LiNiaMbMn (1-a-b) O2 with an R-3m space group and Li2MnO3 with a C2 / m space group, the Li2MnO3 crystal domain can effectively inhibit the aggravation of the lithium-nickel mixing degree of the cobalt-free ultrahigh nickel positive electrode material caused by cobalt removal, and the conversion of the positive electrode material structure from a layered phase to a disordered rock salt phase is slowed down; meanwhile, the Li2MnO3 crystal domain with a stable structure inhibits severe unit cell volume change caused by phase structure transformation in the electrochemical cycle process of the cobalt-free ultra-high nickel positive electrode material, stress and strain accumulation is reduced, microcracks in the material are further effectively inhibited, and the cycle stability and thermal stability of the cobalt-free ultra-high nickel positive electrode material are improved.

The application discloses a solid waste-based green nano composite crystal seed early strength agent and a preparation method thereof, and relates to a green and environment-friendly crystal seed early strength agent.The solid waste-based green nano composite crystal seed early strength agent comprises the following raw materials in parts by weight: 200-300 parts of deionized water, 100-150 parts of a dispersing agent, 200-300 parts of a Ca(NO3)2 solution, 100-200 parts of a Na2CO3 solution, 50-100 parts of steel slag powder and 50-140 parts of waste concrete recycled micro powder.The solid waste-based green nano composite crystal seed early strength agent disclosed by the application uses the steel slag powder and the waste concrete recycled micro powder as raw materials, is low in cost, reduces the environmental pollution caused by solid waste, is green and environment-friendly, and is simple in process.

The application relates to the technical field of nanocomposites, in particular to a kind of macromolecule@cuprous oxide composite crystal particles and a preparation method thereof.The specific technical scheme is as follows: a kind of macromolecule@cuprous oxide composite crystal particles, the composite crystal particles take macromolecule nanoparticle as guest particle, cuprous oxide as host crystal, make the guest particle disperse in the host crystal and form macromolecule@cuprous oxide composite crystal particles, solve the problem of oxygen vacancy defect distribution regulation in cuprous oxide crystal.

The invention relates to the technical field of nano composite materials, in particular to a gold nanoparticle and zinc oxide composite crystal particle and a preparation method thereof. The preparation method comprises the following steps: dispersing gold nanoparticles with stable polymers and a diblock polymer in a zinc oxide precursor solution, uniformly mixing, and reacting to form gold nanoparticle-zinc oxide composite crystal particles; according to the composite crystal particle, polymer-stable gold nanoparticles are used as object particles, zinc oxide is used as a main crystal, a diblock polymer is used as a crystal growth regulator, and the object particles are dispersed in the main crystal to form the gold nanoparticle and zinc oxide composite crystal particle with uniform size and morphology, so that the problems that the morphology and the size of zinc oxide are not uniform; and moreover, the composite crystal has excellent photocatalytic performance.

The invention relates to a method for realizing bonding growth of rare earth doped fluoride and pure fluoride crystals, and belongs to the technical field of crystal growth. Aiming at the technical problems of high requirement on polishing quality of a pre-bonding surface, sudden change of refractive index of a bonding interface, limited bonding area and the like in the existing crystal bonding method, one of a pure fluoride host crystal or a rare earth doped fluoride crystal is selected as a seed crystal; then weighing and mixing the raw materials according to the stoichiometric ratio of another bonded crystal component, pressing the raw materials into a raw material block, finally putting the seed crystal and the raw material block into a crucible in sequence, and realizing the bonding growth of the rare earth doped fluoride and pure fluoride crystal by adopting a temperature gradient method or a Bridgman-Stockbarger method. And finally obtaining the composite crystal formed by bonding the pure fluoride crystal and the rare earth ion doped fluoride crystal. According to the composite crystal grown by the method, sudden change of the refractive index at the bonding interface is avoided, the preparation cost of the composite crystal element is reduced, and the laser performance of the bonding gain element is improved.

The present invention relates to the technical field of early strength agents, and more particularly to a kind of in-situ composite crystal seed type early strength agent and its preparation method and application. The present invention is carried out ball milling reaction by mixing calcareous raw material, siliceous raw material, quicklime and dispersant and water, and then spray drying to obtain an in-situ composite crystal seed type early strength agent. The constituent components of the in-situ composite crystal seed type early strength agent include sodium sulfate and C-S-H seed crystals. The in-situ composite crystal seed type early strength agent of the present invention is reasonable in composition, can play the synergistic effect (1+1>2) of C-S-H seed crystals and traditional early strength agents, is applied to large-volume slag cement, and early strength effect is remarkable, and late-stage strength does not shrink. The preparation process of the present invention is simple, raw materials are cheap and easy to obtain, and cost is low, seed particle size is small and particle size distribution is uniform, performance is relatively stable, and it is easy to store, transport and use, and is very suitable for industrialized mass production.

The invention provides colorful metal glaze, a preparation method thereof and a ceramic product, and belongs to the technical field of ceramic materials. The colorful metal glaze comprises basic glaze, a nano composite nucleating agent, a metal coloring agent and a rare earth toner, the nano composite nucleation agent is a nano particle with a core-shell structure. The ceramic product prepared by the invention has stable, uniform and strong metallic luster and lasting color, not only solves the problems of strong color development dependence, insufficient glaze surface stability, poor component synergism and the like of the existing metal glaze, but also improves the quality and artistic value of the ceramic product, and has wide market application prospects.

The invention provides a composite crystal modifier and a preparation method of alpha type semi-hydrated gypsum. According to the preparation method of the alpha-type semi-hydrated gypsum, the composite crystal modifier, the industrial byproduct ardealite and the salt-alcohol mixed solution are adopted, the alpha-type semi-hydrated gypsum is prepared by adopting a normal-pressure solution method, the prepared alpha-type semi-hydrated gypsum is good in crystal transformation, excellent in product quality, simple in process, high in efficiency and low in energy consumption, the ardealite waste can be utilized, and the production cost is reduced. Resource circulation is realized; according to the present invention, the short column-shaped alpha-type semi-hydrated gypsum crystal can be prepared, and the drying compressive strength can achieve 30.56-35.15 Mpa, the a25-grade product in the building material industry national standard JCT 20382010 alpha-type high-strength gypsum standard can be prepared at the low temperature within the short time, and the advantage of the standard product preparation with the low energy consumption is prominent.

The application belongs to the technical field of quantum dot glass ceramics, and relates to high-fluorescent quantum yield quantum dot glass ceramics, a preparation method and application thereof. The high-fluorescent quantum yield quantum dot glass ceramics takes LiAlSiO4 as a main crystal phase, and forms a dendrite-spherulite composite crystal structure; a light emitting center is a CsPbBr3 quantum dot; during preparation, a batch of base glass is ground after being melt water-quenched to obtain base glass powder, then a layered and relatively sealed loading process is adopted, the quantum dot precursor is first placed at the bottom of a crucible, the base glass powder is covered, a crucible cover is then overlaid, and after being melt homogenized, the glass is cast into a shape, and finally, the glass in the shape is subjected to controlled heat treatment to obtain the high-fluorescent quantum yield quantum dot glass ceramics; the high-fluorescent quantum yield quantum dot glass ceramics can be widely applied to high-power laser lighting and display devices. The application realizes efficient packaging while significantly improving the fluorescent quantum yield, and has a wide application prospect.

The invention discloses a ternary composite crystal form conversion accelerant and a method for preparing ultra-pure titanium dioxide through the ternary composite crystal form conversion accelerant, and relates to the field of material preparation, the ternary composite crystal form conversion accelerant comprises a substance A, a Zn (NO3) 2 aqueous solution and Nb2O5 powder, the substance A is Sb-doped SnO2 crystals, the molar ratio of Sb / (Sn + Sb) is 3%-8%, and the molar fraction of Sb < 5 + > in all Sb elements is larger than or equal to 80%; the oxygen vacancy concentration of the substance A is 5 * 10 < 18 > cm <-3 > to 2 * 10 < 19 > cm <-3 >; the surface hydroxyl density of the substance A is 2.5 mmol / g to 4.0 mmol / g, and the free hydroxyl accounts for more than or equal to 70%; the Nb2O5 powder is in a monoclinic phase, the crystallinity is 65%-80%, and the specific surface area is 50 m < 2 > / g-80 m < 2 > / g. The ternary composite crystal form conversion accelerator can reduce the calcination temperature and realize low-temperature calcination to prepare ultra-pure titanium dioxide.

This invention relates to the field of nanocomposite materials technology, and more particularly to a gold nanoparticle@zinc oxide composite crystal particle and its preparation method. The invention involves dispersing polymer-stabilized gold nanoparticles and a diblock polymer in a zinc oxide precursor solution, mixing them uniformly, and reacting to form gold nanoparticle@zinc oxide composite crystal particles. These composite crystal particles use polymer-stabilized gold nanoparticles as guest particles, zinc oxide as the host crystal, and the diblock polymer as a crystal growth regulator. This allows the guest particles to be dispersed within the host crystal, forming gold nanoparticle@zinc oxide composite crystal particles with uniform size and morphology. This solves the problems of uneven morphology and single chemical composition of zinc oxide, and the composite crystal exhibits excellent photocatalytic performance.

The application belongs to the technical field of automobile exhaust purification catalytic materials, and particularly relates to a kind of oxygen defect Pt (111 / 200) composite crystal face atomic level PtM supported rod-shaped La-Al2O3 catalytic materials and its preparation method and application, wherein the catalytic material includes carrier and its supported active ingredient, the carrier is rod-shaped La-Al2O3;Active ingredient is atomic level PtM composite material, Pt and M in it exist in the form of nano-particle, single atom, diatomic and few atom cluster;And Pt exists 111 and 200 composite crystal face;M includes at least one of Pd, Co, Mn and Cu;The carrier and / or active ingredient has oxygen defects.The catalyst improves the molecular activation capacity, low-temperature catalytic oxidation activity and anti-aging stability, and can improve the automobile exhaust catalytic oxidation treatment effect.

The application discloses a low-cost lithium-free microcrystalline glass and a preparation method and application thereof, and belongs to the technical field of electronic cover plate materials. The microcrystalline glass takes pre-melted micro-powder of sodium feldspar 69-75% and in-situ synthesized micro-powder of calcium feldspar as main raw materials, is supplemented with a ZrO2 / TiO2 composite crystal nucleus agent 2.1-4.5%, and a small amount of MgO, CaO and K2O performance adjusting groups. The microcrystalline glass is obtained by two-stage melting at 1430-1480 DEG C in a weak reduction-neutral atmosphere, overflow down-draw forming, gradient annealing, two-stage crystallization at 650 DEG C nucleation and 735-770 DEG C crystallization, and K + / Na + ion exchange strengthening, and has high transmittance, high surface compressive stress, high hardness and excellent drop resistance. The application discards lithium resources and high-purity alumina, reduces raw material cost and energy consumption, and is suitable for electronic device cover plates such as smart phones.

The invention relates to the technical field of high polymer materials, in particular to a low-frequency response degradable self-reinforced piezoelectric composite material and a preparation method thereof. The self-reinforced piezoelectric composite material is prepared from the following components: stereocomplex polylactic acid and hydroxyapatite, the content of the hydroxyapatite is 5-30 wt% of the content of the stereocomplex polylactic acid; the low-frequency response degradable self-reinforced piezoelectric composite material has a mesoporous structure. The crystal of the degradable self-reinforced piezoelectric composite material with low-frequency response is a 100% stereocomplex crystal, and has excellent piezoelectric property.

The invention provides a composite crystal lithium manganate material, a lithium ion battery and a preparation method, and relates to the technical field of lithium ion batteries. The composite crystal lithium manganate material is composed of a monoclinic layered structure, an orthogonal layered structure and a tetragonal distorted spinel structure according to different proportions. By regulating and controlling the proportion of the three crystal structures, stable lithium manganate and capacitive lithium manganate can be obtained, and the capacity or cycle performance of the material can be improved. And the preparation method of the composite crystal form lithium manganate material is simple, controllable in condition and suitable for large-scale production.

This invention discloses an antioxidant rare earth alloy modifier and its preparation method. The rare earth alloy modifier has a fine-grained surface and columnar crystals inside. The thickness of the fine-grained surface region is 0.1~2mm, and the grain size is 100nm~1000μm. The width of the columnar crystals inside is ≥1mm, and the area of ​​the columnar crystal region accounts for 90%~99.5%. The proportion of longitudinal grain boundaries inside the rare earth alloy modifier is ≥95%, and the orientation deviation of the longitudinal grain boundaries is ≤25°, of which the proportion of small-angle grain boundaries below 15° is 10%~90%. By constructing a composite crystal structure of fine-grained surface and columnar crystals inside, oxygen permeation is hindered and the oxygen diffusion barrier is increased, significantly improving the intrinsic antioxidant performance of the rare earth alloy modifier. This solves the technical problems of existing technologies, such as the lack of durability of physical isolation protection, high cost of composition optimization, and difficulty in fundamentally inhibiting oxygen permeation.

The invention belongs to the technical field of laser oscillators, and particularly relates to a pump light parametric oscillator based on a composite crystal. The optical parametric oscillator comprises a pumping source and a resonant cavity, the pumping source comprises a laser and a gain medium for receiving initial laser emitted by the laser, the laser and the gain medium are sequentially arranged in the optical path direction of the optical parametric oscillator, and the gain medium is a composite crystal. The composite crystal comprises neodymium-doped yttrium aluminum garnet and yttrium aluminum garnet fixedly connected with the neodymium-doped yttrium aluminum garnet; the resonant cavity comprises a nonlinear crystal, and the nonlinear crystal comprises selenium gallium barium. The optical parametric oscillator provided by the invention can simultaneously realize high-energy output of the pumping source, high-power and high-stability output of the pumping source and high-energy output of the resonant cavity covering the whole middle and far infrared band, and has wide application prospects in the fields of middle infrared confrontation, environment and atmosphere monitoring and remote sensing.

The invention discloses a high-temperature-resistant impact-resistant polylactic acid composite material, a preparation method thereof and an air conditioner, and belongs to the technical field of air conditioner materials. According to the technical scheme, the material comprises stereocomplex polylactic acid and modified short carbon fibers, the stereocomplex polylactic acid is prepared by dissolving L-polylactic acid and D-polylactic acid in a solvent, adding a nucleating agent for reaction, and controlling the solution volatilization rate and applying an electrostatic field after reaction to realize molecular orientation ordered arrangement. The preparation method is applied to the aspect of air conditioner materials, the problem that when the stereocomplex polylactic acid and other functional materials are compounded and then subjected to melt processing again, an original stereocomplex crystal structure is extremely prone to being damaged is solved, in the subsequent melt processing process of the obtained stereocomplex polylactic acid, the stereocomplex crystal retention rate is high, and the stability of the stereocomplex polylactic acid is improved. The stereocomplex polylactic acid is combined with the modified short carbon fibers, so that the heat resistance of the polylactic acid is remarkably improved, and the heat-resistant temperature of the polylactic acid is up to 120 DEG C and reaches the heat-resistant level of ABS / PP (Acrylonitrile Butadiene Styrene / Polypropylene).

The application discloses an environment-friendly high-strength granite-imitated super-thick brick and a preparation method thereof. The brick comprises 5-30 parts of clay, 5-60 parts of aluminum ash, 1-20 parts of sand-shaped brick slag waste, 1-20 parts of sand-shaped granite slag waste and 1-20 parts of sand-shaped glass slag waste. The thickness of the brick is 30-60 mm, and the water absorption rate is 2-8%. The environment-friendly high-strength granite-imitated super-thick brick utilizes the gap between the sand-shaped waste and the clay, so that the green body has a good exhaust passage during the sintering process, thereby avoiding the technical problem that the green body is too thick, the bubbles cannot be exhausted, and product defects such as black core, bubbles and collapse are easily formed. Meanwhile, the aluminum ash contains a large amount of aluminum oxide, silicon dioxide and magnesium oxide and other substances, and forms a super-high-strength composite crystal phase system with other waste and clay, so that the product has high compressive and destructive strength, is not easy to break, maintenance cost is reduced, and the service life of the product is prolonged.

The invention relates to the technical field of crystal fiber preparation, in particular to a method for preparing calcium sulfate whiskers based on calcium chloride mother liquor. The method comprises the following steps: diluting a calcium chloride mother solution to obtain a diluted calcium-containing solution; mixing a seed crystal, a composite crystallization promoting agent and the diluted calcium-containing solution to obtain a mixed solution; wherein the composite crystallization promoting agent comprises gelatin and polyvinyl alcohol; dropwise adding sulfuric acid into the mixed solution, and stirring and dissolving in a gradient heating manner to obtain calcium sulfate-containing slurry; aging the calcium sulfate-containing slurry to obtain aged slurry; and sequentially filtering, washing, vacuum drying and dispersing the aged slurry to obtain the calcium sulfate whisker. According to the method, the length-diameter ratio of the calcium sulfate whisker is finally increased through three core links of directional regulation and stabilization of the composite crystallization promoting agent, an ordered growth environment with gradient temperature rise and aged crystal optimization. The average length of the final calcium sulfate whisker is 753 microns, and the average length-diameter ratio is greater than or equal to 27.82.

A method for preparing high-purity anhydrous II-type gypsum through brick pressing and steam pressing of industrial byproduct gypsum comprises the steps that S1, raw material treatment is conducted, specifically, a phosphogypsum raw material, an alkaline material and a composite crystal modifier are mixed to obtain a mixture, the mixture is aged and then subjected to brick pressing, and a mixture block is prepared; s2, performing steam curing and crystal transformation: stacking the mixed material blocks on a steam curing trolley, feeding the mixture blocks into a steam curing kettle, and performing steam curing at the temperature of lower than 195 DEG C to obtain gypsum bricks; s3, homogenizing and drying: naturally homogenizing and drying the gypsum bricks in a homogenizing silo, and crushing and grinding when attached water is reduced to 3%, so as to obtain the high-purity anhydrous II-type gypsum. The II-type anhydrous gypsum is prepared by adopting a method of steam curing, natural homogenization drying and crushing and grinding, and the steam curing temperature is controlled within 195 DEG C, so that the treated product is ensured to reach a safe and stable state, and the pH value of the treated product is stabilized at 6-9. Anhydrous II gypsum is prepared from a large amount of consumed phosphogypsum, direct resource utilization is achieved, the process is simple, energy consumption is low, and the national green and energy-saving requirements are met.

The invention belongs to the technical field of gypsum materials, and discloses a preparation method of alpha-semi-hydrated gypsum based on a composite crystal modifier. The preparation method comprises the following steps: mixing sodium sulfate, dodecyl trimethyl ammonium bromide and water, and then drying to obtain a composite crystal modifier; and mixing the composite crystal modifier with water to obtain a crystal modifier solution, then adding phosphogypsum, and carrying out a reaction to obtain the alpha-semi-hydrated gypsum. The alpha-semi-hydrated gypsum is prepared by using the composite crystal modifier, the production cost is low, the process is simple, the reaction condition is mild and environment-friendly, and the mechanical property of the product is excellent. The breaking strength of the alpha-semi-hydrated gypsum can reach about 11 MPa, the compressive strength can reach about 45 MPa, and the alpha-semi-hydrated gypsum meets the a40 grade requirement of the JCT 2038-2010 standard of alpha-type high-strength gypsum.

The utility model relates to a composite laser crystal growing device which structurally comprises a barrel body, a lifting support column, a tray, a heat preservation brick, a crystal, a heat preservation barrel, a heating body, a crucible, raw materials and a heat preservation felt, the heat preservation brick is arranged at the bottom of the heat preservation barrel, the barrel type crucible penetrates through the center of the heat preservation brick, the bottom of the crucible is supported on the tray, and the tray is connected with the lifting support column. The bottom of the insulating brick is connected with a barrel body, the barrel body covers the bottom of the crucible and the outer sides of the lifting support column and the tray, a crystal matched with the inner diameter of the crucible is placed at the inner bottom of the crucible, raw materials are placed in the crucible above the crystal, a heating body covers the outer side of the crucible in the insulating barrel, the bottom of the heating body is supported on the insulating brick, and a gap is reserved between the heating body and the crucible; the top of the insulation barrel is provided with insulation felt. The device disclosed by the utility model has the advantages of reasonable structural design, simplicity in operation, low cost, omission of multiple crystal surface treatment procedures, capability of producing composite laser crystals with larger sizes and higher production quality, and can be used for growing composite crystals by using a Bridgman-Stockbarger method.

A device and method for centrifugally synthesizing and growing a compound crystal, which relate to the field of preparation of compound semiconductors. The device comprises a furnace body and a crucible in the furnace body, wherein a sealing groove is formed in the top of the crucible, a sealing cover matching the sealing groove is provided, and the crucible is connected to a centrifugal electric motor outside the furnace body by means of a crucible rod. The method comprises the steps of placing a raw material, assembling the device, sealing the crucible, performing centrifugal synthesis, and growing a crystal.