1240 results about "Microcrystalline" patented technology

The invention discloses a glass ceramic thickness detection method and a related device, and the method comprises the steps: obtaining a vibration signal generated in a glass ceramic thinning and grinding process, and extracting a vibration dominant frequency, a frequency spectrum centroid frequency and a frequency band energy distribution ratio as thickness characteristic parameters through fast Fourier transform processing; three-dimensional position coordinates of the grinding head are obtained, space mapping and weighted average processing are conducted on the thickness characteristic parameters, and space distribution of the thickness characteristic parameters is obtained; performing process interference compensation and sliding window time sequence smoothing processing according to the grinding process parameters to obtain stable thickness characteristic distribution; based on the stable thickness feature distribution and the current grinding process, final thickness distribution is predicted, and a thickness qualification pre-judgment result is obtained; and extracting a time sequence change characteristic of the thickness characteristic parameter as a vibration evolution index, and performing comprehensive quality evaluation in combination with a thickness eligibility pre-judgment result. According to the scheme, the thickness can be detected in real time in the thinning and grinding process of the microcrystalline glass, and the production efficiency is improved.

The application provides a microcrystalline glass product, and components of the microcrystalline glass product are shown in percentage by weight, and the microcrystalline glass product contains SiO2: 40-55%; Al2O3: 15-30%; Li2O: 0.1-6%; ZnO: 9-20%; MgO: 0.1-6%; and TiO2: 0.5-7%. Through reasonable component design, the microcrystalline glass product obtained by the application has excellent mechanical properties and is suitable for display devices or electronic devices.

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 discloses a porous ceramic filter for liquid magnesium alloy purification and a preparation method thereof, and the porous ceramic filter comprises the following raw materials in percentage by mass: 70-85wt% of ceramic particles, 8-15wt% of multi-element oxide system microcrystalline glass brazing filler metal and the balance of a binder, al2O3-B2O3-SiO2-MgO-CaO multi-element oxide system microcrystalline glass brazing filler metal is adopted, under the condition of air atmosphere high-temperature calcination, a compact reaction layer containing a low-melting-point glass phase, an aluminum oxide phase, a magnesium aluminate spinel phase, a calcium aluminosilicate phase, a borate phase and a silicate phase is generated on the surfaces of ceramic particles of a porous ceramic filter through a chemical reaction; the magnesium alloy filter has high strength and good high-temperature stability, and the problems that the filter loses efficacy and magnesium alloy melt is polluted due to the fact that the filter is eroded by magnesium alloy liquid are effectively solved.

The invention discloses a microcrystalline texture glass cover plate and a preparation method thereof. The microcrystalline texture glass cover plate comprises a glass body; a series of surface microstructures are arranged on the surface of the glass body, the section of each surface microstructure is in a wave shape, compared with a common glass cover plate, the glass cover plate is endowed with more excellent optical and mechanical performance due to the special structure of the microcrystalline glass, and the requirements of high-end markets are better met when the glass cover plate is applied to consumer electronics cover plates. The diversification of the MASK design provides diversification of the texture effect of the microcrystalline glass, and specific requirements are met. And the surface of the microcrystalline glass is processed more accurately by the yellow light development technology and reaches the micron level. Pyramid morphology of particles on the surface of the microcrystalline glass is regulated and controlled through a wet etching process, uniform etching is carried out, the texture effect is brighter, and the hand feeling is finer and smoother.

A coating composition for a substrate, which includes: a microcrystalline cellulose composition, at least one silane, at least one acid catalyst, a liquid dispersion phase, and optionally at least one inorganic filler. Also, the use of this composition for the release coating of a substrate such as a paper surface or a metal surface. Finally, an article having at least one surface is coated with the coating composition.

The invention discloses a negative electrode material and a preparation method and application thereof. The negative electrode material comprises an inner core and a coating layer coated outside the inner core, the inner core is microcrystalline graphite with a porous structure, the coating layer is a carbonized material and comprises a cross-linking layer and a compact layer, the surface of the microcrystalline graphite is coated with the cross-linking layer, and the surface of the cross-linking layer is coated with the compact layer; wherein the cross-linking layer is formed by carbonizing heavy components in a coating agent on the surface of the microcrystalline graphite, the compact layer is formed by carbonizing weak polar groups in the coating agent, and the graphitization degree of the compact layer is greater than or equal to 94%. The negative electrode material disclosed by the invention can effectively reduce side reaction and structural breakage in the charge-discharge process, enhance the overall conductivity, and finally improve the first efficiency, the specific capacity and the cycling stability of the battery.

The invention belongs to the technical field of aluminum alloy material preparation, and particularly relates to an optical microcrystalline aluminum material, a preparation method and application, an aluminum alloy ingot is extruded twice to obtain an extruded bar, the extrusion temperature is 275-325 DEG C and the extrusion ratio is 2-8 during primary extrusion, and the extrusion temperature is 375-425 DEG C and the extrusion ratio is 20-30 during secondary extrusion; the extruded bar is sequentially subjected to annealing treatment, drawing treatment and stabilizing heat treatment, the optical microcrystalline aluminum material is obtained, and the temperature of the stabilizing heat treatment is 90-240 DEG C; the grain size and the surface roughness are reduced, and meanwhile the hardness is improved.

The invention relates to an electronic component material technology, and aims to provide an LTCC (Low Temperature Co-Fired Ceramic) material with low dielectric constant and low dielectric loss and a preparation method thereof. The LTCC material is prepared from zinc borosilicate glass and zinc borosilicate microcrystalline glass with different softening point ranges, a ceramic filler, silicate and a metal oxide through ball milling, mixing, modeling and sintering, and the material contains Zn2SiO4 with a devitrified phase. According to the invention, two kinds of zinc borosilicate glass with different softening points are adopted as cooling assistants, and a devitrified phase Zn2SiO4 is generated through reaction in the sintering process, so that the problem of large dielectric loss of a composite system caused by more glass phases can be effectively improved; by flexibly regulating and controlling the content of each component and the components of the auxiliary materials, the sintering characteristics of the glass internal component regulation and control material are optimized, and the success rate of matching and co-firing of the material and silver is further improved; meanwhile, the sintering window is relatively wide, so that good quality stability of the product is favorably kept; the dielectric loss of the composite system is reduced by doping the nucleating agent, and the volume shrinkage process of the material is regulated and controlled.

The invention relates to the technical field of metal powder material preparation, and particularly discloses antimony-doped cesium terbium chloride microcrystalline powder and a preparation method thereof. The chemical composition of the microcrystalline powder is Cs < 5 > Tb < 1-x > Sb < x > Cl < 8 >. 6H < 2 > O, wherein x is equal to 0.05 to 0.30. The preparation method comprises the following steps: mixing cesium chloride, terbium chloride hexahydrate and antimony trichloride according to a molar ratio of 5: 0.8: x; adding pyridine hydrochloride as a chlorine element supplement, wherein the dosage of the pyridine hydrochloride is that 0.05-0.20 mmol of Py.HCl is used for every 1 mmol of CsCl; adding stearic acid as a process dispersant; and through combined treatment of mechanical ball milling and freeze drying, antimony-doped cesium-terbium-chlorine microcrystal powder with regular morphology and good dispersibility is obtained. The method is simple in process and mild in condition, particle aggregation can be effectively inhibited, the crystallinity and dispersion uniformity of the powder are improved, and the prepared microcrystal powder shows excellent optical performance.

This disclosure provides a microcrystalline scintillation glass array and a scintillator detector, relating to the field of radiation detection technology. The microcrystalline scintillation glass array includes: at least one layer of microcrystalline scintillation glass array, each layer comprising multiple microcrystalline scintillation glasses, each microcrystalline scintillation glass comprising a glass substrate and multiple microcrystals coated on the glass substrate; wherein the fabrication process of the microcrystalline scintillation glass includes incorporating microcrystals into the glass, and the material used to form each microcrystal includes a scintillator. Since the scintillator in the microcrystalline scintillation glass array is only incorporated into the glass in the form of microcrystals, the amount of scintillator required to fabricate the microcrystalline scintillation glass array is small, resulting in low cost. Furthermore, in the microcrystalline scintillation glass, the glass coating of the microcrystals provides a sealed environment for the microcrystals, making them less prone to deliquescence, and the protective effect of the glass broadens the application environment of the microcrystalline scintillation glass.

The present application relates to the technical field of sodium-ion batteries, in particular to a sodium ion battery cathode material, a preparation method thereof, and a sodium ion battery, in an XRD spectrogram of the cathode material, the characteristic diffraction peak A of (003) crystal plane and the characteristic diffraction peak B of (104) crystal plane are arranged at 2θ of 15-19° and 39-44°, respectively; wherein the microcrystalline size DA of the characteristic diffraction peak A and the microcrystalline size DB of the characteristic diffraction peak B satisfy the following condition: 1.3≤DA / DB≤2.5, wherein DA and DB correspond to the microcrystalline sizes of the (003) crystal plane and the (104) crystal plane in the perpendicular line direction, respectively.

The invention provides an arc-shaped microcrystalline glass plate structure performance detection system, and belongs to the technical field of material performance testing. The system comprises a rack, a sample table, an impact mechanism, a swing rod, a swing part, a driving assembly and a medium taking and supplying assembly, the sample table is provided with an arc-shaped supporting surface and a medium cavity; the impact mechanism is positioned above the arc-shaped supporting surface; the swing rod is provided with a sliding channel. The bottom end of the swinging piece is used for driving the sample table to rotate; the driving assembly comprises a rotating output shaft, a transmission arm and a transmission sliding block which are connected in sequence, the rotating output shaft is connected to the rack and is parallel to the rotating shaft of the swing rod, and the transmission sliding block is contained in the sliding channel in a sliding mode; the medium taking and supplying assembly comprises a piston barrel and a piston rod, the piston barrel is fixedly connected with the swing rod and provided with a one-way inflow port and a one-way outflow port communicated with the medium cavity, a piston of the piston rod is slidably sealed with the piston barrel, and a rod body is in transmission connection with the transmission sliding block. The system can realize multi-position and variable-temperature detection, and the detection reliability is higher.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass. The application makes the surface composition and stress structure of the chemically strengthened microcrystalline glass with lithium disilicate as the main crystal phase meet specific requirements, so that the chemically strengthened microcrystalline glass can meet high stress levels and also ensure good weather resistance, and can better ensure that the chemically strengthened microcrystalline glass meets application requirements.

The invention belongs to the technical field of glass materials, and particularly relates to black high-hardness heat-resistant microcrystalline glass ware and a preparation method thereof. Silicon dioxide, sodium oxide, aluminum oxide, potassium oxide, boric oxide, magnesium oxide, calcium oxide, zinc oxide, sodium fluosilicate, iron oxide, manganese oxide, fluorite, lithium oxide, metal manganese coated with silicon dioxide and schorlite are used as raw materials, and the black high-hardness heat-resistant microcrystalline glass ware is prepared through the processes of high-temperature melting and mixing, compression molding, annealing and tempering. The black high-hardness heat-resistant microcrystalline glass ware is excellent in performance, high in hardness and good in heat resistance, and has potential market value.

The invention provides a high-precision optical microcrystalline glass analysis system, and belongs to the technical field of microcrystalline glass detection. Wherein the detection core is arranged in the cylinder body in a sliding fit manner. The sleeve is connected with the detection core. One end of the driving rod is in sliding fit with the sleeve, and the other end is in transmission fit with the second driver. And a first elastic piece is abutted between the driving rod and the sleeve. The liquid storage pipe is arranged in the vertical direction, and the barrel is communicated with the liquid storage pipe. During detection, the controller is used for controlling the first driver to drive the barrel to be close to the objective table, so that the distance between the detection core and the objective table is a first preset distance. The controller is also used for determining the distance between the detection core and the surface of the glass-ceramic standard component according to the first preset distance and the thickness of the glass-ceramic standard component, and recording the distance as a standard distance. The controller is further used for controlling the second driver to drive the detection core to move towards the objective table by a second preset distance, and the second preset distance is larger than the standard distance. On the basis of guaranteeing the detection precision, the structure simplification and the low cost are realized at the same time.

The invention relates to the field of microcrystalline glass, and provides high-hardness microcrystalline glass and a preparation method thereof. The high-hardness microcrystalline glass is prepared from the following raw materials in percentage by mole: 50 percent to 65 percent of SiO2, 15 percent to 25 percent of Al2O3, 10 percent to 18 percent of MgO, 3 percent to 8 percent of Li2O, 2 percent to 5 percent of ZrO2, 0.5 percent to 2 percent of Y2O3, 1 percent to 3 percent of B2O3, 0.5 percent to 2 percent of ZnO and 0.1 percent to 1 percent of CeO2. According to the high-hardness glass ceramic provided by the invention, the hardness, wear resistance and other properties of the glass ceramic are effectively improved, and the stability of the properties is improved.

The present invention provides a novel crystal seed suitable for a crystallization fluidized bed, a preparation method thereof, and an application thereof. The performance and function of the crystal seed are optimized and improved, the crystallization rate is accelerated, the crystallization speed is shortened, and the crystal nuclei can be effectively fixed on the surface of the crystal seed during the hardness removal process, thereby avoiding the formation of microcrystalline nuclei in the water body, reducing scaling, and accelerating the start-up speed of crystallization. In addition, the preparation method of the novel crystal seed is simple and the performance is stable. According to tests, when the novel crystal seed prepared by the present invention is put into a crystallization fluidized bed reactor for a hardness removal process, the hardness removal rate can reach 85%-95%.

The invention discloses a surface defect detection system based on a microcrystalline glass panel finished product, and relates to the technical field of surface defect detection. The defect full-dimensional dynamic state map construction module is used for constructing and updating a defect full-dimensional dynamic state map containing defect three-dimensional coordinate information, multi-modal feature confidence information, virtual-entity parameter deviation information and feature definition-registration precision linkage threshold information in real time; the structured light three-dimensional contour acquisition module is used for acquiring three-dimensional contour data of the surface of the microcrystalline glass panel; the multi-modal feature fusion module is used for collecting two-dimensional image data of multi-light-source imaging and extracting multi-modal feature information; the digital twin virtual debugging module is used for constructing a virtual detection environment based on the defect full-dimension dynamic state graph; the problem of feature confusion caused by light source combinational logic solidification in an existing multi-light-source switching system is effectively solved.

The invention discloses a method for synthesizing a high-crystallinity zeolite molecular sieve through in-situ crystallization of aluminosilicate minerals, and belongs to the technical field of zeolite molecular sieve synthesis. The preparation method comprises the following steps: preparing a crystal nucleus liquid containing zeolite molecular sieve microcrystals and a solid-phase wafer; mixing aluminosilicate minerals with the crystal nucleus liquid, and respectively roasting at 850-1000 DEG C and 650-800 DEG C to prepare an active mineral silicon source and an active mineral aluminum source; and mixing the active mineral source with additional silicon species, NaOH, a template agent, a crystal nucleus liquid, a solid-phase wafer and water, crystallizing at 90-150 DEG C, and post-processing to obtain the high-crystallinity zeolite molecular sieve. By introducing the crystal nucleus liquid and the solid-phase wafer, silicon and aluminum components in the aluminosilicate mineral are promoted to be converted into the target molecular sieve in situ, the crystallinity of the product is remarkably improved, the synthesis cost is reduced, and the method is suitable for the fields of petrochemical engineering, environmental protection and the like.

The invention belongs to the technical field of electronic ceramic substrate materials, and particularly relates to a preparation method of a microcrystalline glass composite silicon nitride ceramic substrate, which is prepared from the following raw materials: 1-5% of alpha-phase silicon nitride powder, 86-95% of beta-phase silicon nitride powder, 0.2-3% of metal silicon powder, 2.5-8% of glass powder and 1.3-8% of metal oxide. The preparation method comprises the following steps: S1, mixing and grinding raw materials to obtain ceramic slurry; s2, adding Arabic gum into the ceramic slurry as a binder, and carrying out spray granulation; granulation powder is obtained; s3, carrying out dry pressing molding and cold isostatic pressing treatment on the granulation powder to prepare a ceramic plate blank; and S4, sintering and crystallizing the ceramic plate blank. According to the invention, the glass ceramic powder is introduced as a sintering aid and a second phase, and the sintering temperature of the silicon nitride is obviously reduced from the conventional temperature of more than 1800 DEG C to 1500 DEG C by utilizing the liquid phase effect of the glass ceramic powder in the sintering process, so that two modes of air pressure sintering and normal pressure sintering can be used, and the energy consumption and the requirements on equipment are reduced.

The invention discloses a low-temperature preservation method of a prepared meat product, and belongs to the technical field of food processing. In order to solve the technical problems that in the low-temperature storage process of the conditioned meat product, microorganism control is not thorough, secondary pollution and fat oxidation aggravation are caused by accumulation of high-oxygen conditioned packaging condensate water, and texture damage is caused by ultrahigh-pressure treatment, metal ion catalysis is blocked through phytic acid pretreatment, oxidation is inhibited through composite antioxidant vacuum rolling and kneading, and the quality of the conditioned meat product is improved. Gradient ultrahigh pressure destroys microbial structures in stages, citric acid and a D-ribose buffer solution block damaged thalli from repairing, a composite packaging bag is lined with a hygroscopic film and filled with high-oxygen mixed gas to maintain meat color and adsorb condensate water, and finally, the composite packaging bag is deeply frozen to form a microcrystalline structure and then transferred to an ice-temperature environment for storage. The method realizes microbial safety control under the condition of no chemical preservative, effectively maintains the cell integrity of meat products, reduces juice loss and fat oxidation, prolongs the shelf life and maintains the eating quality.

The invention provides a coated microcrystal lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The positive electrode material is a lithium-rich manganese-based positive electrode material which is prepared from a lithium-rich manganese-based precursor and has primary particles formed in situ and secondary spheres with surface coatings. The positive electrode material has a unique core-shell structure, the core is a microcrystal lithium-rich material, the shell is a nanoscale solid electrolyte layer, and the shell layer coats primary particles and secondary spheres at the same time; the structure effectively inhibits the interface side reaction between the positive electrode material and the solid electrolyte, and stabilizes the interface structure; a continuous and short Li and charge transmission path is provided, the interface impedance in an all-solid-state battery is remarkably reduced, and the rate capability and the cycling stability of the material are improved.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass; through the high lithium content microcrystalline glass with a specific composition and taking lithium disilicate as a main crystal phase, after chemical strengthening treatment, specific stress characteristics are met, especially the relationship between the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic relationship A meets specific requirements, that is, the range requirement of the relationship B is met, not only can the problem of "surface cracking" of the prepared chemically strengthened microcrystalline glass be effectively overcome, but also the chemically strengthened microcrystalline glass can be ensured to have high mechanical strength performance, and further the chemically strengthened microcrystalline glass can be ensured to have excellent damage resistance.

The invention discloses a boron doping method, a boron doping structure and a back contact battery. The method comprises the following steps: step 1) pre-crystallization treatment; step 2) pre-oxidation; (3) boron diffusion; wherein the pre-crystallization treatment is to treat the amorphous silicon layer in the silicon wafer base material in a gradient variable pressure mode in an inert gas atmosphere. According to the method, before pre-oxidation and boron diffusion, amorphous silicon is converted into microcrystalline silicon in a gradient transformation manner, and gradual crystallization is realized, so that lattice stress is reduced, gradient distribution of grain sizes can be realized, the problem of uneven grain sizes caused by a single crystallization condition and the problem of doping concentration fluctuation caused by an unordered structure of the amorphous silicon are avoided, and the yield of the amorphous silicon is improved. According to the method, the boron atoms can be transferred to a balance position more easily, an ordered structure is formed, the distribution is more uniform, the boron-doped structure with better sheet resistance uniformity is obtained, and the photoelectric conversion efficiency of the back contact battery based on the boron-doped structure is further improved.

The invention provides a high-temperature solid heat storage material based on industrial solid waste, a preparation method of the high-temperature solid heat storage material and a heat storage pile, and belongs to the technical field of energy and new energy storage and energy saving materials. The high-temperature solid heat storage material is prepared by introducing three functional additives with a synergistic effect: a composite alkali-boron activator is used for bonding and forming solid waste raw materials through a geological polymerization reaction at a low temperature, and is converted into a fluxing agent at a high temperature to promote low-temperature densification of the material; a core-shell structure thermal conductivity reinforcing agent with an anti-oxidation glass shell layer constructs an efficient three-dimensional heat conduction network in the material, and the heat conduction rate is increased; meanwhile, the Li-Al-Si vitrified precursor powder is induced to separate out low-thermal-expansion microcrystals in a third temperature stage, and the material is endowed with thermal shock resistance stability through a microstress compensation mechanism; the three additives have a synergistic effect to improve the heat storage performance and mechanical stability of the material.

The invention relates to a method for preparing a hard carbon material from a low-rank coal hot melt, the hard carbon material obtained by using the method, application of the hard carbon material and a sodium ion battery containing the hard carbon material. The method comprises the steps of raw material pretreatment, degradation solvent extraction, precipitation separation, spray granulation, crosslinking, primary carbonization, secondary carbonization, cooling and the like. According to the method, microcrystalline defects of the coal-based hard carbon material are regulated and controlled through self-foaming of the low-rank coal hot melt, effective regulation and control of the hard carbon microcrystalline structure are achieved, the ultrafine grinding process is omitted, meanwhile, in-situ oxygen element doping is achieved, and the surface activity of the material and the first efficiency of the negative electrode material are effectively improved. Through the method, the low-rank coal can be converted into the sodium battery hard carbon negative electrode material in a high-valued manner, the application scene of the low-rank coal is expanded, and the comprehensive utilization level of coal resources is improved.

The invention belongs to the technical field of energy storage materials, and particularly discloses preparation and application of a high-performance asphalt-based porous carbon material. The method comprises the following steps: pre-treating asphalt; carrying out hydrothermal synthesis on microcrystalline cellulose and phytic acid to obtain cellulose ester; the preparation method comprises the following steps: compounding humic acid, hectorite powder and cellulose ester, and freeze-drying to obtain a compound additive; carrying out microwave-hydrothermal reaction on the pretreated asphalt and a compound additive to form a precursor; and activating the precursor, carbonate and phosphate in a multi-section gradient atmosphere, and finally washing and drying to obtain the porous carbon material. According to the method, strong base etching is replaced by synergistic pore-forming and atmosphere activation of the composite additive, so that green controllable pore expansion and uniform doping of heteroatoms are realized; and a graded pore channel structure is accurately constructed through multi-section carbonization. The obtained material has a three-dimensional interpenetrating network, a high specific surface area and excellent conductivity, can effectively buffer ion embedding stress, remarkably improve electrochemical stability and inhibit volume expansion, and is suitable for lithium and sodium ion battery negative electrodes and supercapacitor electrodes.

The invention belongs to the technical field of photosensitive glass, and discloses colored photosensitive microcrystalline glass and a preparation method and application thereof.The preparation method of the colored photosensitive microcrystalline glass comprises the steps that SiO2, Al2O3, B2O3, Li2O, Na2O, MgO, ZnO, ZrO2, CeO2, Ag2O, Sb2O3, F <->, Cl <->, Br <-> and a clarifying agent are mixed to obtain a mixture, the mixture is sequentially melted, clarified and formed, formed glass is obtained, and the colored photosensitive microcrystalline glass is obtained. And carrying out heat treatment on the formed glass to obtain the colored photosensitive microcrystalline glass. According to the preparation method, a'photosensitizer-colorant-nucleating agent 'decoupling doping strategy is innovatively adopted through component gradient design and a multi-stage heat treatment system, so that color development, crystallization and transparency under different heat treatment systems are realized, and the colored photosensitive microcrystalline glass with a color development function and a photosensitive micro-crystallization characteristic can be prepared.

The present application relates to a kind of composite phosphorus-free scale inhibitor and its preparation method, including 800-1200 parts by weight of desalted water, 1-3 parts by weight of modified lignin sulfonate, 2-4 parts by weight of calcium magnesium acetate, 0.5-1.5 parts by weight of azole, 400-600 parts by weight of soluble inorganic zinc salt and 50-150 parts by weight of copolymer A.The composite phosphorus-free scale inhibitor provided by the present application is clear and transparent concentrate, after the above concentrate is added to circulating water, the effective ingredient in it can form soluble chelate with Ca 2+ , Mg 2+ Forming, increase the saturation solubility of ion, hinder micro-fouling lattice formation, distort crystal growth, so that microcrystalline will not accumulate into scale, and can make old scale loose, gradually shed old scale;At the same time, the special corrosion inhibitor and other corrosion inhibitor produce synergistic effect, which can effectively control the pitting of stainless steel, achieve the purpose of preventing scale, and fundamentally reduce the efficiency of corrosion and scale inhibition.