82results about How to "Reduce microcracks" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention discloses a high-performance special ceramic material and a preparation process thereof, and the preparation process comprises the following steps: proportioning tungsten carbide, ternary boride, titanium nitride, molybdenum, nickel, silicon, cobalt and other raw materials with nano silicon carbide whiskers according to a ratio, carrying out ball milling treatment, adding a forming agent, and continuing ball milling and granulation; and then, carrying out compression molding on the ceramic powder, carrying out liquid phase sintering in a CO atmosphere, and cooling to room temperature to obtain the high-performance special ceramic material. The Mo3NiB3 ternary boride is introduced, so that the hardness and impact resistance of the ceramic material can be improved, the interface bonding force between a ceramic matrix and a reinforcing phase is enhanced, and the bending strength is improved; the nano silicon carbide whiskers are subjected to nickel plating treatment, so that the interface bonding force can be improved, microcracks are reduced, and the strength and toughness of the ceramic material are enhanced; by optimizing the sintering process and adopting a staged heating mode, grain growth can be controlled, and the density and mechanical properties of the ceramic material are effectively improved.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention discloses a molded surface pre-dispersion superplastic forming / diffusion bonding method, and belongs to the field of superplastic forming. The method solves the problem that when an ultrathin hollow multilayer structure is formed through an existing superplastic forming / diffusion bonding method, the wall thickness is not uniform due to excessive deformation of a core plate. According to the method, the core plate is subjected to large plastic deformation through a pre-reverse expansion method, stress concentration in a material is released, then the protruding part is subjected to plastic deformation through forward expansion, the core plate is subjected to plastic deformation in the reverse expansion stage, stress is more evenly distributed in the forward expansion stage, and therefore the situation that in a local area, the stress concentration in the material is reduced is avoided. And particularly, the phenomena of excessive deformation and thinning of high-strain parts such as fillets and the like are avoided, so that the uniformity of the wall thickness is greatly improved. The method provided by the invention comprises the following steps: (1) pre-forming a core plate and welding isolation ribs; (2) panel forming; (3) combining the core plate and the panel; (4) carrying out reverse expansion on the core plate; and (5) superplastic forming of the core plate.

The invention relates to an aluminum nitride ceramic heating plate and a preparation method and application thereof, and the preparation method comprises the following steps: mixing aluminum nitride powder and an auxiliary agent, and sequentially carrying out molding, hot pressed sintering and densification to obtain the aluminum nitride ceramic heating plate. The aluminum nitride powder is used as the raw material, the production steps are reduced, the production cost and the production difficulty are reduced, and the powder is used as the raw material, so that the uniformity of the aluminum nitride ceramic is improved, and the generation of microcracks in the ceramic is reduced. By adding the auxiliary agent, the uniformity and thermal conductivity of the aluminum nitride ceramic heating plate can be effectively regulated and controlled. The powder is used as a raw material, an aluminum nitride rough blank is prepared through hot pressed sintering, and the density of the aluminum nitride ceramic is further improved through densification. The prepared aluminum nitride ceramic heating plate is uniform in microstructure, free of layering, high in density, high in strength, uniform in heat conduction and not prone to cracking in the using process.

The invention relates to the technical field of precision casting of turbine blades, in particular to a ceramic core for a nickel-based superalloy isometric crystal hollow turbine blade and a preparation method of the ceramic core. The ceramic core is prepared by mixing refractory powder and a paraffin-based plasticizer and then sintering the mixture at a high temperature, and the mass ratio of the refractory powder to the paraffin-based plasticizer is (75-85): (15-25); the refractory powder is composed of quartz glass powder, alumina powder and natural crystalline flake graphite, and the mass ratio of the quartz glass powder to the alumina powder to the natural crystalline flake graphite is (72-77): (20-25): (0.5-3); the paraffin-based plasticizer is prepared from refined paraffin, beewax and low-density polyethylene, and the mass ratio of the refined paraffin to the beewax to the low-density polyethylene is (40-50): (40-50): (5-10). The natural flake graphite is creatively added into the raw materials of the ceramic core, so that the flowability of slurry is improved, the high-temperature bending strength of the ceramic core is improved, and the depoling performance of the mold core is improved.

The invention relates to a method for preparing artistic concrete by taking broken glass as a main raw material, which comprises the following steps of: a) treating the broken glass: cleaning recycled waste glass, and removing non-glass impurities by adopting a mechanical screening and water washing combined method; b) burdening and mixing: mixing the crushed glass slag with cement and fine sand according to a mass ratio; c) mixing and forming: putting all the materials into a concrete mixer with a speed-adjustable function, and fully stirring until the materials are uniform; then pouring the mixed concrete slurry into a pre-designed mold; and d) curing and demolding: primarily curing the poured concrete in a mold. The recycled waste glass is reasonably treated and proportioned, so that the physical and chemical properties of the concrete are enhanced, and a concrete product is more durable and stable when being used outdoors.

The invention discloses a positive electrode material and a preparation method thereof, a battery and an electric device. The preparation method of the positive electrode material comprises the following steps: preparing a metal salt solution and an organic ligand solution; mixing the metal salt solution and the organic ligand solution to form a turbid liquid; carrying out solid-liquid separation on the turbid liquid to separate out a precursor; the precursor is dried to obtain a precursor, and the precursor comprises a metal organic framework compound; and calcining the precursor, mixing with a lithium salt, and sintering to obtain the positive electrode material. According to the preparation method of the positive electrode material provided by the embodiment of the invention, the formed precursor comprising the metal organic framework compound (MOFs) is moderate in spherical particle size, less prone to large-area agglomeration in the calcining process and relatively good in dispersity, so that the calcined precursor can be more fully and uniformly mixed with a lithium salt, and the lithium ion battery performance is improved. The performance of the prepared positive electrode material is better; and moreover, intragranular microcracks can be reduced, so that the cycle performance of the battery is better.

The invention belongs to the technical field of metal material science, and particularly relates to a heterostructure plasticized magnesium-based composite material, a preparation method and application. A preparation method of a heterostructure plasticized magnesium-based composite material comprises the following steps that S1, AZ61 magnesium alloy powder, pure titanium carbide and stearic acid are mixed and subjected to low-speed and high-speed ball milling, mixed powder is obtained, and powder loading and cold pressing are conducted after the powder is cooled; and S2, the powder obtained after cold pressing in the S1 is subjected to a gradient heating exhaust vacuum hot pressing process, cooling is conducted, thermal deformation is conducted, and the heterostructure plasticized magnesium-based composite material is obtained. The plasticity of the prepared magnesium-based composite material is obviously improved, and the application potential of the magnesium-based composite material in the industrial field is expanded.

The invention belongs to the technical field of battery materials, and particularly relates to a sodium ion battery positive electrode material and a preparation method and application thereof. The preparation method of the sodium ion battery positive electrode material provided by the invention comprises the following steps: 1) mixing a sodium source, a precursor and a hexavalent tellurium source, and carrying out first calcination to obtain a first calcined material; and 2) mixing the first calcined material obtained in the step 1), a metal selenium compound and an organic solvent, and performing second calcination to obtain the sodium-ion battery positive electrode material. The structure and interface stability of the material are effectively enhanced through a three-in-one modification strategy of doping the high-valence element Te6 + coating the metal selenium compound and adjusting the microstructure, and the obtained sodium ion battery positive electrode material is stable in structure, stable in interface and good in redox reversibility and has good rate capability and cycle performance.

The present invention relates to the technical field of cement-based materials, and in particular to a preparation method and application of a highly homogeneous cement mortar material. The method comprises the following steps: (1) mixing nano hydrotalcite powder with anhydrous ethanol containing EGTA after calcination, and separating the solid product as modified nano hydrotalcite powder; (2) adding fly ash microbeads to anhydrous ethanol containing a silane coupling agent, stirring and dispersing, adding the modified nano hydrotalcite powder, and heating and heat preservation under stirring conditions; the separated solid product is dried to obtain modified fly ash microbeads; (3) uniformly mixing silicate cement, modified fly ash microbeads, surface-treated slag fine aggregate, surfactant, water reducer, and water to obtain the highly homogeneous cement mortar material. The above method not only effectively improves the compatibility between fly ash microbeads and cement mortar to obtain highly homogeneous cement mortar, but also overcomes the adverse effects on the mechanical properties of the mortar.

The invention provides a preparation method of a composite solid electrolyte coated positive electrode material. According to the invention, the silicon coupling agent is coated on the solid electrolyte, and a reticular retaining layer containing organic silicon is formed on the surface of the solid electrolyte, so that the stability of a material interface is effectively stabilized, the electrolyte is prevented from corroding an electrode material, and the rate capability and the cycling stability of a lithium-rich material are greatly improved. Then a cationic polymer is selected as a base membrane to be assembled into two layers of hybrid membranes to coat the outermost layer of the solid electrolyte, and then the crown ether lithium salt complex is introduced into the surface of the phospholipid / cationic polymer hybrid membrane, so that the occurrence of side reactions on the surface of an electrode is effectively inhibited, the structure of an active material is stabilized, and meanwhile, the thermal stability of the membrane is improved; and finally, the surface of the positive electrode material is coated with the composite solid electrolyte.

The invention relates to the technical field of inorganic non-metallic materials, in particular to aragonite fibers, a preparation method of the aragonite fibers, a cement-based material and a cement workpiece. The preparation method comprises the following steps: preparing raw materials including calcium ions, urease and urea into a mixed solution, and carrying out precipitation reaction to obtain aragonite fibers; wherein the mixed solution further comprises at least one of amylose, magnesium ions and sulfate ions, and the temperature of the mixed solution is lower than or equal to 50 DEG C. The catalyst promotes urea hydrolysis to generate carbonate ions, and then the carbonate ions and calcium ions generate calcium carbonate precipitates. On one hand, amylose, magnesium ions and sulfate ions can induce calcium ions and carbonate ions to generate aragonite crystals and inhibit generation of other allotropic variants; on the other hand, aragonite crystals can be induced to precipitate in a microfiber form, generation of rodlike fibers is promoted, and generation of particles in other micromorphologies is inhibited. The prepared aragonite fiber has a good microfiber form, is not easy to agglomerate, and can be used for reinforcing a cement-based material.

This utility model discloses a fixture for processing a nozzle green blank, including a fixed base; an arc-shaped sliding base that can slide along the arc-shaped fixed base in a first direction under the drive of a first driving component, the arc-shaped sliding base including a first plane abutting against the lower end face of the arc-shaped nozzle green blank. Two arc-shaped clamping bases are provided and respectively connected to corresponding second driving components. The arc-shaped clamping bases can slide along a second direction under the drive of the corresponding second driving components and can move synchronously with each arc-shaped sliding base. Each arc-shaped clamping base includes an arc surface located above the first plane of the arc surface and abutting against the side wall of the arc-shaped nozzle green blank. The arc surface and the first plane of the arc surface form a clamping cavity for clamping the arc-shaped nozzle green blank. The fixture satisfies the clamping force while reducing damage to the nozzle green blank and facilitating concentricity adjustment.

The utility model relates to an arc-angle drill bit, which comprises a supporting seat, an arc-angle drill bit and an arc-angle drill bit, the multiple arc angle drill bits are arranged on the circumference and are all fixed to the supporting base, and cutting edge parts of the arc angle drill bits are arranged to be in a wave shape; and the multiple discharging holes are formed in the end face of the supporting base. According to the drill bit, the arc-angle drill bit is arranged, and the arc cutting edge of the arc-angle drill bit can disperse cutting stress and reduce the risk of edge tip cracking during drilling, so that the service life of the drill bit can be prolonged, the number of times of drill bit replacement can be reduced, burrs and microcracks on the edge of a drilled hole can be reduced, and the hole wall roughness can be reduced. The supporting seat and the arc-angle drill bit are made of steel, so that the impact resistance is high during drilling, tipping is not easy to occur under intermittent cutting, the price is lower than that of a sintered drill bit, and the practicability is improved.

The utility model discloses a printing carrier plate and a photovoltaic cell, and belongs to the technical field of photovoltaic cells. The printing support plate comprises a support plate body and a film layer arranged on the surface of at least one side of the support plate body, and the film layer comprises at least one of a metal film layer and a polymer film layer; the printing carrier plate further comprises a groove array, and the groove array penetrates through the film layer and extends to the carrier plate body in the thickness direction of the printing carrier plate. According to the utility model, the quality of groove laser etching can be improved.

The utility model relates to the technical field of glass bending, and provides a glass bending assembly which comprises a deformation bending mechanism used for bending glass and changing the shape and a driving mechanism connected with the deformation bending mechanism. When the glass is bent, the driving mechanism drives the deformation bending mechanism to move towards the bending direction of the glass; and after the glass is bent, the driving mechanism drives the deformation bending mechanism to reset. The deformation bending mechanism can adjust the self structure in real time according to the actual bending form of the glass, and the problem of stress concentration caused by the fact that a traditional rigid bending mechanism cannot adapt to glass deformation is effectively solved. The dynamic adaptive mechanism obviously improves the bending precision, is particularly suitable for forming processing of bending the glass at 90 degrees, and meanwhile, reduces the risk that the glass cracks or is damaged in the bending process.

The present application relates to the technical field of silicone rubber material, in particular to a sericite modified silicone rubber material and a preparation method thereof.The present application overcomes the problems of poor dispersion of sericite in the organic silicon matrix and poor compatibility of fluorosilicon and common silicon.The silicone rubber material is prepared from polysiloxane hybrid base glue prepared by in-situ polymerization of fluorine-containing / ethenyl double modified sericite, fluorosilicon raw rubber, methylphenylvinyl silicone rubber, MQ silicone resin, hydrogen-containing silicone oil and vulcanizing agent;the preparation process involves double functional group grafting on the surface of sericite, monomer in-situ ring-opening polymerization coating, multiphase blending to build interpenetrating network and hydrogen-containing silicone oil chain extension to cooperate with gradient vulcanization, through building a rigid-flexible stereo enhanced network, the material is endowed with excellent oil resistance, heat resistance and high mechanical strength, and can be used in the field of automobile manufacturing.

The application discloses in-situ growth coated catalytic proppant and a preparation method and application thereof, and the preparation method of the proppant comprises the following steps: dispersing a proppant matrix in a salt solution containing one or more transition metal precursors to form a solid-liquid suspension system; adding a precipitator to the suspension system to induce in-situ heterogeneous nucleation and growth of the metal precursors on the surface of the proppant matrix, thereby forming a precursor-coated proppant with a core-shell structure; and performing high-temperature calcination on the precursor-coated proppant to obtain the in-situ growth coated catalytic proppant. The application utilizes in-situ growth and high-temperature reactivity sintering technology to construct a firm high-entropy ceramic catalytic film on the surface of the proppant, thereby solving the problems that a traditional impregnated proppant coating is easy to fall off and has poor temperature resistance; meanwhile, the high-entropy effect and lattice oxygen vacancies are utilized to achieve a technical breakthrough that the proppant can efficiently catalyze thick oil viscosity reduction without an organic modifier.

The invention relates to the technical field of solar photovoltaics, in particular to a monocrystalline silicon multi-section rod adhesive as well as a preparation method and application thereof. The monocrystalline silicon multi-section rod adhesive provided by the invention is prepared from the following components in parts by weight: 100 parts of a curing agent, 20 to 30 parts of an alkaline activator, 0.5 to 2 parts of nano filler, 2 to 4.5 parts of a retarder, 3 to 6 parts of a water reducing agent and 5 to 10 parts of water, wherein the curing agent comprises an amorphous silicon-aluminum compound. The monocrystalline silicon multi-section rod adhesive disclosed by the invention can be used for effectively adhering monocrystalline silicon base materials together, the hardness of the adhesive after curing is close to that of silicon, and the adhesive has excellent temperature resistance; when the monocrystalline silicon multi-section rod adhesive is used for cutting a monocrystalline silicon multi-section rod obtained by splicing monocrystalline silicon base materials, the manual dependence degree can be reduced, the cutting efficiency is improved, the utilization rate of raw materials is greatly improved, and the quality of a silicon wafer obtained by cutting is improved.

The invention provides an ultrafast laser drilling device and a using method thereof, the ultrafast laser drilling device is used for drilling on a part, and the ultrafast laser drilling device comprises a base, a supporting ring, a sliding window, a telescopic cover, vacuumizing equipment, an ultrafast laser machining head and a machine tool; the base is provided with a clamp used for clamping parts. The supporting ring is arranged in the horizontal direction and provided with a mounting hole. The sliding window is connected to the supporting ring in a sliding manner, can move in the mounting hole and is provided with a window mirror through which the ultrafast laser can penetrate; the telescopic cover is connected with the base and the sliding window, a closed cavity is defined by the telescopic cover, the base and the sliding window, and the parts are located in the closed cavity; the vacuumizing equipment is communicated with the closed cavity and is used for vacuumizing the closed cavity; the ultrafast laser processing head is used for generating an ultrafast laser beam which is vertically emitted into the window mirror; the machine tool is connected to the base and used for driving the base to move to a preset position. The quality and efficiency of ultrafast laser drilling can be improved, the structure is simple, and the universality is high.

The utility model relates to a high-precision horizontal swing spraying device which comprises spraying assemblies arranged in a machine frame in a vertically symmetrical mode, the spraying assemblies do reciprocating motion in the machine frame in the transverse direction, a spraying area is arranged between the two spraying assemblies, a plurality of spraying heads facing the spraying area are obliquely arranged on the spraying assemblies, and the spraying assemblies are arranged on the machine frame. And the spray head is used for spraying liquid to the spraying area. According to the high-precision horizontal swing spraying device, through the combination of the reciprocating spraying assembly and the inclined spraying head, dynamic covering is achieved, the problem of liquid accumulation or a blind area caused by a fixed spraying head path is avoided, liquid can cover the surface of a material more uniformly, the spraying precision and efficiency are improved, local defects are effectively reduced, and the spraying quality is improved. The influence on the surface treatment precision due to non-uniform liquid flow distribution is avoided.

The invention discloses a dry-type reactor encapsulation insulation epoxy resin system and a preparation method thereof. The dry-type reactor encapsulation insulation epoxy resin system comprises the following components in parts by weight: 40-90 parts of electronic-grade epoxy resin, 20-90 parts of bisphenol F epoxy resin, 5-20 parts of oxazolidinone epoxy resin and 2-5 parts of a curing agent. The dry type reactor encapsulation insulation epoxy resin system provided by the invention can improve the humidity and heat resistance and toughness of the current epoxy resin insulation material, reduce the microcrack and water absorption of the epoxy resin insulation material, improve the insulation capability of the insulation material, and improve the impact resistance, short circuit resistance and insulation performance of the reactor.

The invention relates to the technical field of dispersing agents, in particular to a silicon powder dispersing agent based on natural phenolic compound modification and a preparation method of the silicon powder dispersing agent. According to the dispersing agent, the problems that a large amount of chippings and silicon powder are generated in the cutting process by diamond wire cutting liquid, dispersion is insufficient, the chippings and the silicon powder are prone to being attached to the surface of diamond wires or crystalline silicon, then the chippings and the silicon powder are bonded together, and the cutting precision is reduced are solved, and the prepared silicon powder dispersing agent and the composite dispersing composition are good in dispersing effect and high in dispersing speed; the stability is good.

The present invention specifically relates to an environmentally friendly low-tin tin-plated plate and a manufacturing method thereof, and belongs to the technical field of alloy materials. The low-tin tin-plated plate comprises a substrate, a Fe-Sn alloy layer, a pure tin layer, a passivation film and an oil film in sequence. The tin content of the Fe-Sn alloy layer is 0.4 to 0.6 g / m 2 The alloy layer is uniform and dense, the grains are columnar, and the sum of the orientation degrees of FeSn2 (211) and FeSn2 (213) in the alloy layer is 2.5~3.0; the tin content of the pure tin layer is 0.5~0.7g / m 2 , the sum of the crystal orientation degrees of Sn(101) and Sn(200) is 2.2~2.5. The manufacturing method is based on an environmentally friendly methanesulfonic acid (MSA) electroplating tinning process and a low chromium content passivation process flow to solve the problem that low-tin tin-plated plates have poor corrosion resistance and are prone to pitting. The present invention designs the substrate composition and combines the process design of the key processes of "annealing, leveling, pickling, pre-wetting, electroplating, fluxing, soft melting, passivation, and oiling" to manufacture low-tin tin-plated plates with excellent corrosion resistance.

The application discloses a kind of design and manufacture method of printed circuit board inner layer circuit, the design and manufacture method includes: determining drilling parameter, and the basic size of connection PAD is set based on drilling parameter;Tear drop-shaped gradual widening structure is generated in the transition area of connection PAD and inner layer circuit, the structure of heat dissipation PAD is designed synchronously, and inner layer circuit wiring design is completed;Form inner layer circuit film, and check film;At the same time, pre-treatment is carried out to PCB inner layer substrate;The pattern is formed by aligning the film that passes the check with inner layer substrate;Substrate is etched;The substrate after etching is cleaned, and unqualified product is identified and screened, and the qualified product is inner layer circuit product.The application solves the problem of weak connection and easy breakage of PTH hole and inner layer circuit in high-density PCB through the three-in-one technical route of structure optimization+process synergy+precision control, and improves the mechanical strength, electrical reliability and thermal management capability of the product.

The invention provides low-alkalinity casting powder for peritectic alloy steel and a preparation method of the low-alkalinity casting powder, and belongs to the technical field of steelmaking metallurgy auxiliary materials. The invention relates to low-alkalinity casting powder for peritectic alloy steel. The low-alkalinity casting powder is prepared from the following raw materials in parts by weight: 5-8 parts of fluorite, 0-5 parts of wollastonite, 0-3 parts of sodium carbonate, 31-39 parts of manganese slag, 1-11 parts of limestone, 4.5-14 parts of glass powder, 2-5.5 parts of calcined aluminum ash, 4-8 parts of magnesium powder, 10-16 parts of manganese dioxide powder, 3-8 parts of zirconium oxide powder, 6-11 parts of a carbonaceous material and 2-3 parts of a binder. According to the peritectic alloy steel continuous casting covering slag, the casting blank quality of peritectic alloy steel is further improved, and the occurrence probability of microcracks is reduced.

This utility model relates to the technical field of printed circuit board processing equipment, and discloses a fixture and auxiliary tooling for avoiding jamming of thin plates. It includes a plate body with clamping edges for holding the thin plate; a plurality of first clamping pieces spaced apart from the clamping edges; and a plurality of second clamping pieces corresponding to the first clamping pieces, each second clamping piece being positioned at a first preset distance from one side of the first clamping piece. The length of the second clamping piece is greater than that of the first clamping piece. The second clamping pieces are used to bend and engage with a worktable to clamp the thin plate between the first clamping pieces and the second clamping pieces. This design solves the problem of deformation, jamming, and even breakage of thin plate parts during clamping and transportation.

The application discloses a preparation process of BR micropowder for the semiconductor industry, adopts liquid nitrogen low-temperature crushing to reduce micro-powder cracks and agglomeration, carries out gravity sedimentation-gradient magnetic separation grading, cooperates with dilute nitric acid-hydrofluoric acid mixed acid liquid deep impurity removal, and then carries out vacuum high-temperature reduction treatment and argon plasma activation, and sequentially deposits SiN x The transition layer and the diamond film form a composite film, and finally, the BR micropowder product is obtained through vacuum annealing and airflow grading. The BR micropowder prepared by the application has high purity, low total amount of metal impurities, small particle size distribution deviation, significantly reduced surface roughness, uniform particle strength, can effectively reduce chip processing scratch, edge collapse and metal pollution risk, and meets the high-precision and high-cleanliness requirements of high-end semiconductor cutting, grinding and polishing.