317 results about "Fine grain" patented technology

The invention belongs to the field of advanced metal plastic processing, and particularly relates to a difficult-to-deform metal ultra-thin strip rolling device and method.The device comprises an uncoiler, a high-strength rolling mill and a coiler which are sequentially arranged, and the inlet side and the outlet side of the high-strength rolling mill are each provided with a pair of equal-diameter rollers; the equal-diameter roller is composed of a copper conductive roller and a ceramic insulating roller, the copper conductive roller on the inlet side and the copper conductive roller on the outlet side are electrically connected to the positive electrode and the negative electrode of the pulse power source respectively, and a strip blank on the uncoiling machine sequentially penetrates through the equal-diameter roller on the inlet side, the high-strength rolling mill and the equal-diameter roller on the outlet side and then is wound on the coiling machine. And a working roll, which is in contact with the strip blank, on the high-strength rolling mill is an insulating ceramic working roll. The pulse current in the method can induce dynamic recrystallization, an ultra-fine grain or nanocrystalline structure is obtained, and the strength and plasticity matching of the product is superior to those of a traditional process. Meanwhile, long-time high-temperature oxidation can be avoided by adopting pulse current to heat the strip blank, and the surface is bright.

The invention discloses a pyrochlore structure high-entropy ceramic solidified body material as well as a preparation method and application thereof, and belongs to the technical field of nuclear waste solidification. The preparation method of the high-entropy ceramic solidified body material with the pyrochlore structure comprises the following steps: weighing raw material powder of La2O3, Nd2O3, Sm2O3, Gd2O3, Eu2O3 and ZrO2 according to the proportion in (La0. 2Nd0. 2Sm0. 2Gd0. 2Eu0. 2) 2Zr2O7; the weighed raw material powder is subjected to ball milling treatment, and ball-milled powder is obtained; under the inert gas atmosphere, the ball-milled powder is subjected to heat treatment, and heat-treated powder is obtained; and carrying out spark plasma sintering on the heat treatment powder to obtain the pyrochlore structure high-entropy ceramic solidified body material. The powder is treated by using a heat treatment technology, so that the powder is homogenized, a pyrochlore phase is formed, grain growth is more favorably inhibited, a fine grain structure is obtained, and the irradiation stability and the mechanical property of the pyrochlore material are improved.

The invention relates to the technical field of ore separation, and discloses a multi-stage photoelectric-jigging-magnetic separation synergistic efficient ore separation process which comprises the following steps: A, material pretreatment and particle size regulation and control: raw ore raw materials are treated through crushing and screening equipment; the method comprises the following steps of: adding the raw materials into a magnetic separator to obtain a coarse-fraction product with the particle size range of 5-100mm and a fine-fraction product with the particle size range of 0.5-5mm, and cleaning and drying the products to remove surface dust and pollutants. Sequential and parallel recognition and sorting of multi-dimensional physical attributes such as color (photoelectricity), density (jigging) and magnetism (magnetic separation) of ore particles are achieved, the function limitation of a single sorting method is overcome through the multi-technology coupling mechanism, and a large amount of waste rock is efficiently thrown at the front end through photoelectric pre-sorting; the enriched valuable minerals can be intensively treated by subsequent gravity separation and magnetic separation equipment, and the unit operation efficiency is improved.

The invention provides a cold machining manufacturing method of an ultra-fine grain seamless steel pipe. The method comprises the following steps: firstly, selecting a low-alloy structural steel billet with specific components, which comprises C, Si, Mn and microalloy elements of Nb, V and Ti, and heating, perforating and hot-rolling to prepare a pierced billet; and then multi-pass cold deformation treatment is carried out, 5-8 times of cold drawing or cold rolling is carried out on the pierced billet, the deformation of each pass is not lower than 30%, the cold drawing or cold rolling is carried out at the room temperature at the specific speed, and natural cooling is carried out between the passes. Recrystallization annealing is carried out after each pass of cold deformation, heat preservation is carried out for 1-2 hours at the temperature of 650-750 DEG C, and then controlled cooling is carried out. And finally, a finished product is obtained through straightening, head and tail cutting and nondestructive testing. According to the method, through cyclic cooperation of multi-pass cold deformation and recrystallization annealing and the effect of synergistically inhibiting grain growth of microalloy elements, the internal structure of the steel pipe is fully refined and homogenized, and then the comprehensive mechanical properties of the strength and toughness of the finished seamless steel pipe are remarkably improved; and meanwhile, the technological process is stable and controllable, and the product surface quality is excellent.

The invention relates to a preparation method of a high-hardness composite coating on a titanium alloy surface, which comprises the following steps: pretreating a titanium alloy base material to remove a surface oxide layer to obtain the treated titanium alloy base material; prepared high-entropy alloy powder is dried and evenly laid on the surface of the treated titanium alloy base material, and the titanium alloy base material with the powder laid is obtained; performing laser cladding treatment on the titanium alloy base material subjected to powder laying in a protective gas atmosphere to obtain a high-entropy alloy strengthened coating; the particle size of the powder is controlled to be 65-90 microns. The Al powder, the Co powder, the Ni powder, the Ti powder and the B powder with the purity higher than 99.5 wt% are selected as raw materials, the high-entropy alloy powder and the high-strength titanium alloy matrix are molten on the surface of the high-strength titanium alloy through a laser high-energy heat source, the metallurgical bonding effect is achieved, high-entropy phase strengthening is achieved, grains can be fine, and the hardness and abrasion resistance of a surface coating can be improved. The surface hardness of the coating prepared by laser cladding of the high-entropy alloy powder on the surface of the titanium alloy is not lower than 677 HV, and the wear resistance is not lower than 1.128 hmm.

The invention discloses high-strength heat-resistant aluminum-copper alloy powder, a 3D printing application method and an aluminum product. Relates to the technical field of metal material and additive manufacturing, in particular to a high-strength heat-resistant aluminum alloy material suitable for selective laser melting. The alloy powder is composed of Cu, Sc, Ni, Ce, Si, Mn, Ti, Fe and Al, the content of Cu ranges from 5 wt% to 15 wt%, the content of Sc ranges from 0.3 wt% to 2 wt%, the content of Ni ranges from 0.5 wt% to 5.5 wt%, the content of Ce ranges from 0.5 wt% to 5.5 wt%, and an Al7Cu4Ni eutectic phase is generated in situ in the printing process. And through a multi-element synergistic strengthening mechanism, the solidification interval is effectively reduced, cracks are inhibited, and meanwhile fine grain strengthening and precipitation strengthening are achieved. After SLM forming and low-temperature heat treatment, the obtained aluminum product has ultrahigh strength, good plasticity and excellent heat resistance, the tensile strength exceeds 650 MPa, the hardness exceeds 180 HV0.2, the ductility exceeds 7%, and the aluminum product meets the requirements for light high-strength heat-resistant components in the high-end fields such as aerospace and the like.

A flashbutt joint member having excellent processability of a joint portion and a welding method thereof are provided. The present disclosure relates to a joint member having excellent processability and a manufacturing method thereof, and in a joint member having a joint portion obtained by flashbutt welding a butt joint portion of a steel sheet using an electrode, an average hardness difference between a coarse grain heat-affected zone and a fine grain heat-affected zone formed on any one of left and right sides of the joint portion, based on a joint line (joint interface) is within 50 in Vickers hardness.

The invention discloses a method for preparing YAG transparent ceramic by two-step sintering, which comprises the following steps: 1) weighing yttrium oxide powder and aluminum oxide powder according to a stoichiometric ratio, mixing, and carrying out solid-phase reaction to synthesize YAG powder; 2) performing dry grinding and wet grinding on the obtained YAG powder to obtain mixed slurry; 3) drying the obtained mixed slurry to obtain powder, and performing compression molding and cold isostatic pressing to obtain a ceramic biscuit; and 4) pre-sintering the obtained ceramic biscuit in an oxygen-containing atmosphere, embedding the pre-sintered ceramic with oxide particles, and carrying out hot isostatic pressing sintering to prepare the YAG transparent ceramic. On the basis of obtaining the YAG transparent ceramic with high optical quality, a microstructure with a fine grain size can be obtained, and good mechanical properties are considered; the preparation method is simple, the equipment cost and energy consumption are low, the traditional annealing step can be omitted, and a new thought can be provided for preparation of the high-performance YAG transparent ceramic.

The invention discloses round steel for a phi 300mm large-specification petroleum valve body and a production method of the round steel. The round steel comprises the following chemical components in percentage by weight: 0.17%-0.20% of C, 0.20%-0.30% of Si, 1.23%-1.35% of Mn, 0.015%-0.030% of Al, 0.005%-0.015% of V and the balance of iron and inevitable impurities. On the basis of solution strengthening of C and Mn, V, Al and other fine-grain alloy elements are designed and added, dispersed precipitation of carbon and nitride fine particles and solution strengthening of the V and Al elements are achieved through controlled rolling to refine grains, the strength and toughness of the round steel are greatly improved, it is guaranteed that the grains are fine, and the normalized V-type-50 DEG C low-temperature impact of the round steel is larger than 100 J; and the grain size in the hot rolling state is 6.5-7.0 grade, and the requirements of downstream customers can be completely met.

The invention belongs to the technical field of metal materials, and discloses precipitation-hardening stainless steel and a preparation method thereof. Through cooperative regulation and control of component design and process innovation, the traditional contradiction of'strength-plasticity inversion 'in additive manufacturing of the precipitation-hardened stainless steel is broken through, and the precipitation-hardened stainless steel with excellent strength and plasticity is prepared. On one hand, the N element is introduced into the precipitation-hardening stainless steel raw material powder, so that transformation from ferrite to austenite in the additive manufacturing process is promoted; on the other hand, in the additive manufacturing process, the substrate is subjected to in-situ heating to be close to the martensite phase transformation initial temperature, and transformation of austenite to martensite is restrained; and after printing is finished, global martensite phase transformation is triggered through natural cooling or air cooling, so that a total martensite structure with fine grains and high dislocation density is obtained. And finally, through aging treatment, precipitation of a nano Cu phase is induced, formation of austenite is reversed, and therefore the strength and plasticity of the precipitation-hardened stainless steel are improved at the same time.

The invention belongs to the technical field of mechanical manufacturing and material science, and particularly relates to an artificial intelligence chip inductor powder mold surface strengthening treatment method and system, which comprises the steps of mold matrix mechanical shock strengthening pretreatment, preparation of a gradient diffusion layer, a toughness bonding layer and a superhard wear-resistant layer in sequence without breaking vacuum, and post-treatment. The system is integrated vacuum treatment equipment and realizes continuous treatment without breaking vacuum. Surface mechanical shock strengthening is introduced in the pretreatment stage of a mold base body, and a strengthening layer with a fine grain structure, high-density dislocation and remarkable residual compressive stress is formed on the surface layer of the mold. According to the strengthening layer, the fatigue strength and the plastic deformation resistance of the mold base body are effectively improved, a tough bearing substrate is provided for growth of the subsequent surface strengthening layer, and therefore the problem that the binding force between a traditional strengthening layer and a brittle base body is insufficient is fundamentally solved, and the fatigue fracture resistance of the whole mold structure is remarkably improved.

A process for manufacturing compact coils of ultra-fine grained martensite-free steel bars, the process comprising the following phases: a) rolling a billet by means of a roughing mill (1) of the steel bar; b) performing at least one first cooling stage (2) so that the steel bar has a surface temperature higher than the martensite start temperature (Ms) and at least one first equalization stage in air; c) rolling the steel bar by means of at least one intermediate mill (3); d) performing at least one second cooling stage (4) always keeping the surface temperature higher than the martensite start temperature (Ms) and at least one second equalization stage in air; e) rolling the steel bar by means of a finishing mill (5) in the non-recrystallization temperature range, keeping the entire cross section of the steel bar in said non-recrystallization temperature range and wherein the total reduction is between 25% and 50% with respect to the cross section of the steel bar at the inlet of the finishing mill, so as to obtain an ultra-fine grained austenitic matrix; f) winding the steel bar into compact coils by means of at least one winding device (7) so that the ultra-fine grained austenitic matrix transforms into a mixture of ferrite and pearlite. After the winding operation is completed, the compact coils can be conveyed to a storage area by means of a conveying device (8), for example a walking beam, in which the coils are subjected to natural cooling or forced cooling or delayed cooling.

The application discloses a recovery method for separating titanium from titanium-containing iron tailings, which comprises the following steps: slurry-making of the titanium-containing iron tailings to reach the concentration requirement of a first-stage high-intensity magnetic separation; first-stage high-intensity magnetic separation of the titanium-containing iron tailings, so that the magnetic material enters a grading grinding process; iron removal of the magnetic material after the grading grinding process to obtain iron concentrate; spiral chute gravity separation of the slurry after the iron removal, so that the gravity separation concentrate is used as titanium concentrate, and tailings enter a grading concentration process; the non-magnetic material after the first-stage high-intensity magnetic separation and the tailings after the gravity separation both enter the grading concentration process; coarse-grained material after the grading concentration enters a second-stage high-intensity magnetic separation, so that the concentrate is used as secondary titanium concentrate, and the tailings and fine-grained material after the grading concentration both enter a cloth chute gravity separation, so that the gravity separation concentrate is used as the secondary titanium concentrate, and the gravity separation tailings are discharged into a tailings pond or are dry discharged. The method increases the secondary titanium concentrate product, can improve the recovery rate by more than 15%, and improves the economic benefits.

The present application relates to the technical field of metal smelting, and particularly relates to a glass-sealed high-chromium ferrite stainless steel wire rod, which comprises the following components in percentage by mass: C: 0.030%, Cr: 27.20-27.80%, Ni: 1.10-1.50%, Cu: 0.20%, Nb: 0.10-0.20%, Mn: 0.40-0.70%, Si: 0.20-0.50%, P: 0.010-0.020%, S: 0.005%, N: 0.040%, and the balance of Fe and inevitable impurities. The present application also relates to a preparation method of the stainless steel wire rod, which comprises the following steps: sequentially subjecting raw materials to electric arc furnace smelting, AOD smelting, LF smelting, continuous casting, hot delivery rolling, and solid solution process treatment, and finally obtaining a stainless steel wire rod product. Through optimization of the stainless steel component design and production process conditions, the material has good surface quality, excellent plasticity and toughness, fine grain size, and reasonable thermal expansion coefficient, and the manufacturing process is simple, and batch production can be carried out.

The invention discloses a suspension graded and segmented calcining system, which relates to the technical field of ore decomposition and comprises a scattering box and a suspension furnace body, and a first-section calcining furnace, a second-section calcining furnace and a third-section calcining furnace are respectively and fixedly mounted at the bottom end of the suspension furnace body from left to right. By arranging the suspension furnace body, the first-section calcining furnace, the second-section calcining furnace and the third-section calcining furnace, when the system is used, particles are graded by utilizing flue gas, and when the settling velocity of a material with a certain critical particle size is smaller than the flow velocity of the flue gas, the material can be completely carried by the flue gas to ascend and move forwards along with the flue gas along the furnace body. The suspension furnace body is provided with a plurality of ascending sections and descending sections, and flue gas is utilized for grading. By means of the method, efficient graded calcination is directly carried out on the fine ore with the particle size smaller than 5 mm, and the problem that grinding pretreatment needs to be carried out on the fine ore with the particle size smaller than 5 mm in an existing suspension calcination process is solved.

The utility model belongs to the technical field of machining cutters, particularly relates to a high-cutting-force ultra-fine particle tungsten steel forming cutter, and aims to solve the problems that an existing device is of an integral structure, when a cutting edge of a cutter core is abraded or damaged in the using process, the whole cutter needs to be replaced, great waste is caused, and machining cost is increased. According to the scheme, the tool comprises a tool bar, a tool bit is arranged at one end of the tool bar, and a cutting edge is spirally installed on the surface of the tool bit in a surrounding mode; the tool has the advantages that the tool is of a detachable structure, when the cutting edge of the tool bit is abraded or damaged, only the tool bit needs to be replaced, the whole tool does not need to be replaced, machining cost is reduced, tool bit replacement operation is simple, the tool bit and the tool bar can be easily separated by unscrewing the limiting bolt and rotating and moving the rotating sleeve, the tool bit can be conveniently and rapidly replaced, and machining efficiency is improved. The downtime is reduced, the production efficiency is improved, cutting contact points are increased due to the fact that the cutting edges on the tool bit are distributed in a tooth shape, and the cutting efficiency is improved.

This invention relates to a high-power, low-loss Li-based microwave ferrite for LTCC and its preparation method, belonging to the field of electronic ceramics technology. The ferrite, based on its respective standard components, contains the following content: Li₂CO₃ 11.80–12.24 mol%, ZnO 19.87–20.41 mol%, TiO₂ 10.78–11.08 mol%, Mn₃O₄ 0.39–2.65 mol%, Co₃O₄ 0.04–0.58 mol%, Fe₂O₃ 54.70–56.18 mol%, and Bi₂O₃ 0.09 mol%. This invention introduces high-valence Mn ions into the Li-based microwave ferrite, altering the ferrite grain size distribution, particularly increasing the proportion of fine grains, thus improving the spin linewidth. Based on grain refinement, the introduction of an appropriate amount of Co ions with rapid relaxation characteristics further enhances the ferrite's spin linewidth.

The invention provides a flotation method for fine-fraction gold-loaded pyrite, and relates to the technical field of flotation separation. Specifically, an artificial microsphere material is subjected to grafting modification treatment, and then a collecting type microsphere material and an adjusting type microsphere material are obtained through surface modification treatment; preparing ore pulp containing fine-fraction gold-bearing pyrite, and carrying out flotation treatment through a flotation reagent and a flotation process to obtain gold-bearing concentrate; wherein the flotation reagent comprises a collecting agent, the collecting type microsphere material and the adjusting type microsphere material, and the flotation process comprises three times of roughing, one time of concentration and two times of scavenging. According to the method, efficient recovery of fine-fraction gold-loaded pyrite is taken as a target, flotation operation is performed by preparing two specific microsphere materials, and the gold recovery rate is larger than 80%; the method provided by the invention has the advantages of high efficiency, low energy consumption, easy bubble recovery, environmental protection and the like, and the whole process is simple.

The application discloses a high-strength ceramic metallization method, and innovatively obtains a ceramic grain growth agent, which comprises 75wt%-85wt% metal oxide powder A, 5wt%-10wt% binder A and 5wt%-20wt% solvent A. The ceramic grain growth agent is coated on the position of an alumina ceramic substrate which needs to be metallized, and after sintering, a fine grain and coarse grain double-layer structure is formed on the ceramic substrate. The fine grains in the inner layer can improve the strength of the ceramic substrate, and the coarse grains in the surface layer can improve the penetration pressure of the glass phase in the ceramic substrate during subsequent metallization sintering, promote the penetration of the glass phase in the ceramic substrate into the metallization ink layer, improve the bonding strength of the metallization ink layer and the ceramic substrate, and thus ensure the sealing strength of the ceramic substrate and the metal piece.

The utility model discloses a shovel brush separation type I-shaped steel joint cleaning device driven by a rotary digging drill, which comprises a wall brushing device main body, a wall brushing structure and a wall shoveling structure, the wall brushing structure and the wall shoveling structure are respectively and correspondingly welded on two sides of the wall brushing device main body, and the wall brushing device main body is made of a drill bit of the rotary digging drill or a hole drill. The wall shoveling structure comprises a wall shoveling connecting base, a lower wall shoveling plate and an upper wall shoveling plate, the lower wall shoveling plate and the upper wall shoveling plate are fixedly connected with the wall brushing device body through the wall shoveling connecting base, and the lower wall shoveling plate and the upper wall shoveling plate are arranged in parallel in an up-down structure. According to the shovel-brush separation type I-shaped steel joint cleaning device driven by the rotary drilling rig, the design that a shovel wall structure and a brush wall structure are separated is adopted, hard objects can be effectively shoveled firstly, then fine-grain impurities are brushed away, cleaning of an I-shaped steel joint is more thorough, the cleanliness of the joint part in underground diaphragm wall construction is guaranteed, and the construction quality is improved.

The invention discloses a preparation method of a coarse / fine grain double-structure texture graphene-magnesium-based composite material, and belongs to the field of metal material preparation. According to the method, graphene forms an enrichment area and a lean area in a magnesium matrix through a powder mixing process, and then cold pressing, sintering and hot extrusion forming are performed to prepare the composite material with a coarse grain and fine grain double-structure tissue. According to the method, the problem that plasticity of a traditional graphene-magnesium-based composite material is reduced due to the fact that grains are too refined is solved, the material strength is remarkably improved, and meanwhile the ductility and toughness of the material are effectively improved. The preparation method is simple in process, low in cost and suitable for preparation of light high-strength structural materials such as low-altitude aircrafts and new energy automobiles, and has wide application prospects.

This invention relates to the field of engineering foundation construction, specifically disclosing a method for removing fine particles from dredged sandy soil foundations. The method includes a pipeline, an upper rod, a suction pipe, and a cone. The upper rod contains a high-pressure water pipe, a high-pressure air pipe, and a suction pipe, all connected to the pipeline. The suction pipe, from the outside in, consists of an outer shell, a filter screen, and a suction chamber. The outer shell has several suction holes and several high-pressure air jet holes, connected to the high-pressure air pipe, and the suction chamber is connected to the suction pipe. The cone's tip has a high-pressure water jet hole connected to the high-pressure water pipe. Several vibrating rods are fixedly installed within the upper rod and suction pipe. This invention's fine particle removal equipment penetrates deep into the soil layer and removes fine particles through suction and filtration. It has a simple structure, is easy to implement, has low construction costs, and is convenient to operate. It can effectively remove fine particles from dredged sandy soil foundations, greatly reducing the difficulty of dredged sandy soil foundation treatment construction.

A suction nozzle is communicated with a suction device, even a filter is connected between the suction device and the suction nozzle in series, a suction opening of the suction nozzle faces downwards to the edge of a conveying belt, and the suction nozzle is suitable for sucking and removing the paving offcut on the edge of the conveying belt. Compared with the prior art, fine particle wood shavings can be fully sucked away, the removal rate of the paving offcut is increased, the suction nozzle can be separated from the conveying belt, abrasion of the suction nozzle and the paving offcut to the conveying belt is reduced, and the service life of the conveying belt is prolonged.

The application discloses a toughened molybdenum nitride-based protective coating and a preparation method and application thereof, and belongs to the technical field of protective coatings. The toughened molybdenum nitride-based protective coating comprises a MoXN layer; according to atomic percentage, the MoXN layer comprises 60% to 75% of Mo and 7% to 15% of X, and the balance is N; wherein X comprises at least one element in Ti, Zr, V and Nb; the MoXN layer has a B1 face-centered cubic phase structure; and the MoXN layer has a nanocrystalline structure, and the nanocrystalline structure has lattice distortion and dislocations. The MoXN layer has the synergistic hardening effect of fine grain, lattice distortion and dislocation, and the dislocation can provide plastic deformation capacity and increase the toughness of the coating, so that the toughened molybdenum nitride-based protective coating has the super-high hardness of a ceramic phase and the good toughness of a metal, and has a good protective effect.

The utility model relates to engineering detection technical field, discloses a kind of quick detection device of dry density specifically, to solve the problems such as traditional detection method operation cumbersome, low efficiency, existing radiation risk. Device core includes standard container, weighing sensor, signal conditioning circuit, single-chip microcontroller, hardware proportioning calculator, stable judging module, display screen and ventilation / heating module. Through RFID, container volume V is automatically read, weighing sensor measures soil sample mass m, proportioning calculator calculates dry density ρ=m / V in real time, and the result is output through display screen;Ventilation / heating module accelerates moisture evaporation, shortens detection time. The device has the advantages of real-time display, simple operation, avoids artificial error, no radiation risk, and is suitable for fine-grained soil, coarse-grained soil and frozen soil detection dry density requirements, etc., and is suitable for water conservancy engineering, such as earth dam filling and embankment engineering, building engineering and other fields of soil compaction quality rapid detection.

The application discloses a high-strength softening-resistant copper-tantalum composite material with a bimodal grain structure and a preparation method thereof, and the method comprises the following steps: firstly, according to the design composition of the target product copper-tantalum composite material, different sizes of copper powder and tantalum powder are mixed and high-energy ball-milled to obtain a multi-element structure copper / tantalum composite powder; secondly, the multi-element structure copper / tantalum composite powder is pre-densified and sintered to obtain a composite blank; and thirdly, the composite blank is rolled or / and extruded to obtain the copper-tantalum composite material. Based on the composite configuration design of the bimodal grain structure, the coarse-fine grain regions are used to form a non-local strain gradient induced back stress strengthening effect, local stress concentration and strain mismatch are relieved, the strength and plasticity of the copper-tantalum composite material are simultaneously improved, and the alloying method is used to introduce a double-scale nano tantalum phase, so that the high-temperature softening resistance of the composite material is improved, and the composite material is suitable for the fields of electronic packaging, heat sinks and electric contact materials.

The present invention provides a laminate capable of sufficiently suppressing foreign matter when a substrate is peeled off. This laminate includes a substrate and a resin composition layer formed on the substrate. The resin composition layer contains inorganic particles, an epoxy resin, and a silane coupling agent, and has a thickness of 0.10 mm to 1.00 mm. The percentage of the inorganic particles with respect to the solid content of the resin composition layer is 50 mass% to 99 mass%. The cumulative 50% particle diameter D50 of the inorganic particles is 10 μm or less from the fine grain side of a cumulative particle size distribution based on volume. The silane couple agent is such that the polarity term of the Hansen solubility parameter is 2 to 10.

The present application belongs to the technical field of metal materials, and discloses a precipitation hardening stainless steel and a preparation method thereof. Through synergistic regulation of component design and process innovation, the present application breaks through the traditional contradiction of "strength-plasticity inversion" in additive manufacturing of precipitation hardening stainless steel, and prepares a precipitation hardening stainless steel with excellent strength and plasticity. On the one hand, by introducing N element in the raw material powder of the precipitation hardening stainless steel, the transformation of ferrite to austenite in the additive manufacturing process is promoted; on the other hand, the substrate is heated in situ to the vicinity of the martensite transformation starting temperature in the additive manufacturing process, and the transformation of austenite to martensite is inhibited; and after the printing is completed, global martensite transformation is triggered by natural cooling or air cooling, so that the full martensite structure with fine grains and high dislocation density is obtained. Finally, through aging treatment, the precipitation of nano Cu phase is induced, and the formation of austenite is reversed, so that the strength and plasticity of the precipitation hardening stainless steel are simultaneously improved.

The invention discloses a partition standing wave ultrasonic flotation method based on raw coal feeding granularity, and belongs to the technical field of mineral processing engineering. According to the method, coal slime is screened firstly, coarse-grain-dominated coal slime and medium-fine-grain-dominated coal slime are divided according to the size fraction proportion, a pair of double-ultrasonic vibrators is symmetrically arranged on the side wall of a stirring area and the side wall of a separation area of a flotation tank respectively, a stable standing wave sound field is constructed, only stirring area ultrasound is started for the medium-fine-grain-dominated coal slime, two-area ultrasound is alternately started for the coarse-grain-dominated coal slime, and the two-area ultrasound is started for the medium-fine-grain-dominated coal slime; and completing flotation separation by matching ultrasonic parameters, ore pulp concentration, ultrasonic activation and segmented dosing. The separation effect of coal slime with different granularities is enhanced, the clean coal yield and quality are effectively improved, and agent consumption is reduced.

The application discloses a method for preparing porous zeolite composite materials from iron tailings and application, and converts fine-grained iron tailings with complex composition and low reaction activity into soluble salt through alkali fusion activation, and then converts the soluble salt into zeolite composite materials with uniform particle size and rich pores through hydrothermal crystallization. The application does not perform raw material pretreatment steps such as grinding and impurity removal, does not introduce a structure directing agent, controls the crystal structure of the iron tailings through alkali fusion activation-hydrothermal crystallization reaction, makes [SiO4] and [AlO6] structure units dissolve and recombine, simultaneously realizes in-situ doping and surface loading of iron elements, and constructs micrometer-level octahedral porous zeolite composite materials. The prepared porous zeolite composite materials have a large specific surface area, uniform pore size distribution and complete crystal structure, and exhibit excellent catalytic oxidation performance in a Fenton-like system, can efficiently remove emerging pollutants such as antibiotics, and are helpful to efficient and high-value utilization of fine-grained iron tailings resources, and have a wide application prospect in the field of wastewater treatment.