44 results about "Spherical pore" patented technology

The invention relates to a preparation method of an inorganic hollow fiber membrane and the inorganic hollow fiber membrane, and the preparation method comprises the following steps: a membrane casting solution preparation process: mixing inorganic powder, an additive, a pore-forming agent and a solvent to prepare a membrane casting solution, 100 parts by mass of the membrane casting solution contains 50-60 parts by mass of the inorganic powder, 5-15 parts by mass of the pore-forming agent, 5-8 parts by mass of the additive and the balance of the solvent; the prepared membrane casting solution forms an inorganic hollow fiber membrane precursor through a spinning technology, organic matters in the precursor are removed through a sintering process, and meanwhile, a uniform pore structure is formed in the membrane by burning off the spherical pore forming agent. And for a metal film in the inorganic hollow fiber membrane, the metal hollow fiber membrane can be obtained by continuously switching to roasting in a reducing atmosphere. The method for producing an inorganic hollow fiber membrane according to the present application can easily produce an inorganic hollow fiber membrane capable of achieving both high porosity and narrow pore size distribution.

The present application provides a kind of porous abradable seal coating and its preparation method, the porous abradable seal coating includes base phase coating and spherical hole, the spherical hole is uniformly distributed in the base phase coating, the aperture of the spherical hole is 10-150 μm.The porous abradable seal coating provided by the present application has spherical hole, and the spherical hole is not easy to densify in the surface in the abrading process, in the abrading process, the place where coating is impacted and rubbed because the existence of spherical hole occurs crushing and produces retreat, and does not affect the combination of other places of coating, thus improves the abradability of coating, so that the abradability of coating can be maintained well in the whole service process, prolongs the service life of coating.

The invention belongs to the technical field of grinding wheel abrasives, and particularly relates to a diamond porous microsphere, a grinding wheel abrasive and a preparation method and application thereof. The preparation raw materials of the diamond porous microspheres comprise mixed powder, a binder and water, the mixed powder comprises a first ceramic bond, diamond and a pore forming agent. The first ceramic bond, the diamond and the pore forming agent are used as raw materials for preparing the diamond porous microspheres, the diamond porous microspheres have natural pores and prefabricated spherical pores, the porosity is high, and the self-sharpening performance of the grinding wheel grinding material can be improved; the grinding wheel abrasive material is prepared through secondary air degreasing sintering of the diamond porous microspheres, a new three-dimensional pore structure is formed among the naturally stacked diamond porous microspheres, the grinding wheel abrasive material with a'natural pore + prefabricated spherical pore + stacked pore 'multi-stage pore structure is obtained, the cooling, lubricating and chip removal effects of a grinding wheel can be greatly improved, and the service life of the grinding wheel is prolonged. Therefore, the grinding performance and the service life of the grinding wheel are improved.

The invention belongs to the technical field of solid oxide fuel cells, and particularly relates to an electrode catalyst of a solid oxide fuel cell suitable for sulfur-containing fuel. The NiMo-YSZ electrode catalyst with the straight hole and spherical hole composite structure is prepared through a tape casting-phase conversion method and a vacuum-assisted impregnation process; the mass transfer efficiency and the specific surface area are improved by a composite pore structure in the obtained catalyst, and Mo actively captures sulfur by virtue of dual mechanisms of surface selective adsorption and bulk phase chemical sulfur fixation and can be dynamically regenerated. H2S can be reduced from 120 ppm to 14 ppm, and the removal rate reaches 88%; when the catalyst is operated in sulfur-containing hydrogen and methanol for 300 hours, the performance stability is respectively improved by 160% and 125%, the decline rate is as low as 0.4 mV / h, 98% of initial performance is regenerated and recovered, the tradeoff bottleneck of'activity-stability 'is broken through, and reliable support is provided for efficient and stable application of sulfur-containing hydrocarbon fuel SOFC (solid oxide fuel cell).

The application relates to the technical field of building materials, and discloses a kind of negative carbon high-performance concrete and a preparation method thereof, adopt ferrochrome slag as aggregate, utilize slag powder, silica fume and waste stone powder to partially replace cement to prepare concrete, which not only reduces natural resource and energy consumption, reduces CO2 emission, but also promotes efficient utilization of industrial solid waste; in addition, the mechanical interlocking structure is formed between the spherical pores on the surface of ferrochrome slag and cement stone, which can improve the interface microstructure between aggregate and cement paste; at the same time, the olivine phase on the surface of the spherical pores dissolves and occurs carbonation reaction under high-temperature alkaline environment during high-temperature carbonization process, and needle-like magnesium carbonate crystals are generated in the spherical pores to fill the interface, thereby further optimizing the interface microstructure and improving the overall mechanical properties of the concrete.

The invention discloses a porous GNP / PDMS composite material, a preparation method thereof and application of the porous GNP / PDMS composite material in a flexible sensor, and belongs to the technical field of flexible sensors and preparation of the flexible sensors. According to the preparation method, expanded polystyrene microspheres are taken as sacrificial templates to be combined with glucose, a spherical pore structure is constructed through a vacuum infiltration method, graphene is dispersed in a PDMS matrix by adopting a multi-step ultrasonic dispersion technology, and porous GNP / PDMS composite materials with different graphene contents are obtained. On the basis, a conductive electrode and a flexible packaging layer are combined to construct a high-sensitivity flexible sensor. Results show that the GNP / PDMS composite material containing 4 wt.% of graphene shows excellent mechanical properties, the elastic modulus is 2.43 MPa, the maximum tensile strength is 1.46 MPa, meanwhile, the recovery of more than 99.6% is maintained after 200 times of compression cycles, and the composite material shows very strong mechanical stability.

The invention discloses multi-element solid waste foam concrete and a preparation method thereof, and relates to the technical field of foam concrete. The multi-element solid waste foam concrete comprises slag, fly ash, ardealite, sodium dodecyl benzene sulfonate and water, the invention relates to an alkali-free concrete which comprises the following components in parts by mass: 250-350 parts of fly ash, 5-20 parts of aluminum powder and 0-20 parts of a liquid alkali-free accelerator, and further comprises the following components in parts by mass: 250-350 parts of fly ash, 5-20 parts of aluminum powder and 0-20 parts of a liquid alkali-free accelerator. Compared with the traditional foam concrete, the materials used in the invention are all industrial solid wastes, and cement is not doped, so that the carbon emission of cement production is reduced while the solid wastes are consumed and the solid waste stockpiling pressure is relieved. When the multi-element solid waste foam concrete is applied to an outer wall enclosure structure, due to the fact that the multi-element solid waste foam concrete is light in weight, has many spherical pores, excellent heat preservation performance and low dry density, the self-weight pressure of a high-rise building is reduced, cold and heat transmission paths are reduced, the heat conductivity coefficient is lower, and a large amount of energy consumed by refrigeration and heat is reduced.

The invention relates to the technical field of oil-gas exploration, in particular to a pore structure parameter calculation method based on pore type recognition, which comprises the following steps of: firstly, recognizing pore types and surface porosity through logging information and a rock core experiment, constructing a nuclear magnetic T2 spectrum based on the surface porosity, then recognizing the pore types and calculating the porosity of different pore types based on the logging information, and calculating the pore structure parameters of different pore types. The method comprises the following steps: firstly, calibrating the porosity of a nuclear magnetic T2 spectrum, then subdividing the nuclear magnetic T2 spectrum of matrix pores, corrosion pores and crack pores on the basis of the nuclear magnetic T2 spectrum subjected to porosity calibration, finally, splitting the nuclear magnetic T2 spectrums of different pore types into corresponding spherical pore spectrums and tubular throat spectrums on the basis of a bulb tube pore structure model, and calculating corresponding pore structure parameters. According to the technical scheme, the problems that most of laboratory image methods are qualitative analysis, the pores and the throats cannot be distinguished in a mercury injection experiment, the experiment measurement cost is high, data points are discrete, and nuclear magnetic resonance T2 spectrums of different pore types cannot be distinguished in current nuclear magnetic resonance logging are solved by identifying the pore types and calculating the pore structure parameters.

The present invention aims to provide a method for preparing and applying a hydrotreating protectant for heavy residue oil, belonging to the field of catalyst preparation. The method includes the following steps: preparing an alumina sol and adding spherical carbon particles to the alumina sol; mixing the materials evenly and then forming droplets; drying and calcining the formed material to obtain an alumina support with spherical pores; hydrothermally treating the alumina support with spherical pores in an organic ammonium solution; drying and calcining the treated material to obtain another alumina support; impregnating the alumina support with an impregnation solution containing an active metal component; and drying and calcining the impregnated support to obtain the hydrotreating protectant. The hydrotreating protectant prepared by this method has large surface pores with good permeability and high internal pores that can accommodate metal impurities. This catalyst is suitable for the field of heavy residue oil hydrotreating.

The utility model discloses a pipeline welding chuck and a pipeline welding fixture, which belong to the technical field of pipeline welding equipment, and comprise a fixed clamping block, a spherical hole, a round jack and a connecting column, the fixed clamping block is arranged on the surface of one end of the connecting column, the round jack is arranged in the connecting column and extends to the outer surface of the connecting column, and the spherical hole is arranged on the spherical hole. And the spherical hole is formed between the connecting column and the fixed clamping block and is communicated with the circular insertion hole. The problem that in the prior art, due to the fact that the fixing mode is single, the chuck is inconvenient to replace, and the angle is difficult to adjust, the application range is poor is solved. And the practicability and the universality are improved.

The utility model discloses a high-temperature and high-pressure sealed electrical penetration assembly, relates to the technical field of electrical penetration assemblies, and is used for solving the problems that the existing penetration assembly is damaged due to factors such as vibration, thermal expansion and cold contraction in the operation process of a nuclear power station, and the stability of electric power and signal transmission cannot be ensured. The penetration piece comprises a glass sintering shell of a penetration piece main body part, wherein the glass sintering shell is connected with a flange through a clamping ring; a plurality of elastic steel ball assemblies are installed on the glass sintering assembly and matched with corresponding spherical holes in the flange to form a damping mechanism. And a combined metal O-shaped sealing ring is arranged on the end surface of one side of the glass sintering shell. Through the structural design, the radiation resistance, the high temperature resistance, the aging resistance and the sealing performance are improved, reliable electrical connection is provided in an extreme environment, and the problem that steering is needed in penetration piece installation is solved.

The invention belongs to the field of metal additive manufacturing, and relates to a preparation method of a formed test block containing prefabricated micropores, which comprises the following steps: 1) obtaining an initial base material sample containing a flat and smooth surface; (2) forming spherical holes in the flat and smooth surface of the initial base material sample in a machining manner; 3) filling the spherical holes with a sublimable material, and curing the sublimable material in the spherical holes; 4) sealing the spherical hole filled with the sublimable material to obtain a base material sample after hole sealing; and (5) continuously forming on the base material sample after hole sealing until a formed test block containing the prefabricated micropores is formed. The invention provides the preparation method of the formed test block containing the prefabricated micropores, which can be compatible with metal additive manufacturing process characteristics and can be used for accurately prefabricating the controllable pores.

The utility model relates to the technical field of lighting equipment, in particular to auxiliary lighting equipment for mining equipment maintenance, which comprises a base, a first powerful magnet is fixedly connected to the bottom end of the base, a U-shaped seat is rotatably connected to the top end of the base, a shell is rotatably connected to the middle of the U-shaped seat, and a lighting lamp is fixedly connected above one end of the shell. A clamping device is fixedly connected to one side of the shell, a second powerful magnet is fixedly connected to the upper portion of the other end of the shell, a containing groove is formed in the lower portion of the other end of the shell, a spherical hole is formed in the middle of the containing groove, a hook is rotatably connected to the interior of the spherical hole, and a spotlight is fixedly connected to the top end of the shell. During use, the LED lamp beads which are high in brightness and reasonably arranged are matched with the optical lens, so that the sufficient and uniform lighting effect can be achieved, all parts of mining equipment can be clearly lighted, and the maintenance efficiency is further improved.

This invention discloses a galvanometer mechanism and a laser processing apparatus. The galvanometer mechanism includes a carrier, a galvanometer, a drive module, and a first sealing member. The carrier has a mounting cavity and a spherical hole connecting the mounting cavity and the outside of the carrier. The galvanometer is disposed within the mounting cavity. The drive module is mounted in the spherical hole and partially extends into the mounting cavity to connect with the galvanometer. The drive module located within the spherical hole has a spherical surface, which rotatably engages with the spherical hole. The first sealing member is disposed between the hole wall and the spherical surface of the spherical hole and is arranged circumferentially around the drive module. The technical solution of this invention can achieve effective sealing of the optical path while simultaneously enabling galvanometer position adjustment.

The invention discloses functional bioactive glass as well as a preparation method and application thereof, and relates to the technical field of regenerative medical materials.The functional bioactive glass provided by the invention takes silicon, calcium, phosphorus and sodium as basic components, a porous structure is constructed by introducing nano zinc oxide (ZnO), and hydrophilicity and dispersity are improved by utilizing short amylose surface grafting. The nano zinc oxide is used as a pore-forming template and is selectively dissolved out in the subsequent steps to form sphere-like pores with the pore diameter of 1-30nm and the porosity of 30-70%, so that physical support is provided for cell adhesion and bone tissue ingrowth. The short amylose is grafted on the surface of the glass through a covalent bond of an amino silane coupling agent, and hydroxyl (-OH) on a molecular chain of the short amylose and water molecules form a hydrogen bond, so that the contact angle of the material is obviously reduced, and particle aggregation is effectively inhibited.

The invention provides iron tailing-based composite artificial soil as well as a preparation method and application thereof. The artificial soil comprises an iron tailing-based porous aggregate and a functional compound component loaded on the iron tailing-based porous aggregate, the iron tailing-based porous aggregate has a three-dimensional network pore structure formed by mutually connecting fiber type pores and spherical pores in series. Through the synergistic effect of the porous aggregate and the functional compound component, the functions of water permeation, balance keeping and nutrient slow release are achieved, and the problems of iron tailing resource utilization, mine ecological restoration and degraded soil treatment are solved.

This invention discloses a process for in-situ solidification preparation of fine-grained diamond grinding wheels, comprising the following steps: (1) preparation of a microemulsion pore-forming agent; (2) preparation of a diamond forming slurry; (3) in-situ solidification and forming of the diamond grinding wheel; (4) drying of the diamond grinding wheel green; and (5) sintering of the diamond grinding wheel. Compared with ceramic-bonded diamond grinding wheels prepared by the traditional dry pressing method, the ceramic-bonded diamond grinding wheels prepared by this invention have a more uniform microstructure, and the uniformly distributed spherical pores within the sintered body can better accommodate chips and improve the self-sharpening properties of the grinding wheel. The diamond grinding wheels prepared using this invention not only improve grinding efficiency but also reduce the surface roughness of SiC wafers, demonstrating significant potential for promotion and application.

The invention belongs to the field of thermal management materials, and particularly relates to a preparation method of high-thermal-conductivity graphene foam with a uniform spherical pore structure. The method comprises the following steps: carrying out ultrasonic dispersion treatment on a graphene oxide solution, uniformly mixing the graphene oxide solution with a polymer microsphere emulsion, and preparing a composite film through an ordered assembly method; then carrying out heat treatment on the composite film, and preparing reduced graphene oxide foam while removing the microspheres; and carrying out graphitization treatment on the reduced graphene oxide foam to obtain the graphene foam with high thermal conductivity. The introduction of the polymer microspheres enables the graphene foam to form a uniform porous structure, and induces a part of graphene sheets to be vertically arranged, so as to form a continuous high-thermal-conductivity network, and at the same time promotes defect repair and grain growth in the graphitization process, so as to significantly improve the thermal conductivity of the graphene foam. The graphene foam prepared by the method disclosed by the invention has the excellent performances of small density, uniform spherical pore structure, low contact thermal resistance, high thermal conductivity, high temperature resistance, adjustable pores and the like.

The application aims to provide a spherical alumina carrier and a preparation method thereof, and belongs to the technical field of material synthesis. 2 The alumina carrier prepared by the application has a surface covered with hexagonal plate-shaped alumina particles, the hexagonal plate-shaped alumina particles grow in a directional manner on the surface of the alumina carrier and in the micrometer spherical pores, the size of the hexagonal plate-shaped alumina particles is 0.5-1 micrometers, the plate-shaped particles are interwoven to form 100-600 nm channels, the specific surface area of the spherical alumina carrier is 160-290 m 2 / g, and the pore volume is 0.8-1.0 mL / g. The alumina carrier prepared by the application has an open surface channel, a body phase containing through macroporous channels, a uniform carrier morphology, high mechanical strength, and is easy to be filled into a reactor bed, and is suitable for preparing a catalyst for a heterogeneous catalytic reaction.

The application belongs to the technical field of lubricant additives, and particularly relates to boron-doped silica microspheres with a hierarchical pore structure, a preparation method thereof and application. The boron-doped silica microspheres with a hierarchical pore structure provided by the application have a regular spherical morphology, good dispersibility, stable structure, and two different size pore structures, including ordered spherical pores and randomly distributed nanopore structures; the coexistence of the two different size pore structures improves the oil storage capacity of the modified silica microspheres as lubricant additives, facilitates the transmission and diffusion of lubricating oil, and improves the lubricating effect. In the application, an organic complex formed by mixing a surfactant and an acrylic acid homopolymer is used as a template, a silicic acid skeleton is formed through the interaction between a silicon source and the organic template, boron is introduced into the skeleton through the interaction between the silicic acid and a boron source, and the synthesis of boron-doped hierarchical mesoporous silica microspheres is realized through drying and calcination.

The invention discloses a preparation method of a porous ceramic material for an electronic cigarette, and relates to the field of porous ceramic materials. Cotton fibers loaded with nano calcium carbonate are used as a pore-forming agent, after high-temperature sintering, the cotton fibers can be carbonized at high temperature to form pores, calcium carbonate can be further decomposed on the pores to form micron-sized spherical pores, a multi-stage structure of'large-pore oil guiding and small-pore oil locking 'is formed, meanwhile, a carbon skeleton can be left after the cotton fibers are carbonized, and the pore-forming effect is improved. Supporting and reinforcing effects can be achieved in the porous ceramic material, and the risk of breakage is reduced; the porous ceramic for the electronic cigarette is placed in a KH570 silane coupling agent solution, a layer of film is formed on the surfaces of calcium oxide and the ceramic, the wear resistance of the surfaces is improved, erosion of chemical components in tobacco tar can be resisted, the service life of the porous ceramic for the electronic cigarette is prolonged, the lipophilicity of the treated ceramic surface is improved, and the porous ceramic has better tobacco tar adsorption and release performance. According to the prepared porous ceramic material for the electronic cigarette, the strength and the oil guiding performance of the porous ceramic material are improved.

The invention discloses a one-dimensional hollow carbon nanomaterial constructed on the basis of spherical pores and a preparation method and application thereof, and belongs to the technical field of mesoporous materials.According to the method, Fe3O4 nanospheres are induced by a magnetic field to be assembled into a chain structure, after silicon dioxide is coated, super-assembly is conducted on the surface by means of PS-PEO-PVP block copolymer micelles, and the one-dimensional hollow carbon nanomaterial is obtained. And performing dopamine coating, high-temperature carbonization and template etching to obtain the one-dimensional hollow carbon nanomaterial with spherical macropores which are communicated with one another and ordered spherical mesopores which are uniformly distributed on the inner wall of the one-dimensional hollow carbon nanomaterial. The length of the material is 600 nm to 1 [mu] m, the dispersity is good, and the structure is adjustable. Experiments show that the composite material shows power generation voltage higher than that of commercial carbon nanotubes and excellent cycling stability in evaporation direct-current power generation, and has wide application prospects in the fields of efficient electrodes, catalyst carriers and the like.

The invention relates to a preparation method of a ceramic dental implant with a porous structure on the surface. The ceramic dental implant comprises an inner compact ceramic layer and an outer porous ceramic layer. The inner layer is formed by compounding 3Y-TZP zirconium oxide nano ceramic powder with nano hydroxyapatite, so that a high-strength substrate is ensured. The outer layer contains the same zirconia powder, micron hydroxyapatite and a dual-mode pore-forming agent, the pore-forming agent is composed of micron PMMA microspheres and micron PLGA fibers, a hierarchical pore structure with the thickness of 200-800 microns and the porosity of 40%-60% is formed, and spherical pores and a through pore channel network are integrated. A gradient transition area is arranged between the porous layer and the compact layer, the thickness is larger than or equal to 50 micrometers, the aperture is continuously decreased from 80 micrometers to 5 micrometers, and the content of hydroxyapatite is 10-20 vol%. According to the preparation method, structural control is achieved through layered powder filling, cold isostatic pressing forming and staged sintering, and the final implant has mechanical strength, bionic porosity gradient and efficient osseointegration activity.

The invention discloses a micro-motion platform which comprises an air floating ball, a ball seat, a plurality of air channels, an adsorption part and an adjusting column. Wherein the air floating ball comprises a bearing surface and a spherical surface arranged at one end of the bearing surface; a spherical hole structure is arranged on the ball seat in a penetrating mode and accommodates the spherical surface of the air floating ball, the inner wall of the spherical hole structure is tightly attached to the spherical surface, and the spherical hole structure and the spherical surface share the same sphere center. The plurality of air passages are uniformly distributed on the inner wall of the spherical hole structure; the adsorption part is arranged in the spherical hole structure; the first end of the adjusting column penetrates through the spherical hole structure to be connected with the spherical surface of the air floating ball, the second end of the adjusting column is a free end, and the free end of the adjusting column can drive the air floating ball to rotate in the ball seat after being stressed and pushed. The positioning precision and the bearing capacity of the micro-motion platform are improved, and the problem that an existing micro-motion platform is difficult to meet high precision and large bearing capacity at the same time is solved.

Provided are: a porous film which is capable of satisfactorily removing minute foreign matter in a chemical liquid by filtration; a method for producing the porous film; and a method for producing a purified chemical liquid for use in the production of a semiconductor element, the method including performing filtration using the porous film.　The present invention uses a porous film in which at least a portion of the surface of a porous base film is coated with a coating layer containing a polyamide resin, wherein the porous base film has a plurality of spherical holes therein, in which the plurality of spherical holes are connected to adjacent spherical holes to form communicated holes.

The self-lubricating bearing comprises a ball socket and a ball head, a spherical hole is formed in the ball socket, and arc-shaped grooves are formed in the upper side and the lower side of the spherical hole; a ball head is embedded in the spherical hole, and a shaft hole is formed in the ball head; an annular groove is formed in the surface of the shaft hole, and two lubricating films with semicircular cross sections are detachably connected into the annular groove. According to the self-lubricating bearing provided by the utility model, by arranging the spherical hole and the arc-shaped groove, the ball head can be pressed into the arc-shaped groove and then rotated by 90 degrees, so that the ball head can be mounted in the spherical hole of the ball socket, and the self-lubricating bearing is convenient to mount and dismount; and meanwhile, the lubricating film is detachably connected into the annular groove of the ball head, so that sliding friction is generated when the ball head and the connecting shaft rotate in a matched mode, stability and smoothness during rotation are improved, and the service life of the ball head is prolonged.

A jacking force prediction method for a whole construction process by a vertical jacking method, based on a spherical hole expansion theory and a shear failure principle, uses two jacking force calculation models. The models include a spherical hole expansion-sliding friction model and a shear failure-sliding friction model, and corresponding calculation formulas are deduced. When an overlying soil layer is high and the jacking force calculated by adopting the spherical hole expansion-sliding friction model is relatively small, a spherical hole expansion problem occurs at a vertical pipe cover. When the overlying soil layer is relatively low and the jacking force calculated by adopting the shear failure-sliding friction model is relatively small, a soil body failure form at the vertical pipe cover is shear failure.

This invention relates to the field of powder bed additive manufacturing technology, specifically a low-cost, easy-to-machine, medium-strength titanium alloy rapid prototyping method. The specific steps are as follows: S1, raw material metal powder preparation; S2, part blank printing; S3, part post-processing; S4, finishing. The inner surface layer of the blank is connected to the interior of the blank and is processed in a single pass. The outer surface layer is connected to the inner surface layer and is processed in at least two passes. A suitable energy density ensures near-complete compactness within the blank. The formation of unfused defects on the outer surface layer facilitates machining. Near-spherical pore defects on the inner surface layer prevent damage to the surface quality of the machined part due to crack propagation during cutting and also contribute to material removal during machining. A reasonable element ratio and low-temperature annealing ensure the mechanical properties of the material.

The application provides a polyimide lithium battery diaphragm and a preparation method thereof, and relates to the technical field of lithium battery diaphragms. The diaphragm has spherical or ellipsoidal holes formed by the rupture of thermal expansion microspheres. The thermal expansion microspheres and a dispersing agent are dispersed in a polyamide acid solution, then the mixed slurry is made into a wet film, and the gelation of the polyamide acid and the expansion and rupture of the thermal expansion microspheres are simultaneously completed by cooperating with multi-stage temperature rising heat treatment, so that the average pore diameter and porosity of the holes of the required diaphragm can be obtained, the process is simple, and the process is suitable for large-scale production and preparation. The average pore diameter and porosity of the holes of the diaphragm are highly controllable in the process.