113 results about "Average diameter" patented technology

A method to achieve a yield ratio of 0.60 or more in a component from non-heat-treated steel having bainitic microstructure. The component includes a predetermined chemical composition, in mass %, in amounts such that a value of F1 obtained by Formula (1) is 0.65% or more, with the balance as Fe and inevitable impurity. Bainitic microstructure area fraction is 85% or more and Retained austenite area fraction is 5% or less. Crystal grains of the bainitic microstructure have an average diameter of 10 μm or more and 25 μm or less, an average aspect ratio of 0.5 or more, and an average ratio of crystal grain boundary length to crystal grain circumference of 60 or less.F⁢1=C+Si / 24+Mn / 6+Ni / 40+Cr / 5+Mo / 4+V / 14(1)

The invention relates to a hollow silicon dioxide microsphere and a preparation method and application thereof, the hollow silicon dioxide microsphere has a dielectric constant less than or equal to 2.5, a dielectric loss tangent angle less than or equal to 0.001, a purity greater than 95%, a sphericity rate greater than or equal to 99%, a wall thickness greater than 0 and less than or equal to 0.42 [mu] m, and an average diameter of 0.1 [mu] m-5 [mu] m, and the hollow rate, the wall thickness and the average particle size satisfy a relational expression, eta is the hollow rate, t is the wall thickness, and R is 1 / 2 of the average particle size. The hollow silicon dioxide microspheres provided by the invention are high in spherical rate, firm in wall thickness, uniform in particle size distribution, high in purity, relatively excellent in dielectric property and extremely low in content of metal impurities, and can meet the application requirements of high-speed and high-frequency substrates, in addition, the preparation method provided by the invention is few in adopted raw materials, simple in preparation process, low in cost and high in efficiency.

The invention provides a fiber-reinforced silicon dioxide aerogel composite material, which is characterized in that a fiber felt formed by two kinds of glass fibers is used as a reinforcing material, one kind is hollow short fibers with the average diameter of 5.0-25 microns and the length of 0.5-2.0 mm, the other kind is superfine fibers with the average diameter of 0.6-5.0 microns and the length of 0.5-3.0 mm, and the difference between the average diameters of the two kinds of fibers is at least 3 microns. The fiber reinforced composite material provided by the invention has very strong mechanical properties and very low heat conductivity coefficient, and can exert excellent thermal insulation efficiency as a building thermal insulation material.

The invention provides an L-band wave-absorbing material and a preparation method thereof, the wave-absorbing material comprises a Fe-Si-Al composite material, and the composite material is Fe-Si-Al soft magnetic particles with oxide layers formed on the surfaces; wherein the content of each element in the raw materials of the Fe-Si-Al soft magnetic particles is as follows: 84.5 to 85.5 weight percent of Fe, 9.5 to 10 weight percent of Si and 5 to 5.5 weight percent of Al; the diameter-thickness ratio of the Fe-Si-Al soft magnetic particle raw material is 50-100, and the average diameter of the Fe-Si-Al soft magnetic particle raw material is 20-40 [mu] m; and the thickness of the oxide layer is 5-12 nm. The wave-absorbing material disclosed by the invention has excellent low-frequency wave-absorbing performance and has the characteristics of being thin, light, wide and strong; the impedance matching Z of the wave-absorbing material is larger than or equal to 4, the minimum reflectivity of a product with the thickness being 5 mm is smaller than-10 dB within 1-2 GHz, and the wave-absorbing material can be suitable for being used under multiple wavelengths of the L wave band and meets the use requirement of the wave-absorbing material.

A three-dimensional product formed by additive manufacturing, the three-dimensional product includes a plurality of continuous filaments arranged in a geometric pattern, where the plurality of continuous filaments includes a radiation-cured component and a nonradiation-cured component. A concentration of the nonradiation-cured component is in a range of greater than 5 wt % to less than 95 wt % of total weight of the three-dimensional product. The three-dimensional product includes a plurality of non-random pores located between adjacent printed continuous filaments, where an average diameter of the non-random pores is in a range of greater than 0 microns to less than 50 microns.

The invention discloses a high-toughness coating and a manufacturing method thereof, and belongs to the field of coatings. The high-toughness coating is a pure Cr layer and comprises a matrix layer and modified areas, the average grain size of the matrix layer ranges from 0.1 micrometer to 0.8 micrometer, the average grain size of the modified areas ranges from 1 micrometer to 2 micrometers, the average diameter of the modified areas ranges from 5 micrometers to 15 micrometers, and the interval between every two adjacent modified areas ranges from 0.5 mm to 1.5 mm. The high-toughness coating has good toughness and oxidation resistance, and can effectively prolong the service life and improve the reliability of the zirconium alloy in a high-temperature and high-pressure corrosion environment.

A fixing member includes a slide layer having a cylindrical shape and a thickness of 8 micrometers (μm) or more and 20 μm or less, a base layer formed on an outer side of the slide layer, and a surface layer formed on an outer side of the base layer. The slide layer has Benard convection cell structure having an average diameter of 50 μm or more and 200 μm or less on a surface that is not in contact with the base layer, and the slide layer includes an additive having a median particle diameter D50 of 4.5 μm or less and an aspect ratio of 30 or more and less than 50.

The invention discloses a method for detecting the conveying condition of a silicon steel inhibitor in a pipeline, and the method comprises the steps: obtaining the fluid density, fluid viscosity and fluid transverse average flow velocity of the inhibitor in a target pipeline, and measuring the speed of particles in the fluid and the average diameter of the measured particles; wherein the particle velocity comprises a particle transverse velocity and a particle longitudinal velocity; calculating a blockage index based on a blockage index calculation formula; meanwhile, the precipitation degree of the inhibitor in the target pipeline is obtained, and trend comparison is conducted on the precipitation degree and the blockage index; if the trends are inconsistent, adjusting a correction coefficient in a blockage index calculation formula until the trends are consistent, and forming a corresponding table of the blockage index, the precipitation degree and the transverse average flow velocity of the fluid; determining an actual blockage index based on the corresponding table and the actual fluid transverse average flow velocity; and performing early warning on the precipitation condition of the inhibitor in the target pipeline by using the actual blockage index. According to the method, the precipitation degree of the inhibitor in the pipeline is represented through the blockage index, and early warning is performed.

A polyethylene diaphragm and a preparation method thereof belong to the technical field of diaphragms. A test sample with the size of 1m * 1m is taken from the middle position along the transverse direction of the polyethylene diaphragm; respectively testing a group of first SEM pictures with magnification times of 1 thousand times and a group of second SEM pictures with magnification times of 5 thousand times at four corner positions of the test sample by using a scanning electron microscope, counting the number of crude fibers with the diameter not less than 500nm in the fibers extending along the longitudinal direction in the first SEM pictures, and counting the average diameter of the fibers extending along the longitudinal direction in the second SEM pictures. In the four first SEM pictures, the number of crude fibers in at least three first SEM pictures is not less than 15. The average diameter is not less than 200nm. The polyethylene diaphragm is provided with the coarse fibers which are proper in number and diameter and extend in the longitudinal direction, so that the polyethylene diaphragm has certain friction performance in the transverse direction, and the polyethylene diaphragm is not prone to slipping, dislocation and wrinkling in the transverse direction during rolling.

The application discloses a light diffusion plate foaming light-weight structure and a preparation method thereof. The structure comprises upper surface layer, first foaming layer, second foaming layer and lower surface layer connected in sequence. The thickness of the first foaming layer is less than that of the second foaming layer, and the average cell diameter of the first foaming layer is less than that of the second foaming layer. The application adopts the combination of the first foaming layer with small cell diameter and thin thickness and the second foaming layer with large cell diameter and thick thickness, improves the structure of the foaming light diffusion plate, and makes the density of the foaming light diffusion plate as low as 0.3 g / cm 3 , which is 50% lower than 0.85 g / cm 3 of the prior art, and the cost is significantly reduced, so that the application has obvious advantages in market competition. The average density, light transmittance and haze of the light diffusion plate can be regulated by adjusting the thickness or the average cell diameter of the first foaming layer and the second foaming layer.

Disclosed in the present invention is an ultrahigh-strength cold-rolled steel strip having a tensile strength of 1450 MPa or above, comprising Fe and inevitable impurity elements, and further comprising the following chemical elements in percentage by mass: 0.19-0.245% of C, 0.03-0.45% of Si, 0.8-1.2% of Mn, 0.001-0.004% of B, 0.05-0.15% of Cu, 0.05-0.15% of Zr, 0.005-0.05% of Ti, and 0.01-0.08% of Al. The microstructure of said ultrahigh-strength cold-rolled steel strip comprises a matrix and carbide particles uniformly dispersed in the matrix, wherein the matrix has tempered martensite the volume fraction of which is 95% or above, and the average diameter of the carbide particles does not exceed 0.5 microns. In addition, further disclosed in the present invention is a manufacturing method for said ultrahigh-strength cold-rolled steel strip, comprising the following steps of: (1) smelting and casting, (2) hot rolling, (3) cold rolling after acid pickling, (4) continuous annealing, (5) tempering, and (6) leveling.

The present invention pertains to a composite material comprising (a) at least one type of curable resin and (b) at least one type of aramid single fiber, wherein the average diameter of the aramid single fiber (b) as determined by a centrifugal sedimentation method is less than 2000 nm. According to the present invention, an article having excellent mechanical properties can be produced.

DEVICE FOR CLOSING A CONVEYOR BELT, CONVEYOR BELT AND METHOD FOR CLOSING A CONVEYOR BELT A device for closing a conveyor belt (1) comprises first and second ends (1a, 1b) defining first and second series of holes (5a, 5b). The first and second series of holes (5a, 5b) of the two ends (1a, 1b) respectively come into line with each other to close the conveyor belt (1). A first rod (6) passes through the holes of the first series of holes (5a). A second rod (7) passes through the holes of the second series of holes (5b). A separation distance between a central axis of the first rod (6) and a central axis of the second rod (7) is less than four times the average diameter of the first rod (6) and the second rod (7).

The application discloses a cold-rolled fine-blanking steel and a manufacturing method thereof. By optimizing the chemical composition and microstructure of the cold-rolled fine-blanking steel, the C content is controlled to be 0.30%-0.47%, the strength and hardness after quenching can be ensured, the Mn content is controlled to be 1.0%-1.5%, the hardenability of the steel can be improved, the hot brittleness can be prevented, and the forgeability and plasticity of the steel are improved; meanwhile, the number ratio of the spheroidal carbide is controlled to be greater than or equal to 90%, the average diameter of the spheroidal carbide is adjusted to be 0.5-0.8 mu m, any spheroidal carbide particle A is selected in a 1000 times metallographic graph of a cross section of the steel, another spheroidal carbide particle B exists in a circular area with the particle A as a center and a radius of 2 mu m, a sector with a center angle of 30 degrees and symmetrically distributed along the thickness direction of the steel is taken in the circular area, and the particle B does not fall into the sector, so that the size of the spheroidal carbide is smaller and the distribution of the spheroidal carbide is more uniform, and therefore the semi-punching limit depth can be increased.

An inductor includes a body containing soft magnetic powder and resin, a coil embedded in the body, outer electrodes on the body, and a protective film on the surface of the body. The protective film has a thickness of 10 μm or more and contains silica particles and resin. In the protective film, the silica particles have an average diameter of 15 nm to 75 nm, and the percentage by weight of the silica particles to the resin is between 150% and 250%.

To provide an Al bonding wire that exhibits excellent temperature cycling reliability and favorable bondability. The Al bonding wire contains 3.0 mass% or more and 10.0 mass% or less of Si, and an average diameter of a Si phase in a cross-section (L-section) in a central axis direction including a wire center axis of the Al alloy bonding wire is equal to or greater than 0.8 µm and equal to or less than 5.5 µm.

To provide a technology capable of enhancing heat conductivity of the whole adhesive member while maintaining flexibility, in the adhesive member.SOLUTION: A holding member comprises a first member, a second member, and an adhesive member for bonding the first and second members together. The adhesive member contains a filler. The filler contains a spherical filler and an amorphous filler. An average diameter of the spherical filler is smaller than a maximum value of a minor axis of the amorphous filler.SELECTED DRAWING: Figure 1

The present application belongs to the technical field of hot stamping part preparation, and particularly relates to a tailor-welded part, a manufacturing method thereof and a welding wire applied to the tailor-welded part. The tailor-welded part comprises a welded joint, and a weld seam of the welded joint comprises acicular ferrite and martensite. The average length of the acicular ferrite is not greater than 80 microns, the average diameter is not greater than 15 microns, and the volume percentage of ferrite in the weld seam is 0.1-10%. The tailor-welded part is a part after hot stamping treatment. The joint elongation of the tailor-welded part is greater than 4%, the weld seam structure is martensite and ferrite, the fracture position is located in the base material during the quasi-static tensile test, and the weld seam has good strength and ductility.

A decorative material having a design with an excellent tactile and a visual effect. The decorative material has a texture region on a base material, the texture region is composed of: a plurality of projection regions containing a plurality of particles with a particle size of 5 μm or more and 60 μm or less and independent of each other; and a gap region between the projection regions, and the average diameter of the circumscribed circles of the projection regions, when the texture region is viewed in plan view, is 100 μm or more and 500 μm or less.

To provide a coated cutting tool capable of extending a tool life by having excellent wear resistance, chipping resistance and fracture resistance.SOLUTION: The coating layer includes a lower layer, an intermediate layer, and an upper layer in this order from the substrate side toward the coating layer surface side, the lower layer includes a specific Ti compound layer, and the intermediate layer includes an α - Al2O3 layer, wherein the upper layer includes a TiCN layer, an average thickness of the entire coating layer is 8.5 μm or more and 30.0 μm or less, an average thickness of the upper layer is 1.0 μm or more and 6.0 μm or less, and in the TiCN layer of the upper layer, an average diameter of a region in which an orientation difference B between a normal line of a cross section in a direction parallel to a surface of the base material and a (220) plane normal line is 0° or more and less than 15° is less than 5.0 μm, and in the TiCN layer of the upper layer, 20≤RSA≤70 and 20≤RSB≤60 are satisfied.SELECTED DRAWING: Figure 1

An object is to provide a polarizing element capable of reducing insertion loss and increasing extinction ratio by adjusting the particle diameter of metal microparticles.The polarizing element (1) of the present disclosure comprises a glass substrate (2), a plurality of cavities (3) formed inside the glass substrate extending in one direction, and metal microparticles (4) arranged within each cavity having a volume smaller than the cavities, and is wherein: an average diameter of the metal microparticles, along a transversal direction orthogonal to a longitudinal direction of the cavities, is 20 nm or less, and a particle diameter of the metal microparticles, at a cumulative frequency of 90%, is 30 nm or less.

The invention discloses cold-rolled fine blanking steel and a manufacturing method thereof. The chemical components and the microstructure of the cold-rolled fine blanking steel are optimized, the content of C is regulated and controlled to be 0.30%-0.47%, the strength and hardness after quenching can be guaranteed, the content of Mn is controlled to be 1.0%-1.5%, the hardenability of the steel can be improved, hot brittleness can be prevented, and the forgeability and plasticity of the steel can be improved; meanwhile, the number proportion of the spherical carbides is controlled to be larger than or equal to 90%, the average diameter of the spherical carbides is adjusted to range from 0.5 micrometer to 0.8 micrometer, any spherical carbide particle A is selected from a 1000-time metallographic diagram of the cross section of the steel, and another spherical carbide particle B exists in a circular area with the radius being 2 micrometers with the particle A as the circle center; in the round area, a fan shape with the central angle being 30 degrees and symmetrically distributed in the steel thickness direction is taken, and particles B do not fall into the fan shape, so that the spherical carbide is smaller in size and more uniform in distribution, and the half-punching limit depth can be increased.

The invention belongs to the field of abrasive grinding tools, and particularly relates to a wafer thinning grinding wheel and a preparation method thereof.The wafer thinning grinding wheel comprises a base plate 1, an abrasive coating 11 is fixed to the end face of the base plate 1, abrasive particles are arranged in the abrasive coating 11, and the abrasive particles comprise first abrasive particles 12 located at the bottom of the abrasive coating 11 and close to the end face of the base plate 1; the abrasive material further comprises second abrasive particles 13 arranged in a layer above the first abrasive particles 12, the average diameter of the first abrasive particles 12 is 110%-140% of the diameter of the second abrasive particles 13, and the minimum diameter of the first abrasive particles 12 is not lower than 70% of the maximum diameter.

A Co2O3—Bi2O3@SiO2 nanocomposite material includes Co2O3—Bi2O3@SiO2 nanocomposite particles having a granular morphology with an average diameter in a range from 10 to 30 nanometers (nm). The Co2O3—Bi2O3@SiO2 nanocomposite material has a Brunauer-Emmett-Teller (BET) surface area of greater than or equal to 70 square meters per gram (m2·g−1). The Co2O3—Bi2O3@SiO2 nanocomposite material has an adsorption capacity for ciproflaxin of greater than or equal to 70 milligrams per gram (mg·g−1).

The invention belongs to the technical field of fiber winding, and particularly relates to a mandrel geometric dimension iterative correction method based on spiral winding. Comprising the following steps that the actual diameter of fiber winding of the ith layer on a core mold cylinder, the design thickness and the design layer number of the total number of fiber winding layers, the radius of a cylinder body of the core mold cylinder, the rotating speed of the core mold cylinder and the spiral fiber winding angle are obtained; the actual diameter deviation of fiber winding of the ith layer on the core mold cylinder, the average diameter of the current fiber winding layer on the core mold cylinder and the average size deviation of the number of the current fiber winding layers on the core mold cylinder are determined; determining an actual diameter correction coefficient of winding of the ith layer of fibers on the core mold cylinder; correcting the moving speed of the (i + 1) th layer of fiber winding end on the core mold cylinder; and iteration is carried out to a set winding layer number, and a core mold finished product is machined. The method can dynamically adjust the geometric diameter of the core mold, significantly improve the diameter precision, and ensure that the final product meets the design requirements.

The present invention provides a new pervaporation membrane suitable for separating a volatile organic compound from an aqueous solution containing the organic compound. A pervaporation membrane of the present invention includes: a separation functional layer; and a porous support supporting the separation functional layer. The porous support has a surface facing the separation functional layer, the surface including a plurality of opening portions. An average diameter of the opening portions is 0.5 μm or more. For the pervaporation membrane, a peeling strength measured by a test below is 0.15 N / 20 mm or more. Test: The pervaporation membrane is cut to 20 mm in width and 150 mm in length to give a test piece. The separation functional layer of the test piece is peeled off the porous support of the test piece at a peel angle of 180° and a tensile speed of 300 mm / min.

The application discloses a preparation process of an organic composite material with super-high salt resistance. The process comprises the following steps: obtaining the convex point shape and the convex point interval h in the micro-morphology of the film through calculation simulation; calculating the average diameter D of the convex point particles; performing heat curing treatment and de-agglomeration treatment on the dispersed polytetrafluoroethylene particles to obtain treated particles a; according to the h between the convex points, the configuration ratio of the treated particles a and the dispersed PTFE particles is obtained, the particles are mixed and stirred according to the ratio, and then fiberization treatment is performed to obtain treated particles b; the two kinds of particles are placed in layers, and an asymmetric film is formed through a stretching process; a fluorine monomer, an electrostatic conductive material and an alcohol solvent are mixed to obtain a prepared solution; the prepared solution is sprayed on the surface of a base material to obtain a treated base material; and the asymmetric film is hot-pressed and laminated on the base material to form the organic composite material. The film material is suitable for a flue gas filtration system in different industries, and is especially suitable for the purification of a medium-low temperature flue gas system with high salting-out degree.

The invention discloses a magnetic force rheological polishing solution containing graphene coated CIP composite particles and a preparation method of the polishing solution. The polishing solution comprises the following components in percentage by mass: 8-20% of rod-like mesoporous silica, 10-20% of graphene coated CIP composite particles and the balance of deionized water. 3%-10% of graphene coated CIP composite particles; 3%-10% of abrasive particles; 1%-3% of an additive; 65%-85% of polyethylene glycol; the average diameter of the rod-like mesoporous silica is 50nm-200nm, and the length-diameter ratio of the rod-like mesoporous silica is (3: 1)-(10: 1); the graphene-coated CIP composite particle is of a composite structure in which a reduced graphene oxide shell wraps a carbonyl iron powder CIP core; the average particle size of the graphene-coated CIP composite particles is 3-5 [mu] m, and the shell thickness of the reduced graphene oxide is 10-50 nm. The polishing solution can realize continuous and stable high-viscosity thickening performance, inhibits aggregation of magnetic particles, and has good oxidation resistance and suspension stability.

A lightweight aggregate according to an embodiment of the present disclosure is a granular body in which elevations with a mean diameter of less than 3.0 mm are distributed on its surface and the arithmetic mean roughness Ra of the surface without the elevations is in the range of 10 µm to 100 µm and its density is in the range of 0.9 g / cm3 to 1.3 g / cm3.

The invention discloses a closed-cell foam material for backpack equipment, the closed-cell foam material is composed of matrix resin and an elastomer component, the matrix resin is an ethylene-vinyl acetate copolymer in which the content of a vinyl acetate structural unit is 5%-15%; the closed-cell foaming material has the overall density of 0.05-0.08 g / cm < 3 >, and the average diameter of internal cells is not larger than 200 microns; the closed cell foam material exhibits a compression set rate of less than 5%. According to the closed-cell foaming material for the backpack equipment provided by the invention, light weight, high resilience and deformation resistance are realized through collaborative design of materials and a process.