99 results about "Flexural strength" patented technology

The invention discloses a gray-scale-adjustable silicon nitride ceramic material and a preparation method thereof, the apparent density of the ceramic material is 3.0-3.6 g / cm < 3 >, the Vickers hardness is 1700-2000 HV, the bending strength is 700-1000 MPa, the fracture toughness is 6.5-10 MPa.m < 1 / 2 >, the crystal form of the ceramic material is a long columnar beta-Si3N4 crystal form, and the gray-scale-adjustable silicon nitride ceramic material comprises the following raw materials by weight percent: 85-98% of alpha-Si3N4, 5-10% of SiO2, 5-10% of SiO2, 5-10% of SiO2, 5-10% of SiO2, 5-10% of SiO2 and 5-10% of SiO2. 1-8 wt% of a sintering aid and 0-10 wt% of a coloring agent

The invention provides a capillary crystalline agent core material microcapsule and a preparation method and application thereof, and relates to the technical field of material science and engineering, the capillary crystalline agent core material microcapsule comprises a wall material and a core material; the wall material comprises a water-absorbing material, the water-absorbing material comprises at least one of sodium alginate and modified sodium alginate, and the mass of the water-absorbing material is not lower than 60% of the mass of the wall material; the core material comprises a capillary crystalline agent and a dispersing agent, and the mass of the capillary crystalline agent is not lower than 60% of the mass of the core material; the mass ratio of the wall material to the core material is (3: 7): (7: 3); and the particle size of the capillary crystalline agent core material microcapsule is 50-300 microns. The capillary crystalline agent core material microcapsule is applied to concrete repair, the crystallization reaction can develop along the depth of a crack, invasion of water and corrosive ions is inhibited for a long time, the service life of the structure is prolonged by 2-3 times, and the compressive strength / breaking strength of a repaired crack area can be recovered to 90% or above of that of original concrete.

1. Name of the product in this design: Double-column tensile testing machine. 2. Purpose of this design: To test the physical properties of various products, such as tensile strength, compressive strength, and bending strength. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The present application belongs to the technical field of concrete, and discloses a method for evaluating the degradation grade of concrete aggregate caused by sulphate attack. The method comprises the following steps: first, preparing fine aggregate samples from the sulphur-containing aggregate to be evaluated; then, mixing the samples with cement and water to prepare mortar expansion rate test pieces and mortar flexural strength test pieces; next, testing the 84d expansion rate of the mortar expansion rate test pieces and the 84d flexural strength retention rate of the mortar flexural strength test pieces; finally, evaluating the grade according to the test results: if the 84d expansion rate is greater than 0.2%, the sulphate attack is determined to be strong; if the 84d expansion rate is less than or equal to 0.2% and the flexural strength retention rate is less than 80%, the sulphate attack is determined to be moderate; if the 84d expansion rate is less than or equal to 0.2% and the flexural strength retention rate is greater than or equal to 80%, the sulphate attack is determined to be weak. The present application solves the problem of the lack of a unified test method standard for sulphate attack on concrete aggregate, provides a complete test method, establishes an evaluation system for the damage grade of sulphate attack, and promotes the use of aggregate with excessive sulphur content.

The utility model belongs to the technical field of steel-plastic composite belt testing, and particularly relates to a strength testing device of a steel-plastic composite belt for an optical cable, which comprises a support table, and a control box is arranged above the support table; the testing mechanism comprises a testing table and a driving push rod, the testing table is fixed to the top of the supporting table, a supporting plate is fixed to the testing table, an air pressure rod is fixed to the supporting plate, an output shaft of the air pressure rod is fixedly connected with the testing plate, the testing plate is slidably connected with the testing table, and the driving push rod is arranged in the control box and fixed to a connector. The fixing mechanism comprises a connecting plate, a connecting shaft is fixed to the connecting plate, a rotating cylinder is rotationally connected to the interior of the connecting plate and is in threaded connection with a fixing rod, and the fixing rod is fixedly connected with the fixing plate; under the condition that the steel-plastic composite belt is not disassembled, detection in different modes is carried out, the tensile strength and the bending strength of the steel-plastic composite belt can be effectively tested, the steps of repeated disassembly and assembly can be reduced, and the detection efficiency of the test is improved.

The present application belongs to the technical field of gathering and storage tank repair, and particularly relates to a storage tank wall reinforcing method and a composite material liner for reinforcing a storage tank wall, comprising: selecting a composite material liner with optimal performance parameter values from N different structures of composite material liners according to performance parameters, and recording the selected composite material liner as a selected composite material liner; the performance parameters include tensile strength and bending strength; the structure of the composite material liner comprises, from inside to outside, k1 layers of square cloth, k2 layers of four-axis cloth and k3 layers of carbon fiber cloth; if the difference between the wall thickness of the storage tank wall after being reinforced by the selected composite material liner and the minimum thickness of the storage tank wall is greater than or equal to L1, and L1>0, then the selected composite material liner is determined to be suitable for the storage tank wall; and the selected composite material liner is used to reinforce the storage tank wall to which the selected composite material liner is suitable. Thus, the present application solves the problem of high repair cost of the storage tank wall in the prior art.

The invention discloses a (Ti, W) C-AlCrCoNiMo high-entropy metal ceramic material as well as a preparation method and application thereof, and belongs to the technical field of metal ceramic materials. The invention provides a metal ceramic material which is prepared by taking (Ti, W) C ceramic as a matrix, adding Al, Cr, Co, Ni and Mo as a high-entropy alloy binding phase, carrying out two-step wet-dry composite ball milling process treatment and carrying out spark plasma coupling high-frequency induction sintering. The problem of segregation can be solved after two-step wet-dry composite ball milling process treatment, ideal pre-alloyed powder is obtained, the components are more uniform, the dispersity is better, and the composite powder treated by an optimized ball milling method is sintered through spark plasma coupling high-frequency induction. And the high-entropy metal ceramic material with high bending strength, high hardness and excellent fracture toughness can be obtained at the sintering temperature of 1300 DEG C.

The application relates to the technical field of automobile stabilizer bars, and particularly discloses an anti-rollover new energy automobile stabilizer bar and a fatigue testing device thereof, which comprises a hollow rod body and connecting parts fixed at two ends of the rod body, characterized in that a helical reinforcing rib extending along the axial direction of the rod body is embedded in the inner wall of the rod body; the rod body is respectively provided with a first working section for bearing a torsional load and a second working section for bearing a bending load, and the wall thickness of the first working section is greater than that of the second working section. The application has the effect of improving the torsional stiffness and bending strength of the stabilizer bar.

This invention discloses an early-strength, high-crack-resistant cementitious material suitable for water conveyance tunnel linings. It is composed of nano-silica, metakaolin, granulated blast furnace slag powder, cement, fly ash, limestone powder, and waste alumina whiskers. By controlling the particle size distribution of each component, the overall particle size distribution curve closely matches a pre-set mathematical model, thus achieving multi-scale filling from nanometer to micrometer scales. The early-strength, high-crack-resistant cementitious material, after uniform mixing of all components, exhibits a 3-day compressive strength >32 MPa and a flexural strength >5.6 MPa; a 28-day compressive strength >58 MPa and a flexural strength >9.0 MPa. Using standard mortar mix proportions, a circular restraint cracking test was conducted, and the 28-day crack width was controlled within 0.2 mm. This material combines rapid early strength development, excellent volume stability, and outstanding crack resistance, making it suitable for strongly restrained structural engineering.

The application relates to the technical field of cement breaking resistance detection, and particularly discloses a cement breaking resistance strength detection device, which comprises a test table, test block support columns, bearing cylinders, mounting shafts, clamping plates, power mechanisms, supporting mechanisms and positioning mechanisms. When the cement test block is broken into two pieces, the broken test block drives each bearing cylinder to pour to one end, in the process, the power mechanism drives the clamping plate to clamp and fix the cement test block, so that the cement test block cannot directly fall on the test table after being broken; the supporting mechanism can support the rotating bearing cylinder, so that the bearing cylinder stops after rotating to a fixed position; when the cement test block needs to be taken down, the bearing cylinder is rotated to the initial position, the position of the bearing cylinder is limited by the positioning mechanism, and the cement test block can be conveniently taken down; in the process, the broken cement test block is clamped and fixed, so that the cement test block cannot directly fall on the test table, and the splashing of the debris is reduced as much as possible.

This invention discloses a dielectric ceramic substrate material with a negative capacitance temperature coefficient, its preparation method, and its application, relating to the field of functional ceramics technology. It comprises, by mass percentage, 76wt%~93.5wt% CaTiO. 3 2wt%~15.5wt% SrTiO 3 1wt%~8.5wt% MgTiO 3 The ceramic substrate material contains 1.5wt%~3.2wt% modifier and 2wt%~4.5wt% cooling agent. It possesses excellent flexural strength, good surface roughness, and bonding strength, making it suitable for fabricating miniaturized chip-type microwave monolayer ceramic capacitors with low dielectric loss. It exhibits a negative temperature coefficient of capacitance (-(1500±500)ppm / ℃, (-55~125)℃), which can compensate for capacitance drift caused by temperature changes and prevent signal distortion. Furthermore, it is flat, non-deformable, and has good rectangularity, exhibiting excellent surface properties.

This utility model discloses a glass bending strength testing machine, belonging to the field of glass strength testing. The glass bending strength testing machine has a rectangular hollow frame set on the outer edge of a base. Protective structures are provided on all four sides of the frame. A discharge channel is formed between the long side of the base and the frame, located below the base. A glass collection box is detachably connected inside the discharge channel. A pressing mechanism is located at the top center of the frame. A guide rail is provided on the base along its length, and at least two sets of movable seats are slidably connected to the guide rail. Support rollers are provided on the movable seats. The pressing mechanism is located between the two sets of support rollers, with its output end facing the plane of the support rollers. This utility model can monitor and record the pressure value applied to the glass sample in real time, providing a reliable basis for subsequent data analysis and evaluation. It can also distribute the force applied by the pressure rollers to prevent stress concentration and improve the accuracy of glass strength testing.

To provide an inspection method of a chip capable of solving the problem that when the chip is broken by applying a load to the center of the chip in inspecting flexural strength, fine fragments are widely scattered when the chip is broken, and it is difficult to remove the fragments from a measuring device of the flexural strength.SOLUTION: According to another aspect of the present invention, there is provided a chip testing method for testing a die strength of a chip having a first surface and a second surface opposite to the first surface, the chip testing method including a preparing step of preparing a die strength testing apparatus including a support terminal for supporting the chip and a load terminal having an indenter for applying a load to divide the chip, a resin laying step of laying a resin on the first surface of the chip on which the load terminal acts, and a placing step of placing the second surface of the chip on the support terminal in the condition where the first surface of the chip is opposed to the load terminal. The breaking strength inspection method includes at least a breaking strength inspection step of bringing the load terminal into contact with the one surface to inspect the breaking strength of the chip, and a removal step of removing the broken chip from the breaking strength inspection apparatus, and scattering of broken pieces of the broken chip is suppressed by the laid resin.SELECTED DRAWING: Figure 6

The application discloses a method for determining the flexural strength of concrete after freeze-thaw cycles, and comprises the following steps: measuring the dynamic elastic modulus of the concrete; taking the dynamic elastic modulus, the initial flexural strength of the concrete, the flexural strength loss coefficient and the air pressure influence coefficient as inputs, and calculating the flexural strength of the concrete based on a flexural strength prediction formula; the application analyzes the dynamic elastic modulus and the flexural strength of the concrete, establishes the relationship between the dynamic elastic modulus and the flexural strength of the concrete with the increase of the freeze-thaw cycle times, proposes a prediction formula for the flexural strength of the concrete after freeze-thaw cycles, so that the dynamic elastic modulus of the concrete only needs to be detected, and the flexural strength can be obtained through corresponding calculation, damage to the existing concrete during measurement is avoided, and nondestructive testing of the concrete is realized.

The application discloses a mechanical expanding and contracting shaft for winding round nut spring ring, which is suitable for wide-to-narrow metal foil, high-end aluminum foil, electromagnetic foil, hand-tearing steel foil and solar film. In view of the problems of capsule air leakage, large radial runout of the shaft, low bending strength, small external expansion force, intermittent slipping between the winding drum and the tube and the like of the existing air bag and individual mechanical shaft, a novel structure expanding and contracting shaft composed of three mechanisms is provided. Under the action of the one-time rotation of the round nut and the secondary thrust amplification mechanism of the spring ring / tapered surface mechanism, a three-ton external expansion clamping force can be generated. After the external expansion of the winding drum and the tube, the gaps in the shaft can disappear automatically, so that the radial runout accuracy of the shaft is improved, and the bending resistance of the shaft in the suspended shaft drawing and the winding is improved. The shaft diameter adjusting mechanism before the expansion of the shaft can make the shaft be used in multiple ways. The cross pulling of the double-hook wrench can improve the external expansion force of the shaft by 50%. The shaft of the application is small in diameter and has no inflatable capsule, and can replace the shaft for thick and thin shearing machine.

This invention relates to the field of metal matrix composite technology, and discloses a high-strength, toughness, and wear-resistant iron-based ceramic composite material, its preparation method, and its application. The composite material includes an iron-based alloy matrix and a reinforcement distributed therein. The preparation method mainly includes: mixing aluminum borate whiskers with tantalum powder, sintering them by spark plasma to form a porous preform, and then densifying the preform with iron-based alloy foil through a hot-pressing melting process. This invention, through a core-shell structure reinforcement design, utilizes a tantalum-rich shell layer to coordinate the performance differences between the ceramic phase and the iron matrix, strengthens the interfacial bonding, and thus simultaneously improves the hardness, flexural strength, impact toughness, and wear resistance of the composite material. This material is suitable for manufacturing components that withstand high-stress impact wear in fields such as mining machinery and engineering equipment.

The present invention relates to a glass-ceramic material for coating a glass or glass-ceramic disc and to the disc coated with the material. It has high optical density, high fracture strength, and high flexural strength.

An ultra-thin aluminum composite television back panel comprises an aluminum composite matrix consisting of a surface aluminum plate, a corrugated aluminum alloy core layer, and a bottom aluminum plate. The surface and bottom aluminum plates are made of high-purity aluminum alloy with a thickness of 0.2-0.5 mm, accounting for 40-60% of the weight; the core layer has a corrugation height of 0.5-1.0 mm and accounts for 30-50% of the weight. Nanoscale carbon fibers with a mass fraction of 5-10% and an aspect ratio of 20-60 are distributed within the matrix as a reinforcing phase. The back panel exhibits a gradient thickness structure, thicker at the edges and thinner at the center, with an edge thickness of 1.2-1.5 mm and a center thickness of 0.8-1.2 mm. Due to its unique composite structure and reinforcing phase distribution, the back panel exhibits excellent comprehensive performance, with a flexural strength greater than 200 MPa, a thermal conductivity greater than 150 W / m·K, and a surface flatness of less than 0.1 mm / m, achieving ultra-thinness while simultaneously meeting the requirements for high-strength support and efficient heat dissipation.

An electrode structure and preparation methods thereof, the electrode structure includes a substrate and a sintered body, wherein the sintered body is formed on the surface of the substrate, and the sintered body is provided with cracks that are formed after the hydration treatment of the sintered body. The continuity of cracks of the electrode structure was good, and the preparation method is suitable for industrial production. The electrode structure with cracks can effectively increase the bending strength and reduce the stress during the winding process of the electrode structure, thereby reducing the risk of fracture during the application process. It can also improve the flexural strength of the electrode structure while maintaining the original high electrostatic capacity and lower leakage current value of the electrode structure, without negatively affecting the performance of the electrode structure.

The invention relates to the technical field of drainage system pipe network non-excavation repair, in particular to a repair method for an inspection well. The method comprises the steps that firstly, treatment work is conducted before hose repairing; 2, a material treatment stage; step 3, a curing stage; a non-excavation well chamber repairing mode is adopted, the operation area is small, the structure is simple, the manufacturing cost is low, and the repairing speed is high; the composition material is a UV-CIPP material, the performance of the UV-CIPP material in the x direction, the y direction and the z direction is basically close to that of the UV-CIPP material, the bending strength of the UV-CIPP material in the x direction, the Y direction and the Z direction is larger than 200 MPa, the structural strength is high, and the UV-CIPP material can cope with most scenes; the service life is long and the compactness is good.

This invention belongs to the field of composite ceramics technology, specifically relating to a shell-like composite ceramic with both high strength and toughness, its preparation method, and its applications. The composite ceramic obtained by this invention possesses a layered micro-heterogeneous structure resembling a shell, comprising a "brick" layer composed of sheet-like alumina and a first whisker, and a "mud" layer composed of nano-alumina particles, a second whisker, and nanosheets. The "brick" and "mud" layers are alternately stacked. Specifically, the material composition and structure are precisely controlled through multiple freeze-drying processes to establish the micro-heterogeneous structure, which is then combined with hot-pressing sintering to obtain the composite ceramic with the shell-like micro-heterogeneous structure. The composite ceramic prepared by this invention exhibits excellent flexural strength and fracture toughness, and has broad application prospects in the fields of machinery, electronics, and aerospace.

The invention discloses a zirconia ceramic matrix with high thermal shock resistance as well as a preparation method and application thereof. The zirconia ceramic matrix comprises a matrix and a coating layer a; the matrix comprises the following components: 90-98 wt% of zirconium oxide; 1.5 to 8 wt.% of a stabilizing agent; % of a grain boundary regulating agent; the stabilizing agent is prepared from the following components in percentage by weight: 2.0 to 4.0 percent of Sc2O3, 0.5 to 1.5 percent of Yb2O3 and 0.3 to 1.0 percent of Er2O3; the grain boundary regulating agent is a composition of a boron source and an aluminum source; in the coating layer a, the molar ratio of zirconium to aluminum is (2-3): 1; and the component 1 is polyvinyl alcohol or polyvinylpyrrolidone. The fracture toughness, bending strength and thermal shock resistance of the ceramic matrix are effectively improved, and the overall mechanical property is remarkably improved. When the material bears thermal shock, the thermal shock resistance of the material is improved, and the application scene of the zirconia ceramic material is expanded.

The application discloses an improved silica ceramic antenna window with a density of 1.8-1.9 g / cm 3 , a bending strength of 55-65 MPa, a tensile strength of 35-45 MPa, a thermal conductivity of 0.5-0.6 W / m.k, a dielectric constant of 3-3.8, and a loss tangent of 0.0004-0.0006. The composite die molding method of the improved silica ceramic antenna window comprises the following steps: preparing a premix, feeding, die molding, drying, high-temperature treatment, impregnation, post-impregnation heat treatment, and polishing and finishing. The silica ceramic antenna window obtained by the composite die molding method has a good surface quality, is free of pits, slag dropping, cracking and the like, and has the advantages of high apparent quality, high mechanical strength, high density and stable performance. The die molding method can quickly complete molding without mechanical processing, and has the advantages of simple process, high production efficiency, high product yield, stable product performance and low production cost.

This invention discloses an alumina-based thermal shock resistant composite material and its preparation process, belonging to the field of composite material technology. The process includes gradient preform preparation, reinforcement interface modification, directional arrangement of thermal stress buffer units, in-situ reaction electric field-assisted sintering, and steam pre-oxidation post-treatment steps. This invention employs a three-layer micro-gradient structure design. The surface layer relies on nano-alumina and SiC whiskers, possessing both high hardness and wear resistance. The middle layer, through phase transformation toughening, effectively absorbs crack propagation energy and inhibits crack extension. The core layer uses porous mullite composite, whose low coefficient of thermal expansion significantly buffers thermal stress. Structurally, this design balances high strength and high toughness, improving the material's flexural strength, fracture toughness, and thermal shock resistance, and preventing through-crack formation under thermal shock.

A process for manufacturing a copper-clad laminate comprises forming a thermoplastic layer, forming a stack by laying up at least a first copper foil layer and the thermoplastic layer, and laminating the stack by application of heat and pressure for a time sufficient to form the copper-clad laminate. The thermoplastic layer comprises from 15 wt. %to 70 wt. %of a thermoplastic resin comprising a syndiotactic polystyrene having a melt flow rate in a range of from about 1 g / 10 min to about 100 g / 10 min; from 5 wt. %to 70 wt. %of a first filler having a dielectric constant of greater than 4.0 under 2.5 GHz; from 5 wt. %to 40 wt. %of a second filler having an aspect ratio of greater than 1; from 0 wt. %to 15 wt. %of a third filler different from the first and the second filler; from 0 wt. %to 15 wt. %of a compatibilizer; and from 0 wt. %to 2 wt. %of an additive. The thermoplastic layer has a dielectric constant of greater than 3.5, a dielectric loss no greater than 0.0030 under 2.5 GHz, and a flexural strength of greater than about 70 MPa.

The utility model discloses a centralized winding stator protection structure, which comprises a shell, a plurality of assembly grooves are arranged at the upper position of the outer wall of the shell, the protection structure of this design integrally adopts PBT and is additionally provided with a 30% glass fiber material structure, has high toughness and fatigue resistance, and has better mechanical properties such as tensile strength, bending strength and the like; a lead limiting column is arranged on the upper end surface of the protection mechanism, so that the moving position of a lead sleeve of the stator can be limited, and abnormal operation caused by the fact that the lead sleeve moves within the inner diameter of the stator or touches an area of a motor shell during operation of the motor is avoided; the device has the advantages of protecting vulnerable elements in the stator, prolonging the service life, mainly aiming at protection of enameled wires, improving the operation safety of the motor, reducing the electric shock risk of testers, improving the product performance, preventing interference of an external electromagnetic field to the interior of the motor, and enabling the motor to operate more stably.

The utility model provides a composite formwork of a reinforcement cage and UHPC (Ultra High Performance Concrete), which belongs to the technical field of UHPC formworks, and comprises a UHPC formwork formed by solidifying ultra high performance concrete, the reinforcement cage for improving fracture resistance is implanted in the UHPC formwork, and the reinforcement cage comprises rectangular reinforcements and positioning reinforcements; the two rectangular steel bars are arranged in parallel up and down to form a group, and the rectangular steel bars are horizontally embedded into the UHPC concrete formwork; the positioning steel bars are longitudinally implanted into the UHPC concrete formwork, and the multiple positioning steel bars are arranged along the four side edges of the rectangular steel bars; the problem that the UHPC formwork structure is low in strength is solved, and the composite formwork is large in overall strength, high in loading capacity and high in application durability.

The invention discloses a high-entropy rare earth aluminate based on light / heavy rare earth combination, the chemical formula of the high-entropy rare earth aluminate meets RE4Al2O9, RE is a rare earth element combination and is composed of a light rare earth element and three heavy rare earth elements, the number of the rare earth elements is four, and the substance amount ratio of the light rare earth element to the three heavy rare earth elements is 1: 1: 1: 1; the material is of a single-phase structure and has high-temperature stability. The preparation method comprises the following steps: firstly, carrying out solid-phase sintering, and then carrying out ball milling and sieving. When the material is used as a thermal barrier coating material, hot pressed sintering is carried out, and the Young modulus of 180-210 GPa, the shear modulus of 70-90 GPa, the bulk modulus of 130-150 GPa, the Vickers hardness of 9.1-9.2 GPa, the bending strength of 190-220 MPa and the fracture toughness of 2.9-3.2 MPa.m < 1 / 2 > are obtained. The thermal conductivity is 1.61-1.87 W.m <-1 >. K <-1 > in the temperature range of 25-1000 DEG C, and the thermal conductivity is 2.07-2.22 W.m <-1 >. K <-1 > at the high temperature of 1200 DEG C.