73 results about "Volume expansion" patented technology

The invention discloses a double-component reinforced 5Y-PSZ dental ceramic material and a preparation method thereof, and relates to the technical field of ceramic material preparation. The method comprises the following steps: mixing ZrCl4 and deionized water, and dropwise adding an ammonia water solution to prepare m-ZrO2 nano ceramic powder; zrOCl2. 8H2O, Y (NO3) 3.6 H2O and deionized water are mixed, the m-ZrO2 nano ceramic powder and polyethylene glycol 2000 are added, and the material is prepared through calcination, spray granulation, hot-pressing presintering and high-temperature sintering. According to the 5Y-PSZ dental ceramic material disclosed by the invention, the nano-scale m-phase ZrO2 is adopted as a reinforcing material and is dispersed and distributed inside the 5Y-PSZ, and through volume expansion generated by t-m phase change of the m-phase ZrO2, the anti-aging performance is guaranteed, and meanwhile, the reinforcement of the 5Y-PSZ dental ceramic material is realized. The invention solves the problem of insufficient strength of the 5Y-PSZ dental ceramic material in the prior art.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a hydrogen storage material, a preparation method thereof and a hydrogen storage system. The hydrogen storage material comprises the following raw material components in percentage by mass: 90%-97.5% of hydrogen storage alloy powder, 1%-5% of a volume expansion buffering agent, 1%-5% of a heat conduction material and 0.5%-3% of an additive, the additive comprises at least one of a silane coupling agent and polyimide; the preparation method comprises the following steps: mixing the raw material components, carrying out cold press molding, carrying out heat treatment for 4-12 hours in an inert atmosphere at the temperature of 110-150 DEG C, and cooling to obtain the hydrogen storage material.

The invention relates to the technical field of geotechnical engineering and slope reinforcement, and discloses a foam concrete-based expansive soil slope reinforcement structure which comprises a slope body and a foam concrete prefabricated reinforcement assembly mounted on the slope body through anchor rods, and the reinforcement assembly comprises a first reinforcement layer and a second reinforcement layer which are sequentially arranged on the slope surface of the slope body; the first reinforcing layer comprises a plurality of first reinforcing units arranged in the length direction of the slope body. By means of the double-layer design of the first reinforcing layer and the second reinforcing layer, the first prefabricated slab is longitudinally connected in an inserted mode through a dovetail or T-shaped tenon-and-mortise structure to achieve seamless attachment, the second prefabricated slab presses and covers tenon-and-mortise joints and is clamped and locked through the annular connecting piece, a latticed system of transverse restraining and longitudinal locking is formed, the structure can resist volume expansion of expansive soil by 30% or above, and the expansive soil is not prone to deformation. A soil body loss channel is effectively blocked, and the linkage problem of loosening-cavity-instability of a traditional prefabricated part is solved.

The application discloses a graphene-diamond composite coating and a preparation method and application thereof, and belongs to the technical field of materials. The graphene-diamond composite coating comprises a diamond coating and a graphene coating; graphene sp2 bond structure is covalently combined with diamond sp3 bond structure; and the graphene coating has a graphene structure with non-parallel growth mainly in a vertical direction. The graphene-diamond composite coating has small lattice mismatch between the diamond and the graphene, avoids volume expansion caused in a friction heat process, and has the advantages that the diamond coating can provide a support layer for the graphene, forms super-strong C-C covalent bonds at an interface, and significantly improves the adhesion strength of the graphene; the graphene can avoid brittle fracture of the diamond, and significantly improves the lubricating performance of the surface of the diamond coating. The composite coating has better wear resistance, a low friction coefficient and excellent oxidation resistance, and can remain stable under high-temperature and high-load working conditions, so that the service life and processing efficiency of wear-resistant parts are improved.

This invention discloses a secondary chemically strengthened UFG glass and its preparation method, relating to the field of ultrathin flexible glass technology. The secondary chemically strengthened UFG glass, by molar percentage, comprises the following raw materials: SiO2: 59.85%~69.43%, Al2O3: 11.81%~18.45%, Na2O: 7.5%~10.48%, Li2O: 6.7%~9.0%, B2O3: 0~3.7%, MgO: 0~3.65%, P2O5: 0~4.59%, and SnO2: 0.9%. After the UFG glass undergoes two chemical strengthening processes, the volume expansion rates of the first and second regions of the UFG glass, which have varying thicknesses, are equal. This avoids problems such as distortion, deformation, and wrinkles that easily occur in the strengthened cover glass, improving the yield and facilitating large-scale production.

The invention relates to the field of metal nano material preparation, and discloses a supersonic gas atomization preparation method of high-dispersity spherical nano aluminum powder, which comprises the following steps: establishing a constant-temperature aluminum melt flow, and constructing a supersonic gas-solid two-phase atomization jet flow; nitrogen with the temperature lower than the melting point of the particles is used for carrying flow, solid zinc stearate particles are carried and accelerated to supersonic speed, and the aluminum melt flow is impacted; solid rigid momentum of the particles penetrates through an aluminum liquid interface to enter liquid drops, thermal relaxation time difference is used for inducing the particles to generate phase change decomposition in the liquid drops, the liquid drops are broken from the inside through volume expansion, and a carbon-zinc composite isolation layer is formed in situ through decomposition products. And high-efficiency nanocrystallization crushing under low energy consumption is realized.

The application relates to the technical field of fluid control valve devices, in particular to a parallel multi-stage check valve which is characterized in that a plurality of groups of check valve assemblies which are vertically distributed are connected in parallel at the outlet end of a main flow pipe, the opening threshold of each group of the check valve assemblies increases from top to bottom, and the outlet ends of all the check valve assemblies are fixedly connected in common with a discharge pipe; each group of the check valve assemblies comprises a main valve body which is integrally fixedly connected by a liquid inlet section, a volume expansion section and a liquid outlet section in sequence, the left end of an elastic connecting piece is coaxially fixedly connected with an umbrella-shaped valve flap, the outer edge of the umbrella-shaped valve flap is coaxially fixedly connected with a conical cover which is matched with a conical inner wall, a waterproof hammer cylinder is coaxially slidably abutted with a vertical rod, the waterproof hammer cylinder is coaxially provided with an elastic buffer piece which is fixedly connected with the vertical rod, the lower end of a mounting disc is coaxially fixedly connected with a main sealing plug which is movably abutted with the inner wall of the waterproof hammer cylinder, and the vertical rod is fixedly connected with an outer sealing assembly which is used in cooperation with a sealing groove.

This invention discloses a preparation method and application of Al2O3 self-reinforced zirconia medical ceramic material, belonging to the field of bioceramic material preparation. The preparation method includes the following steps: first, aluminum particles are surface passivated, then mixed with Y2O3-ZrO2 ceramic powder, a dispersant, and a binder to prepare a slurry; the slurry is obtained through spray granulation and dry pressing; finally, the finished product is obtained through atmosphere sintering, oxygen absorption reaction, and high-temperature sintering. This invention utilizes the volume expansion effect of in-situ generated Al2O3 to artificially introduce a beneficial local compressive stress field into the zirconia matrix, effectively compensating for the phase transformation strengthening effect lost due to increased yttrium oxide content. This achieves a synergistic improvement in the mechanical properties and anti-aging properties of zirconia all-ceramic materials, solving problems such as insufficient anti-aging performance of existing zirconia all-ceramic materials, significant strength decrease after adding yttrium oxide, and insufficient strengthening effect of traditional Al2O3 second-phase addition.

A composite molded article in which thermoplastic resin expanded beads are bonded via a thermosetting resin binder, wherein the composite molded article has a density of 0.05 to 0.5 g / cm3, and when heated at 100° C. for 20 minutes, the composite molded article has a volume expansion rate of 15 to 200%.

This invention provides a hardened body utilizing slag containing free MgO, such as steelmaking slag. This hardened body suppresses volume expansion caused by hydration reactions based on free MgO and addresses insufficient strength. The hardened body utilizing slag containing free MgO is manufactured by adding water to a mixture containing slag containing free MgO as a material, kneading the mixture, and then solidifying the mixture. In this hardened body, the unit amount of slag containing free MgO is 2000 kg / m³. 3 The following is the unit weight of alumina cement: 75 kg / m³ 3 Above and 200kg / m 3 The following unit weight of blast furnace slag powder is 330 kg / m³. 3 Above and 530kg / m 3 The following calculations use B2O3 as the unit amount for boron-containing substances, which is 0.5 kg / m³. 3 Above and 4.0 kg / m 3 the following.

This invention discloses a method for coating a silicon-based anode material surface. The method utilizes a liquid-phase coating technique to achieve a controllable thickness of an alumina film on the surface of a silicon-based substrate. The thickness of the alumina film is 1-50 nm. The formula for precisely controlling the thickness of the alumina film is as follows: M=S AA *m*d*K / c, M: precursor mass, S AA : Specific surface area of ​​raw material, d: coating thickness, c: molecular weight percentage of aluminum in the precursor, K: coating coefficient, which is related to the precursor and ranges from 1.55 to 2.25. This invention uses a liquid-phase coating method, which features simple equipment, convenient operation, and easy large-scale production. It achieves good versatility and economy. Through dense alumina film coating, excellent interfacial stability can be achieved, effectively suppressing the volume expansion effect of silicon, thereby effectively blocking direct contact between the electrolyte and the silicon substrate, suppressing side reactions, reducing active lithium loss, and improving cycle stability.

The present application relates to the technical field of building materials, and particularly relates to a foamed slurry with volume expansion and shrinkage characteristics and a preparation method thereof.The foamed slurry comprises the following components in a weight ratio: 1000 parts of dry slag; 200-300 parts of a curing agent; 650-750 parts of water; 1-3 parts of a foaming agent; 1-2 parts of an anti-dispersant; and 2-4 parts of a stabilizer.The foamed slurry with volume expansion and shrinkage characteristics is stable in volume after curing, and can be subjected to volume compression transportation, filling and other operations in the uncured stage due to the presence of internal closed-cell flexible bubbles, and is suitable for engineering scenarios such as ground reinforcement, tunnel support, anti-seismic structure, cavity filling and underground plugging.

The invention discloses a method for collecting and testing slow expansion force, which comprises the following steps of: filling an expansion body material into a thin-wall metal tank, injecting an absorption medium, placing an amorphous thin-wall metal tank into a liquid medium, transferring mechanical force generated by expansion of the expansion body material to the liquid medium through the amorphous thin-wall metal tank, and converting the mechanical force into hydraulic force for measurement. And slow expansion force data is obtained. By adopting the innovative process method, the pressure vessel is uniformly stressed, the acquired data is accurate and reliable, the test is continuous, the operation is simple, and the universality is high. On the premise of ensuring low cost, energy conservation and environmental protection, the expansion pressure corresponding to the volume expansion rate of various slow expansion materials under different media and different temperatures can be tested, and actual data support is provided for the slow expansion materials in engineering application.

This invention discloses a multi-level carbon-coated ternary composite material and its preparation method, comprising the following steps: S1: Nanoscale wet grinding of single-crystal NCM and expanded graphite, allowing NCM to be inserted between the expanded graphite layers, followed by drying to obtain mixture 1; S2: Mixing mixture 1 from S1 with medium-temperature pitch to obtain mixture 2; S3: Low-temperature sintering of mixture 2 obtained in S2, followed by crushing to obtain the multi-level carbon-coated ternary composite material. This invention embeds single-crystal NCM into the expanded graphite layers through grinding, improving the electronic conductivity of NCM and enhancing rate performance. The expanded graphite adapts to the volume expansion of single-crystal NCM during charge and discharge, maintaining close contact between materials, thereby improving cycle life. The secondary coating of the material with low-softening-point medium-temperature pitch further reduces the contact area between single-crystal NCM and the electrolyte, improving cycle stability. The medium-temperature pitch can complete carbonization at a lower temperature, avoiding the collapse of the NCM structure during high-temperature carbonization.

The utility model relates to the technical field of rock breaking, and discloses a dry ice rapid sublimation rock breaking device. The dry ice rapid sublimation rock breaking device comprises multiple layers of charging structures sequentially arranged in a blast hole (2) in a rock body (1) from bottom to top, a blocking object (9) blocking the opening of the blast hole (2), and a detonating device (8) penetrating through the blocking object (9) to be connected with each layer of charging structure through a detonating agent (7), each charging structure sequentially comprises a heating material layer (5), a water layer (3), an air spacing layer (6) and a dry ice layer (4) from bottom to top, and the detonating agents (7) are arranged between the heating material layer (5) and the water layer (3) and between the water layer (3) and the air spacing layer (6) and can be detonated through the detonating device (8). The dry ice rapid sublimation rock breaking device is extremely high in sublimation speed, strong in volume expansion force, high in rock breaking speed and good in effect.

The invention provides a pressure balancing structure for a radiation source oil tank, and relates to the technical field of medical imaging equipment, the pressure balancing structure comprises an oil tank main body and a balancing bag body, at least one radiation generating mechanism is arranged in the oil tank main body, the oil tank main body is filled with an insulating medium, and the balancing bag body is arranged in the oil tank main body and is communicated with an inner cavity of the oil tank main body; wherein the balance capsule body is deformed in response to the volume change of the insulating medium caused by the temperature change, so as to maintain the pressure balance inside and outside the oil tank main body. By arranging the breathing bag in the oil tank, the volume expansion and shrinkage of the insulating oil caused by temperature change can be automatically responded, so that the internal pressure of the oil tank is always kept in dynamic balance with the external atmospheric pressure, and the problem of pressure fluctuation caused by thermal expansion and cold contraction of the oil in the oil tank is avoided.

The disclosure relates to an expandable scaffold and a method for fabricating the scaffold. The expandable scaffold includes a three-dimensional porous structure comprising a composite material composed by a first material and a second material. The 3D porous structure has a tunable expansion capacity. When applied in a liquid, the 3D porous structure may uptake the liquid and expand from an original volume to an expansion volume up to 1000 times of the original volume. The 3D porous structure may be formed by a plurality of layers of the composite material, and architecture and shape of the layers of the composite material are arranged in accordance with a shape and a size of the expansion volume. Applications of the scaffold may include a bone or soft tissue regeneration system or a bleed stopping device.

The invention relates to the technical field of processing of modified iron-based alloy materials for precision molds, and discloses a preparation method of a modified iron-based alloy material for a precision mold with a low expansion characteristic, and the preparation method comprises the following steps: performing induction melting on a matrix, and introducing niobium and vanadium to construct a nucleation center; performing forging, spheroidizing annealing and austenitizing treatment on the blank; in the spraying cooling stage, the secondary change trend of the surface layer temperature along with the time change is monitored in real time so as to recognize the crystallization latent heat characteristic, then the spraying duration time is adjusted, and a martensite structure distributed discretely is induced and generated in the blank. And through dynamic balance adjustment of cold flow energy and latent heat release, a prestress field opposite to a thermal expansion vector is constructed, and the dimensional stability of the material under the high-hardness working condition is effectively improved.

The application discloses a strip steel residual stress control method based on finish rolling temperature regulation and phase change time difference, and relates to the technical field of strip steel heat treatment control. The strip steel residual stress control method provided by the application regulates the finish rolling temperature when the strip steel is produced to regulate austenite distortion energy and dislocation density, so that the phase change kinetics path is changed. The method provided by the application can ensure microstructure refinement of high-strength steel, realize the synergistic optimization of residual stress and performance, compress the phase change time difference of the middle part and the edge part of the strip steel, weaken the uncoordinated volume expansion strain from the source, and realize the accurate control of residual stress and the improvement of plate shape quality.

The application discloses a kind of based on double-component reinforced 5Y-PSZ dental ceramic materials and preparation method thereof, it is related to ceramic material preparation technical field.The method includes the following steps: ZrCl4 and deionized water are mixed, drop into ammonia solution, and m-ZrO2 Nano ceramic powder is prepared;ZrOCl2·8H2O, Y (NO3) 3·6H2O and deionized water are mixed, m-ZrO2 Nano ceramic powder and polyethylene glycol 2000 are added, and are prepared by calcination, spray granulation, hot-pressing pre-sintering and high-temperature sintering.The application uses nanometer m-phase ZrO2 as reinforcing material, which is dispersedly distributed in 5Y-PSZ, and the volume expansion generated by t-m phase transition of m-phase ZrO2 is used to ensure the anti-aging performance and realize the strengthening of 5Y-PSZ dental ceramic material.The application solves the problem of insufficient strength of 5Y-PSZ dental ceramic material in the prior art.

The self-compensating expansion shell type anchor rod comprises a sleeve, a piston rod, a pushing piece and an expansion piece, the piston rod is slidably connected into the sleeve, the expansion piece is connected to the sleeve, the pushing piece is connected to the piston rod and acts on the expansion piece, a pushing hole for the pushing piece to stretch out is formed in the sleeve, and a cylinder body is arranged in the sleeve; the end of the piston rod extends into the cylinder body, the end, extending into the cylinder body, of the piston rod and the inner wall of the cylinder body form an expansion cavity, and phase-change materials are arranged in the expansion cavity. The phase change material in the expansion cavity is heated through a high ground temperature layer in the rock mass, the phase change material is subjected to phase change under the action of high ground temperature, the piston rod is pushed to slide in the sleeve due to volume expansion, and the piston rod slides to push the expansion part to expand outwards from the inside of the sleeve through the pushing part to extrude the rock mass; therefore, the prestress loss in the service period of the anchor rod is automatically compensated, the reinforcing effect of the prestress anchor rod in a high-ground-temperature tunnel is enhanced, and the service life of the anchor rod is prolonged.

A gear having volume expansion for cavitation reduction in a gear pump mesh. The gear has a gear tooth profile; a body; a plurality of involute gear teeth extending radially outward from the body and including first and second neighboring gear teeth each having a respective tip and a root, the first and second neighboring gear teeth defining a space between them; and a root pocket formed directly into the roots of the gear teeth and in the space between the gear teeth, providing an increased gear root volume and adding trapped fluid compliance while leaving unaltered the gear tooth profile. Also disclosed is a gear pump including the gear.

The utility model discloses hollow glass with good sound insulation and heat insulation effects, and belongs to the field of glass. Hollow glass with good sound insulation and heat insulation effects comprises a frame and a limiting structure, the limiting structure is formed on the inner side face of the frame, and the limiting structure is filled with a sealing piece. The at least three groups of glass are arranged on the limiting structure, a first hollow cavity and a second hollow cavity are formed between two adjacent groups of glass, inert gas and vacuum are respectively arranged in the first hollow cavity and the second hollow cavity, and a first functional coating is arranged on the glass surface forming the first hollow cavity and the second hollow cavity; heat energy transfer between the first glass and the second glass can be reduced, the heat insulation effect of the device is improved, the noise transmission effect can be effectively reduced, the sound insulation effect of the device is improved, the environment in the hollow cavity can be prevented from volume expansion or shrinkage due to temperature or air pressure change through the sealing piece, and the service life of the device is prolonged. And internal air pressure is ensured to be in a balanced state.

The present invention provides a metal-based coating agent that imparts excellent corrosion resistance and adhesion to a substrate even when the substrate is at a high temperature. A metal-based coating agent in which the total of zinc particles (A) and Al particles (B), i.e., (A) + (B), is 10 to 51 mass% relative to the total mass of the metal-based coating agent, the mass ratio of zinc particles (A) relative to Al particles (B), i.e., (A) / (B), is 0.9 to 9.0, the ratio of a silane coupling agent (C) relative to (A) + (B), i.e., (C) / ((A) + (B)), is 10 to 50 mass%, the volume expansion ratio of a solvent (D) from a liquid to a gas is 500 times or less, the ratio of the solvent (D) relative to the total of the solvent (D) and water (E), i.e., (D) / ((D) + (E)), is 20 to 80 mass%, and the total content of water-based resins selected from the group consisting of water-soluble resins, water-based resin emulsions, cellulose-based resins, and polysaccharides is 0.15 mass% or less relative to the total mass.

This invention belongs to the field of steel welding and discloses a method for improving welding deformation of high-strength alloy steel. When austenite transforms into martensite in high-strength alloy steel, it is accompanied by volume expansion. Different martensitic transformation temperatures result in different amounts of volume expansion, ultimately leading to varying degrees of welding deformation. Adding an appropriate amount of Sn element powder to the deposited metal powder can effectively change its martensitic transformation temperature. By adjusting the martensitic transformation temperature, welding deformation can be reduced, which can significantly control the degree of welding deformation in high-strength alloy steel.

Provided is a metal mold including: a fixed mold; a movable mold that is movable in an opening / closing direction with respect to the fixed mold, that forms, between itself and the fixed mold, a first cavity extending in a direction intersecting the opening / closing direction, and a second cavity extending from an end of the first cavity in the intersecting direction to an opening direction with respect to the fixed mold, and that expands volumes of the first cavity and the second cavity when moved in the opening direction; and a slide mold that is movable relatively with respect to the fixed mold, that forms an end portion of the second cavity in the opening direction, and that maintains its position relative to the fixed mold with respect to a volume expansion operation of the first cavity and the second cavity by the movable mold.

Provided is an injection-molding device capable of remarkably reducing residual air in a cavity and producing a wax mold that has higher fidelity to the shape of the cavity.　An injection-molding device (10) has: an injection part (24) capable of abutting a rubber mold (3); a wax tank (21) for pressurizing and storing wax; a vacuum tank (22) connected to a vacuum pump; a wax valve (31) for opening and closing a passage (21L) which connects the injection part (24) and the wax tank (21); and a first suction valve (32) for opening and closing a passage (22L) which connects the injection part (24) and the vacuum tank (22). The injection-molding device (10) further has: a volume expansion chamber (23); a volume expansion mechanism (40) for expanding the volume of the volume expansion chamber (23); and a second suction valve (33) for opening and closing a passage (23L) which connects the injection part (24) and the volume expansion chamber (23).

The utility model discloses an expansion pipeline of a plunger pump, which belongs to the technical field of plunger pumps and comprises a shell, a plunger is slidably connected in the shell, a piston is arranged on the outer side of the plunger, the inner wall of the piston and the inner wall of the plunger are jointly in threaded connection with a first bolt, and a dismounting block is clamped in the shell. And three sets of dismounting plates are jointly clamped in the dismounting block and the shell, two baffles are clamped in the shell, the inner wall of each baffle is in threaded connection with two second bolts, and the outer surface of each second bolt is in threaded connection with the inner wall of the shell. According to the capacity expansion pipeline of the plunger pump, by taking out the standby circular ring with the large opening inner diameter stored in the first storage frame, the inlet and outlet caliber of the pipeline can be changed, and the situation that when the plunger pump needs to convey oil efficiently due to the fact that the caliber sizes of the piston, the oil inlet pipe and the oil outlet pipe cannot be adjusted, the impact sound of a piston in the plunger pump is too large is effectively avoided; and cracks of the pipeline and the buffer tank often occur.

The application discloses a kind of modular component self-pressure fusion splicing method and system, belong to space on-orbit manufacturing technical field.The method comprises: providing first module element and second module element with self-locking structure, at least one module element connection area has densification layer higher than matrix density;Assemble the first module element with second module element;Heating makes densification layer area melt, utilize the volume expansion in the process of melting is limited in the connection interface and generates self-pressure, and solidification forms connection under the self-pressure.By adjusting the densification degree, the self-pressure value can be preset, and different connection requirements can be flexibly adapted.The application realizes high-quality connection without external pressure and inert gas protection through the synergistic effect of self-locking structure and densification layer melting expansion, and the joint performance based on theoretical calculation can approach the level of base material.The optional anchoring structure further increases the solidification contact area and improves the connection strength.It is especially suitable for large-scale component on-orbit manufacturing in microgravity environment such as space station, lunar base and the like.