73 results about "Uniaxial pressure" patented technology

This invention relates to a method for producing components with internal architectures, and more particularly, this invention relates to a method for producing structures with microchannels via the use of diffusion bonding of stacked laminates. Specifically, the method involves weakly bonding a stack of laminates forming internal voids and channels with a first generally low uniaxial pressure and first temperature such that bonding at least between the asperites of opposing laminates occurs and pores are isolated in interfacial contact areas, followed by a second generally higher isostatic pressure and second temperature for final bonding. The method thereby allows fabrication of micro-channel devices such as heat exchangers, recuperators, heat-pumps, chemical separators, chemical reactors, fuel processing units, and combustors without limitation on the fin aspect ratio.

Initially, an Yb₂O₃ raw material was subjected to uniaxial pressure forming at a pressure of 200 kgf/cm², so that a disc-shaped compact having a diameter of about 35 mm and a thickness of about 10 mm was produced, and was stored into a graphite mold for firing. Subsequently, firing was performed by using a hot-press method at a predetermined firing temperature (1,500° C.), so as to obtain a corrosion-resistant member for semiconductor manufacturing apparatus. The press pressure during firing was specified to be 200 kgf/cm² and an Ar atmosphere was kept until the firing was finished. The retention time at the firing temperature (maximum temperature) was specified to be 4 hours. In this manner, the corrosion-resistant member for semiconductor manufacturing apparatus made from an Yb₂O₃ sintered body having an open porosity of 0.2% was obtained.

Provided is a polycrystal MgO sintered body which is capable of having a sintered density close to a theoretical density thereof, and exhibiting excellent mechanical properties and heat conductivity, while reducing contamination of an atmosphere due to gas generation, and a production method for the sintered body. The polycrystal MgO sintered body has a unique crystalline anisotropy in which (111) faces are oriented along a surface applied with a uniaxial pressure at a high rate. The polycrystalline MgO sintered body is obtained by a method which comprises the steps of: sintering an MgO raw material powder having a particle size of 1 μm or less, under a uniaxial pressure; and then subjecting the sintered powder to a heat treatment under an atmosphere containing 0.05 volume % or more of oxygen, at a temperature of 1273 K or more for 1 minute or more.

Embodiments of the invention are directed to a method for production of a nuclear fuel pellet by spark plasma sintering (SPS), wherein a fuel pellet with more than 80% TD or more than 90% TD is formed. The SPS can be performed with the imposition of a controlled uniaxial pressure applied at the maximum temperature of the processing to achieve a very high density, in excess of 95% TD, at temperatures of 850 to 1600° C. The formation of a fuel pellet can be carried out in one hour or less. In an embodiment of the invention, a nuclear fuel pellet comprises UO₂ and a highly thermally conductive material, such as SiC or diamond.

Provided is a method for producing a fully dense rare earth-iron-based bonded magnet, the method comprising: kneading a non-tacky thermosetting resin composition with rare earth-iron-based magnet flakes to produce a solid granular composite magnetic material; filling the granular composite magnetic material into a cavity, applying a uniaxial pressure higher than or equal to the yield stress of the thermosetting resin composition to the granular composite magnetic material so as to produce a green compact in which voids are reduced as a result of an interaction between brittle fracture of the magnet flakes and plastic deformation of the thermosetting resin composition, the rare earth-iron-based magnet flakes are piled on top of one another highly compact in the direction of the pressure axis, and the mutual positional relations of the magnet flakes are set almost regularly; and heating the green compact to cure the thermosetting resin composition constituting the green compact.

The invention relates to a method for measuring rock thermal coefficient of linear expansion by utilizing a pressure tester. The method comprises the following steps of selecting a rock sample, drilling a circular hole and engraving a wire leading groove; installing a silica gel heating element heating device; wrapping a heat preservation and insulation layer; installing an electric couple; placing the assembled rock sample onto a uniaxial pressure tester, putting heat preservation and insulation mats on the top surface and the bottom surface of the rock sample; starting the uniaxial pressure tester to apply an initial load on the rock sample; setting finishing temperature required to be applied, recording a finishing load value and axis finishing temperature after a system is stabilized; finally, calculating the thermal coefficient of linear expansion. The invention utilizes the common pressure tester to measure the rock thermal coefficient of linear expansion, so that compared with other existing methods, the time required for single measuring can be well shortened, the problem of cooling of heating equipment does not need to be considered, the measurement of the next sample can be carried out directly, and high-efficient measurement of the rock thermal coefficient of linear expansion in engineering design is realized.

The invention discloses a preparation method of porous titanium and titanium alloy, comprising the following steps: uniformly mixing Ti metal powder and alloy powder, the mass percentage of Ti metal powder in the obtained mixed powder is 45%-95%, and the mass percentage of alloy powder The percentage is 55%~5%; put the obtained mixed powder into a graphite or silicon carbide mold, place it in a vacuum sintering furnace for sintering, the vacuum degree is 0.1~10Pa, the one-way pressure is 200~1000MPa, and the heating rate is 20~100℃/ min, sintering temperature 800-1400°C, sintering 10-60min, then cooling to room temperature with the furnace and taking it out to obtain the alloy green body; use the obtained alloy green body as an anode to electrochemically dissolve the alloy metal powder, dissolve the metal wire mold, and be porous titanium. The pores of the porous titanium obtained in the invention have uniform distribution of pores and controllable size arrangement, and can be applied to medical porous titanium and titanium alloy materials and titanium and titanium alloy filter core materials.

The invention discloses an automatic rotary uterine lifting device and a method thereof, comprising a swinging structure, a rotating structure, an airbag assembly, a height adjusting structure and a support structure. The swing structure comprises a swing uterus rod, a crown wheel, a swing uterus rod shaft, a spur gear, a spur gear shaft, a second coupling and a second motor, wherein the head of the swing uterus rod is connected with a lifting cup and an air bag assembly. The rotating structure includes a rotating rod, a uniaxial pressure sensor, a first electric machine and a first coupling.The height adjusting structure comprises a sliding table, a sliding rail, a rack, a handle fixture and a handle, wherein a first motor of the rotating structure is connected with the sliding table ofthe height adjusting structure. The feeding system comprises a support seat, a rail and a support frame. The execution structure of uterine lifter can swing properly, rotate 360 degrees and feed forward and backward, which can solve the problem of low efficiency of manual adjustment of uterine lever, waste of human resources and simplify the operation process.

The invention discloses a heating constant-temperature device for a high-temperature rock uniaxial compression test. The heating constant-temperature device comprises a heating constant-temperature unit, a force transmission unit, a protection unit and a monitoring unit. The heating constant-temperature unit, the force transmission unit and the monitoring unit are arranged in the protection unit;the monitoring unit can be in contact with a standard cylindrical rock test piece, the heating constant-temperature unit and the force transmission unit, the force transmission unit is connected witha press machine to apply pressure to the standard cylindrical rock test piece, the heating constant-temperature unit can wrap the standard cylindrical rock test piece, and the force transmission unitis further communicated with the protection unit to conduct cooling. The device can be used in cooperation with a uniaxial press to simulate the influence of different temperature environments on themechanical property of a rock test piece, and has the remarkable advantages of being easy to operate, easy to control and high in test efficiency, can effectively avoid test errors caused by hydraulicoil invasion and test element temperature rise, and can conveniently and accurately obtain basic mechanical parameters of high-temperature rock.

The invention discloses a machine tool-base joint surface contact stiffness calculation method in consideration of concrete asperity fracture. According to the method, a fracture phenomenon is thought to be generated when the asperity on the surface of the concrete suffers from large load, the originally-fractured asperity load is shouldered by other un-fractured asperities, fracture of an asperity continues to happen, and so on and so forth, a balance state is achieved. Firstly, according to a uniaxial pressure stress-strain curve of a corresponding concrete mark, the relationship between the concrete critical fracture stress and a critical fracture area of a single asperity is built, a critical deformation area value of the single asperity is acquired, and based on a fractal theory, the bearing forces of the concrete asperity in elasticity, plasticity and fracture deformation stages are solved respectively. A finite element method is adopted to extract the contact pressure of a sample joint surface under different pretightening forces, the concrete-steel joint surface contact stiffness is acquired and calculated on the basis, simulation analysis is carried out by using ANSYS, and an experiment is designed to verify a theoretical model.

The invention provides a method for preparing microcrystal materials from waste residues. The method includes steps of 1), mixing the quartz sand waste residues, the metallurgical ore residues, the tailing residues and the sludge incineration ash residues with one another according to a mass ratio of 1:1:1:1 to obtain mixtures; 2), heating the mixtures in a high-temperature smelting furnace, smelting the mixtures at the temperature of 1400-1600 DEG C for 3-4 h to obtain molten glass and then carrying out water quenching treatment on the molten glass to obtain base glass; 3), grinding the base glass until the size of the base glass is smaller than 80 meshes, pressing the base glass in uniform directions by the aid of a ceramic press machine under the uniaxial pressures of 100 MPa to obtain rectangular samples, carrying out heat treatment on the samples in a heat treatment furnace and polishing and cutting the samples to obtain microcrystal glass. The method for preparing the microcrystal materials from the waste residues has the advantages that the method is high in waste residue utilization rate, and the waste residue utilization rate can reach 60-70%.

The invention concerns a method of preparing compacts having a sintered density of above 7.3 g/cm3. This method comprises the steps of subjecting an annealed, water-atomised, essentially carbon free stainless steel powder, which in addition to iron, comprises at least 10% by weight of chromium, not more than 0.4%, preferably not more than 0.3% by weight of oxygen, not more than 0.05%, preferably not more than 0.02% and most preferably not more than 0.015% of carbon, not more than 0.5% by weight of Si and not more than 0.5% of impurities, to HVC compaction with an uniaxial pressure movement with a ram speed of at least 2 m/s, and sintering the green body.

Aiming at problems that zirconia ceramic sintering temperatures are high and densification is difficult to achieve, the invention provides a low-temperature cold-sintering preparation method of a zirconia ceramic setter plate. Nanometer partially stabled zirconia powder (3Y-PSZ) is adopted as raw material powder, water or an aqueous solution is adopted as a solvent, a 3Y-PSZ ceramic presintered compact is prepared at a presintering temperature lower than 200 DEG C under a high uniaxial pressure, and then dense zirconia ceramic (the efficiency of space filling of which is greater than 94.0%) is prepared at an extremely low sintering temperature (not more than 1100 DEG C) by adopting pressureless sintering, hot press sintering and hot isostatic pressing sintering processes respectively. The prepared zirconia ceramic has excellent mechanical properties and thermal shock resistance. The method is simple in process, environmentally friendly and extremely low in energy consumption, can be an ideal preparation method for the zirconia ceramic setter plate used for MnZn ferrite sintering, and has a wide industrial application prospect.

The invention discloses an experimental device for testing rock disturbance-delayed elasticity; the experimental device comprises a base assembly, a first partition plate is fixed on the top of the base assembly, the first partition plate is fixedly provided with a first vertical plate, a second vertical plate, a third vertical plate, a fourth vertical plate and a fifth vertical plate, and the tops of the first vertical plate, the second vertical plate, the third vertical plate, the fourth vertical plate and the fifth vertical plate are fixedly assembled with a second partition plate; two sixth vertical plates are fixed on the second partition plate, and a third partition plate is fixed on the top of the sixth vertical plate; the first vertical plate is fixedly assembled with the end of apressurized oil cylinder, the pressurized oil cylinder passes through the second vertical plate and is fixedly assembled with the second vertical plate; a pressurized telescopic shaft of the pressurized oil cylinder passes through the third vertical plate, and is fixedly assembled with pressure applying components, the pressure applying components are disposed on a loading component; the number ofthe pressure components is two, the pressure applying components are respectively distributed on both sides of the loading component, and one pressure applying component is fixedly assembled with oneend of the disturbance shaft of a disturbance component. The experimental device can detect a sample in the aspects of disturbance, relaxation, uniaxial pressure applying and delayed elasticity.

A method manufactures a metal alloy part by spark plasma sintering. The method includes the simultaneous application, inside a die, of a uniaxial pressure and of an electric current to a powder component material that has the following composition: 42 to 49% aluminum, 0.05 to 1.5% boron, at least 0.2% of at least one element selected from tungsten, rhenium and zirconium, optionally 0 to 5% of one or more elements selected from chromium, niobium, molybdenum, silicon and carbon, the balance being titanium and the total of the elements without aluminum and titanium being between 0.25 and 12%.

A mixed powder was prepared by weighing Yb₂O₃ and SrCO₃ in such a way that the molar ratio became 1:1. The resulting mixed powder was subjected to uniaxial pressure forming, so as to produce a disc-shaped compact. The compact was heat-treated in an air atmosphere, so that a complex oxide was synthesized. The resulting complex oxide was pulverized. After the pulverization, a slurry was taken out and was dried in a nitrogen gas stream, so as to produce a synthesized powder material. The resulting synthesized powder material was subjected to uniaxial pressure forming, so as to produce a disc-shaped compact. The resulting compact was fired by a hot-press method, so as to obtain a corrosion-resistant member for semiconductor manufacturing apparatus. The resulting corrosion-resistant member was made from a SrYb₂O₄.

A mold comprising a die, an upper punch, and a lower punch, the pressure surface of one or both of the upper and lower punches being shaped non-planar, a cavity being defined between the die and the lower punch, is combined with a feeder including a shooter provided with a main sieve at its lower end port, the main sieve having a sifting surface of substantially the same non-planar shape as the pressure surface. A rare earth sintered magnet is prepared by feeding an alloy powder into the cavity through the shooter and sieve while applying weak vibration and vertical reciprocation to the shooter, applying a uniaxial pressure to the alloy powder fill in the cavity under a magnetic field to form a precursor, and heat treating the precursor.

The application discloses a high flux test system for high-temperature gradient thermal deformation, and compared with the prior art, the system comprises a system frame; a resistance furnace mountedon the system frame; a pressure applying mechanism for applying a uniaxial pressure to the test workpiece in the resistance furnace; and a pressure detection mechanism is used for detecting the pressure borne by the test workpiece in the resistance furnace. Compared with the prior art, the high-flux testing system for high-temperature gradient thermal deformation provided by the invention can realize uniaxial stress compression of the samples with equal cross sections and variable cross sections and uniform distribution of the temperature field of the samples in the thermal compression process, prevent the lubricating antifriction layer from being influenced by whether the lubricating antifriction layer is conductive or not, and realize short-time quenching after high-temperature deformation.

A method for manufacturing untwinned YBCO film can include the initial the step of depositing YBCO film on a substrate having a first end and second end. A temperature gradient can be established from the first end to the second end, which can establish an oxygen gradient in the YBCO film. A uniaxial pressure can further be established the film, in the same direction as the temperature gradient, form the first end to the second end. When the uniaxial pressure is established simultaneously with the temperature gradient, the result can be an untwinned YBCO film.