39results about How to "Large lattice distortion" patented technology

The invention relates to a preparation method for high-entropy alloy coating, and belongs to the technical field of alloy coating preparation. The preparation method comprises the following steps: placing high-entropy alloy powder presenting a single face-centered cubic structure on the surface of a steel base material; sintering by utilizing a vacuum hotpressing sintering furnace: firstly, adjusting the vacuum degree of a furnace chamber to be 1.0*10<-3> Pa, then rising the temperature to 800-1,000 DEG C with the temperature rising speed of 5-10 K/min, controlling the sintering pressure to be 20-40 Mpa, and sintering for 30-90 min. According to the preparation method, the high-entropy alloy powder presenting the single face-centered cubic structure is used as a raw material, the manner of vacuum hotpressing sintering which is simple in operation and common in used equipment is adopted for the first time to prepare the excellent high-entropy alloy coating; through control of the sintering process, the prepared CoCrFeNi coating still keeps the single face-centered cubic structure, and the hardness and the wear resistance of the coating are obviously improved.

The invention relates to a 3D printing process method of a high-strength aluminum manganese alloy, and belongs to the technical field of 3D printing. The 3D printing process method comprises the stepsthat firstly, a high-strength aluminum manganese alloy is mixed evenly by heating and melting; then the melted high-strength aluminum manganese alloy is subjected to a gas atomization technology to prepare high-quality aluminum manganese alloy powder, and aluminum manganese alloy powder for 3D printing is obtained after drying; and printing parameters are adjusted, 3D printing is conducted according to three-dimensional model data of parts in printing equipment introduced with inert gas, and a 3D printing product with the high-strength aluminum manganese alloy as a raw material is obtained. Compared with the prior art, according to the product printed by the process method, the relative density can reach more than 99%, the Vickers hardness can reach more than 140 HV, the tensile strengthcan reach more than 440 MPa, the elongation can reach 20%, after proper hear treatment, the hardness of a sample can reach more than 180 HV, the tensile strength can be further increased to more than565 MPa, and the elongation is maintained at or above 19%.

The invention discloses a rare earth catalytic permeation QPQ composition and a method for manufacturing a high-speed cutting tool by a QPQ process, and belongs to the metal surface treatment technology. A nitriding speed of a conventional QPQ process is relatively slow, the thickness of a nitrided layer formed on the surface of a metal is relatively small, the hardness of a corresponding depth is also relatively smaller, and the grain size of the nitrided layer is relatively low; the rare earth catalytic permeation QPQ composition contains a QPQ base salt, and a salt solution of the QPQ base salt contains CNO<->; the composition contains a rare earth compound as a catalytic permeation agent; the rare earth compound is a solid mixture of La carbonate and Ce carbonate according to the weight ratio of 1:3 to 3:1. The method comprises that the rare earth catalytic permeation QPQ composition is melted into a liquid state to become the salt solution, and a workpiece is immersed into the salt solution for nitridation. Compared with a conventional QPQ salt, the permeation rate is increased; the formed compound layer is 10 [mu]m or more deeper than a conventional QPQ compound layer, and the hardness of the corresponding depth is increased by 100 HV or more; the structure of the nitrided layer is increased by 1 grain size grade.

The invention discloses a Zr-Ti-Cr-V complex phase hydrogen storage alloy and a preparing method thereof. The hydrogen storage alloy is composed of Zr, Ti, Cr and V; the atomic ratio is 1:0.2-0.6:0.1-0.6:1.8-2.1. Through component design of the non-stoichiometric ratio, through vacuum heat treatment, a C15 type Laves phase, V-rich solid solution and Zr-rich solid solution coexistence complex phasestructure with the specific proportion can be formed in the alloy. The alloy room temperature hydrogen absorbing amount can reach 2.80wt%, and the excellent hydrogen absorbing dynamics property can be achieved.

The invention discloses a method of regulating performance of a CoCrFeNiCu high-entropy alloy. The method is characterized by comprising the following steps: smelting raw materials Co, Cr, Fe, Ni andCu in equal molar weight with elements in a crucible by means of a smelting method, and smelting the melt at a high temperature continuously for no less than 10min; stretching a pulse electrode into the melt stopped in heating, and processing the pulse electrode for 30-90s with pulse, the voltage of which is not smaller than 100V and the frequency of which is not smaller than 5Hz, to obtain a CoCrFeNiCu high-entropy alloy; and naturally cooling the CoCrFeNiCu high-entropy alloy to room temperature and taking out a cast ingot from the crucible to obtain a CoCrFeNiCu high-entropy alloy cast ingot. According to the method disclosed by the invention, an electric pulse treatment method is applied to a preparation process of the high-entropy alloy to prepare the high hardness and high strength alloy, the yield strength of which is improved by about 233.3% and the breaking strength of which is improved by about 18.4%; and meanwhile, the invention provides a regulating method which is small inenergy consumption, low in cost, simple to operate or short in treatment period and can regulate the performance of the alloy.

The invention discloses a powder material with high infrared radiance in a broadband and the preparation method of the powder material. The powder material is of a cordierite material doped with Ba<2+> or/and Fe<3+>. The preparation method of the powder material comprises the steps of: firstly dissolving pioneer raw materials and doped raw materials which form the cordierite into an alcohol-water mixture solvent, stirring, drying, and then prefiring at the temperature of 600-1,000 DEG C under air atmosphere; and forging at the temperature of 1,150-1,350 DEG C; and finally cooling to room temperature along with a furnace. The powder material disclosed by the invention has radiance higher than 0.8 in the infrared waveband of 5-24mu m when being heated to 100 DEG C, especially, the most of infrared radiance is higher than 0.9 in the waveband of 14-20mu m and obviously higher than that of cordierite matrix, thus meeting application requirements in the fields of infrared interior wall insulating coating, infrared ceramic glazed bricks, industrial furance insulating coating and the like.

The invention provides a silicon-containing high-entropy alloy coating and a preparation method thereof, and belongs to the field of alloy coatings. According to the silicon-containing high-entropy alloy coating and the preparation method thereof, a silicon element is used as a secondary element and also is a gap element to be added into CoCrCuFeMn high-entropy alloy so that the quite good high-temperature softening resistance can be achieved through a gap effect of non-metal elements, then the lattice distortion of the high-entropy alloy of the kind can be increased, a solid solution strengthening effect can be achieved, the silicon element and the main element can also form a silicide to be dispersed in the alloy structure, a dispersion strengthening effect is generated, so that the hardness and the wear resistance of the high-entropy alloy of the kind are improved; the self-fluxing element Si is added so that the fluidity of the alloy in the liquid state can be improved, and then the macroscopic morphology of the surface of the coating is improved; and part of the Si can replace Cr with the large atom radius, so that the lattice distortion effect of the alloy is intensified, then the peak value of the FCC phase in the high-entropy alloy structure is changed, through the addition of the Si, the BCC phase can be converted to the FCC phase in the high-entropy alloy, so that thevolume fraction of the FCC phase is promoted to be increased.

The invention provides a carbonic high-entropy alloy coating and a preparation method thereof, and belongs to the field of alloy coatings. Co, Cr, Cu, Fe and Mn are adopted as main elements, a carbon element (C) is adopted as a secondary element, C is an interval element and is added into the CoCrCuFeMn high-entropy alloy, the stacking fault energy of the alloy can be improved through the interval effect of the non-metal element, lattice distortion of the high-entropy alloy is improved, the solid solution strengthening effect is achieved, the carbon element can form a carbide with the main elements, for example, Fe-C, Cr-C M23C6 or M7C3 carbides are formed and dispersed into alloy tissue, the dispersion reinforcing effect is generated, and the high-entropy alloy hardness and abrasion resistance are improved; meanwhile, the high-entropy alloy structure formed by the main elements is BCC+FCC, a dual-phase solid solution is formed, after the C element is added, and the phase structure type cannot change; due to the dual-phase solid solution, the high-entropy alloy has the higher strength, and the hardness of the carbonic high-entropy alloy coating is improved.

The invention relates to a composite pretreatment process for improving ion nitriding efficiency. The process comprises the following steps: original-state steel is machined and cut as a sample; the sample is thermally refined and polished for ultrasonic cleaning in organic solvent and drying; the sample is impacted by laser, and is positioned in an ion nitriding furnace for vacuumizing; hydrogenis introduced for sputtering; preoxidation and ion nitriding are performed in succession; and the sample is cooled to the room temperature along with the furnace. The process has the following beneficial effects: through the first phase of laser impact, grains on the surface layer of a material are refined, the dislocation density is increased, and an ideal channel is provided for dispersion of nitrogen atoms; in the second phase, a thin layer of oxide film is formed on the surface of the material, and the oxide film is gradually reduced by hydrogen in the ion nitriding process to form a looseporous dispersion channel, so that the catalytic permeation effect is further achieved; and through laser impact and pre-oxidation compound pretreatment, the nitriding efficiency and the permeation layer thickness can be greatly improved within shorter time, so that prominent efficiency and energy saving advantages are achieved.

The invention provides best strain of an austenitic stainless steel container welding residual stress overload reducing method. The best strain of the austenitic stainless steel container welding residual stress overload reducing method comprises: (1) a best value exists in overload dependent variable for reducing welding residual stress, the dependent variable corresponding to first major principal stress in direction in a continuous structure zone serves as an evaluation index and overload plastic strain is in a range of 2%-5%; (2) in the process of overload, boosting speed is controlled through a variable frequency pump or an automatic control reflux valve, uploading speed is in a range of 0.2 MPa/min-0.4 MPa/min and the dependent variable is controlled through deformation measurement or strain measurement; and (3) when a container is manufactured, a tensile test is firstly performed to materials, design stress and overload stress are determined according to an actual single tensile curve of the materials and design pressure and overload pressure are calculated through a simplified method. Numerical modeling has universality and generality, evaluation stress is corroded, first tensile welding residual stress is reduced to a great extent and the residual stress after reduction is in the same level with residual stress of a cold rolling plate rear base material and residual stress after stress relief heat treatment.

The invention relates to a chip-type intelligent pyroelectric infrared sensor, which is a closed structure shell composed of a tube cap and a substrate. The upper surface of the tube cap has a window, and an infrared optical filter is embedded on the window; and the tube cap and the A receiving space is formed between the substrates, and the receiving space accommodates and encapsulates the infrared sensitive element, the supporting component and the signal processing module; the infrared sensitive element is fixed by the supporting component, and the supporting component and the signal processing module are directly fixed on the substrate. The pyroelectric infrared sensor of the present invention has the characteristics of miniaturization, intelligence, and the ability to output multiple control signals. This packaging structure is suitable for SMT automatic patch and reflow soldering processes, which is conducive to mass automatic production and improves manufacturing efficiency. Reduce manufacturing costs.

The present invention discloses a tellurium-doped MXene composite material and a preparation method thereof, comprising the following steps: (1) adding MXene and a tellurium source into a dispersant to prepare a dispersion, and then stirring the dispersion; (2) heating the dispersion, reacting, and then cooling; (3) centrifuging the product obtained in the step (2), then washing and drying under vacuum; and (4) placing the dry product obtained in the step (3) into a corundum ark, and then transferring into a tubular furnace, heating under the protection of inert gas, retaining the temperature, and then cooling to obtain the tellurium-doped MXene composite material. The composite material prepared by the present invention can be used as a cathode of a potassium ion battery, which increases the interlamellar spacing, and optimizes an ion diffusion channel, so that the electrochemical performance of the potassium ion battery is improved.

A thermoelectric device includes a semiconductor stacked thin film including a SiGe layer and a Si layer in contact with the SiGe layer. The SiGe has a Si:Ge composition ratio by atomic number ratio within a range of 85:15 to 63:37. The stacked thin film has a plurality of stacked structures each having the SiGe layer and the Si layer.

The invention relates to high-entropy alloy powder, a high-resistance coating, as well as a preparation method and application thereof. The high-entropy alloy powder is prepared from the following components in percentage by mass: 17 to 25 percent of nickel, 14 to 25 percent of cobalt, 15 to 20 percent of chromium, 13 to 20 percent of manganese, and the balance iron. The high-entropy alloy powderis applied to the preparation of the high-resistance heating coating. According to the high-resistance coating material provided by the invention, the coating obtains a single-phase structure, the resistance of the coating is improved at the same time, the heating efficiency is improved, and the service reliability is ensured at the same time, so that the high-entropy alloy powder and the high-resistance coating have broad application prospects.

The invention provides a high-strength creep-resistant high-temperature alloy and a preparation method thereof, and belongs to the technical field of metallurgy. The alloy comprises the following components in percentage by mass: 10.00%-12.00% of Cr, 12.00%-18.00% of Co, 5.50%-7.50% of W, 1.50%-3.50% of Mo, 3.00%-4.20% of Al, 3.00%-4.20% of Ti, 1.00%-2.20% of Nb, 0.40%-1.50% of Ta, 0.01%-0.04% of C, 0.01%-0.04% of B, 0.09%-1.20% of Zr, less than 0.10% of Hf and the balance of Ni, and the total mass percentage of gamma'phase forming elements Al, Ti, Nb and Ta in the high-temperature alloy is as follows: 9.5% < = (Al + Ti + Nb + Ta) < = 10.3%; the mass percentage content of a gamma'phase in the high-temperature alloy is 50%-55%, and the mass ratio of Al to Ti in the high-temperature alloy is that (Al/Ti) is larger than or equal to 0.9 and smaller than or equal to 1.0. The alloy and the disc piece of the alloy can be manufactured through the method, and the disc piece of the alloy can meet the requirements of future aviation turboshaft engines for high temperature resistance, high strength and creep resistance.

The invention provides a high-hardness Al-Cr-Ti-V-Cu light high-entropy alloy and a preparation method thereof, and belongs to the field of metal materials and preparation. The high-entropy alloy mainly comprises the following components in percentage by atoms: 20 to 25 percent of Al, 20 to 25 percent of Cr, 20 to 25 percent of Ti, 20 to 25 percent of V and 0 to 20 percent of Cu, wherein the content of Cu is not 0. The phase structure of the alloy is mainly characterized in that a single-phase structure is gradually converted into a multi-phase structure, a single BCC phase structure is mainly and gradually converted into a BCC+FCC phase and a small amount of HCP phase structure, and finally the structure is converted into an FCC+HCP phase structure. The high hardness of 650 HV or above and good thermal stability are shown. The invention further provides a preparation method of the Al-Cr-Ti-V-Cu high-entropy alloy. Vacuum arc melting and direct casting are performed to obtain an alloy ingot; and the preparation process is pollution-free, low in energy consumption and low in cost.

A kind of nanoscale powder Mg ₂ The preparation method of Ni compound belongs to the field of material preparation technology, and the magnesium-nickel alloy is processed by the severe plastic deformation technology, so that the microstructure is fully refined, and the Mg ₂ The size of the Ni phase is reduced to the nanoscale, and then the magnesium in the matrix is ​​corroded, and the corrosion product is filtered and dried to obtain nanoscale powder Mg with uniform particle size ₂ Ni. The process of the present invention is simple and reliable, and the cost is low, and the obtained nano-scale powder Mg ₂ Ni has a size comparable to that of the nodular method, and Mg ₂ Ni crystals retain a large dislocation density and lattice distortion, which greatly improves its hydrogen storage performance.