1100 results about "Ti element" patented technology

The invention discloses a high-entropy nanoparticle catalytic material with a metal atom shell structure and a preparation method of the high-entropy nanoparticle catalytic material, and belongs to the technical field of preparation of catalytic materials. The preparation method comprises the following steps: dispersing a metal salt and a nanofiber precursor in an organic solvent, and carrying out electrostatic spinning to obtain a nanofiber membrane; and then calcining and pre-oxidizing the nanofiber membrane, and then carbonizing and calcining to obtain the nanofiber membrane. Wherein the selection principle of the metal salt is as follows: (n-1)-(n-2) metals are selected as an alloy substrate, and the sum of the mixing enthalpy of elements of the alloy substrate is not greater than-5kJ mol <-1 >; one or two metal elements serve as a precipitated phase, and the sum of the mixing enthalpy of the metal elements of the precipitated phase and the elements of the alloy substrate is larger than 20 kJ mol <-1 >; the high-entropy nanoparticle catalytic material obtained by the method shows relatively high catalytic activity and stability, and the method has wide universality.

The invention belongs to the technical field of preparation of hydrogen sulfide stress corrosion resistant oil well pipes, and relates to a 125ksi steel grade hydrogen sulfide stress corrosion resistant oil well pipe material suitable for a normal temperature environment containing 1MPa H2S and a preparation method of the 125ksi steel grade hydrogen sulfide stress corrosion resistant oil well pipe material. B, Ti, V and Nb elements are added, and the contents of Si, Mn and Ni elements, the Cr / Mo ratio and the sum of Nb, V and Ti in steel are controlled; the refined 100% sorbite structure, various compounds and microalloying are obtained through the processes of pure steel smelting, forging, controlled rolling and secondary heat treatment, so that high strength and high toughness in the 125 ksi range are obtained, and meanwhile the hydrogen sulfide corrosion resistance is high. The pipe product obtained by the process method disclosed by the invention has no corrosion cracking phenomenon after being subjected to a corrosion resistance test under the partial pressure of hydrogen sulfide of 1MPa.

A latent heat storage particle that comprises a core particle and a coating part covering at least a part of the surface of the core particle, wherein: the core particle is composed of an element selected from the group consisting of Al, Mg, Si, Ti, Fe, Ni, Cu, Zn, Sn, Sb, Ga, In, Bi, Pb and Cd or an alloy or a compound mainly composed of the same and has a melting point of 100° C. or higher; the coating part is composed of one or more selected from the group consisting of an element different from the component of the core particle, an alloy and an inorganic compound containing the element and a mixture thereof, which does not undergo a chemical reaction with the core particle in the temperature range of the operating temperature; and at least a part of the coating part is in a particulate shape.

The invention relates to a reticular biphase heterostructure cast high-entropy alloy as well as preparation and application thereof, and aims to solve the technical problems of high production cost and long period caused by dependence on introduction of high-cost elements or a complex process in the conventional high-entropy alloy. The CrFeNiAlSi series alloy is used as a matrix component, the alloy design is optimized by introducing the Ti element, and the CrFeNiAl0. 28Si0. 12-xTix as-cast high-entropy alloy is prepared by combining the vacuum arc melting and suction casting process. The mechanical property of the alloy is optimized by reasonably adding Ti into the CrFeNiAlSi alloy and regulating and controlling the content of Ti, meanwhile, the adverse effect brought by Ti is overcome or balanced, and the as-cast high-entropy alloy which has a heterogeneous phase structure between battens and has high strength and good plasticity is developed.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. Raw materials of the neodymium-iron-boron magnet comprise a neodymium-iron-boron magnet base body and slurry containing a heavy rare earth element RE '. The component composition of the neodymium iron boron magnet base body is REx (Fe < 100-a > Ma) < 100-x-y > By, wherein RE is at least two of La, Ce, Pr and Nd and certainly contains Pr, and the mass of Pr in RE accounts for 25%-35% of the total mass of RE; m is selected from at least one of Co, Cu, Al, Nb, Ti, Zr and Ga; a, x and y represent numerical values obtained by multiplying the weight percentage of each element by 100, 28.5 < = x < = 31, 0.85 < = y < = 1.02, and 1.9 < = a < = 4.4; rE'is at least one of Pr, Gd, Tb, Dy, Ho and Er. After raw materials are made into neodymium iron boron alloy powder, a neodymium iron boron magnet base body is obtained through magnetic field forming, sintering and aging treatment, then the surface of the magnet base body is coated with slurry, elements in the slurry permeate into the interior from the surface of a flaky magnet through grain boundary diffusion, and the neodymium iron boron magnet is obtained. The use of heavy rare earth elements can be reduced, and meanwhile, the magnetic performance of the magnet is improved.

Provided are an aluminum alloy and a preparation method therefor, a die casting, a welding assembly, and an electronic device. Based on the total weight of the aluminum alloy, the aluminum alloy comprises the following elements in percentages by weight: 0.01-15% of La; 0.01-15% of Ce; 0.3-3% of Fe; 0.3-3.0% of Mn; and 0.01%-0.5% of Zr. La and Ce content together total 3%-15%, and the balance is Al and inevitable impurities, the content of any individual impurity element among the inevitable impurities being less than or equal to 0.2%.

The invention discloses high magnetic induction oriented silicon steel and a production method. The high magnetic induction oriented silicon steel comprises the following components in percentage by weight: 0.032 to 0.065 percent of C, 2.58 to 4.02 percent of Si, 0.014 to 0.036 percent of Als, 0.021 to 0.043 percent of Mn, 0.0015 to 0.014 percent of Nb, 0.0015 to 0.0084 percent of B, 0.0037 to 0.0081 percent of N and 0.004 to 0.015 percent of S. A large amount of B element is added, a proper amount of BN and other congenital inhibitors can be provided, the situation that primary grains are too large is effectively avoided, meanwhile, boron oxide, boric acid and borate are added into the magnesium oxide additive, an acquired inhibitor can be generated with N, an AlN + BN double-inhibitor system is formed, and the stability of magnetic performance is guaranteed; and the temperature is kept at 910-1005 DEG C for 18-25 hours, so that B is fully diffused and forms a new BN inhibitor with N, and the stability of the magnetic performance is effectively improved.

The invention provides a high-dielectric low-loss X7P type dielectric ceramic material and a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the dielectric ceramic material is composed of a perovskite type compound as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing SiO2, a third auxiliary component containing an Mn element and a fourth auxiliary component containing a rare earth element R. According to the invention, barium titanate is doped and modified, so that the excellent performance of combining different compounds is realized, the dielectric constant and temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The invention discloses a low-temperature high-toughness austenitic stainless steel welding wire and a preparation method thereof, and relates to the technical field of welding materials, in particular to a welding wire with high-toughness mechanical properties of formed cladding metal in a low-temperature environment and a preparation method of the welding wire. The Ti element is introduced into the welding wire, the dosage relation of the Al element and the Ti element is controlled, and the mass ratio of Al to Ti is kept to be (5-10): 1; a proper amount of Al element can play a role in purifying a molten pool during welding work, a proper amount of Ti element can effectively stabilize an austenite phase, and therefore it is guaranteed that the welding wire has the basic welding capacity, and meanwhile after the welding wire is converted into cladding metal, the welding wire is not prone to deformation. The material characteristics and the like of the material can meet the use requirements at room temperature and ultralow temperature environment, that is, the material has and keeps good tensile property, impact property and the like, so that pipelines, containers and the like prepared from the material can be used for transmitting or loading special low-temperature materials such as liquid hydrogen, liquid helium and the like.

The invention provides high-strength and high-toughness steel based on laser rapid melting, and the alloy components of the high-strength and high-toughness steel comprise the following elements in percentage by mass: 0.1-0.3% of C, 0.1-2.6% of Mn, 0.1-1.5% of Ni, 0.1-4% of Mo, 1-4.5% of W, 0.1-1.2% of Si and the balance of Fe and inevitable impurity elements, in the impurity elements, P is less than or equal to 0.01%, and S is less than or equal to 0.02%; wherein the ratio of the sum of the mass percentages of Ni and Mn to the mass percentage of Si is not less than 1.572. Meanwhile, the invention further discloses an additive manufacturing method of the high-strength and high-toughness steel based on laser rapid melting. According to the high-strength and high-toughness steel, the influence of alloying elements on an Mf point and an Ac1 point is fully considered during design, it is ensured that all sedimentary structures are lath martensite, and the macrosegregation phenomenon in solidification structures is avoided through laser rapid melting; and then nanoscale film austenite is obtained on the two sides of the lath martensite through in-situ laser ultra-fast heat treatment or off-site infrared ultra-fast heat treatment, and the high yield strength of 1200 MPa and the ultrahigh Charpy V-shaped notch impact energy of 120 J are obtained.

The invention belongs to the technical field of solid hydrogen storage, and particularly relates to a Ti-Fe-Mn-Ce-Zr-based hydrogen storage alloy high in volume capacity and easy to activate and a preparation method of the Ti-Fe-Mn-Ce-Zr-based hydrogen storage alloy, the specific composition of the hydrogen storage alloy is Ti < 1 > Fe < 0.9 > Mn < 0.1 > Ce < x > Zr < y >, x is any one of 0.02, 0.04 and 0.06, and y is any one of 0.02 and 0.06. By optimizing alloy components, transition elements Mn and Zr and a rare earth element Ce are added into the AB type hydrogen storage alloy TiFe, the rare earth element Ce exists in the form of an independent phase, and the transition elements Zr and Mn partially replace elements on the A side and the B side respectively, so that second phases Ce, CeO and ZrMn2 appear in a TiFe matrix, and the activation performance of the Ti-Fe-based alloy is remarkably improved.

The invention discloses a titanium-based hydrogen storage alloy material and a preparation method and application thereof. The element composition of the titanium-based hydrogen storage alloy material is Ti < 0.890 > Zr < 0.110 > Cr < 0.900 > Mn < 0.800 > Fe < 0.175 > (VFe) < 0.125 > + x wt.% Ce, and x ranges from 0 to 5. The titanium-based hydrogen storage alloy material has the characteristics of being easy to activate and excellent in hydrogen absorption and desorption performance (suitable in hydrogen absorption and desorption platform pressure, small in platform lag, large in reversible hydrogen storage capacity and fast in hydrogen absorption and desorption dynamics), and can meet the application conditions of kilowatt-level fuel cells of heavy machinery; the practical application of the Ti-based AB2 type hydrogen storage alloy in the aspect of kilowatt-level fuel cells is favorably widened.

The invention provides a titanium alloy-based composite coating structure, a method for inhibiting upward dilution of Ti during cladding of a wear-resistant layer on the surface of a titanium alloy and application of the titanium alloy-based composite coating structure. The method comprises the steps that an aluminum bronze barrier layer is formed on a titanium alloy substrate, the phase structure of the aluminum bronze barrier layer comprises a Cu phase and a Cu2TiAl phase, the Cu phase and the Cu2TiAl phase are each of an FCC crystal structure, and the Cu2TiAl phase is formed by reacting Ti in the titanium alloy substrate with Cu and Al; the volume ratios of a Cu phase and a Cu2TiAl phase in the aluminum bronze barrier layer are 40%-45% and 55%-60% respectively; and forming the transition alloy wear-resistant layer on the titanium alloy substrate with the aluminum bronze barrier layer by adopting a laser cladding technology. The aluminum bronze barrier layer is arranged to reduce upward dilution of Ti elements in the cladding process of the transition alloy wear-resistant layer, generation of a large number of hard brittle phases is avoided, the difference between the wear-resistant layer and a titanium alloy matrix in the thermophysical property aspect is relieved, and coating cracking is reduced.

The invention discloses a chromium-free fingerprint-resistant coating agent for a galvanized steel sheet and a preparation method of the chromium-free fingerprint-resistant coating agent. The chromium-free fingerprint-resistant coating agent is prepared from the following elements in percentage by mass: 1%-5% of sodium molybdate or / and sodium tungstate, 0.5%-2% of a phytic acid-chitosan compound, 0.3%-1.0% of a chelating titanate coupling agent, 2%-5% of fluorosilane modified nano SiO2, 30%-55% of waterborne hyperbranched polyurethane resin, 0.5%-2% of oxidized polyethlene wax and the balance of deionized water. The chromium-free fingerprint-resistant coating agent disclosed by the invention has excellent fingerprint resistance, high adhesive force and environmental protection property, is free of white rust in neutral salt mist for 150 hours and red rust in neutral salt mist for 360 hours, the white rust area is less than 5%, the industrial requirements of galvanized steel sheet surface treatment are met, and the problem of environmental risk in the prior art is avoided by adopting the combination of bio-based corrosion inhibitors.

A Si alloy powder for a negative electrode, the Si alloy powder including: a Si phase; a SiX compound phase; and at least one selected from the group consisting of a SnY compound phase and a AlY compound phase, in which the element Y in the SnY compound phase and the AlY compound phase includes at least one element selected from the group consisting of Cu, Fe, Ni, Cr, Co, Mn, Zr, and Ti, the Si alloy powder has an average particle diameter of 30 μm or less, and an amount of the Si phase in an entire Si alloy is 30 mass % to 95 mass %.

The invention discloses a coating for improving the paint adhesion capability of a metal part of a distribution box, and the coating is prepared by the following steps: depositing a first oxide layer on the metal surface, the first oxide layer comprising Zn element and Ce element; a second oxide layer is deposited on the surface of the first oxide layer, the second oxide layer comprises a Zn element and a Ce element, and the molar ratios of the Zn element and the Ce element of the first oxide layer and the second oxide layer are different; a third oxide layer is deposited on the surface of the second oxide layer, and the third oxide layer comprises a Zn element and a Dy element; and a fourth oxide layer is deposited on the surface of the third oxide layer, the fourth oxide layer comprises a Zn element and a Dy element, and the molar ratios of the Zn element and the Dy element of the third oxide layer and the fourth oxide layer are different. The coating provided by the invention can improve the adhesive ability of the paint to a metal substrate.

The invention discloses a crack-free laser powder bed additive manufacturing method for gamma'reinforced nickel-based alloy, which comprises the following steps: firstly, preparing raw material alloy powder, and detecting the total content of Al and Ti elements in the alloy powder; then the powder is loaded into a forming bin, a layer of powder is quantitatively laid every time, a powder bed is scanned through laser, laser energy input and the scanning speed are controlled, the powder bed is rapidly melted and solidified, a layer of solid is formed, the layer height of the solid is 0.02-0.05 mm, and the higher the total content of Al and Ti elements in the alloy powder is, the smaller the layer height is; and after a layer of entity is formed, the forming substrate is controlled to descend by the height of a construction layer, a layer of powder is laid again, laser scanning is conducted again, and the steps are repeated till construction is completed. According to the method, a cooperative control strategy of thin-layer thermal control is adopted, nucleation and expansion of cracks are restrained by controlling the descending height of a formed substrate and controlling laser parameters, and the crack-free laser additive meeting the requirements is manufactured.

The invention provides a high-dielectric low-loss ceramic composition as well as a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the high-dielectric low-loss ceramic composition comprises a perovskite type compound serving as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing an Nb element, a third auxiliary component containing an Mn element, a fourth auxiliary component containing a rare earth element R, and a fifth auxiliary component containing SiO2. According to the present invention, the ratio of the main components to the auxiliary components is subjected to design optimization, the ratio of the Nb element in the second auxiliary component to the Mn element in the third auxiliary component is adjusted, and the material preparation process parameters are subjected to optimization control, such that the dielectric constant and the temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The invention discloses a method for preparing a high-strength heat-resistant die-casting Mg-Gd-Zr alloy by regulating physical parameters, and relates to the technical field of alloy die-casting processing. According to the method for researching and developing the die-casting high-strength heat-resistant Mg-Gd-Zr alloy by adjusting the Gd / Y ratio, the Zn / RE ratio and the Al content in the Mg-Gd-Zr alloy, the feasibility of the scheme is preliminarily verified through low-cost gravity casting starting from alloy component screening, a large number of elements beneficial for improving the fluidity of the alloy are screened in combination with thermodynamic calculation and dynamic calculation, and the high-strength heat-resistant Mg-Gd-Zr alloy is obtained. On the basis of keeping high strength, the die casting defects are reduced, the elongation of the alloy is improved, finally, the high-strength heat-resistant Mg-Gd-Zr alloy subjected to high-pressure die casting is successfully prepared, and the technology starts from the alloy, improves the alloy flowability, reduces the defects brought in the die casting process and improves the alloy performance.

The invention discloses a high-entropy alloy wear-resistant coating with a silicon-containing transition layer for improving the wettability of a copper surface and a laser cladding method, and relates to the technical field of alloy coatings. The method comprises the following steps: providing silicon-containing transition layer alloy powder and CoCrFeNiTi series high-entropy alloy powder; providing a copper base material, and cleaning the surface to be cladded of the copper base material; cladding silicon-containing transition layer alloy powder on the surface of the copper base material by adopting a laser cladding process under a protective atmosphere to form a silicon-containing transition layer; and under the protective atmosphere, CoCrFeNiTi series high-entropy alloy powder is cladded on the surface of the silicon-containing transition layer through a laser cladding process, and the high-entropy alloy wear-resistant coating is formed. According to the high-entropy alloy coating disclosed by the invention, the Si element in the transition layer can be subjected to interface reaction with a copper substrate to form a Cu-Si solid solution phase with low interface energy, so that the interface tension between copper and a subsequent cladding coating is remarkably reduced, and the wettability between the copper substrate and a coating material is fundamentally improved; the high-entropy alloy coating is successfully cladded on the copper surface with poor wettability.

The invention relates to the technical field of pipeline steel production, in particular to a steel plate for a seabed hydrogen transmission pipeline and a manufacturing method thereof, the steel plate comprises the following chemical components: 0.04%-0.06% of C, 0.15%-0.25% of Si, 1.05%-1.25% of Mn, 0.01%-0.03% of Ti, 0.02%-0.04% of Nb, 0.03%-0.05% of V, and the sum of Nb, V and Ti is 0.068%-0.105%; the steel comprises, by weight, 0.02-0.04% of Als, less than or equal to 0.012% of P, less than or equal to 0.003% of S and the balance Fe and impurities. The chemical component design of the steel plate is based on low C and low Mn, the strength of the material is ensured by microalloying of Nb, V and Ti elements, the content of harmful elements in the steel is strictly controlled, and the steel plate for the pipeline, the performance of which completely meets the service conditions of hydrogen transportation in the seabed environment, is obtained by matching with a corresponding production process.

The invention discloses an ultrahigh-temperature multi-element iridium alloy material and a preparation method thereof, and belongs to the technical field of alloy materials. The iridium alloy material comprises the following elements in percentage by mass: 53 to 58.5 percent of Ir, 40 percent of Ta, 0.5 to 2 percent of Y and 1 to 5 percent of Re. The preparation method of the iridium alloy material comprises the following steps: weighing Ir, Ta, Y and Re metal powder in proportion and uniformly mixing; blank pre-pressing treatment is conducted on the evenly-mixed metal powder, the metal powder is die-cast into a block, and a pressed blank is obtained; the pressed blank is smelted through an electric arc smelting method, and an iridium alloy crude product is obtained after smelting is finished; and the smelting is repeated for more than 7 times, so that the pressed blank is uniformly smelted, the content of each component reaches the standard, and the iridium alloy material is prepared. According to the iridium alloy material, through the synergistic effect of multiple elements and the preparation technology, the triple effects of structural distortion strengthening, high-temperature stability and oxidation film integrity are achieved. And due to the high mixed entropy, a similar high-entropy alloy structure is formed, the high-temperature oxidation resistance is remarkably improved, and the alloy is suitable for various ultra-high-temperature environments.

The invention discloses a preparation method of a multistage strengthened coating on the surface of zirconium alloy, a multilayer film with CrTaNbSiO multi-component oxide layers and CrAlTaNbSi multi-component metal layers distributed alternately is prepared on a Zry-4 substrate through a magnetron sputtering method, and the thickness of each layer is 0.8-1.2 microns. The CrAlTaNbSi layer provides plasticity and toughness buffering through a high-entropy effect; the CrTaNbSiO layer takes amorphous SiO2 as a matrix, and a CrTaO4 / CrNbO4 nanocrystalline phase is embedded, so that the cooperation of oxygen diffusion blocking and nanometer strengthening is realized, and relatively high hardness and wear resistance are provided; the Al element in the multi-component metal layer diffuses into the oxide layer under the specific oxygen partial pressure to form a continuous Al2O3 layer, diffusion of the element is further hindered, the interface self-strengthening effect is achieved, and the coating is prevented from being peeled off.

The invention discloses a Sr, La and Ti composite modified refined hypoeutectic aluminum-silicon alloy and a preparation method thereof, and relates to the technical field of metal materials. The preparation method comprises the following steps: S1, heating an aluminum-silicon alloy ingot until the aluminum-silicon alloy ingot is completely molten, and introducing argon for refining treatment to obtain alloy liquid; s2, a modifier containing Sr is added and stirred, then a modifier containing La is added and stirred, and finally a refiner containing Ti is added and stirred; and S3, the alloy liquid is cast, and an aluminum-silicon alloy casting is obtained. By means of Sr, La and Ti composite modification and refinement, eutectic silicon in the hypoeutectic aluminum-silicon alloy can be changed into a fine fiber shape from a thick sheet shape, the long modification effect is maintained, meanwhile, Sr air suction is avoided, and the pinhole defect of a casting is reduced. A compound formed by the added Ti element can serve as a nucleation mass point of alpha-Al to play a role in refining, a rare earth La compound separated out firstly in the solidification process can pin a grain boundary, and the mechanical property of the hypoeutectic aluminum-silicon alloy is further improved.

The invention discloses a high-temperature-resistant austenite heat-resistant casting alloy material and an application method thereof, and belongs to the technical field of austenite heat-resistant casting alloy materials. The alloy material comprises C, Si, Mn, Cr, Al, Nb, Ti, Zr, N, Mo, W, Y, Ni and Fe elements with specific mass percentage content. Wherein the mass percentage contents of the C, Cr, Al and Ti elements meet the condition that the value of f1 obtained by the calculation model 1 meets the condition that f1% is larger than or equal to 2%, and f1% represents the volume percentage content of an M23C6 precipitated phase of the alloy material at the application temperature of 1100 DEG C or above. The alloy material obtained by the invention has remarkable high-temperature creep resistance in an extreme high-temperature environment, has a stable and compact oxidation film and reinforced carbide, and can keep excellent structural stability and high-temperature mechanical properties under a long-term service condition.

The application discloses a composite precipitation strengthening type high-entropy alloy and a preparation method thereof, and belongs to the field of metal material preparation. The high-entropy alloy is composed of Al, Co, Cr, Fe, Ni, Cu, V and Ti elements, and a general formula thereof is Al a Co b Cr c Fe d Ni e Cu f V g Ti h , wherein 2 <= a <= 4, 16 <= b <= 20, 16 <= c <= 20, 16 <= d <= 20, 35 <= e <= 40, 0 <= f <= 3, 0 <= g <= 3, 0 <= h <= 3, and a + b + c + d + e + f + g + h = 100. The high-entropy alloy is prepared through vacuum arc melting and heat treatment, and has excellent mechanical properties. The various metal raw materials used are environment-friendly, the preparation process is relatively safe, and the high-entropy alloy can be industrially produced.

This α+β type titanium alloy comprises 4.00-5.50% of Al, 1.40-4.50% of one or both of Fe and Cr, 1.50-5.00% of Mo, 0-4.00% of V, 0.05-0.25% of O, less than 0.10% of Si, less than 0.010% of C, and Ti and impurities as the remainder, wherein: included in the structure are a granular α phase having an aspect ratio of 8 or less and a mixed structure including a needle-like α phase and a β phase; the maximum width of the needle-like α phase is 0.01-5.00 μm; and, where the element having the higher content between Fe and Cr is element M, the concentration distribution of element M in the mixed structure satisfies formula (1).　Formula 1: (A - B) × C / D ≥ 0.160

The invention discloses a CuCr contact and a preparation method thereof, and belongs to the field of alloy contact manufacturing, the CuCr contact is divided into an arc contact area, a transition area and a conductive connection area, and the Cr content of each area is in gradient distribution and is sequentially reduced, so that interface stress concentration can be avoided, and the structural compatibility and mechanical reliability of the whole contact are improved; meanwhile, integrated forming is achieved through the 3D printing technology, the size and the component boundary of each area can be accurately controlled, the complex structure design requirement of the contact is met, and the problems that in the prior art, performance gradient cannot be achieved according to the function requirements of different parts of the contact, and the material utilization rate is low are solved; the printed contact does not have the phenomena of composition segregation, agglomeration, uneven pores and the like, and the problems that in the prior art, Cr elements are difficult to distribute uniformly in a Cu matrix, Cr particles are prone to segregation and agglomeration, local ablation resistance is insufficient, and burning resistance is low are solved.

The invention discloses a high-strength and high-plasticity copper alloy and a preparation method thereof. The high-strength and high-plasticity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-150): 1, wherein the Cu-Al pre-alloyed spherical powder and the CuO powder are different in particle size range. The solid solution state Al element part in the high-strength plastic copper alloy is oxidized into Al2O3 through CuO, and the Al2O3 exists in a Cu matrix. The preparation method comprises the following steps: (1) mixing Cu-Al pre-alloyed spherical powder with CuO powder, and drying; (2) cold isostatic pressing treatment; (3) vacuumizing, sintering at a high temperature in a protective atmosphere, and cooling; (4) vacuumizing, reducing in a reducing atmosphere, and cooling; and (5) after preheating, the copper alloy reduction blank is placed in a rotary forging die, rotary forging and air cooling are conducted, and the copper alloy is obtained. The high-strength plastic copper alloy is good in conductivity and mechanical property and high in plasticity. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

The invention relates to a Ti element doped high-performance high-temperature samarium cobalt permanent magnet material and a preparation method thereof, and belongs to the field of rare earth permanent magnet materials. Elements of Sm, Co, Fe, Cu, Zr and Ti with the purity higher than 99.9% are uniformly mixed and smelted into an original cast ingot, a powder metallurgy preparation technology is adopted, the cast ingot is ground into alloy powder, and the samarium-cobalt permanent magnet material is prepared through orientation compression, isostatic pressing, high-temperature sintering, solid solution and isothermal aging heat treatment processes. According to the invention, by doping the Ti element, the grain size is increased, the grain boundary impurity phase precipitation is inhibited, and the thickness and the content of the flaky phase are properly reduced, so that the number of reverse magnetization nucleation sites is reduced, and the magnetic properties such as the coercive force and the maximum magnetic energy product of the magnet are effectively improved.