108 results about "Cu element" patented technology

The application belongs to the technical field of magnesium alloy and provides a low anisotropy magnesium alloy, which comprises the following raw materials in percentage by mass: Gd 5.80-7.20 wt%, Y 0.02-2.00 wt%, Zr 0.30-0.60 wt%, Zn 0-0.60 wt%, Mn 0-0.10 wt%, Sb 0.02-0.3 wt%, Sr 0.02-0.05 wt%, Sn 0.04-0.1 wt%, and the balance being magnesium. The application also provides a method for preparing large structural parts in a short process. The application utilizes the atomic misplacement and the difference in elastic modulus between the matrix and the Gd and Y elements to improve the mechanical properties, thereby ensuring the basic performance indicators of the alloy system, and utilizes the combined action of rare earth elements and precise control of the forming process to realize the short process preparation of large structural parts.

The present invention relates to the technical field of other processing of metals. Disclosed are a free-machining titanium material and a preparation process therefor. The free-machining titanium material comprises: a matrix component group and free-machining component groups, wherein at least one of the free-machining component groups is added to the matrix component group; the matrix component group comprises the following components in percentage by mass: 0-1.0% of Fe, 0-0.08% of N, 0-0.02% of H, 0-0.50% of O, 0-8.0% of Al, 0-15.0% of V, and the balance being titanium and inevitable impurities; and the free-machining component groups are an RE element and S element group, a Cu element and S element group, a Zr element group, a C element group, a B element group, and an Mg element group, respectively. The preparation process involves producing the described free-machining titanium material by using any one of the following three methods: vacuum arc remelting, vacuum floating melting, and powder metallurgy. The present invention solves the technical problem of how to further improve the machinability of titanium materials.

The invention relates to the technical field of electronic packaging and welding, and particularly discloses Ag-Cu-Ti-based composite brazing filler metal and a preparation method and application thereof. The composite material comprises the following components in percentage by weight: 87%-96.5% of Ag-Cu28 alloy powder, 3%-8% of TiH2 and 0.5%-5% of a reinforcing phase, and the reinforcing phase is Ag-coated titanide or ceramic particles. According to the method, the comprehensive welding performance of the brazing filler metal is improved by adopting a method of coating the reinforcing phase with Ag, and meanwhile, the negative influence caused by adding the reinforcing phase is overcome. Aggregation of reinforced phase particles can be reduced through Ag coating, uniform distribution of the reinforced phase fine particles in the brazing filler metal is achieved, and generation of large brittle phases is greatly reduced. And meanwhile, the fluidity of the brazing filler metal is enhanced, the joint filling capacity of the brazing filler metal is improved, and the welding voidage of a connector is effectively reduced. In addition, the Ag coating can avoid the reaction between the reinforcing phase and the Ti element, and the influence of the reinforcing phase on the melting point of the brazing filler metal is reduced.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength corrosion-resistant heat-treatment-free die-casting aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 5.5%-7.1% of Mg, 2.5%-3.5% of Si, 0.5%-0.75% of Mn, 0.11%-0.7% of Cu, 0.08%-0.15% of Fe, 0.05%-0.1% of Mo, 0.02%-0.05% of V, 0.01%-0.05% of Zr, 0.03%-0.09% of Y and the balance Al and inevitable impurity elements, the content of a single impurity element is smaller than or equal to 0.02%, and the total content of the impurity elements is smaller than or equal to 0.2%. And the mass ratio of the Mg element to the Cu element in the aluminum alloy components is in the range of (10: 1)-(50: 1). The heat-treatment-free die-casting aluminum alloy provided by the invention is high in yield strength and obvious in weight reduction effect.

The invention provides a low-carbon high-conductivity aluminum alloy rod and a preparation method thereof, and aims to solve the technical problems that the conductivity of an aluminum alloy material which depends on a Cu element to improve the strength is suddenly reduced, and a pure aluminum wire cannot bear the mechanical load of large-span power transmission. The low-carbon and high-conductivity aluminum alloy rod comprises 0.5-0.8 wt% of Mg, 0.4-0.6 wt% of Si, less than or equal to 0.3 wt% of Cu, 0.05-0.15 wt% of mixed rare earth elements, 0.03-0.1 wt% of Sc, less than or equal to 0.1 wt% of Fe and Clt. 0.01 wt% of the total weight; the mixed rare earth elements are La and Ce, and the ratio of La to Ce is (2: 1)-(1: 2); and the balance of Al and inevitable impurities. The content of the Cu element is reduced, the damage of theta to the electric conductivity is reduced, rare earth is added and mixed, the impurity Fe is inhibited from forming an AlFe brittle phase, the grain boundary is purified, the electric conductivity is improved, Sc is added, an AlSc nano precipitated phase is formed, pinning dislocation and the grain boundary are formed, and the strength is improved.

The invention provides a Cu-Ti alloy and a preparation method thereof. The Cu-Ti alloy comprises the following components in percentage by mass: 3.0-3.5 wt% of Ti element, less than or equal to 0.05 wt% of B element, less than or equal to 0.05 wt% of Zr element and the balance of Cu element, the Cu-Ti alloy comprises a beta '-Cu4Ti precipitation phase with the size being 3 nm to 7 nm, a beta'-Cu4Ti precipitation phase with the size being 8 nm to 12 nm and a beta '-Cu4Ti precipitation phase with the size being 13 nm to 20 nm. The precipitated phases comprise microstructures with the size ranges of 3-7 nm, 8-12 nm and 13-20 nm, the microstructures jointly act on an alloy matrix, the strength, plasticity and conductivity of the Cu-Ti alloy material are remarkably improved, and therefore the problem that the Cu-Ti alloy material is difficult to give consideration to excellent strength, conductivity and plasticity at the same time is solved.

The invention relates to the technical field of aluminum alloy materials and casting, and provides an aluminum alloy for liquid die forging, a preparation method of the aluminum alloy and liquid die forging workpiece manufacturing application, and the aluminum alloy for liquid die forging comprises, by mass, 6.0%-10.0% of Si, 0.3%-1.0% of Mg, 0.05%-0.8% of Mn, 0.05%-0.6% of Cr, 0.005%-0.05% of Ga, 0.01%-0.2% of Hf, 0.01%-0.2% of W, 0.03%-0.4% of Y, 0.03%-0.4% of Nd, 0.03%-0.4% of Er and the balance aluminum. The aluminum alloy comprises the following components in percentage by weight: less than or equal to 1.0% of Fe, less than or equal to 0.25% of Hf and W elements, 0.2-0.8% of Y, Nd and Er elements, less than or equal to 0.03% of other inevitable single impurity elements, less than or equal to 0.15% of impurity elements and the balance of aluminum. The aluminum alloy for liquid die forging effectively solves the problems that the formability and the mechanical property of an existing material are difficult to consider at the same time and the cost controllability is poor, and has remarkable comprehensive advantages.

The invention provides a method for testing the copper diffusion depth of an aluminum alloy clad aluminum plate. The method comprises the following steps: pretreating the aluminum alloy clad aluminum plate; and carrying out line scanning on the pretreated aluminum alloy clad aluminum plate by utilizing an energy disperse spectroscopy, and obtaining the copper diffusion depth of the aluminum alloy clad aluminum plate according to an obtained Cu element curve. According to the test method provided by the invention, the concentration distribution gradient of the Cu element in the coating layer of the aluminum alloy coated aluminum plate is reflected by utilizing energy disperse spectroscopy line scanning, the influence caused by test operations such as etching is avoided, the copper diffusion depth of the coating layer can be truly reflected, and the accuracy of copper diffusion depth data is ensured.

The invention provides a synergistically modified Cu-Ti alloy and a preparation method thereof. The synergistic modified Cu-Ti alloy comprises the following components in percentage by mass: 3.0-3.5 wt% of a Ti element, less than or equal to 0.01 wt% of a B element, less than or equal to 0.01 wt% of a Zr element and the balance of a Cu element, wherein the synergistic modified Cu-Ti alloy comprises a beta '-Cu4Ti precipitated phase with the size of 3 to 5 nm, a beta'-Cu4Ti precipitated phase with the size of 6 to 15 nm and a beta '-Cu4Ti precipitated phase with the size of 16 to 26 nm. The multi-scale precipitation phases jointly act on an alloy matrix, so that the strength, plasticity and conductivity of the synergistically modified Cu-Ti alloy material are remarkably improved.

The application relates to a feed for metal injection molding, a preparation method of the feed and a metal product, wherein the preparation method of the feed comprises the following steps: S1, obtaining the following components according to weight parts: 40-50 parts of Fe elements, 2-8 parts of Ni elements, 20-25 parts of Cr elements, 20-25 parts of Co elements, 2-8 parts of Mo elements, 2-8 parts of Cu elements, 0.1-3 parts of Si elements, 1-3 parts of Mn elements, mixing and then heating to melt the material, and then adopting a high-pressure water-gas combined atomization method to obtain mixed powder; S2, obtaining a forming agent; S3, preheating the mixed powder obtained in S1 under vacuum conditions, then adding the forming agent into the mixed powder for mixing, and then performing plasticizing extrusion granulation to prepare the feed. The feed can meet the size precision requirements of MIM injection, green compact degreasing sintering and related post-process machining, the existing MIM materials on the market cannot simultaneously meet the problem of high polishable hardness, and the obtained metal product has the comprehensive advantages of appearance and hardness.

The invention belongs to the technical field of superconducting materials, and particularly relates to a functional gradient barrier layer and application thereof. Chemical components of the functional gradient barrier layer change in a gradient mode in the thickness direction of the functional gradient barrier layer, the functional gradient barrier layer is a Nb-rich element area close to one side area of the NbTi superconducting core wire, and the atomic percent of Nb elements is larger than or equal to 90%; in a region close to one side of the Cu substrate, the functional gradient barrier layer is a Cu element-rich region or a Cu element-containing alloy region, and the atomic percent of the Cu element is greater than or equal to 95%; and a gradient layer with continuous transition of chemical components is arranged between the Nb-element-rich region and the Cu-element-rich region or the Cu-element-containing alloy region.

The application provides a copper alloy, a preparation method thereof and an elastic electronic component, and relates to the technical field of copper alloys.The copper alloy comprises the following elements in percentage by mass: the content of Ti element is 2.70-4.20%, the content of Y element is 0.010-0.030%, the content of La element is 0.010-0.030%, the content of B element is 0.010-0.020%, the total content of unavoidable impurities is less than or equal to 0.01%, and the balance is Cu element and M element; wherein, the M element is Fe element or P element, when the M element is Fe element, the content of Fe element is 0.28-0.45%, and when the M element is P element, the content of P element is 0.05-0.15%. The copper alloy has excellent tensile strength, hardness, elastic modulus and conductivity.

The invention discloses a surface hardening steel with uniformly distributed hardness of a hardening layer, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.34 to 0.42 percent of C, 0.1 to 0.4 percent of Si, 0.7 to 1.4 percent of Mn, 0.02 to 0.25 percent of Cr, 0.02 to 0.15 percent of Mo, 0.015 to 0.05 percent of Al, 0.001 to 0.0035 percent of B, 0.02 to 0.06 percent of Ti, 0.01 to 0.035 percent of S, 0.003 to 0.008 percent of N and the balance of Fe. And no Cu element is contained. The invention further discloses a manufacturing method of the steel. The manufacturing method comprises the following steps: smelting and casting; heating and rolling; normalizing after rolling; surface quenching and low-temperature tempering are carried out, wherein the surface quenching temperature is 830-950 DEG C; and the low-temperature tempering temperature is 150-250 DEG C, and the heat preservation time is 1-3 h.

The invention discloses a design method and application of a high-toughness Al-Cu series cast aluminum alloy, and relates to the technical field of cast aluminum alloys, the design method comprises the steps that alloy components are limited, and a variable temperature aging process is adopted, the alloy components comprise the Cu element, the Mg element and the Zn element; si element, Sn element and Al element; the variable-temperature aging process is executed after the alloy is subjected to conventional solution treatment, and comprises the following steps: carrying out high-temperature nucleation for the first time; first-time low-temperature growth; carrying out secondary high-temperature nucleation; and carrying out secondary low-temperature growth. Through the variable temperature aging process, nucleation and growth are decoupled, a high-density fine precipitated phase is obtained, the contradiction that strength and toughness of a traditional process are difficult to obtain at the same time is solved, and high-toughness matching is achieved.

The invention belongs to the technical field of composite aluminum alloy, and discloses an aluminum alloy composite board and a corrosion-resistant aluminum alloy composite board. The aluminum alloy composite board is of a double-layer structure which comprises a core layer and a corrosion-resistant layer; the core layer comprises a Si element, a Fe element, a Cu element, a Mn element and a Mg element, and the anti-corrosion layer comprises a Zn element, the Si element and the Fe element; the corrosion-resistant aluminum alloy composite board is obtained by carrying out zinc impregnation treatment on the aluminum alloy composite board. And after zinc impregnation treatment, the difference value between the potential of a Zn-element-free diffusion area of the anti-corrosion layer and the potential of the innermost layer of the core layer is smaller than or equal to 150 mV. The corrosion-resistant aluminum alloy composite board shows excellent layered corrosion in a corrosion environment.

The invention provides a 7xxx series aluminum alloy plate strip for anodic oxidation with a high recovery ratio and a preparation method of the 7xxx series aluminum alloy plate strip. The 7xxx series aluminum alloy plate strip comprises the following elements of 0.06%-0.12% of Si element, 0.10%-0.25% of Fe element, 4.5%-5.5% of Zn element, 2.0%-3.0% of Mg element, 1.2%-2.0% of Cu element, 0.05%-0.15% of Mn element, 0.10%-0.15% of Er element, 0.10%-0.12% of Zr element, 0%-0.03% of Ti element and the balance aluminum element. The aluminum alloy plate strip is prepared through the steps of reclaimed material grading pretreatment, low-liquid-level semi-continuous casting, multi-stage homogenizing heat treatment, hot rolling, cold rolling, solid solution, pre-stretching, two-stage aging and the like. Through joint optimization of material components and the process, the finished plate strip has excellent mechanical performance, an oxidation film is uniform in color and luster, and salt mist resistance, friction resistance and the like are achieved.

The application provides a copper-based alloy material and a preparation method and application thereof, and belongs to the technical field of copper-based alloy materials.The copper-based alloy material comprises Ag elements, Zr elements, Cu elements and inevitable impurity elements; the weight content of the Ag elements is 0.001-0.045%, the weight content of the Zr elements is 0.001-0.01%, the total weight content of the inevitable impurity elements is less than or equal to 0.001%, and the balance is the Cu elements.The application limits the content of the Ag elements, the Zr elements and the inevitable impurity elements in the copper-based alloy material, not only further improves the softening resistance of the copper-based alloy material, but also simultaneously makes the electric conductivity and the hardness of the copper-based alloy material in a better range, realizes the comprehensive improvement of the performance of the copper-based alloy material.In addition, the control of the content of the above elements in the copper-based alloy material also realizes the control of the cost of the copper-based alloy material, and ensures the maximization of the economic benefits of the copper-based alloy material.

The application discloses a composite coating with inert plating layer for reducing hot forming crack of high-strength steel, which is in a double-layer composite form and is obtained by pre-plating a layer of plating layer on the surface of high-strength steel, wherein the pre-plating layer contains at least one of B, Al, Cr, Cu, Mo and W elements, and the elements have positive mixing enthalpy with Zn element, that is, inert interaction with liquid Zn atoms. A conventional Zn plating layer is plated on the pre-plating layer. The thickness of each plating layer in the double-layer plating layer is 1-30 microns. The plating layer for reducing the hot forming crack tendency of high-strength steel combines chemical composition, element interaction and other factors, so that the liquid Zn atoms which are easy to penetrate along the grain boundary in the hot forming process are repelled by the plating component atoms in the pre-plating layer, the penetration of the liquid Zn atoms into the grain boundary of the steel base body is prevented, and the formation of the hot forming crack is reduced or even avoided. Through reasonable regulation and control of the element ratio of the plating layer, the purpose of effectively reducing the crack tendency of different types of high-strength steel in the hot forming and resistance spot welding processes can be achieved.

The invention discloses low-density corrosion-resisting steel containing copper Fe-Mn-Al-C and a preparation method of the low-density corrosion-resisting steel, and belongs to the technical field of metal material preparation. The corrosion-resistant steel comprises the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 18 to 22 percent of Mn, 7 to 10 percent of Al, 2.0 to 3.5 percent of Cu and the balance of Fe and inevitable impurities. Meanwhile, the chemical components meet the corrosion-resistant synergistic coefficient K, and K is larger than or equal to 0.09 and equal to Cu / (Mn + Al) and smaller than or equal to 0.11. The corrosion-resistant steel has a single-phase austenite matrix structure, and the Cu element is distributed in a supersaturated solid solution state in the matrix. The method is used for preparing the corrosion-resisting steel, and through the reverse design of'component cooperative locking 'and'forbidden aging solid solution process', pitting corrosion inducements are eliminated while low density is guaranteed, and excellent long-acting chlorine corrosion resistance is achieved.

The application discloses a ZrCu modified CVD-SiC anti-ablation coating and a preparation method thereof, and belongs to the technical field of ablation protection coatings. The preparation method can introduce Zr and Cu elements into the SiC coating through a molten salt reaction, forms a Zr-Si-Cu inlaid structure in the coating, and forms the ZrCu modified CVD-SiC anti-ablation coating with high compactness and uniform composition distribution. The method can prepare the ZrCu modified CVD-SiC anti-ablation coating with high compactness and uniform composition distribution at a relatively low temperature (1300-1500 DEG C) through simple process operation and a heat treatment device, and the preparation process is simple and easy to control without repeated deposition or multiple complex high-temperature reactions.

The invention provides a magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following elements in percentage by mass: 2.0 to 4.5 percent of Zn element, 1.0 to 2.5 percent of Sm element, 0.5 to 1.5 percent of Cu element, 0.1 to 0.6 percent of Ce element, 0.1 to 0.5 percent of A element, less than or equal to 0.15 percent of inevitable impurities and the balance of Mg element, wherein the element A is selected from any one or more of Ca element, Sr element and Zr element; the heat conductivity of the magnesium alloy ranges from 130 W / (m.K) to 142 W / (m.K), the tensile strength ranges from 260 MPa to 285 MPa, the yield strength ranges from 150 MPa to 170 MPa, and the ductility ranges from 10% to 15%. The magnesium alloy disclosed by the invention has relatively high heat conductivity and relatively high strength, so that the requirement of a high-power integrated light-weight electronic component heat dissipation piece is met.

The application discloses a strain-induced supersaturated solid solution analysis method for a non-miscible alloy system based on mixed entropy evolution, and the method comprises the following steps: for a target A-B binary alloy, a mixed entropy-component relationship diagram of the target A-B binary alloy is drawn; the average component and the initial equilibrium phase component point of the target A-B binary alloy are calibrated in the diagram; based on the increase of the mixed degree of the entropy generation driving force, the two-phase components are predicted to evolve in the entropy increase direction during a severe plastic deformation process, until a single-phase supersaturated solid solution is formed. Based on the irreversible thermodynamic principle, the severe plastic deformation process is defined as a continuous external entropy generation source for driving the evolution of the system, through the analysis of the dynamic competition mechanism of element mixing and element demixing dominated by the entropy generation source, the formation mechanism of the supersaturated solid solution is revealed, and the application provides a universal theoretical tool for understanding and predicting the supersaturated solid solution behavior of the non-miscible alloy system under the severe plastic deformation.

The application discloses a high-thermal-conductivity high-plasticity cast aluminum alloy and a preparation method thereof. The alloy is composed of the following components in percentage by mass: Zn: 2.0-12.0 %, M: 0.3-3.0 %, B: 0.05-0.3 %, and the balance of Al and inevitable impurities, wherein M is at least one of La, Ce and Ca; the atomic percentage content ratio of Zn and M in the aluminum alloy is Zn / M >= 2; the aluminum alloy comprises a matrix phase and a eutectic phase; the eutectic phase is an Al-M-Zn ternary phase distributed in a network shape. The application dopes Zn, Ce, La and Ca elements which have little influence on the thermal conductivity as main alloying elements in the Al matrix, controls the reasonable combination of Zn and Ce, La and Ca elements, ensures that the alloy has excellent casting performance, reduces the die sticking of the alloy in the die casting process through Fe and Mn, improves the strength of the alloy through Mg, Si and Cu elements, finally reasonably designs the components, and significantly improves the thermal conductivity and the elongation of the aluminum alloy which is not less than 10 %, and expands the application range of the aluminum alloy.

The application discloses a kind of corrosion-resistant magnesium alloy based on high Zn, Al content and preparation method thereof, the magnesium alloy includes the following mass percentage components: Zn 5%~8%, Al 5%~15%, Y 0.1%~3%, Mn 0.1%~2%, the balance is Mg and inevitable impurities.The application utilizes the synergistic effect of Al and Zn, Y element, forms dispersed distribution Al2Y, Mg-Al-Y-Zn and Mg-Al-Y phase in as-cast structure, effectively refines grain and blocks corrosion propagation channel, meanwhile, the solid solution effect of Al element promotes the formation of continuous and dense composite protective film on the substrate surface.The alloy does not need complex surface treatment or heat treatment, and the hydrogen evolution corrosion rate in 3.5% NaCl solution can be as low as 0.3 mm / a.The application not only significantly improves the intrinsic corrosion resistance of high Zn, Al content corrosion-resistant magnesium alloy, but also has low cost and simple process, providing a new idea for the large-scale application of corrosion-resistant as-cast magnesium alloy.

The application discloses a high-strength and high-plasticity Mg-Y-Zn-Si-Li-Al alloy and a preparation method thereof, and relates to the technical field of light alloy processing. 97.5 Y1Zn 0.5 In the Mg 97.5 Y1Zn 0.5 Si1base alloy, the Si element is combined with the Y element to form a YSi hard and brittle phase, which is easy to hinder the elongation of the alloy; the addition of the Li element plays a grain refining role on the one hand, effectively improves the strength of the alloy, and optimizes the second phase form on the other hand, promotes the transformation of the second phase to the nanometer level, provides more slip paths for dislocation movement, and avoids plasticity deterioration; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, which not only reduces the precipitation of the hard and brittle phase, but also stabilizes the organizational structure through the pinning effect at the grain boundary.

This invention discloses a method for suppressing the formation of brittle borides in nickel-based brazing filler metals and its application. The method involves compounding a certain amount of metallic Cu powder onto a commercially available BNi-2 nickel-based brazing filler metal. The content of the reinforced BNi-2 nickel-based brazing filler metal is 95-99 wt.%, and the content of Cu element is 1-5 wt.%. The elemental composition of the BNi-2 nickel-based brazing filler metal by mass percentage is as follows: Cr: 6-8 wt.%, Si: 4-5 wt.%, Fe: 2.5-3.5 wt.%, B: 2.75-3.5 wt.%, with the balance being Ni. The Cu-reinforced nickel-based brazing filler metal is applied between the surfaces of two stainless steel base materials and bonded using organic adhesive, resulting in a sandwich structure of stainless steel / Cu-reinforced BNi-2 brazing filler metal / stainless steel. The components are then brazed under vacuum conditions. The reinforcement method provided by this invention effectively suppresses the brittle phase at the weld center, which has a significant impact on performance. The joint forms a complete nickel-based solid solution, further improving the shear strength of the joint and overcoming the inherent shortcomings of nickel-based brazing filler metals.

The invention belongs to the technical field of soluble magnesium alloy rods, and discloses a soluble magnesium alloy rod with enhanced elongation, and the magnesium alloy rod comprises the following chemical components in percentage by mass: 1.5%-14.5% of Gd element, 0.5%-4.0% of Y element, 0.1%-2.5% of Zn element, 0.2%-0.5% of Zr element, 0.01%-0.5% of Li element, 0.01%-0.6% of Ni element, 0.01%-0.5% of Ga element, 0.01%-0.5% of In element, 0.1%-2.0% of Cu element and the balance of Mg element. In component design, various elements are scientifically proportioned, the proportion of Gd to Y and the proportion of Zn to Zr are just right, specific elements are added to form a composite structure, the ductility is improved, the dissolution rate and strength are balanced by means of the Cu element, in the performance aspect, dissolution is accelerated at the high temperature of 200 DEG C, the dissolution rate is increased by 10%-15% compared with the room temperature, the degradation period can be shortened, a dissolved product is fine and uniform, and the degradation rate is high. The biocompatibility and environmental friendliness are excellent, the application field is wide, and degradable medical instruments are covered.

This invention discloses a Cu-doped nitride composite coating and its preparation method, belonging to the field of current-carrying friction coating technology. The technical problem to be solved by this invention is how to improve the resistance of the substrate material to current-carrying friction, so that it can withstand the tribological material of the power system discharge effect to reduce the negative impact of stray current, thereby improving the bearing life and thus improving the stability and energy efficiency of electric vehicles. The technical solution adopted is as follows: the composite coating includes a substrate layer, a single Nb transition layer is disposed on the upper surface of the substrate layer, and an NbN-Cu coating is disposed on the upper surface of the single Nb transition layer. The atomic percentage of Cu element in the NbN-Cu coating is 6.88%≤Cu≤25.30%.

The invention relates to the field of biotechnology, in particular to an enhanced piezoelectric material for triggering sonodynamic response as well as a preparation method and application of the enhanced piezoelectric material. According to the invention, the UIO-66 (at) Cu-SS is prepared by introducing a Cu element to enhance the sonodynamic response of a metal organic framework material (UIO-66) with a piezoelectric property. According to the invention, the Cu-Cu composite material is beneficial to the valence state conversion process of the Cu element, can effectively improve the sonodynamic response characteristic and promote the explosive generation of active oxygen, also has the glutathione degradation performance, and can effectively promote the antibacterial effect. Therefore, the UIO-66 (at) Cu-SS is prepared by introducing the Cu element, so that the sonodynamic response characteristic of the UIO-66 is further enhanced.

The invention discloses a Mg-Y-Zn-Si-Li-Al alloy with a high product of strength and elongation and a preparation method of the Mg-Y-Zn-Si-Li-Al alloy, and relates to the technical field of light alloy processing. According to the Mg-Y-Zn-Si-Li-Al alloy with the high product of strength and elongation and the preparation method of the Mg-Y-Zn-Si-Li-Al alloy, in the Mg97.5 Y1Zn0. 5Si1 basic alloy, the Si element and the Y element are combined to form a YSi hard and brittle phase, and the phase serves as a stress concentration point and is prone to hindering improvement of the elongation of the alloy; the Li element is added, on one hand, the grain refinement effect is achieved, the alloy strength is effectively improved, on the other hand, the form of a second phase is optimized, the second phase is promoted to be converted to the nanoscale, more slippage paths are provided for dislocation motion, and plasticity deterioration is avoided; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, precipitation of hard and brittle phases is reduced, and the structure is stabilized through the pinning effect at the grain boundary.