306 results about "Ni element" patented technology

The invention relates to a method for connecting a Cf / SiC composite material and an Ni-based high-temperature alloy, belonging to the field of heterologous material connecting. The technical process comprises the following steps of: (1) carrying out reaction pretreatment on the welding surface of a composite material by utilizing alloying metal liquid; and (2) vacuum brazing connecting. The method is characterized in that the pre-reaction is carried out by applying the welding surface of the titanium-contained metal liquid and the composite material to form a welding surface with raised carbon fibers so as to improve the bonding strength of a subsequent brazing connected interface, and a stable reaction layer containing Ti is formed on the welding surface SiC of the composite material so as to prevent the graphitization reaction of SiC and Ni in the composite material in the subsequent brazing connecting process. A powder containing W and SiC is added to a brazing material, which can prevent the Ni element from diffusing to the composite material in the brazing connecting process, reduce the thermal stress of joints and strengthen the joints. The invention can be conveniently applied to practical work; and the joints have good high-temperature strength and gas tightness. The invention is also suitable for connecting carbon fiber reinforced SiC composite materials and other metals.

The invention provides a nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide positive pole material, a preparation method thereof and a lithium ion battery. The nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide positive pole material has a near-spherical appearance and a core-shell structure, wherein the content of Ni element in an inner layer is high, the content of Mn element in an outer layer is high, bulk molybdenum element doping is performed, and the surfaces of particles are coated with aluminum oxide. The reversible discharge capacity of the nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide positive pole material provided by the invention under the current density of 350mA / g is more than 172mAh / g, and the capacity retention rate after 100 times of charge and discharge cycles at the rate of 2C is more than 85%. The lithium ion battery which takes nickel-rich concentration gradient type lithium nickel cobalt aluminum oxide as the positive pole material has the prominent advantages of high capacity, good thermal stability, good cycling stability, excellent rate property and the like, and has broad application prospects in the fields of electronic equipment, communication, transportation and the like.

The present invention relates to medical stainless steel implant material, and is especially one kind of medical no-nickel stainless steel material. Chemically, the medical no-nickel stainless steel material includes Cr 17-24 wt%, Mn 12-20 wt%, Mo 1-3 wt%, Cu 0.5-1.0 wt%, N 0.71-1.20 wt%, C not more than 0.03 wt% and Fe for the rest. The medical no-nickel stainless steel material containing no toxic Ni element may be used in surgical implant, medical equipment, food appliance, ornament and other product contacting direct to human body, and may be also used in chemical, environment protecting and other fields.

The invention discloses high nitrogen and low nickel duplex stainless steel and a manufacturing method thereof. The duplex stainless steel comprises the following chemical compositions in percentage by weight: 0.01 to 0.10 percent of C, 0.2 to 1.0 percent of Si, 4.0 to 12.0 percent of Mn, 18.0 to 23.0 percent of Cr, more than or equal to 0.2 percent and less than 1.0 percent of Ni, 0.2 to 0.4 percent of N, less than or equal to 1.0 percent of one or more of Mo, W and Cu, and the balance of Fe and inevitable impurities. Because the content of the Ni element is more than or equal to 0.2 percent and less than 1.0 percent, a temperature 20 to 100 DEG C lower than the conventional annealing temperature is adopted, namely an annealing treatment process between 950 and 1,030 DEG C is adopted so as to effectively reduce production cost; meanwhile, the duplex stainless steel still maintains high strength, excellent room temperature impact property and corrosion resistance, and can be massively applied to the fields such as coastal buildings, petrochemical industry and the like; meanwhile, preparation and heat treatment processes are simple, and the production is convenient.

The invention relates to non-magnetic hard-section nickel austenitic stainless steel. The non-magnetic hard-section nickel austenitic stainless steel comprises the following chemical components by weight percentage: 0.07-0.12 percent of C, 0.2-1.0 percent of Si, 6.5-9.0 percent of Mn, 17.0-18.0 percent of Cr, 3.5-4.5 percent of Ni, 0.16-0.35 percent of N, 0.51-0.95 percent of Mo, 0.5-2.0 percent of Cu, as well as optionally one or two of 0.02-0.1 percent of V and 0.02-0.1 percent of Nb, and Fe and inevitable impurities in balancing amount. the Ni element is replaced by the C element and the N element to prepare an austenite tissue at room temperature, so that the content of the expensive Ni element can be effectively reduced, thereby reducing the cost; through the synergistic effect of Cr, Mo and N, the pitting resistance equivalent PREN of the material is ensured to be more than or equal to 18, and the corrosion resistance is improved and is equivalent to that of 304; by controlling the Md30 / 50 temperature to be lower than -35 DEG C and the lowest Md30 / 50 temperature to be -125 DEG C, after reduction of the cold rolling pressure by 0-80 percent, the yield strength of the material is 360-1590 MPa, but no Martensite phase is formed, so that the material keeps a non-magnetic characteristic, can be widely applied to electronics, apparatuses and instruments and other industries; and compared with the cost of 304 and 305, the cost of the material is obviously reduced.

A hard material layer is deposited on a workpiece as a functional layer by an arc-PVD method. The layer is essentially an electrically insulating oxide of at least one of the metals (Me) of the transition metals of the sub-groups IV, V, VI of the periodic table and Al, Si, Fe, Co, Ni, Co, or Y and the functional layer (32) contains no noble gas or halogen.

The invention discloses a metal support half-cell of a solid oxide fuel cell and a preparation method thereof. The half-cell comprises a porous metal supporting layer thick membrane, a porous cermet gradient transition layer film, a porous anode layer and a compact electrolyte layer film from down to up. The porous gradient transition layer composed of a mixed oxide and a oxide with a fluorite structuring can avoid the direct contact of the porous metal supporting layer and the porous anode layer, and the mutual diffusion of Fe / Cr elements in the metal supporting layer and Ni element in the porous anode layer can be reduced under high temperature sintering condition. The mixed oxide is reduced to an alloy under the work condition of the cell; a high anode active material is formed at a side interface of the anode, a high conductivity composite material which takes the alloy as a main phase is formed on the side interface of a metal support body, so that higher conductivity is presented, ohmic resistance is reduced, electrocatalytic activity is not reduced, long-term stability for operation of the cell can be ensured, and good combination of the porous metal supporting layer and the porous anode layer can be simultaneously realized.

A laminated semiconductor ceramic capacitor with a varistor function includes a component body having a plurality of semiconductor ceramic layers formed of a SrTiO3-based grain boundary insulated semiconductor ceramic and a plurality of internal electrode layers predominantly composed of Ni, and external electrodes on both ends of the component body. The external electrodes are electrically connected to the internal electrode layers. A thickness of each of the semiconductor ceramic layers, excluding the outermost semiconductor ceramic layers, is 20 μm or more, and an average grain diameter of crystal grains in the semiconductor ceramic layers is 1.5 μm or less. When a central part or the vicinity of the central part in a laminating direction of the semiconductor ceramic layer is analyzed by a WDX method, a ratio x / y of the intensity x of the Ni element to the intensity y of the Ti element is 0.06 or less.

The invention belongs to the technical field of the lithium ion battery material preparation, and specifically relates to a preparation method of a nickel-cobalt-manganese ternary material enabling element content in gradient distribution. The chemical formula of the positive material is LiNixCoyMnzO2, x is not less than 0.5 and not more than 0.9, and the sum of x, y and z is equal to 1. The preparation process disclosed by the invention is based on co-precipitation method principle, the concentration of the metal ion entering the reaction kettle is continuously changed by changing the feedingway, the Mn element concentration is gradually increased, the concentration of each of the Ni element and the Co element is gradually reduced, thereby synthesizing the nickel-enriched positive material precursor particle with gradiently increased Mn element content and gradiently reduced Ni element content from center to the surface, and finally the nickel-enriched positive material with elementsin gradient distribution is formed by calcining the nickel-enriched positive material precursor particle with the lithium source in a mixed way. The full-gradient material is obviously different fromthe material with uniformly distributed elements from inside to outside and synthesized through the common co-precipitation method, and the higher specific capacity and good circulating performance and heat stability are provided.

The invention discloses a high-entropy alloy reinforced 2024 aluminum based composite material. The high-entropy alloy reinforced 2024 aluminum based composite material is prepared from AlxCoCrFeNi high-entropy alloy and a 2024 aluminum substrate, wherein the volume fraction of the AlxCoCrFeNi high-entropy alloy is 5 to 20 vol%, the rest is the 2024 aluminum substrate, and the atomic ratio of Al,Co, Cr, Fe and Ni elements in the AlxCoCrFeNi high-entropy alloy is (0.2 to 1):1:1:1:1. According to the high-entropy alloy reinforced 2024 aluminum based composite material, the problem of poor wettability of an existing ceramic reinforced metal matrix composite material is solved, and additionally, the application of the aluminum based composite material in the techniques of aviation, space, electronics, communication and the like and in the industries of machinery, chemical engineering, energy and the like can be promoted through multiple excellent effects and performance of high-entropy alloy.

The invention discloses a high-strength-toughness isothermal quenching ductile iron as well as a production method and application of the ductile iron and belongs to the technical field of metal material preparation. Mainly based on normal ductile cast iron, the thickness of a main bearing part of a cast is taken as the size factor of the cast, the addition amount of Mn, Mo and Ni elements is limited according to the thickness of the main bearing part, so that the high-strength-toughness isothermal quenching ductile iron suitable for the casts with different wall thicknesses is determined. Under the same quenching degree, alloy elements are effectively reduced, so that the production cost of isothermal quenching ductile iron is remarkably reduced; and therefore, the high-strength-toughness isothermal quenching ductile iron can be widely applied to various metal structure components with large loading and high safety coefficient requirement, and is especially suitable for replacing forged steel to produce car supercharged gasoline engine crankshafts and high-power diesel engine crankshafts.

The invention discloses a high-strength and high-plasticity magnesium alloy. The high-strength and high-plasticity magnesium alloy comprises the following components in percentage by mass: 3.0-4.5% of Ni, 4.0-5.0% of Y, 0.01-0.1% of Zr, not more than 0.15% of inevitable impurities and the balance of magnesium. According to the high-strength and high-plasticity magnesium alloy disclosed by the invention, Y and Ni elements are simultaneously added into a magnesium matrix, and in the smelting and molding process of the alloy, Y and Ni form Mg2Ni and Mg12YNi phases with the magnesium matrix, wherein the Mg12YNi phase is a long-period stacking ordered structure (LPSO), so that the strength of the alloy can be improved, and the plasticity of the alloy can also be improved; and Mg2Ni can improve the strength of the alloy by a strengthening mechanism of the second phase. According to the high-strength and high-plasticity magnesium alloy disclosed by the invention, an appropriate amount of Zr element is further added into the alloy, and zirconium can be dispersed and distributed in the matrix in an elemental form by controlling the smelting and molding process to play a role in refining grains.

The invention provides a manufacturing method of steel, comprising the following steps: smelting the molten steel to ensure that the content of P in the molten steel is less than or equal to 0.035%, the content of S is less than or equal to 0.015% and the content of V is less than or equal to 0.15%; then adding Cu element and Ni element to the molten steel to ensure that the content of Cu in the molten steel is 0.20-0.60% and the content of Ni is 0.15-0.55%; tapping to a steel ladle when the content of C in the molten steel is below 0.05%; adding physical mixture of lime and fluorite and predeoxidizing agent to the steel ladle in the tapping process to ensure that the content of S in the molten steel is less than or equal to 0.012%; adding Cr element, Si element and Mn element to the molten steel to ensure that the content of Si in the molten steel is 0.25-0.60%, the content of Mn is 0.80-1.60% and the content of Cr is 0.20-0.80%; feeding Al simple substance to the molten steel to carry out final deoxidation; heating the molten steel in the condition of argon blowing to lead the steel slag to melt; then adding Al simple substance to the steel ladle to ensure that the content of S in the molten steel is less than or equal to 0.010%; and then adding C element to the molten steel to ensure that the content of C in the molten steel is 0.08-0.16%; feeding Al simple substance and alloy containing Ti, V and N to the molten steel to control that the content of acid-soluble aluminium in the molten steel is 0.025-0.040%, the content of Ti is 0.005-0.015%, the content of V is 0.08-0.15% and the content of N is 0.010-0.020%.

The invention discloses an Ag based electrical contact material and a preparation method thereof. The material comprises the following components in percentage by weight: not more than 1 and not less than 5 percent of carbon material, not more than 0.5 and not less than 5 percent of additive and the balance of silver, wherein the carbon material relates to one or more of diamond, graphite and carbon, and the additive relate to one of W and Ni elements. The high melting point character of the carbon material is helpful to improve the melting-welding resistance of the surface of a contact, and the superfine W and Ni elements are added by using a liquid phase deposition surface pretreatment method, thereby ensuring that the W or Ni element is uniformly distributed on the surfaces of carbon reinforced particles, improving the electrical conductivity of the reinforced particles and prolonging the service life of the contact material. The Ag based electrical contact material with fine capabilities of melting-welding resistance and electric arc burn resistance is obtained by combining the working procedures such as mixing powder, compacting, sintering, extruding and the like.

The invention relates to a TiNiNb / NbTi memory alloy composite material and a preparation method thereof. The composite material comprises the following compositions in percentage by weight: 31 to 95 atomic percent of Nb element, and Ti element and Ni element in an atomic ratio of 1:1 to 2.5:1, wherein the total atomic percentage of the Ti element, the Ni element and the Nb element is 100 percent.The preparation method comprises the following steps: selecting elementary niobium, titanium and nickel with the purity of more than 99 weight percent in the composition ratio of the TiNiNb / NbTi memory alloy composite material; and putting the elementary niobium, titanium and nickel into a melting furnace at a vacuum degree of higher than 10-1 Pa or with inert gas protection to be melted into the TiNiNb / NbTi memory alloy composite material. The composite material provided by the invention has the property of a memory alloy intelligent composite material, and has the characteristics of high strength, good interface bonding, wide application temperature range and the like.

The invention is applicable to the technical field of lithium batteries, and provides a high-energy density type lithium cobaltate cathode material and a preparation method thereof. According to the high-energy density type lithium cobaltate cathode material and the preparation method thereof, doped type primary lithium cobaltate particles are generated by performing solid phase reaction on a cobalt source which is pre-doped with Ni element, an additive and a lithium source, and then the surfaces of the doped type primary lithium cobaltate particles are coated with a doped N element-containingLiVPO4F material which is stable under high voltage, wherein the cobalt source is pre-doped with Ni, so that the Ni element can be distributed more uniformly in a substrate, and a material structureis more stable in a charging-discharging cyclic process; meanwhile, the substrate is added with an M element, so that the effect of stabilizing the material structure is further achieved. The LiVPO4Fmaterial has the advantages of stable structure, high voltage platform and the like; the lithium ion conductivity of the LiVPO4F material can be further improved through doping. The lithium cobaltatecathode material provided by the invention can be normally used under the max charge voltage of 4.50 V, and has excellent cycle performance and safety performance.

The invention discloses castable and forgeable solid solution tungsten alloy and a preparation method, and belongs to the technical field of refractory alloy. According to the chemical components, thecastable and forgeable solid solution tungsten alloy comprises, by weight percentage, 20%-75% of W, 0%-20% of Mo, 0%-20% of Nb, 0%-20% of Ta, 0%-10% of Hf, 0%-10% of V, 0%-10% of Zr, 0%-10% of Ti, 0%-10% of Al, 0%-5% of Cu and the balance Ni or Co and inevitable impurity elements and microelements, specifically, the Ni element and the Co element can be partially replaced by one or two or more elements of 0%-50% of Ir, 0%-30% of Fe, 0%-20% of Cr, 0%-20% of Re and 0%-20% of Ru. The castable and forgeable solid solution tungsten alloy further comprises the following one or two or more grain boundary strengthening elements of 0.001%-1.0% of C, 0.001%-1.0% of B, 0.001%-1.0% of Y, 0.001%-1.0% of La or Ce or the rare earth element, 0.001%-1.0% of Mg and 0.001%-1.0% of Ca. The castable and forgeable solid solution tungsten alloy has the advantages of being high in density, ultrahigh in strength, high in toughness and high in hot-working performance. The alloy is castable and forgeable and canbe formed through 3D printing, the density ranges from 11.0g / cm<3> to 15.0g / cm<3>, the impact toughness is 80J / cm<2> or above, and the tensile strength is 1700MPa or above.

To provide a cathode active material which achieves a high discharge capacity and excellent cycle durability.A cathode active material represented by LiaMOx (wherein M is an element including at least one member selected from Ni element, Co element and Mn element (other than Li element and O element), “a” is from 1.1 to 1.7, and x is the number of moles of O element required to satisfy the valences of Li element and M),wherein in an X-ray diffraction pattern, the ratio (I / r) of the crystallite size (I) of (003) plane to the crystallite size (r) of (110) plane assigned to a crystal structure with space group R-3m is at least 2.6.

The invention discloses low-alloy high-intensity high-toughness steel and a production method of low-alloy high-intensity high-toughness steel. The method comprises the following work procedures of: the casting work procedure: the casting is carried out according to the following ingredients and contents to obtain low-alloy steel cast ingots: 0.15 to 0.30 weight percent of C elements, 0.30 to 0.70 weight percent of Si elements, 0.60 to 1.00 weight percent of Mn elements, 0.60 to 1.10 weight percent of Cr elements, 0.50 to 1.00 weight percent of Ni elements, 0.20 to 0.60 weight percent of Mo elements and the balance Fe and unavoidable impurities; the forging work procedure: the low-alloy steel cast ingots are forged, in addition, the blank opening forging heating temperature is 1160 DEG C to 1200 DEG C, the final forging temperature is 650 DEG C to 900 DEG C, and the deformation in each firing time is not smaller than 30 percent; and the heat treatment work procedure: the temperature of the forged and formed forgings is raised to 900 to 940 DEG C to be subjected to normalizing, the temperature is raised to 880 to 920 DEG C for carrying out quenching after the normalizing treatment, the temperature is raised to 530 to 600 DEG C for carrying out high-temperature tempering after the quenching treatment, and the low-alloy high-intensity high-toughness steel is obtained. In the embodiment of the invention, the low-alloy high-intensity high-toughness steel has high intensity and high toughness.

The invention relates to a high-strength cast aluminum-silicon alloy for an engine body and a preparation method thereof, belonging to the field of metal materials. The alloy comprises the following components in percentage by weight: 12.0-14.0% of Si, less than 0.3% of Ni, 3.0-5.0% of Cu, 0.3-0.8% of Fe, 0.4-0.8% of Mn, less than 0.4% of Mg, 0.1-0.2% of Ti, less than 0.27wt% of Zr and balance of Al. Heat treatment parameters are as follows: the solution treatment is carried out at 510+ / -5 DEG C for 5-8h and then water quenching is carried out at room temperature; and the aging treatment is carried out at 160+ / -5 DEG C for 6-10h and then air cooling is carried out. The tensile strength and the yield strength of the alloy at room temperature after heat treatment respectively reach 316-336MPa and 245-263MPa, the elongation of the broken alloy reaches 0.72-0.83%, and the Brinell hardness reaches 155-166HBW to the maximum. Compared with the similar alloys, the alloy of the invention has the advantages of high mechanical properties, low content of Ni elements, reduction of content of noble elements in the alloy, wider allowed fluctuation range of content of Fe elements, good cast ingot quality, simple processes and strong operability.

The invention provides a pipe made of high-strength and high-tenacity X90 thick wall seamless pipeline steel tube and a manufacturing method thereof, and the steel type comprises the following elements in percentages by weight: 0.08-0.12% of C, 0.20-0.32% of Si, 1.25-1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.016-0.042% of Al, 0.03-0.05% of Nb, 0.05-0.07% of V and 0.12-0.18% of Cu, wherein the contents of Cr, Mo and Ni elements in the steel are determined according to the wall thickness value of a steel pipe, the balance of are ferrum, and a trace amount of impurity elements. The invention also provides a production method of the rolling and heat processing of the seamless pipeline steel. The invention has the beneficial effects that a micro-alloying technique is adopted; the seamless pipeline steel is suitable for the production of a thick wall pipeline of the wall thickness below 50mm; a pipe body integrative structure is a uniform tempering bainite structure; the carbon equivalent is low; the welding properties are good; the low-temperature impact properties are excellent; the requirements for the thick wall pipeline of deep sea or other cold weathers are achieved; the hardenability of the steel is enhanced in the process of water cooling; and the mechanical properties of a pipeline are enhanced.

A method for improving the impact toughness of Ti-containing high-strength steel in a thickness larger than or equal to 10mm comprises the following steps: continuously casting and cast blank heating; rough rolling; fine rolling; cooling; rolling for standby, wherein the method is suitable for the following conditions: the Ti content is not lower than 0.06%, the N content is not higher than 0.004%, and Nb and Ni elements are not added to the steel. According to the invention, under the premise of meeting the strength of steel plates with specifications larger than 10mm, the alloy cost is lowered, and the impact power of the Ti-containing reinforced high-strength steel at the temperature of minus 20 DEG C is not lower than 55J.

The invention discloses a filler wire argon tungsten-arc welding process for a molybdenum-copper alloy and a nickel-base superalloy. The filler wire argon tungsten-arc welding process comprises the steps of surface processing, fixed point welding, preheating before welding, welding, weld pass cleaning and slow cooling after welding. A Ni-Fe-Cr system alloy welding wire is adopted in the filler wire argon tungsten-arc welding process, and the content of a Ni element in the welding wire is controlled, so that the density of a heat affected zone organization on one side, close to the molybdenum-copper alloy, of a connector can be effectively improved. The filler wire argon tungsten-arc welding process for the molybdenum-copper alloy and the nickel-base superalloy has the advantages of being convenient to operate, stable in connector performance, high in welding efficiency, convenient to popularize and apply and the like. The filler wire argon tungsten-arc welding process is particularly suitable for welding the molybdenum-copper alloy and the nickel-base superalloy, and also can be used for welding the molybdenum-copper alloy and other high-temperature alloys.

The invention relates to a mixed low carbon alkane dehydrogenation catalyst and a preparation method thereof. A problem of low activity of dehydrogenation catalysts prepared through present technologies is mainly solved. The mixed low carbon alkane dehydrogenation catalyst comprises 0.1-10% of Pt and Pd elements or oxides thereof, 0.25-10wt% of Sn, Fe, Ni elements or oxides thereof, 0.1-10wt% of Na, Li and K elements or oxides thereof, 0-10wt% of Nb, Mo, Ta and W elements or oxides thereof, and 70-99wt% of ZSM-5 with different Si / Al ratios. The mixed low carbon alkane dehydrogenation catalyst well solves the problem, and can be used in the industrial production for preparing low carbon olefins through the mixed low carbon alkane dehydrogenation.

The invention discloses laser-cladding cobalt-base alloy powder and a repairing method for repairing a damaged expander blade. The laser-cladding cobalt-base alloy powder comprises the following raw materials in percentage by mass: 20.0% to 50% of Co, 1.0% to 3.0% of W, 2.0% to 5.0% of Mo, 20.0% to 26.0% of Cr, 19.0% to 45.0% of Fe, 0 to 9% of Ni and the balance of Si. The repairing method comprises the following steps: pre-treating the damaged expander blade before laser cladding; performing reverse modeling by three-dimensional laser scanning; determining the to-be-repaired position and size of the blade; performing multi-track lapped laser cladding repair on the damaged expander blade by using the laser-cladding cobalt-base alloy powder. The laser-cladding cobalt-base alloy powder disclosed by the invention adopts austenite as a main phase; Co and Ni elements are used for stabilizing the main phase; W and Mo elements are added, and meanwhile, the content of Si and B elements is reduced, so the toughness and corrosion resistance are improved, and the phenomenon of cracking generated during multi-track lapping of a laser cladding layer is reduced. The alloy powder component has the effects of lowering the cost and improving the stability of a cladding technique, and the laser repair quality and the effective service life of the blade of an energy recycling turbo expander are guaranteed.

The invention provides a Cr3 series hot work die steel. The hot work die steel comprises, by weight percentage, 0.38%-0.50% of C, 0.15%-0.70% of Si, 0.30%-0.90% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 2.80%-3.50% of Cr, 1.40%-2.00% of Ni, 1.80%-2.60% of Mo, 0.10%-0.50% of V, 0.020%-0.10% of Al, 0.02%-0.20% of Nb and the balance Fe. According to the chemical component formula of the Cr3 series hot work die steel (remembered as YD3 series die steel), compared with existing Cr3Mo3(4Cr3Mo3SiV, H10) series hot work die steel, C, Mn and Cr of the YD3 series die steel are equivalent in content, the content of Mo, V and Si is reduced, the Ni element is added, the Nb element is added, the Al element is added, and therefore toughness is improved.

A copper-nickel based multielement high corrosion resisting alloy belongs to the technical field of the metal materials. The general expression of the high corrosion resisting alloy component is CuMNi; wherein, the M element is selected from one or more of transition metal elements Fe, Mn, Cr, V, Nb, Mo and Zn; x and z are respectively atomic percents of Cu and Ni elements; y is the total atomic percent of one or more elements of the transition metal elements; x+y+z=100%; x is 7 to 95%; z / y=12; the optimum content of the M in the modified Cu-Ni alloy added with M and the element category of the M are determined according to the cluster model quantitative, thus overcoming the casualness of the traditional alloy component, solving the Cu-Ni alloy corrosion resistance composition optimization and obviously improving the corrosion resistance performance of the existing Cu-Ni alloy. The alloy component design method is characterized by clear theoretical background, being easy to use, accuracy and reliability, and university. The method has the advantages of simple technique and easy implementation; a smelting and homogenizing annealing technology for heating processing is adopted for obtaining the single-phase solid solution structure of the copper-nickel based multielement alloy, thus guaranteeing the alloy to have excellent processability and decay resistance performance.

Characters are that combined hydrothermal method and calcinations method is adopted in the invention. Technical steps are: adding manganese salt including doped Co, Cr, Ni elements and aqueous solution of lithium salt according to solid to liquid ratio 1:10 into reaction kettle; hydrothermal reaction is carried out under certain temp, pressure and time; after reaction, reaction liquid in the kettle passes through cooling, filtering, washing and drying procedures; then calcinations in high temp is carried out in baking furnace so as to obtain product of laminar lithium manganate.

The invention relates to component design and a production method of 1500 MPa-grade low-carbon and medium-manganese copper-contained steel. The 1500 MPa-grade low-carbon and medium-manganese copper-contained steel comprises the following chemical components in percentage by mass: 0.20-0.23% of C, 0.5-0.8% of Si, 3.5-4.0% of Mn, 1.2-2.0% of Al, 0.5-1.0% of Cr, 0.6-1.0% of Cu, 0.2-0.5% of Ni, 0.003-0.012% of N, 0.00051-0.003% of B, and the balance of Fe and inevitable impurities. One part of alloy elements are added based on traditional TRIP steel to largely increase the content of manganese to reach the medium-manganese range; when Al is used for replacing the Si elements, a proper amount of Si elements are retained, so that the Al and Si elements are matched for use; and a certain quantity of precipitation-hardened Cu elements are added to match with a proper amount of Ni elements for use to eliminate the hot brittle phenomenon caused by Cu in hot working. In addition, few Cr elements are added; a proper amount of N elements are added to match with the Al elements for use; through matching between hot rolling and hot partition processes, a martensite+residual austenite+separated second-phase particle structure with ultrahigh strength and excellent plasticity is obtained; and the tensile strength exceeds 1500 MPa.

To provide a cathode active material to be used for a positive electrode of a lithium ion secondary battery having a high discharge capacity and favorable cycle durability.A cathode active material, which comprises a lithium-containing composite oxide containing at least one transition metal element (X) selected from the group consisting of Ni element, Co element and Mn element, and Li element (provided that the molar ratio (Li / X) of the Li element based on the total amount of the transition metal element (X) is from 1.1 to 1.7),wherein the aspect ratio of primary particles is from 2.5 to 10, andin an X-ray diffraction pattern, the ratio (I020 / I003) of the integrated intensity (I020) of a peak of (020) plane assigned to a crystal structure with space group C2 / m to the integrated intensity (I003) of a peak of (003) plane assigned to a crystal structure with space group R-3m is from 0.02 to 0.3.