72 results about "Co element" patented technology

The invention discloses a high-performance sintered neodymium-iron-boron magnet and a preparation method thereof.The high-performance sintered neodymium-iron-boron magnet is characterized in that raw materials for preparing the neodymium-iron-boron magnet comprise a main alloy and an auxiliary alloy, and the auxiliary alloy does not contain Fe and Co elements; the microstructure of the neodymium-iron-boron magnet comprises a matrix phase and a rare earth-rich grain boundary phase, the matrix phase is (RE / RE ') 2 (F) 14B, F is Fe and Co, the content of Co is 0-3, the mass percent of Fe to RE / RE' in the rare earth-rich grain boundary phase is 1: (1.4-7), RE is Nd or PrNd, and RE 'is one or more of Pr, Ho, Dy and Tb. The neodymium-iron-boron magnet has relatively high magnet magnetic performance.

The application discloses a kind of martensitic age steel of additive manufacturing and preparation method thereof, the martensitic age steel, according to mass percentage, its composition is as follows: Ni 16~22%, Co0-5%, Mo 2~6%, Ti 0.2~2.5%, Al 0~1.5%, Re 0~0.3%, wherein Re is selected from at least one of Y or La, the balance is Fe and inevitable impurities.In the application, by reducing Co element, adjusting the ratio of Ni, Ti and Mo in the alloy, while adding a small amount of rare earth (Y and La) element, the alloy has higher M s Under the premise, the raw material cost of alloy powder and the preparation cost of alloy are greatly reduced, and the fine equiaxed grains and high-density nano precipitates formed after aging are formed by combining with the process parameter control of additive manufacturing, so that the mechanical properties of the martensitic age steel are greatly better than those of the traditional casting process.

The invention discloses a multiphase synergistically strengthened copper-titanium alloy, the microstructure of the copper-titanium alloy has the following nano-structures: a cellular structure, a nano laminated structure formed by alternately arranging beta-Cu4Ti phases and alpha-Cu matrix phases, the beta-Cu4Ti phases are lamellar or fibrous beta-Cu4Ti discontinuous precipitated phases, and the alpha-Cu matrix phases are lamellar or fibrous beta-Cu4Ti discontinuous precipitated phases; and the beta '-Cu4Ti continuous precipitated phase is uniformly distributed in the alpha-Cu matrix phase and is in a coherent or semi-coherent relationship with the alpha-Cu matrix phase. The invention further discloses a preparation method of the multiphase synergistically strengthened copper-titanium alloy. On the basis of the comprehensive requirements of the strength and the conductivity of the copper-titanium alloy, the Co element is added to regulate and control the interface energy of the precipitated phase, the distribution of the precipitated phase is optimized, a multi-step process of discontinuous precipitation aging, cold rolling deformation and continuous precipitation aging is combined, and the strength of the copper-titanium alloy is improved through interface strengthening, precipitated phase strengthening and heterostructure induction strengthening effects. And the comprehensive performance superior to that of the copper-titanium alloy prepared in a conventional mode can be achieved.

The invention relates to the technical field of high-entropy alloys, and discloses a high-entropy alloy with high mechanical property and high corrosion resistance and a preparation method thereof, the high-entropy alloy comprises Fe, Cr, Ni, Al and Si, the atomic ratio of Fe to Cr to Ni to Al to Si is 2: x: 1: 0.2: 0.3, and x is more than or equal to 1.22 and less than or equal to 1.26. Elementary substances corresponding to corresponding elements in the high-entropy alloy are used as raw materials, and the high-entropy alloy is obtained through smelting. The high-entropy alloy has excellent mechanical properties and corrosion resistance and is low in cost, no expensive Co element is added, Fe and Cr elements with relatively low cost are added, and the production cost is reduced.

The invention provides a positive electrode active material, a preparation method thereof, a secondary battery and an electric device. The positive electrode active material comprises a substrate and a coating layer at least partially covering the substrate, and the positive electrode active material satisfies: W1gt, the mass content of the Co element in the W1 coating layer is calculated based on the mass of the positive electrode active material, and the W2 is the mass content of the Co element in the matrix. The positive electrode active material has high discharge capacity per gram, and a material basis is provided for preparing a high-energy-density battery.

The invention provides a polycrystalline Fe-Ni-Co-Al-based superelastic alloy and a preparation method thereof, and belongs to the field of metal materials. According to the preparation method of the polycrystalline Fe-Ni-Co-Al-based superelastic alloy, the strength of an alloy matrix phase is enhanced by properly adding Co, the Co element promotes formation of a high-number-density coherent Ni3Al nanophase, and the Ta element further promotes precipitation of the high-number-density coherent Ni3Al nanophase; the precipitation of NiAl at the grain boundary is inhibited by properly adding B; by combining the composition of the alloy with large-deformation rotary cold rolling deformation and corresponding hot rolling and heat treatment processes, the grain boundary with relatively high texture strength and relatively high and low energy angle grain boundary proportion is prepared; 100 gt; according to the oriented polycrystalline alloy, precipitation of a brittle NiAl phase at a small-angle grain boundary and a coincident lattice grain boundary is inhibited, the overall precipitation number is reduced, and the hyperelasticity of the polycrystalline Fe-Ni-Co-Al-based hyperelasticity alloy is improved.

The invention relates to a 1400 MPa-grade high-cobalt low-tungsten nickel-based alloy for a second-generation high-temperature superconducting baseband and a preparation method of the 1400 MPa-grade high-cobalt low-tungsten nickel-based alloy, and belongs to the technical field of materials. On the basis of the Hastelloy alloy, the Co element with the optimized content is added, solid solution strengthening and TCP phase precipitation restraining are achieved, and the high plasticity of the nickel-based alloy is guaranteed; by increasing the content of Cr, the oxidation resistance of the material is ensured; and the Mo content is reduced, Mo and W elements are promoted to completely enter a matrix in a solid solution mode, no TCP phase precipitation is achieved in the hot rolling process, cracking caused by a residual second phase in the subsequent cold rolling process is avoided, and therefore the preparation technological process of the material is simplified, and the material manufacturing cost is reduced. By adopting the component control strategy, the simplified preparation technology and the heat treatment technology, the nickel-based alloy with the tensile strength being 1400 MPa or above and the elongation being larger than 21.0% can be obtained after annealing is conducted for 5 min at the temperature of 900 DEG C, and the requirement of a second-generation high-temperature superconducting high-performance metal base band is met.

The present invention belongs to the technical field of cemented carbide manufacturing, and discloses a cemented carbide with a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a preparation method thereof. The cemented carbide is composed of a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a hard phase WC. When the molar ratio of the added Co element and the Al element is 1:1 or 3:2, respectively, a cemented carbide with the intermetallic compound CoAl as a bonding phase is obtained. The mixed powder is evenly mixed by ball milling, and then spark plasma sintering is performed to finally obtain a dense cemented carbide with the cobalt-aluminum intermetallic compound CoAl as a bonding phase. The material composition of the present invention is reasonably designed, the preparation process is simple and controllable, the production cost is low, and large-scale industrial production and application are possible.

The application belongs to the technical field of gas sensing material preparation, and discloses an Ag / AgCl modified Co3O4 nano-composite material, a preparation method and application, and comprises the following steps: dissolving inorganic compounds of Ag elements and inorganic compounds of Co elements in deionized water, adding a proper amount of NaCl solution first, then adding N2H4.H2O solution, and obtaining Ag / AgCl loaded alpha-Co(OH)2 nanosheet material by using coprecipitation and in-situ reduction method; and drying and sintering the Ag / AgCl loaded alpha-Co(OH)2 nanosheet material to obtain the Ag / AgCl modified Co3O4 nano-composite material. The application provides a preparation method of a low-temperature high-response gas sensing material, the prepared Ag / AgCl loaded Co3O4 material has higher ethanol gas response performance, can significantly reduce the optimal working temperature of the sensing material, has potential application prospect, and can be used for monitoring alcohol pollutant gases in atmospheric environment, chemical plant environment, home environment and the like.

A positive electrode active material, a preparation method thereof, a secondary battery, and an electric apparatus. The positive electrode active material includes a matrix and a coating layer at least partially covering the matrix. The positive electrode active material satisfies: W1>W2, where W1 is a mass content of Co element in the coating layer, and W2 is a mass content of Co element in the matrix, both based on a mass of the positive electrode active material.

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 discloses copper alloy powder and a method for conducting printing repair on an aluminum bronze workpiece through the copper alloy powder, and belongs to the technical field of alloys and repair of the alloys. The alloy comprises 25-32% of Ni, 12-17% of Co, less than or equal to 1.8% of Mn and less than or equal to 2% of Si. O is less than or equal to 0.03%, and the balance is Cu. By preferably increasing the contents of Ni and Co elements, the wear resistance of the repaired surface and the bonding performance between the matrix and the additive repair layer are improved while the safety in the large-batch preparation and use process of the powder is ensured. The proportion of nickel and cobalt in the alloy is increased, the strength and hardness of the copper alloy can be improved, the nickel and the cobalt hinder dislocation movement in metal lattices through different micromechanisms, in other words, the nickel plays a role through solid solution strengthening, and the cobalt plays a role through precipitation strengthening.

The invention relates to the field of water electrolysis hydrogen production, and discloses a CoZn bimetallic catalyst, a preparation method thereof, a hydrogen evolution electrode and an electrolytic bath. The X-ray powder diffraction pattern of the catalyst has characteristic peaks when 2 theta is 25.94 + / -0.18 degrees, 44.16 + / -0.18 degrees, 51.44 + / -0.18 degrees and 76.26 + / -0.18 degrees; the content of a Co element in the catalyst is 36.3 to 42.7 wt%, and the content of a Zn element in the catalyst is 0.03 to 5.28 wt%; the average particle size of the catalyst is 90-110 nm. The particle size of the catalyst is proper, so that an electrode material with a stable structure can be prepared, and the electrode material is kept constant and stable under a long-time high-current condition. The catalyst with proper size is combined with a proper catalytic layer structure, so that the prepared hydrogen evolution electrode shows excellent activity and efficiency.

This invention discloses a carbon nanotube / ZIF-67 derived Co-C / CNT catalytic membrane, its preparation method, and its application. The method involves acidifying carbon nanotubes to immobilize the growth of ZIF-67 on the carbon nanotubes. ZIF-67 serves as the Co source. The carbon nanotube / ZIF-67 composite material is first acidified, then ground with a eutectic mixture, and finally carbonized. This effectively inhibits the aggregation of Co elements in ZIF-67 during pyrolysis, achieving high dispersion of metal active sites while preventing metal ion leaching. This improves the catalytic activity of the Co-C / CNT catalytic membrane, achieving highly efficient PMS activation, effectively inhibiting the loss of Co active components, and preventing Co degradation. 2+ The problem of secondary heavy metal pollution caused by leaching.

The invention discloses a Ce-doped Co-MOF derived CuO composite oxide catalyst and a preparation method thereof, and belongs to the technical field of catalytic materials. The preparation method comprises the following steps that S1, rare earth waste residues containing Ce elements and Co elements are obtained and treated, and a cerium salt solution and a cobalt salt solution are obtained; s2, the cerium salt solution and the cobalt salt solution are mixed with an organic ligand, and a Ce-Co-MOF precursor is prepared; s3, carrying out calcining and annealing treatment to obtain a Ce-Co-O porous composite oxide carrier; s4, preparing a copper salt solution, impregnating the Ce-Co-O porous composite oxide carrier with the copper salt solution, and then performing drying and calcining treatment to obtain a CuO-coated Ce-Co-O composite oxide; and S5, carrying out surface plasma activation treatment to obtain the Ce-doped Co-MOF derived CuO composite oxide catalyst. According to the invention, high-valued utilization of rare earth resources and precise structural regulation and control of catalytic materials can be realized, and the prepared catalyst can show excellent activity and stability in low-temperature CO oxidation reaction.

Embodiments of the present application provide a martensitic steel and a preparation method therefor, a structural member, and a terminal device. The martensitic steel provided in the embodiments of the present application comprises the Ni element, the Co element, the Mo element, the Nb element, the C element, the Fe element and other trace elements; on the basis of the total mass of the martensitic steel, the mass fraction of the Ni element is 14%-16%, the mass fraction of the Co element is 16%-18%, the mass fraction of the Mo element is 7%-10%, the mass fraction of the Nb element is 0.1%-0.6%, and the mass fraction of the C element is 0.003%-0.1%. On the basis of the element selection of the martensitic steel and the design of the content of each element, the martensitic steel can be prepared by means of a powder molding process such as metal injection molding, and the martensitic steel prepared by means of the described process can have high strength, good toughness, and a preset shape.

This invention relates to the field of battery anode material technology, specifically to Co-Sb composite hard carbon materials, their preparation methods, anode sheets, and applications. The method first combines a Co source and an Sb source to obtain a Co-Sb material. Then, based on the Co-Sb material as a core, organic carbon is deposited and coated, and finally carbonized to obtain the Co-Sb composite hard carbon material. This method is simple and easy to implement. Combining the electrocatalytically active Co element with Sb, and then combining it with carbon materials, is beneficial for the anode material to produce excellent electrochemical performance. As an anode material, this material can improve the problem of limited capacity in anode materials, enhance its reversible capacity, and simultaneously maintain excellent stability and good fast-charge and fast-discharge capabilities during charge-discharge cycles, thereby improving the overall electrical performance of the battery.

The invention provides a high-strength and high-conductivity copper-nickel-titanium-cobalt alloy and a short-process preparation method thereof, and belongs to the technical field of copper-based alloys. The alloy comprises the following components: 2.5%-3.5% of Ni; 0.8% to 1.2% of Ti; 0.3%-0.7% of Co; and the balance of Cu and inevitable impurities. The preparation method comprises the following steps: smelting and casting according to alloy components to obtain a cast ingot; and the cast ingot is sequentially subjected to homogenization treatment, hot rolling, cold rolling and aging treatment, the alloy is obtained, and the solid solution treatment step is omitted. Through microalloying of Co element, precipitation of a nanoscale strengthening phase (Ni, Co) 3Ti is promoted, and formation of an unfavorable phase is inhibited; and meanwhile, a short-flow process without solid solution treatment is adopted, and aging precipitation is directly driven by strain energy introduced by hot rolling and cold rolling. The alloy prepared by the method has high strength, high conductivity and good plasticity, is short in process flow and low in energy consumption, and is particularly suitable for the fields of lead frames in the field of electronic appliances and the like.

The invention relates to a composite chlorine evolution electrode and a preparation method and application thereof, and the preparation method comprises the following steps: placing a titanium-based material as a carrier in an anode, carrying out electro-deposition in a cobalt-ytterbium mixed salt solution, and calcining to obtain the composite chlorine evolution electrode. According to the composite chlorine evolution electrode provided by the invention, the active material simultaneously contains the Co element and the Yb element, the introduced Yb element can generate a synergistic effect with the Co element, the charge distribution around the Co element is adjusted, the conductivity of the composite chlorine evolution electrode is improved, the adjustment of the charge distribution and the improvement of the conductivity jointly optimize a chlorine evolution reaction mechanism, and the catalytic chlorine evolution activity is enhanced; the preparation method disclosed by the invention is simple, quick, green and efficient, low in raw material cost, low in manufacturing cost and suitable for large-scale production, and shows the potential of industrial large-scale application.

The invention provides a Fe-Mn-Al-Ni-based superelastic alloy and a preparation method thereof, and belongs to the technical field of iron-based superelastic alloys. The Co element is added, so that a gamma phase with high number density can be formed, after the gamma phase is heated to an alpha single-phase region, a sub-crystal structure with wide orientation distribution, high average orientation difference and number density is formed in alpha-phase crystal grains, abnormal growth of individual sub-crystals is caused, other sub-crystals in mother crystal grains are completely consumed by the sub-crystals which grow abnormally, and therefore the performance of the alloy is improved. A huge free energy gradient is formed between mother crystal grains and surrounding normal crystal grains with sub-crystals, so that a greater driving force is provided for the growth of abnormal crystal grains, and the growth process of the abnormal crystal grains is greatly shortened; by adding the Mo element, the width of the sub-grain low-density area can be increased, the time that the grain boundary crosses the sub-grain low-density area is prolonged, and therefore the number of abnormal grains is reduced, and the final size of the grains is increased.

The present invention discloses a high-performance sintered NdFeB magnet and a preparation method thereof. The high-performance sintered NdFeB magnet comprises raw materials for preparing the NdFeB magnet, including a main alloy and an auxiliary alloy, wherein the auxiliary alloy does not contain Fe and Co elements; the microstructure of the NdFeB magnet comprises a matrix phase and a rare earth-rich grain boundary phase, wherein the matrix phase is (RE / RE')2(F) 14 B, where F is Fe and Co, the Co content is 0-3, the mass ratio of Fe and RE / RE' in the rare earth-rich grain boundary phase is 1:(1.4-7), RE is Nd or PrNd, and RE' is one or more of Pr, Ho, Dy, and Tb. This NdFeB magnet has high magnetic properties.

The application provides a high-speed steel and a preparation method thereof, and the chemical components of the high-speed steel include the following in percentage by mass: C: 0.86-0.90%, Si: 0.20-0.45%, Mn: 0.20-0.40%, Cr: 7.00-7.50%, W: 5.00-5.50%, Mo: 1.70-2.20%, V: 1.50-1.90%, Co: 0.50-2.00%, and the balance is Fe and impurities. The high-speed steel is designed through alloy components, and through the organic cooperation of W+Mo, the Co element is added to improve the quenching property of heat treatment, the design principle of multi-element compound, and the mechanism of the precipitation and growth of different element carbides in the solidification process, so that the steel has excellent high wear resistance and high corrosion resistance.

The application discloses a Ce-doped Co-MOF derived CuO composite oxide catalyst and a preparation method thereof, and belongs to the technical field of catalytic materials. The preparation method comprises the following steps: S1, obtaining rare earth waste residue containing Ce elements and Co elements, and processing the rare earth waste residue to obtain a cerium salt solution and a cobalt salt solution; S2, mixing the cerium salt solution and the cobalt salt solution with an organic ligand to prepare a Ce-Co-MOF precursor; S3, performing calcination and annealing treatment to obtain a Ce-Co-O porous composite oxide carrier; S4, preparing a copper salt solution, impregnating the Ce-Co-O porous composite oxide carrier with the copper salt solution, and then performing drying and calcination treatment to obtain a CuO@Ce-Co-O composite oxide; and S5, performing surface plasmon activation treatment to obtain the Ce-doped Co-MOF derived CuO composite oxide catalyst. The application can realize high-value utilization of rare earth resources and precise structure regulation of catalytic materials, and the prepared catalyst can exhibit excellent activity and stability in a low-temperature CO oxidation reaction.

The invention relates to a nickel-based single-crystal high-temperature alloy and a preparation method thereof, and relates to the technical field of nickel-based single-crystal high-temperature alloys, and the main technical scheme is as follows: the nickel-based single-crystal high-temperature alloy comprises the following chemical components in percentage by weight: 6-8 wt% of Cr, 7-9 wt% of Co, 2-3 wt% of Mo, 8-9 wt% of W, 5-7 wt% of Ta, 5-7 wt% of Al, 1-2 wt% of Ti, 0-0.05 wt% of C and the balance of Ni; wherein the sum of the percentage contents of the Co element, the W element and the Ta element is A; the sum of the percentage contents of the Mo element and the Cr element is B; wherein A / B is equal to 2.9 to 3.1. The invention mainly provides and prepares a nickel-based single-crystal high-temperature alloy, and the alloy has low gamma / gamma'phase interface energy and good long-term structure stability, and also has high-temperature mechanical properties obviously superior to those of typical second-generation Re-containing single-crystal high-temperature alloys.

The invention discloses a Co-C / CNT catalytic membrane derived from a carbon nano tube / ZIF-67, a preparation method and application, the growth of ZIF-67 on the carbon nano tube is fixed by acidifying the carbon nano tube, the ZIF-67 is used as a Co source, a carbon nano tube / ZIF-67 composite material is acidified firstly, then ground with a eutectic mixture, and finally carbonized, so that the Co element in the ZIF-67 is effectively inhibited from gathering in the pyrolysis process, and the Co-C / CNT catalytic membrane is prepared. According to the Co-C / CNT catalytic membrane, high dispersion of metal active sites is achieved, meanwhile, metal ion leaching is avoided, the catalytic activity of the Co-C / CNT catalytic membrane is improved, the efficient PMS activation effect is achieved, loss of Co active components is effectively inhibited, and meanwhile the problem of heavy metal secondary pollution caused by Co < 2 + > leaching is avoided.

The invention relates to a high-strength and high-plasticity easily-processed nickel-cobalt-based wrought superalloy and a preparation method thereof. The alloy comprises 18%-25% of Co, 11%-16% of Cr, 2.4%-3.4% of Al, 4.5%-6.5% of Ti, 0.8%-2% of W, 1.6%-3.2% of Mo, 0.5%-1.5% of Ta, 0%-1.5% of Nb, 0.001%-0.1% of C, 0.001%-0.05% of B, 0.001%-0.1% of Zr, 0-0.1% of Hf and the balance Ni, and the mass percent ratio of Al to Ti is smaller than or equal to 0.6. The sum of the mass percentages of W and Mo is 3-5%; the sum of the mass percentages of Nb and Ta is 0-2%; the ratio of the mass percent of the Co element to the mass percent of W + Mo is greater than or equal to 4; the ratio of the mass percent of the Al element to the mass percent of Nb + Ta is larger than or equal to 2, and the volume fraction of a gamma'strengthening phase of the high-temperature alloy is 40%-60%. The alloy element distribution in the gamma phase and the gamma'phase is adjusted through the reasonable element proportion, on one hand, the alloy has a large machining interval while the high gamma 'phase volume fraction is kept, and on the other hand, the alloy stacking fault energy is adjusted to make full use of the strengthening effect of the interaction effect of surface defects on the alloy.

The present disclosure relates to a cathode active material, a method of preparing the same, and a lithium secondary battery including a cathode including the cathode active material, the cathode active material including: a transition metal (M) other than a Co element, includes at least one element of W, Mg and Ti, and further includes an S element, a preparation method thereof, and a lithium secondary battery including a cathode including the cathode active material.

The invention provides an interstitial carbon induced light high-strength FCC / B2 eutectic multi-principal-element alloy and a preparation method thereof, and relates to the technical field of novel metal materials. The interstitial carbon induced light high-strength FCC / B2 eutectic multi-principal-element alloy is prepared from the following components in percentage by mole: 17 to 18 at.% of Al, 10 to 13 at.% of Cr, 34 to 37 at.% of Fe, 34 to 37 at.% of Ni, 0.4 to 3.8 at.% of C, 0 to 0.15 at.% of N, 0 to 0.04 at.% of B and 0 to 0.04 at.% of Mn. A small amount or medium amount of carbon element is added into the FCC / B2 multi-principal-element alloy with hypereutectic components, and the eutectic multi-principal-element alloy with abundant microstructures is designed and prepared by utilizing interstitial carbon induced eutectic transformation. The alloy provided by the invention does not contain Co element with relatively high raw material cost, and the density is 1t; 7.2 g / cm < 3 > and the specific strength gt; and the elongation rate can reach 21.3% at most, so that the contradiction among low cost, light weight and high mechanical property of the eutectic multi-principal element alloy is solved.

The application discloses a preparation process of B-Zr doped cobalt-based alloy powder and coating, and the alloy powder is composed of the following components with mass percentage: 90-95% of Stellite6, 1-5% of B and 1-5% of Zr. By introducing appropriate amounts of B and Zr elements into the Stellite6 alloy powder, the Zr and B elements synergistically alleviate the brittle boride to inhibit cracks, and synergistically form fine and dispersed ZrB2 and other stable high-hardness phases, promote the refinement of the structure, improve the hardness of the coating, and prevent B from forming a continuous network of brittle phases. The addition of the B element can also generate intermetallic compounds with Co elements and Cr elements, which have high hardness and high wear resistance, so that the overall strengthening layer hardness is improved. The finally formed high-hardness strengthening layer has a thickness of more than 0.5 mm and no cracks are generated. The hardness of the strengthening layer is more than 1100 HV, and the hardness of the strengthening layer can be more than 2-4 times of the substrate.

The invention discloses a kovar alloy with high tensile ductility and tensile strength and a preparation method thereof. The chemical formula of the kovar alloy is FevNiwCoxAlyTaz, wherein 60 < v < = 70, 40 < w < = 50, 0 < x < = 10, 0 < y < = 10, and 1 < z < = 5. The main element of the preparation method is face-centered cubic Fe-Ni alloy. The Co element is introduced into the solid solution Fe-Ni for chemical regulation and control, the kovar alloy with thermal expansion performance is obtained, but the tensile strength of the face-centered cubic solid solution is low. By introducing a small amount of Al and Ta elements, a coherent (Ni, Fe) 3 (Al, Ta) ordered phase is separated out in a crystal, and then high tensile ductility and tensile strength are achieved. The synthesis steps of the kovar alloy with high tensile ductility and tensile strength are simple and easy to implement, the raw material cost is low, and both the mechanical property and the thermal expansion property of the kovar alloy are achieved.