31results about How to "Grain boundary refinement" patented technology

The invention relates to a titanium alloy laser cladding surface reinforcing method which comprises the following steps: mixing the following components by weight: 50-100% of Co42 cobalt-based self-fluxing alloy powder, 0-50% of B4C0, 0-50% of SiC, 0-39% of TiN, 0-1.5% of Y2O and 0-1.5% of CeO2, uniformly blending the mixture powder into paste by using a sodium silicate solution, uniformly coating the paste mixture powder on the surface of a titanium alloy, keeping the coating uniform in thickness, drying in air naturally, and performing laser cladding on the coating on the surface of the titanium alloy. By the adoption of the method provided by the invention, the microstructure of a cladding layer can be improved, and the hardness and the wear-resistance of the cladding layer can be further improved.

The invention provides a co-based high elastic alloy. The chemical components (by weight percentage) are as follows: Co, 38 to 42 percent; Ni, 14 to 17 percent; Cr, 18 to 22 percent; Mo, 3 to 7 percent; W, 4.0 to 6.5 percent; Si, less than 1.0 percent; Mn, less than 2.5 percent; Nb, less than 1.0 percent; Zr, less than or equal to 0.5 percent; B, less than 0.1 percent; C, less than 0.12 percent; S, less than 0.004 percent; P, less than 0.02 percent; the rest, Fe. The invention also provides a manufacturing method of the co-based high elastic alloy, namely, vacuum melting and vacuum consumable double-vacuum melting technology; wherein, the thickness of an ultrathin strip material of the co-based high elastic alloy which contains the components is 0.02 to 0.05mm. The manufacturing method for the ultrathin strip material of the co-based high elastic alloy comprises the following steps: after cold rolling and blank material preparation as well as solution treatment, self-consumable ingots are rolled coldly into thin strips by certain cold processing technique; the performance of the thin strips is improved by ageing heat treatment in reducing atmosphere or high vacuum; finally, the ultrathin strip material of the co-based high elastic alloy is obtained with the thickness of 0.05mm plus or minus 0.002mm, high accuracy and high performance. The ultrathin strip material of the co-based high elastic alloy made according to the invention not only has the advantage of good mechanical and physical property but also has the advantages of thin thickness, high accuracy and good consistency when processed into elastic elements.

The invention discloses a wear-resistant white cast iron material, which consists of the following elements in percentage by weight: 2.2 to 3.2 percent of C, less than or equal to 1.2 percent of Si, 2.0 to 3.5 percent of Mn, 7.0 to 10.0 percent of Cr, 0.2 to 1.2 percent of Cu, 0.06 to 0.3 percent of V, 0.02 to 0.15 percent of Ti, 0.001 to 0.003 percent of B, 0.02 to 0.06 percent of Al, 0.02 to 0.15 percent of RE, less than or equal to 0.06 percent of S, less than or equal to 0.06 percent of P, and the balance of Fe. The wear-resistant white cast iron material has the hardness (HRC) of more than or equal to 56, the impact toughness aK of more than or equal to 6J/cm<2>, and a metallographic structure consisting of martensite, carbide (M7C3+a small amount of M3C), secondary carbide and a small amount of retained austenite. The wear-resistant white cast iron material does not contain noble metals such as molybdenum, nickel and the like; and compared with the traditional medium-chromium cast iron material, the wear-resistant white cast iron material has the advantages that the production cost can be greatly saved and the material has good economic benefit.

The invention designs low-cost high-temperature carburizing steel for a high-temperature carburizing environment with a temperature higher than 1000 DEG C. The low-cost high-temperature carburizing steel consists of the following chemical components in percentage by weight: 0.16-0.20% of C, less than or equal to 0.04% of Si, 0.75-0.90% of Mn, 1.15-1.25% of Cr, 0.20-0.30% of Mo, 0.040-0.050% of Al,0.0120-0.0180% of N, less than or equal to 0.025% of P, 0.015-0.025% of S, less than or equal to 0.0010% of O and the balance of Fe and inevitable impurities. An Al/N ratio is controlled to be 2.0-4.0, Si content is controlled to be relatively low, and a deoxidation process in steelmaking and a stopper rod curve control process in continuous casting are combined, so that large-scale production and continuous casting can be realized, extra process treatment does not need to perform before high-temperature carburizing, a steel structure before carburizing does not need to strictly control and the process is greatly simplified. Grade of a B-class rough system, fine system impurities and Ds impurities of high-temperature carburizing steel is lower than 0.5, carburizing can be simulated for 2-6 hours at a temperature of 1000-1030 DEG C and mixed crystal is avoided. The carburizing steel can be effectively guaranteed in fatigue life after being applied to parts such as a gear.

The invention relates to a method for carrying out anatonosis by adopting laser plasma impact waves in a chemical heat treatment process. According to the method, induction to generate plasma impact waves are generated by induction with high-power short-pulse laser, act on materials and are combined with chemical heat treatment, thereby improving the surface property of metal materials and members and enhancing the oxidation resistance, abrasion resistance and corrosion resistance of the metal material and the members, wherein the chemical heat treatment can be alumetizing, carburization, nitridation, aluminum-chromium penetration and the like. The method disclosed by the invention has the beneficial effects that the temperature of the chemical heat treatment in order to obtain identical penetration layer depth, the temperature of the chemical heat treatment can be obviously reduced, and the treatment time is shortened, thereby reducing the deformation of workpieces.

The invention discloses special copper alloy powder for a laser-sensing composite fusion-covering high-strength high-conductivity copper alloy coating, and the alloy powder comprises the following chemical components: 2 to 5 percent by weight of titanium (Ti); 1 to 3 percent by weight of magnesium (Mg); 0.1 to 0.5 percent by weight of Zirconium (Zr); 0.2 to 1 percent by weight of boron (B); 5 to 10 percent by weight of aluminum (Al); 8 to 15 percent by weight of nickel (Ni); 0.8 to 2 percent by weight of niobium (Nb), 3 to 8 percent by weight of tungsten (W); 0.01 to 0.5 percent by weight of hafnium (Hf); 0.05 to 0.5 percent by weight of scandium (Sc); and balance of copper (Cu). The special copper alloy powder has the advantages that the special copper alloy powder has good technical compatibility with technical characteristics of the laser-sensing composite fusion covering, a crack-free copper alloy coating with high wearing resistance, high conductivity and excellent high-temperature flexibility can be prepared under a high efficient condition, the effective balance and combination of high strength and high conductivity of the copper alloy can be realized, and the special copper alloy powder has wide application prospect in the fields such as surface enhancing and repairing for copper crystallization rollers, copper crystallizers and electromagnetic gun rails.

The invention discloses an abrasive-wear-resistant rare-earth-containing Ni-Cr-Fe alloy powder material and application thereof. The abrasive-wear-resistant rare-earth-containing Ni-Cr-Fe alloy powder material comprises the following components in percentage by weight: 2.0%-3.0% of C, 3.0%-4.0% of B, 2.5%-3.5% of Si, 18%-20% of Ni, 16%-18% of Cr, 0.3%-0.5% of Ce and Fe in balancing amount. Rear earth is added into the powder material, so that the performance of the powder material is improved, and the content of a precious metal in powder material is reduced to lower the cost of the powder material; owing to the addition of rear earth, the hard phase in a coating structure is distributed uniformly, the binding force between the coating structure and a matrix is enhanced, the coating structure is hindered from stripping during an abrasive wear process, and the abrasive-wear resistance of the coating structure is improved; and problems about surface protection and workpiece repair of large-scale equipment and key parts are solved, the cost is saved, and economic benefits are created.

A preparation method for a silver stannic oxide wire includes the steps of uniformly mixing prepared AgSn (silver-stannum) powder and SnO2 (stannic oxide) powder with additives, wherein the additives optionally comprise one or more of CuO (cupric oxide), GeO2 (germanium dioxide), Dy2O3(dysprosium oxide), WO3 (tungsten trioxide), WC (tungsten carbide) and W (tungsten); then placing the mixed powder into an aerobic environment; pressing the oxidized powder into a spindle by an isostatic press under the pressure; sintering the spindle at the high temperature; extruding the sintered spindle into a wire and drawing the extruded wire into the wire with the corresponding diameter. Silver stannic oxide particles prepared by the method are fine and uniform in metallographic structures, the types of the additives are unlimited, and processability, rivet forging performance and electrical performance of the materials are improved.

The invention discloses a high-conductivity high-elasticity palladium-based alloy, a heat treatment process and application. The palladium-based alloy comprises, by mass, 40-60 wt.% of Pd, 25-45 wt.%of Cu, 5-15 wt.% of Ag, 1.5-5 wt.% of Ru and 0-2.0 wt.% of modified elements, wherein the modified elements are one or two of La, Ce, Gd, Y, Ga, Zr and B. The heat treatment process comprises the steps of carrying out burdening, carrying out smelting, carrying out casting, carrying out rolling, carrying out annealing, carrying out drawing and carrying out intermediate annealing, and after the intermediate annealing step is completed, aging solution strengthening treatment needs to be carried out on a prepared alloy wire. The conductivity of the palladium-based alloy ranges from 15% to 25%IACS,the elasticity modulus ranges from 115 GPa to 125GPa, the hardness Hv0.1 ranges from 360 to 460, the resistance temperature coefficient ranges from 2.0 to 4.0x10<-4>K<-1>, the yield strength ranges from 1075 MPa to 1125MPa, and the ductility ranges from 2% to 10%. The high-conductivity high-elasticity palladium-based alloy can be used for a micromotor electric brush wire, a potentiometer electricbrush wire and a semiconductor test probe, wherein the probe can be a Cobra probe or a cantilever type probe or a vertical type probe or a spring type probe.

The invention provides a strengthened coating on the surface of a transmission component of an agricultural machine. The strengthened coating comprises the following raw materials in parts by weight:10-13.5 parts of high entropy alloy powder, 31-40 parts of hard alloy powder, and 46.5-59 parts of shape memory alloy powder. A preparing method comprises the following specific preparing steps of atfirst, separately grinding the nickel-base high entropy alloy powder, the hard alloy powder and the shape memory alloy powder in fine powders by a ball grinding mill; and then mixing the three alloy fine powders, adding an organic binding agent, sufficiently and uniformly mixing at a room temperature, smearing and heating, thereby obtaining the strengthened coating. The high entropy alloy powder,the hard alloy powder and the shape memory alloy powder are smashed, and are uniformly bound together by the organic binding agent, wherein the hardness of high entropy alloy and the hardness of hardalloy are higher, the high entropy alloy and the hard alloy are mainly used for improving the wear resistance of the transmission component of the agricultural machine, however the shape memory alloyis added to facilitate improving the toughness of the coating and prevent brittle rupture and falling of the coating due to too hard high entropy alloy and hard alloy, so that the service life of thetransmission component of the agricultural machine is effectively prolonged.

The invention relates to a high temperature resisting high-conductivity iron-base alloy material suitable for the technical field of electrometallurgy and electrochemistry, in particular to high-temperature and high-conductivity iron-base alloy. The high-temperature and high-conductivity iron-base alloy is characterized in that the high-temperature and high-conductivity iron-base alloy is prepared from, by weight, 1%-30% of Cu, 0.1%-0.5% of rare earth metal, 0.1%-5% of one or two of Mo and W, 0.1%-5% of one or two of Ni and Co, 0.1%-1% of at least two of Al, Mg, Ca and Zn, 0.035% of impurities C, S and P or less and the balance iron, and the sum of the chemical composition contents is 100%. The high-temperature and high-conductivity iron-base alloy has the beneficial effects of being good in conductivity, small in expansion coefficient, excellent in mechanical performance and resistant to corrosion.

The invention provides a high-conductivity copper-cobalt alloy for an electrode and a preparation method of the high-conductivity copper-cobalt alloy. The high-conductivity copper-cobalt alloy comprises, by weight, 0.1%-1% of Be, 1.2%-2.8% of Co, 0.5%-1.7% of Ni, 0.1%-0.5% of Zr and the balance Cu. The preparation method comprises the following steps that S1, burdening is conducted according to the weight percentage of all the components, S2, the temperature of a smelting furnace is increased to a certain temperature, Be, Co, Ni and Zr are added, S3, the temperature of the smelting furnace continues to be increased to a certain temperature, Cu is added, and alloy liquid is obtained after smelting is completed. Through the mutual strengthening effect between the alloys, the conductivity of the copper-cobalt alloy is improved. And meanwhile, through strict performance detection, the copper-cobalt alloy has good conductive performance and relatively high mechanical performance, room-temperature performance, high-temperature performance and wear resistance.

The invention relates to the technical field of alloy materials for high-temperature-resistant pump valves, and discloses an alloy material for a high-temperature-resistant pump valve. The alloy material comprises the following raw materials in percentage by weight: 2.65-3.0% of C, 0.5-0.8% of Si, 0.5-0.8% of Mn, 24.0-28.0% of Cr, 0.9-1.2% of Mo, 0.6-0.9% of W, 0.9-1.2% of Cu, 0.3-0.5% of V, 0.06-0.15% of Ti, 0.04-0.12% of RE, 0.04-0.06% of S, 0.04-0.06% of P, 0.3-0.4% of a refining agent, and the balance of Fe and unavoidable impurities. According to the alloy material for the high-temperature-resistant pump valve and a production process of the alloy material, Mo and W alloys and strong carbide forming elements such as V and Ti are added for compound use, V and Ti are the strong carbideforming elements, grains are refined, grain boundaries are purified, the form, size, number and distribution of carbide are improved, the effect of improving the comprehensive performance of the material is very obvious, and the high-temperature stability and red hardness of carbide are better, so that the pump valve shows higher wear resistance and high-temperature resistance in a high-temperature operation environment.

The invention relates to a machine body aluminum cast support. The machine body aluminum cast support comprises a base, a frame and a brace, wherein the upper part of the base is an isosceles trapezoid while the lower part of the base is a rectangle; the length of the rectangle is equal to that of the bottom of the trapezoid; the frame is fixed on the base and is formed by combining three side surfaces; an included angle between each two adjacent side surfaces is 120 degrees; the brace is inlaid on the frame; the lower part of the brace is a rectangular cylinder structure; and the upper part of the brace is a first cylinder structure which is placed horizontally. The machine body aluminum cast support is reasonable in design, high in hardness and simple and convenient to mount. Moreover, the base, the frame and the brace of the machine body aluminum cast support are made of three-dimensional weave fiber/aluminum alloy composite materials, so that the machine body aluminum cast support which is excellent in overall performance, light in weight and low in cost can be obtained.