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

The invention relates to the technical field of alloy materials, in particular to a selective laser melting particle-enhanced high-entropy alloy material and a preparation method thereof. Perform powder screening; Step 2: Use the mechanical alloying method to obtain a uniform mixed powder from the high-entropy alloy powder and particle-enhanced powder obtained in Step 1; Step 3: Prepare the mixed powder obtained in Step 2 by selective laser melting (SLM) technology Sample; Step 4: Perform solid solution strengthening and aging treatment on the SLM sample obtained in Step 3. The invention realizes the composition design of the high-entropy alloy by adding an appropriate amount of Ti and Al to the FeCoNiCr high-entropy alloy, and adds Al in the high-entropy alloy. 2 O 3 The strengthening phase and the heat treatment of the sample by selective laser melting can significantly improve the properties of FeCoNiCr high-entropy alloys through strengthening, which is beneficial to prolong the working life of the formed parts and widen the range of working conditions.

The invention provides a welding wire powder flux core, a flux-cored welding wire, its preparation method, application, and an ultra-high-strength steel welding process, and relates to the technical field of welding materials. The welding wire powder flux core includes the following components in weight percentage: Subdivision: high carbon ferrochrome 7‑12%; electrolytic manganese 5‑15%; ferromolybdenum 5‑10%; ferrovanadium 3‑10%; ferrotitanium 1‑5%; %; sodium fluoride 2‑5%; aluminum iron 1‑5%; bismuth oxide 0.3‑0.8%; manganese carbonate 0.4‑1.0%; potassium feldspar 0.4‑2.0%; iron powder balance. The flux-cored material and flux-cored welding wire of the present invention can meet the welding requirements of ultra-high-strength steel with a tensile strength of 1400-1600MPa, and have good welding manufacturability, small spatter, beautiful weld shape, no cracks on the surface, and the formed deposited metal is mechanically Good performance.

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 consumabledouble-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 forthe 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 ingotsare 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 method for high-strength Al-Si casting-forging alloy preparation through microalloying and warm compaction process recombination. On the basis of components of a traditional Al-Si casting-forging alloy, a minute amount of elements including Mg, Cu, Zr and rare earth Sc are added for alloying modification; and casting ingots are obtained through smelting casting and then subjected to warm compaction treatment under the proper temperature and strain rate so as to prepare a high-strength Al-Si casting-forging alloy. Compared with the Al-Si casting alloy produced through a current traditional process, the high-strength Al-Si casting-forging alloy prepared through the method is remarkably improved in performance, the process method adopted for high-strength Al-Si casting-forging alloy preparation is simple and easy to achieve, the production cost is low, very wide production and application prospects are achieved in the field of aviation, spaceflight, car and machinery manufacturing, and the method is suitable for extensive industrialization.

The invention discloses a medium-temperature solder containing copper and a copper alloy. The medium-temperature solder comprises the following components by weight percent: 1-5 percent of silver, 5-8 percent of phosphor, 1-6 percent of tin, 0.1-2.5 percent of silicon, 0.01-0.1 percent of cerium and the balance of copper. The medium-temperature solder disclosed by the invention has the advantages that the melting temperature of the solder is reduced, and the flowability is good; besides, the solder has good permeability and ductility and can infiltrate into a tiny clearance without generating a sand hole; meanwhile, the solder is used in an environment with greater temperature difference, and the damage to a weld seam is avoided. The medium-temperature solder disclosed by the invention is greatly used in the refrigeration industry.

The invention provides a novel high-strength corrosion-resistant rare earth aluminum alloy material and a preparation method. Based on a high-strength Al-Zn-Mg alloy, a proper amount of elements of Cu, rare earth Ce, rare earth Sc and rare earth Er are added, and the novel Al-Zn-Mg-Cu-Ce-Sc-Er aluminum alloy material is prepared. The material has the beneficial effects of being high in strength, good in plasticity and toughness, resistant to corrosion, good in fatigue resistance and the like. The material is a structural material which can be widely applied to aviation, spaceflight, ships and warships and means of conveyance. The production and preparation method of the material is simple and easy to practice, the processing technology of the material is easy to control, raw materials are sufficient and easy to obtain, the production cost is low, and the material has very wide production and application prospects.

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 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 a high-conductivity and high-elasticity palladium-based alloy, heat treatment process and application. The palladium-based alloy includes 40-60wt.% of Pd, 25-45wt.% of Cu, and 5-15wt.% of Ag , 1.5-5wt.% of Ru and 0-2.0wt.% of modifying elements, wherein the modifying elements are one or two of La, Ce, Gd, Y, Ga, Zr and B. The heat treatment process includes the steps of batching, smelting, casting, rolling, annealing, drawing and intermediate annealing. After the intermediate annealing step is completed, the obtained alloy wire needs to be subjected to aging solid solution strengthening treatment. The electrical conductivity of the palladium-based alloy is between 15-25% IACS, the elastic modulus is between 115-125GPa, and the hardness Hv 0.1 Between 360 and 460, the temperature coefficient of resistance is 2.0 to 4.0×10 ‑4 K ‑1 Between, yield strength between 1075 ~ 1125MPa, elongation between 2 ~ 10%. It can be used for brush wires of micro motors, brush wires of potentiometers and semiconductor test probes, wherein the probes can be Cobra probes, cantilever probes, vertical probes or spring probes.

This invention relates to a phase change catalyst for calcining quartz prepares cristobalite and application. A composite phase changes catalyst of prepared cristobalite, which characteristic lie in that it is composed of KCl powder and MoO3 powder composition with mass ratio: 5-10:1-5. the application of the prepared cristobalite composite phase changes catalyst, its feature lie in: the composite quartz powder mixed composite phase change catalyst to get batch, the enter quality of composite phase changes catalyst is 6% - 15% of quartz powder quality; the batch heat on the speed of 2degree centigrade-10degree centigrade per minute to 1300degree centigrade and insulated for six hours, get products of the quartz phase more than 94%. The composite catalyst used for calcining quartz to prepare cristobalite, the transited temperature reduce (1300degree centigrade) from quartz to cristobalite, and its conversion rate is more than 94%, composite phase change catalyst used little.

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.