37results about How to "No recrystallization" patented technology

The invention relates to a sintered gear (1) with teeth (2), between which a tooth base (5) is respectively formed. The tooth base (5) has a surface which is subjected to a thermo-mechanical finishing process and a surface roughness with an arithmetical mean roughness value Ra, measured in accordance with DIN EN ISO 4287, selected fr om a range with a lower limit of 0.2 .mu.m and an upper limit of 2.0 .mu.m.

The invention provides a low-temperature connecting method of a TZM and WRe dissimilar alloy. Ti powder is adopted as an activated middle layer, a TZM alloy and a WRe alloy are subjected to diffusion welding at the temperature lower than the recrystallization temperature of base metal through the spark plasma sintering technology, and a connecting part of the TZM alloy and the WRe alloy is obtained. By means of the welding method, it can be guaranteed that the base metal is not recrystallized, meanwhile, the TZM / WRe dissimilar alloy connecting part high in strength and good in forming is obtained, and the room temperature shear strength of a connector can reach 263 MPa.

The invention provides a functional membrane prepared by using functionalized organic powder, a low-temperature non-damaging manufacturing method and its application. The organic powder membrane material is composed of functionalized organic powder and polytetrafluoroethylene (PTFE). The heated supersonic airflow opens the polytetrafluoroethylene molecular chain, bonds the functionalized organic powder, and extrudes the air in the powder to form a continuous cake. Layer-film hot-pressing composite process forms a low-porosity, uniform-thickness film. This method can continuously roll-to-roll to produce micron-sized organic membranes, which can maximize the physical and chemical properties of organic powders and prevent performance damage or anisotropy caused by recrystallization due to high temperature or introduction of solvents into the film. . No solvent is introduced in the manufacturing process, which avoids the problems of environmental pollution, high energy consumption and uneven density of membrane materials caused by the solvent drying process.

The invention relates to the field of new energy, and discloses a high-energy-density quasi-solid-state sodium-ion battery manufacturing method, which consists of two main processes of prefabricated sodium and positive electrode secondary packaging for removing pre-sodium. The prefabricated sodium process is to form a uniform sodium plating on the surface of porous aluminum foil through the composite sodium ion polyethylene-polyphenylene sulfide-based composite solid electrolyte for single-layer coating pre-sodium under the action of an electric field, so that the nucleation of metallic sodium And grow uniformly, inhibit dendrite generation. The sodium-ion polyethylene-polyphenylene sulfide-based composite solid electrolyte will be tightly bonded to the sodium-storage aluminum-copper negative electrode after prefabrication of sodium, and it is easy to separate from the single-layer coated pre-sodium positive electrode. The sodium is taken out with the positive electrode, which will not cause damage to the inside of the cell, and it is vacuum-sealed for the second time. The battery produced by the method has good flame-retardant properties and good thermal stability, reduces the liquid injection volume of the electrolyte, also reduces combustibles inside the battery, and improves the safety performance of the battery.

The invention belongs to surface treatment technology and relates to an improved method for removing a remelted layer on a monocrystal nickel-base high-temperature alloy surface. The method comprises the following steps of: removing oil from the part surface; preparing a remelted layer removing solution; removing the remelted layer; and cleaning the part. The invention can not cause recrystallization on the monocrystal nickel-base high-temperature alloy surface and ensure that the performance of the part is free from adverse effects. Meanwhile, the invention enhances the work efficiency and reduces the cost.

The invention belongs to the field of polymer materials, and in particular relates to a performed polyimide polymer of two novel phenylacetylene sealed ends and a preparation method thereof. The preparation method is to use diamine 1, 3-di(3, aminobenzene oxyl-4'-formacyl) benzene and triamine 1, 3, 5-tri(3- aminobenzene oxyl-4'-formacyl) benzene respectively with an end-capping reagent - phenylacetylene anhydride to prepare performed polyimide polymer powder of the phenylacetylene sealed ends by the acetone method, the one-step method and the two-step method. The method for preparing the performed polyimide polymer has the advantages of high yield, good quality, high purity and no necessity of performing recrystallization. The performed polyimide polymer of the phenylacetylene sealed ends can be used for preparing high-performance crosslinking materials and has a wide processing window.

The invention belongs to the technical field of welding, in particular to a Ni 3 High performance brazing method for Al-based single crystal alloys. A new type of high temperature resistant Ni-Cr-W-Mo-Si solder was applied and a suitable for the solder and Ni 3 The brazing process of Al-based single crystal alloy mainly includes the steps of pre-welding cleaning, assembly positioning, presetting solder, vacuum brazing, and post-welding heat treatment. Using the solder and technology used in the present invention can obtain excellent brazing joint structure, the brazing seam and the base metal interface are well combined, and the brazing seam has no welding defects and low melting point phases simultaneously, and the Ni brazed according to the technology 3 Al-based single crystal alloy brazed joints have high mechanical properties that meet the requirements of use.

A process for preparing high-purity pentazolol features the reaction between 1-(4-chlorphenylethyl)-1-tert-butyl-1, 2-epoxy ethane and 1,2,4-triazole in organic polar solvent under existence of alkali while adding catalyst chosen from N,N-dimethyl-4-aminopyridine, N,N-dimethylphenylamine, methylphrrolidone, dimethyl formamide, methanol sodium, ethanol sodium, potassium hydroxide and sodium hydroxide. Its advantages are high output rate and high purity.

The invention provides a low-damage processing method of film holes in a single crystal high-pressure-turbine hollow blade of an aircraft engine. The low-damage processing method comprises the following steps: wiping the surface of the blade through degreasing cotton with absolute alcohol; transferring into a drying box to dry; arranging a clamp on a machine table, and aligning; assembling the dried blade on the clamp and locking; presetting scanning system parameters; scanning the blade; saving axis moving coordinate value of each hole to be processed under an automatically-generated machine coordinate system as a *.xls file; importing and generating a hole position file; performing compensative correction on the deviation value of a focus position of the hole to be processed; and setting the optimized laser processing technological parameters through a main processing interface. With the adoption of the low-damage processing method, the processed hole is outstanding in quality; a remelting layer, microcacks and recrystallization can be avoided after the single crystal material is processed, so that subsequent processing can be saved, and as a result, the fatigue life and the processing cycle of the blade can be prolonged and improved; the ablation threshold of the single crystal material can be effectively reduced; the recrystallization of the single crystal material can be avoided.

The invention relates to the technical field of connection of heterogeneous materials and particularly relates to a tungsten copper module for a high thermal load part of a fusion device as well as a preparation method thereof. The method comprises the following steps: 1) selecting tungsten, anaerobic pure copper and a chromium zirconium copper alloy heat sink material in appropriate size; 2.1) pre-treating surfaces of tungsten and anaerobic pure copper; 2.2) carrying out vacuum-casting on the anaerobic pure copper on the surface of tungsten; 3.1) pre-treating the surface of the anaerobic pure copper in a tungsten / anaerobic pure copper block and a to-be-welded face of a chromium zirconium copper alloy; 3.2) welding the tungsten / anaerobic pure copper block and the chromium zirconium copper alloy in a vacuum hot pressed furnace; and 3.3) machining a welded tungsten / anaerobic pure copper / chromium zirconium copper alloy compound block to form the required tungsten copper module. The preparation method of the tungsten copper module is low in cost, high in efficiency and high in reliability and the tungsten copper module can bear a steady state thermal load which is greater than 5MW / m<2>.