32results about How to "Effect of diffusion strengthening" patented technology

The invention discloses a method for assisting brazing by a carbon nanotube reinforced type three-dimensional middle layer, and relates to a method for brazing ceramic and metal, which aims at solving the problems of larger residual stress and insufficient high-temperature property in the existing ceramic and metal brazing connection process. The method comprises the following steps of 1, preparing soaked foam metal; 2, putting the soaked foam metal into a plasma reinforced type chemical vapor depositing vacuum device, and increasing temperature at certain pressure and hydrogen atmosphere; 3, preparing nanotube reinforced type foam metal; 4, preparing surface impurity-removed metal, surface impurity-removed brazing material foil and surface impurity-removed ceramic; 5, sequentially overlapping the surface impurity-removed to-be-brazed metal, the carbon nanotube reinforced type foam metal, the surface impurity-removed brazing material foil and the surface impurity-removed ceramic, so as to obtain a to-be-brazed part; brazing the to-be-brazed part, and cooling to room temperature. The method disclosed by the invention is used for assisting the brazing by the carbon nanotube reinforced type three-dimensional middle layer.

The invention relates to a preparation method of a multi-element composite reinforced molybdenum alloy. The preparation method sequentially comprises the following steps that the Mo source, the Ti source, the Zr source, the C source, the Hf source and the Re source are weighed according to a certain weight ratio, the raw materials are prepared and mixed to obtain the uniform molybdenum alloy powder; the molybdenum alloy powder is placed in a mold cavity of a mold and is subjected to compression forming treatment to obtain a forming blank; high-temperature sintering treatment on the formed blank is carried out under vacuum to obtain a sintered blank; forging or rolling deformation processing is carried out on the sintered blank to obtain a forged blank or a rolled blank; and annealing heattreatment on the forged blank or the rolled blank is carried out to obtain the molybdenum alloy plate or a rod material. According to the preparation method, the steps and the process conditions are reasonable in design and good in using effect, the prepared molybdenum alloy material has excellent performance, the tensile strength Ra is greater than or equal to 200 MPa at a high temperature of 1600 DEG C, the percentage elongation after fracture is larger than or equal to 20%, and the oxygen content is less than or equal to 100 ppm.

The invention relates to high-strength weather resisting steel with Cu2-xS dispersed precipitates, which comprises the following chemical components in percentage by weight: 0.04-0.08% of C, 0.20-0.40% of Si, 0.4-1.0% of Mn, 0.03-0.12% of P, not more than 0.2% of S, 0.01-0.06% of Al, 0.20-0.80% of Cu, 0.40-0.6% of Cr, 0.12-0.40% of Ni, 0.001-0.006% of Ca and the balance of Fe and inevitable impurities. The welding cold crack sensitivity coefficient Pcm is not more than 0.18%. A manufacturing method comprises the following steps of: acceleratedly cooling both sides of a cast belt formed by continuous casting by using a gas and adopting a thin belt continuous casting production technology, wherein the cooling rate is 150-200 DEG C / s; performing the entire double-roller continuous casting process in a closed chamber filled with protective atmosphere; and arranging one to two stands for online hot rolling, wherein the thickness of a finished steel belt reaches 0.6-2 mm. The desulfurization procedure in steel making process can be omitted, and the steel making cost is reduced. The segregation of copper elements is inhibited, meanwhile, a large quantity of dispersed Cu2-xS precipitates can be formed to achieve the effect of dispersion strengthening.

The invention belongs to the field of welding, in particular to a Ti 2 The invention relates to a medium-temperature Zr-based solder special for brazing of the same material or different materials of AlNb-based alloys, a preparation method thereof, and a brazing process. In terms of weight percentage, the composition and content of the solder are: Fe 5% to 30%, Nb 1% to 15% or Cu 1% to 20%, choose one of the two, and a small amount of elements Al, B, Co, Cr , one or more of Mn, Mg, Ni, Ag and Zn≤5%, one or more of trace elements Ti, Hf, V, Ta, Mo, W, Au, Si, Sn, Pd, Ga≤ 2%, the rest is Zr element and unavoidable impurity elements. The preparation method of brazing material: 1. Weighing the raw materials; 2. Melting the master alloy of the brazing material; The brazing material of the present invention is brazed according to the brazing process of 960 DEG C to 1030 DEG C and 0 to 120 minutes. Compared with the existing solder, the brazing filler metal prepared by the invention has suitable melting point, excellent wettability and high-temperature mechanical properties, and the brazing filler metal preparation and brazing process are simple.

The invention belongs to the field of metal materials, and particularly refers to a composite thinning and strengthening agent for aluminum and aluminum alloys, a preparation method and a device. First, put pure aluminum in the crucible of the melting furnace and melt it to a certain temperature, make the top of the aluminum melt exceed the upper entrance of the electromagnetic circulation device in the crucible, and add an aluminum alloy covering agent to the top of the crucible, and put the weighed and pretreated Ti , B 2 o 3 , Zr, C powder or shavings are added from the feeding port of the electromagnetic circulation device, and then the electromagnetic circulation device is started, and after a period of cycle reaction compounding, the required compound refinement and strengthening agent are obtained. The composite thinning and strengthening agent prepared by the present invention not only has the characteristics of traditional Al-Ti-B series high-efficiency thinning and Al-Ti-C series long-term thinning, but also contains a large amount of submicron and nanometer TiB 2 , ZrB 2 , TiC, ZrC reinforcement particles, while improving the refinement effect, are finally dispersed in the alloy matrix to achieve the effect of dispersion strengthening.

The invention belongs to the technical field of ultra-fine dispersed precipitated phase high-strength steel and its preparation method, specifically a low V microalloyed ultra-fine dispersed precipitated phase high-strength steel and its preparation method, which solves the technical problems in the background technology, the preparation method In order to obtain steel slabs after mixing the various element components according to the nominal composition ratio, the smelted steel slabs are then processed by conventional heating furnace process or direct rolling process. After the treatment, the steel ingots cooled to room temperature are heated and heated at a certain temperature Holding for a certain period of time allows V to completely dissolve into the steel ingot, and then cooling at a certain temperature and holding for a certain period of time allows V to be completely precipitated, forming V (C, N) uniformly dispersed and fine precipitates to provide low V microalloyed super Fine dispersed precipitate phase high strength steel. This method exerts the precipitation strengthening effect of the V(C, N) precipitates, so that the precipitates can be uniformly dispersed in the matrix to achieve the effect of dispersion strengthening, and prepare high-strength and high-plasticity high-strength steel.

The invention discloses a Cu-containing high-entropy alloy coating with a liquid phase separation structure and a preparation method thereof, belonging to the field of alloy material design. The invention adds a small amount (mass fraction of 0.5-3%) nanometer Y2O3 to the Cu-containing high-entropy alloy composition, which can promote the laser cladding Cu-containing high-entropy alloy coating to form a liquid phase separation structure. The copper-containing high-entropy alloy is composed of 5 or more metal or non-metallic elements, and the content of the Cu element that must be added accounts for 15-35% of the total moles of the high-entropy alloy components. In the present invention, due to the large surface effect and small size effect of nano-Y2O3, it can promote the separation of liquid phase copper from the alloy melt when the laser cladding copper-containing high-entropy alloy coating is fused, and the in-situ self-generation on the solidified matrix structure of the coating A large number of dispersed copper-rich phase particles change the single-phase structure of the coating, providing a new method for designing multi-phase structures and expanding properties of high-entropy alloys through liquid phase separation.

The invention discloses a high-strength and high-conductivity graphene-copper composite wire and a preparation method thereof, which belong to the technical field of composite material processing and heat treatment. In the graphene-copper composite wire, the graphene content is 0.05-0.8wt.%, the total content of impurity elements is ≤0.1wt.%, and the balance is copper. The high-strength and high-conductivity graphene-copper composite wire prepared by the present invention has uniform graphene Dispersed and oriented distributed in the copper matrix, its tensile strength reaches 330-480MPa, elongation 6%-20%, electrical conductivity 95-105% IACS, and has excellent comprehensive performance.