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

The invention discloses a wear-resisting and high-hardness flux core wire. The wear-resisting and high-hardness flux core wire is composed of a flux core and a low-carbon cold-rolling steel tape sheath wrapped on the outer side of the flux core. The flux core comprises, by weight, 20-25 parts of low-carbon ferrochromium, 1.5-3 parts of titanium powder, 1-2 parts of nickel powder, 5-8 parts of calcium-silicon alloys, 2-4 parts of magnesium-aluminum alloys, 3-5 parts of electrolytic manganese, 1-2 parts of ferromolybdenum, 2.5-4 parts of ferroniobium, 1-2 parts of ferrovanadium, 3-5 parts of rare earth iron alloys, 3-5 parts of carbonate, 3-4 parts of graphite, 120-150 parts of iron powder, 0.5-1.5 parts of tungsten powder and 2-4 parts of calcium fluoride. The wear-resisting and high-hardness flux core wire has good welding performance, deposited metal tissue is compact, air holes and cracks are avoided, combination with base metal is good, performance is stable, and deposited metal has good wear resistance, corrosion resistance, high hardness and other performance.

The invention discloses a high-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy. The high-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy comprises the following chemical components in percentage by mass: 10.8%-13.6% of Gd, 4.0%-4.6% of Y, 1.8%- 2.2% of Zn, 0.4%-0.6% of Zr and the balance of magnesium and inevitable impurity elements. The invention further discloses a preparation method of the high-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy. The preparation method sequentially comprises the following steps: (1) preparing a magnesium alloy cast bar; (2) homogenization of the bar: heating the magnesium alloy bar and preserving heat by adopting a grading homogenization system, then heating and reheating, preserving heat and carrying out homogenization treatment; and (3) upsetting-extruding composite deformation: putting the bar into a heated upsetting-extruding composite die, and obtaining a high-toughness deformed-state heat-resistant rare-earth magnesium alloy material after multiple times of circulating upsetting-extruding; (4) solid solution and aging treatment: adopting solid solution and aging treatment for heat treatment, and preserving heat, and quenching by adopting hot water after discharging; and after cooling to room temperature, aging and preserving heat. The magnesium alloy prepared through the preparation method is high in quality, and particularly can keep high mechanical performance at a temperature of 300 DEG C.

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 discloses a novel nano-particle reinforced active tungsten argon arc welding method, and belongs to the active welding technology. The method is characterized by comprising the following steps of: before welding, mixing oxide activator powder and nano ceramic particles in proportion, and then adding acetone into the mixture so that the mixture is in pasty; then uniformly coating the pasty activator on the surface of samples by a flat brush, wherein the coating width is about 40mm, and the average coating amount is 5.mg.cm<-2>; and carrying out tungsten argon arc welding after the acetone is volatilized. The external waviness of the welding joints obtained by adopting the nano-particle reinforced active tungsten argon arc welding is smooth; compared with the welding joints obtained by the traditional tungsten argon arc welding, the fusion depth is increased by 110%; the crystal particles of the welding joint fusion region are obviously reduced compared with the active tungsten argon arc welding; and the tensile property of the welding joint is improved by 64.6% compared with the active tungsten argon arc welding. The problems that the tungsten argon arc welding fusion depth of magnesium alloy is shallow and the crystal particles of the active tungsten argon arc welding are thick are solved.

The invention discloses a Cu-containing high-entropy alloy coating with liquid phase separation tissue and a preparation method thereof, and belongs to the field of alloy material design. According to the invention, a small amount of nano Y2O3 (mass fraction of 0.5-3%) is added to the Cu-containing high-entropy alloy composition, and can promote laser cladding of the Cu-containing high-entropy alloy coating and formation of liquid phase separation tissue. The Cu-containing high-entropy alloy is composed of five or more metallic or non-metallic elements, and the compulsory Cu element accounts for 15-35% of the total moles of the high-entropy alloy composition. The nano Y2O3 has a large surface effect and small size effect, can promote separation of liquid copper from the alloy melt in the laser cladding of Cu-containing high-entropy alloy coating; and a large number of copper-rich particles in dispersed distribution grow in situ on the coating solidified matrix tissue, thus changing the single-phase structure of the coating, and providing a novel method for designing complex phase tissue and expanding capability of the high-entropy alloy by liquid phase separation.

The invention provides a nano TiB2 reinforced aluminum-based composite material prepared through selective laser melting and a method thereof. The method comprises the following steps of (1) selecting high-purity spherical AlSi10Mg powder with the purity greater than 99.9% and a particle size of 15-53 microns, and irregular structure TiB2 powder with the purity greater than 99.9% and a particle size of 50-100 nm, (2) mechanically mixing the two kinds of powder, and uniformly mixing the two kinds of powder under the condition that the original characteristics of matrix powder are not damaged; and (3) preparing a high-density composite material forming sample with reinforced phase particles uniformly distributed on an aluminum alloy matrix by adopting a selective laser melting forming technology. By adding the nano-reinforced particles into the aluminum alloy matrix, the comprehensive mechanical properties of the aluminum alloy can be effectively improved under the synergistic strengthening action of fine grain strengthening and dispersion strengthening.

The invention discloses a preparation method of an Al-Zn-Mg-Cr-Mn-Zr-Er medium-strength and high-toughness aluminum alloy plate. The Al-Zn-Mg-Cr-Mn-Zr-Er medium-strength and high-toughness aluminum alloy plate is prepared from the alloy components: 3.0-4.0% of Zn, 1-2% of Mg, 0.2-0.4% of Mn, 0.1-0.3% of Cr, 0.1-0.3% of Zr, 0.1-0.3% of Er, 0.1-0.5% of Si, less than 0.01% of Cu and the balance of Aland other impurities, and the content of single impurity is not more than 0.1%. The preparation process includes the steps that an alloy prepared according to the composition design is smelted, casted and poured into an ingot with a diameter of 300 mm to 500 mm, the temperature is directly raised to 460 DEG C without homogenization heat treatment after stress relief annealing of the ingot is completed at 220 DEG C to 300 DEG C, after temperature is kept for 3 to 6 hours, hot extruding is carried out, and an aluminum alloy plate with a thickness of 6 to 10 mm is prepared under the condition that the extrusion ratio exceeds 16, wherein the extruded aluminum alloy plate has the tensile strength of more than 350 Mp, the yield strength of more than 300 Mp, the elongation of more than 15% and the ISSRT of less than 0.03 at normal temperature after solid solution aging treatment.

The invention discloses a high-tenacity anti-cracking aluminum alloy welding stick. The high-tenacity anti-cracking aluminum alloy welding stick comprises components including, by mass percent, Mg, Be, Si, Mn, Cr, Cu, Ti, Sr, Mo, W, V, Nb, Zr, Nd, Sc, Ce, Eu, Y and the balance Al and inevitable impurities. The provided high-tenacity anti-cracking aluminum alloy welding stick is reasonable in formula, arc stability is good, welding line forming is attractive, strength is high, low-temperature resistance and impact resistance are good, the bonding strength between the welding stick and a mother material is large, and performance is stable.

The invention discloses a high-plasticity high-strength cast aluminum alloy containing nickel and copper and a preparation method of the high-plasticity high-strength cast aluminum alloy. The alloy comprises the following components in percentage by weight: 3.0%-6.0% of Ni, 0.01%-2% of Cu, 0.2%-1.0% of Ce, 0.2%-0.7% of Mn, 0.01%-0.04% of Ti and less than 0.2% of Fe, with the balance being Al and other inevitable impurities. According to the preparation method, nickel is added, so a fine and dispersed columnar Al3Ni phase can be formed on a matrix, and dispersion strengthening effect is achieved; a second phase can be refined by adding Ce; and meanwhile, Ce and Cu can be combined in a matrix to form fine precipitated phases which are distributed in a dispersed mode, so dislocation is effectively pinned, and strength is improved.

The invention discloses a low-impedance high-strength illuminating bus slot, and relates to the technical field of electrical equipment. The bus slot comprises an upper cover plate, a lower cover plate, two side plates and a bus. A bus containing cavity is defined by the upper cover plate, the lower cover plate and the two side plates, the bus is arranged in the bus containing cavity, and the upper cover plate, the lower cover plate and the two side plates are each prepared from, by mass, 0.35-0.68% of C, 2.26-2.52% of Cr, 0.95-1.18% of Si, 0.66-0.73% of Zn, 2.34-2.58% of Cu, 0.13-0.18% of W,0.35-0.52% of Mn, 0.93-1.27% of Mg, 1.56-1.88% of rare earth elements and the balance Al and inevitable impurities. The strength of the low-impedance high-strength illuminating bus slot is higher thanthat of an existing bus slot, the bus impedance is low, energy can be saved, heat emitted during bus working is reduced, and the service life of the bus slot is effectively prolonged.

The invention discloses a diesel engine valve coating technology. The diesel engine valve coating technology comprises the steps of pretreatment before coating and plasma cladding treatment. The diesel engine valve coating technology specifically comprises the following process that the portion, needing to be coated, of a diesel engine valve is soaked in an activating solution, cleaned and dried; mixed powder is uniformly applied to the surface of the portion, needing to be coated, of the diesel engine valve obtained after pretreatment before coating, plasma cladding treatment is conducted, cooling is conducted, a material A is obtained, and then heat treatment is conducted. According to the diesel engine valve coating technology, a coating material and a substrate are combined closely and distributed uniformly through the optimized technology, therefore, the high temperature resistance, the corrosion resistance and the fatigue resistance of the diesel engine valve are effectively improved, ad the service life of the diesel engine valve is effectively prolonged.

The invention discloses a method for improving strength and conductivity matching of a copper-based composite material based on an in-situ reaction. The method comprises the steps that firstly, graphene oxide powder and chromium-containing copper-based alloy powder are taken as raw material powder, and the raw material powder is uniformly mixed in a grinding manner to obtain mixed powder; and secondly, the mixed powder obtained in the first step is subjected to plasma sintering, so that the mixed powder generates the in-situ reaction, and the copper-based composite material with strength and conductivity matched is obtained through cooling. Graphene oxide is used as a reinforcing phase, a chromium-containing copper-based alloy system is used as a matrix, through grinding and plasma sintering, carbon atoms in the graphene oxide and chromium in the chromium-containing copper-based alloy are subjected to the in-situ reaction to form chromium carbide, the chromium carbide and the alloy matrix form a coherent or semi-coherent interface, the interface strength between the graphene oxide and the chromium-containing copper-based alloy is improved, and meanwhile the prepared copper-based composite material keeps good conductivity in combination with high dispersion of the graphene oxide in the alloy matrix.

The invention discloses oxide-reinforced low-activation steel, an electroslag remelting slag system and a smelting method. The electroslag remelting slag system comprises slag A and slag B, the slag Acomprises the following components including, by mass, 40-55 parts of CaF2, 30-35 parts of Y2O3 and 20-30 parts of CaO, the slag B comprises the following components including, by mass, 55-65 parts of CaF2, 30-40 parts of CaO, 2-5 parts of MgO and 3-7 parts of SiO2; in the smelting process, a blind hole is machined inwards from the end face of the upper end of a consumable electrode, the blind hole is filled with yttrium, the upper end of the consumable electrode is welded to a fake electrode, the consumable electrode is fixed to a smelting position, the slag A is added into a water-cooling crystallizer, and arcing slagging is conducted; and smelting is started after arcing, the slag B is added after smelting to a designated position of the consumable electrode, smelting continues to be carried out until smelting is finished, and the designated position is a horizontal position corresponding to the bottom of the blind hole in the consumable electrode. The electroslag remelting slag system does not contain Al2O3, the smelting method can fully utilize the electroslag remelting slag system, the yield of Y is increased, and the new oxide-reinforced low-activation steel is obtained.

The invention discloses an aluminum alloy material for a high-strength and high-toughness glasses frame. The aluminum alloy material comprises the following chemical components: Si, Fe, Cu, Mn, Mg, Cr, Zn, Zr, RE, Ti and the balance Al. A preparation method comprises the following steps of: heating and melting the prepared high-strength and high-toughness aluminum alloy raw material, performing purification treatment, and casting the melt into a cast ingot for subsequent processing. The aluminum alloy material disclosed by the invention is an Al-Zn-Mg-Cu alloy, the alloy strength and toughness are maximized by optimizing the alloy component design, the produced cast ingot is uniform in component at each position and small in internal stress, stress relief annealing is not needed, and due to the addition of transition group elements Zr and lanthanide elements (La and Ce), the microscopic grain structure is refined, and the strength and toughness of the alloy are improved.