42results about How to "Achieve solid solution strengthening" patented technology

The invention discloses novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel and a preparation method thereof. Aluminum high-speed steel prepared by the preparation method adopts a novel powder metallurgical high-speed steel direct preparation process to lead in (0.05-5.0) AlN micro powder, and a material mixture is subjected to processes such as wet-milling, pelletizing, isostatic cool pressing and forming, hydrogen gas deoxidizing, hot-pressing composite sintering and vacuum thermal treatment, so that micro-level dispersion distribution of aluminum nitride particles is realized, and therefore, the defects that a conventional casting process easily generates a ledeburite structure, an aluminum nitride strengthening phase is difficulty led in by agas-atomizing-hot isostatic pressing method, and the like are overcome. The novel aluminum nitride dispersion strengthening powder metallurgical aluminum high-speed steel is short in process flow, islow in production cost, is low in impurity content, is high in compactness, and is remarkably improved in wear resistance, oxidization resistance and a micro structure after aluminum nitride is led in, and is novel mould material among conventional high-speed steel, a hard alloy and a ceramic material.

The invention discloses an aluminum-based material. Aluminum nitride, zirconium oxide and tantalum oxide particles are uniformly distributed in an aluminum alloy substrate, MoS2, Al2O3 and SiC are distributed on part of a surface layer of the aluminum alloy substrate, the hardness of aluminum nitride, zirconium oxide and tantalum oxide is high, the hardness and wear-resisting performance of the substrate are significantly improved, and fluorinated graphite powder can improve the anti-friction property. The surface of the substrate is coated with a Mn-Cr coating in a fusion mode to effectivelyimprove the wear-resisting performance and corrosion resistance of the alloy surface. The dispersion strengthening of strengthening phases of Si, Cu, Cr, Ni, Hf, Fe, Ag, Ca, Li, Ba and other elementsin the alloy improves the mechanical properties of the material. A preparation method enables mixed powder to be located in the center of a master alloy solution during casting through a method by adhering the mixed powder to a pure aluminum metal wire, the rapid diffusion and homogenization of micro powder particles is facilitated, the production efficiency is improved, wear-resistant materials are locally added by friction stir machining, and the material utilization ratio is improved.

The invention relates to a multi-component alloy cast iron preparation method, which is characterized by comprising: carrying out smelting of hot metal in an electric furnace, wherein hot metal comprises the following chemical components, by mass: 3.05-3.45% of C, 0.75-1.05% of Mn, 1.10-1.35% of Si, 0.03-0.07% of N, less than 0.06% of S, less than 0.08% of P, and the balance of Fe and inevitable trace impurities; discharging out of the electric furnace when the hot metal temperature is 1450-1480 DEG C; adding an inoculant along with the hot metal flow during the hot metal discharging process, wherein the amount of the inoculant is 0.8-1.2% of the mass of the hot metal; adding alloy wires into the hot metal by using a wire feeding machine after the hot metal enters a hot metal ladle, wherein the alloy wire addition amount is 2.5-3.5% of the mass of the hot metal in the hot metal ladle, and the size of the alloy wire is phi 2.5-4.0mm; carrying out pouring casting molding on the hot metal when the hot metal temperature is reduced to 1335-1370 DEG C; and opening the box, carrying out air cooling on the cast, heating the cast to achieve a temperature of 200-260 DEG C, carrying out thermal insulation for 6-10 h, and carrying out air cooling to achieve a room temperature to obtain the multi-component alloy cast iron cast with excellent performances.

The invention provides super-thick structural steel with high strength and good low-temperature toughness, which belongs to the technical field of steel rolling and comprises the following chemical components: less than or equal to 0.12% of C, 0.20-0.50% of Si, 1.00-2.00% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.020-0.050% of Al, less than or equal to 1.00% of Cu, less than or equal to 1.00% of Cr, less than or equal to 1.00% of Ni, less than or equal to 0.80% of Mo and the balance of Fe and inevitable impurities. The extra-thick structural steel is excellent in mechanical property, high in strength, excellent in low-temperature toughness and suitable for being used as engineering structural steel in alpine regions. The invention further provides a production method of the extra-thick structural steel with high strength and good low-temperature toughness.

The invention provides a door closing device for an aluminum-coated wooden door. The door closing device for the aluminum-coated wooden door comprises a baffle block and a shell body, the baffle blockis arranged in a U-shaped shape, the side of the baffle block extends downwards to a horizontal installation block, and installation plates are horizontally arranged on the two sides of the shell body.A movable seat and a first rotating shaft are arranged at the front end of the shell body, one side of the movable seat is movably connected with the middle part of the front end of the shell body through the first rotating shaft, the middle part of the movable seat is arranged in an upward convex shape, a roller is installed at the end, away from the shell body, of the movable seat through a second rotating shaft, and the roller is correspondingly arranged in the baffle block. A connecting rod and a third rotating shaft are arranged at the end, near the shell, of the movable seat, the connecting rod is installed in the movable seat through the third rotating shaft, a first installation plate is fixed to one end of the connecting rod, a second installation plate is fixed to the inner wall of the right side of the shell body, and a plurality of tension springs are installed between the first installation plate and the second installation plate. The door closing device is simple in structure, small in space occupation, high in structure strength of the movable seat, and long in service life.

The invention discloses a wear-resistant material, in which aluminum nitride, aluminum oxide, molybdenum disilicide, and graphite powder particles are evenly distributed in an aluminum alloy matrix, and a composite micro-arc oxidation layer is distributed on the surface of the aluminum alloy matrix, aluminum nitride, oxide Aluminum and molybdenum disilicide have high hardness, which can significantly improve the hardness and wear resistance of the material, and graphite powder can improve friction reduction. The composite micro-arc oxidation layer on the surface can effectively improve the wear resistance and corrosion resistance of the alloy surface. Sn, Ru, Sr, Lu, Cu, Mn, Mg, Mo, Fe and other elements in the alloy strengthen phase dispersion strengthening to improve the mechanical properties of the material. In the preparation method, the mixed powder is adhered to the pure aluminum wire, so that the mixed powder is located in the center of the master alloy liquid during casting, which is conducive to the rapid diffusion and homogeneity of the micro-powder particles, improves production efficiency, and optimizes the parameters of micro-arc oxidation film formation And conditions, improve the hardness and smoothness of the oxide ceramic film, reduce the film thickness, and effectively improve the wear resistance of the material.

The invention relates to a nickel-based alloy, a stainless steel valve provided with a seal surface of a nickel-based alloy layer and a preparation method. The components and the contents of the nickel-based alloy used on the seal surface of the nickel-based alloy layer are respectively: 1.0 to 1.5wt percent of C, 17.5 to 19.5wt percent of Cr 7.0 to 9.0wt percent of Mo, 3.5 to 4.5wt percent of W, 1.5 to 2.5wt percent of Nb, 2.0 to 3.0wt percent of Si and the rest is Ni. The stainless steel valve provided with a seal surface of a nickel-based alloy layer is lead the powder of the nickel-based alloy to form a seal surface nickel-based alloy on the stainless steel valve through a laser plating method. The nickel-based alloy layer and a stainless steel matrix are completely metallurgically bonded without the defects like cracks, air holes, and the like. The alloy layer comprises nickel-based solid solution dendrites, the metallic carbides between the dendrites, the metal silicides, and the like. The reinforced layer of the nickel-based alloy has higher rigidity (HRC43-49) and excellent properties for anti-heat and shock and can be used for preparation the alloy reinforced layer on the seal surface of the stainless steel which has strict demands on the alloy components (B and Co are excluded).

The invention involves a medium -to -strong heat -resistant magnesium alloy.The quality of the alloy is scored: aluminum: 7.5-9.0%, silver: 0.02-0.80%, zinc: 0.35-0.55%, rare earth: 0.01-0.10%, calcium: 0.001-0.020%, manganese: 0.05-0.20%, the rest ofFor magnesium and irregular impurities.Adding rare earth elements can significantly improve the intensity of magnesium alloy; adding appropriate amounts of silver and calcium can effectively improve the high temperature performance of the alloy.This alloy is ≥350MPa in the T5 state temperature, the yield strength ≥210MPa, and the elongation rate ≥6%;The structural parts of high -temperature service conditions in the field of automobile industry are required to meet the requirements of aviation, aerospace and automotive industry.

The invention discloses an in-situ self-generated nano-Al 2 o 3 A laser additive manufacturing method for strengthening an aluminum-based composite material, the method comprising the following steps: (1) mixing ZnO ceramic powder and AlSi10Mg aluminum alloy powder and ball milling to obtain a ZnO / AlSi10Mg composite powder; (2) preparing the composite powder The laser selective melting process is used for additive manufacturing forming to form a solid sheet; (3) The laser re-scans the solid sheet to form a remelted sheet; (4) Repeat steps (2) and (3) to finally form the original self-generated nano-Al 2 o 3 Reinforced aluminum matrix composites. In the present invention, laser is used to excite Al and ZnO to generate aluminum thermal reaction between them in situ. 2 o 3 Ceramic particles, and by improving the overall flow process design of the method, combining laser selective melting and laser remelting scanning, the aluminum matrix composite material obtained has high density, fine microstructure, and in-situ self-generated Al 2 o 3 The particle size is nanoscale, uniformly distributed, and its phase interface is well combined with the aluminum matrix.

The invention discloses a lightweight ultra-high-strength corrosion-resistant weldable titanium alloy wire rope for cranes. The weight percentage of the alloy is: Cr: 2.0-6.0%, Mn: 1.0-3.0%, Co: 2.0-5.0%, Zr: 2.0~6.0%, Al: 2.0~4.0%, Cu: 0.2~0.5%, Dy: 0.05~0.10%, the total content of C, H, O and N impurity elements is less than 0.3%, and the balance is Ti. The titanium alloy wire rope of the present invention has high specific strength and good plastic toughness, and has excellent corrosion resistance and antifouling performance at the same time, and the weight is reduced by more than 40%; it is suitable for lifting equipment in port coasts, ocean platforms and coastal areas And other fields have good technical application and market prospects.