37results about How to "Significant aging effect" patented technology

The invention belongs to the field of structural metallic materials, and particularly relates to an extrusion casting magnesium alloy material and a preparation method thereof. The material is prepared from the following elements in percentage by mass: a% of Al, b% of one or more of La, Ce and Pr, c% of Mn, d% in total of one or more of RE rare earth elements Gd, Y, Sm, Nd, Er, Eu, Ho, Tm, Lu, Dyand Yb, less than 0.2% of impurities and the balance Mg, wherein a, b, c and d satisfy the following conditions: a is greater than or equal to 3.5 and less than or equal to 4.5, b is greater than or equal to 3.5 and less than or equal to 4.5, c is greater than or equal to 0.2 and less than or equal to 0.5, and d is greater than or equal to 0.01 and less than or equal to 3.0. The material has the advantages of being excellent in mechanical property, good in casting performance and capable of expanding the application field of the magnesium alloy material. The invention further provides a preparation technology. The preparation technology has the advantages of being good in stability and high in controllability.

The invention provides a degradable antibacterial magnesium alloy and a preparation method of the degradable antibacterial magnesium alloy, and relates to the field of metal biomedical materials. Thedegradable antibacterial magnesium alloy comprises main active elements of Ag, Cu, Zn and Sr, and by means of composition optimization design of the magnesium alloy, the components comprise, by mass,1.35-1.65% of Ag, 0.9-1.1% of Cu, 3.6-4.4% of Zn, 0.9-1.1% of Sr, 0.36-0.44% of Ca and the balance Mg and other inevitable impurities. After the magnesium alloy material implant finishes the action, the magnesium alloy material implant can be completely degraded to avoid secondary operation removal, the medical cost and the pain of patients are reduced, the antibacterial property of the implant isimproved, and the magnesium alloy material implant has the functions of promoting osteoblast formation and inhibiting osteoclast bone absorption; the degradable antibacterial magnesium alloy adopts asemi-solid rheological die casting process, the microstructure of the product is uniformly distributed, the internal structure is compact, the defects of pores, segregation and the like are few, andthe requirements for high quality and high precision of implant products can be met.

The invention relates to the technical field of cosmetics, and discloses skin moisturizing and restoring essence taking sheep placenta essence as a main component and a skin moisturizing and restoring cosmetic product. The skin moisturizing and restoring essence contains an active component and a base component, wherein the active component contains sheep placenta essence extract and at least one of largehead atractylodes rhizome extract and aloe extract. The skin moisturizing and restoring essence and the skin moisturizing and restoring cosmetic product are free of irritation to skin, and can effectively keep the moisture of the skin, promote the repairing and regeneration, delay skin ageing and restore the elasticity of the skin.

The invention discloses a method for improving a magnesium alloy welded joint through surface microalloying, and belongs to the technical field of welding technologies in material processing. Mixed powder composed of metal powder including Al, Ti, Cr, Mn and Ni and rare earth element powder including Sc and Nd is developed, and a laser microalloying technology is used for conducting surface modification on a magnesium alloy welding seam area to improve the comprehensive performance of the magnesium alloy welded joint, wherein the power comprises the components in percentage by mass: 9.1%-9.4%of Al, 5.4-5.8% of Ti, 4.1-4.3% of Cr, 0.05-0.2% of Mn, 0.03-0.2% of Sc, 0.8%-2.2% of Nd and the balance Ni, and the grain size of laser microalloyed powder is 100-300 meshes. The laser microalloyingtechnology is adopted to obtain a nanophase-containing cladding layer good in performance on the surface of the magnesium alloy welded joint, and rare earth elements, the other alloy elements and a Mgalloy substrate molten layer can generate a large number of alloy compound wild phases and can effectively refine a microstructure of the cladding layer, improve the mechanical performance of the magnesium alloy welded joint and greatly improve the corrosion resistance performance of the magnesium alloy welded joint.

The invention relates to the field of magnesium alloys, in particular to a high-performance Mg-Y-Mn-Gd deformed magnesium alloy and a preparation method thereof. The magnesium alloy is prepared from the following elements in percentage by mass: 8.0-12.0% of Y, 0.3-0.5% of Mn, 0.2-0.4% of Gd and the balance of magnesium and inevitable impurities. The high-performance Mg-Y-Mn-Gd deformed magnesium alloy adopts industrial pure magnesium ingot, Mg-Y intermediate alloy, Mg-Mn intermediate alloy and Mg-Gd intermediate alloy as raw materials, and the raw materials are subjected to alloy smelting and casting, alloy extrusion processing and double-stage ageing thermal treatment of extruded materials to obtain the magnesium alloy. The magnesium alloy has good extrusion properties and forming properties, can obtain excellent plasticity under an extrusion-state condition, and can obtain high strength after ageing treatment; the preparation method is simple in preparation process, and is low in preparation cost; the prepared deformed magnesium alloy has high strength and high plasticity, so that the problems that the magnesium alloy not containing rare earth is relatively low in mechanical property or the magnesium alloy containing a great deal of rare earth is relatively high in cost and is relatively great in density in the prior art are solved.

The invention provides a heated and reinforced high-strength cast magnesium alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 8.0-10.0 of Zn, 1.0-5.0 of Al, 1.0-5.0 of Sn, 0.1-1.0 of Cu, 0.3-0.8 of Mn, 0.3-0.5 of Ca, and the balance of Mg and inevitable impurity elements. According to the high-strength cast magnesium alloy, under a room-temperature stretch test, the tensile strength reaches 320-350 MPa, and the yield strength reaches 220-260 MPa. A heat treatment process of the magnesium alloy comprises solution treatment by 4-8 hours at a temperature of 330-380 DEG C, air cooling, aging by 8-16 hours at a temperature of 150-220 DEG C and obtaining of the high-strength cast magnesium alloy. The heat treatment process of the alloy is simple and easy to realize; and the aging treatment can form a lot of nanoscale strengthening phases in an alloy structure, so that the alloy strength can be prominently improved. The alloy contains no such noble metal as rare earth, and is an alloy system with low cost and wide applicability.

The invention discloses an electric brush with an age-hardening effect. The alloy comprises the following components in percentage by weight: 30-40% of Ag, 12-20% of Cu, 0.5-2.5% of Pt, 0.1-1.5% of Au, 0.5-2.0% of Zn and the balance of Pd; the alloy contains ordered phases Cu3Pt and Cu3Au through solid-solution treatment and aging treatment. The material contains the ordered phases Cu3Pt and Cu3Au, and thus is improved in hardness and wearability at a high temperature; the material is applicable to the working layer of the electric brush of a small-sized direct-current motor at an environment temperature ranging from 80 DEG C to 150 DEG C; the alloy is combined on the surface of the copper alloy, so that the cost can be saved and the mechanical properties can be improved, and therefore, the properties of the two layers of materials can be developed sufficiently.

The invention provides a wrought magnesium alloy and a preparation method thereof and relates to the technical field of alloy materials. The wrought magnesium alloy is prepared from raw materials, by weight percent, 4.0%-8.0% of zinc, 1.0%-6.0% of bismuth, 0.2%-1.0% of magnesium and the balance magnesium and unavoidable impurities. The wrought magnesium alloy has the characteristics of high strength and high plasticity and excellent mechanical performance, does not contain precious metal, is low in cost and has relatively-good economic benefits. The preparation method of the wrought magnesium alloy comprises the steps that in protection of mixed gas containing SF6, preheated magnesium is heated to be molten, preheated zinc, bismuth and magnesium are added, the temperature is raised, and after the raw materials are molten, the raw materials are cast into an ingot; and the ingot is subjected to extrusion processing and heat treatment. The method is simple in preparation process, high in controllability, low in preparation cost and suitable for large-scale production.