37results about How to "Increased compressive yield strength" patented technology

The invention relates to a method for preparing a ceramic particle reinforced foamed aluminum-matrix composite material, which relates to a method for preparing a foamed aluminum-matrix composite material. The method solves the problems of high production cost and nonuniform pore distribution of the obtained foamed aluminum-matrix composite material due to a foaming agent TiH2 adopted in a conventional melt-foaming method which is expensive, needs pretreatment and has a difficultly controlled decomposition rate. The method comprises the following steps of: mixing aluminum alloy powder, ceramic particles and calcium carbonate (CaCO3) powder and placing a mixture into a graphite mould; placing the graphite mould into a vacuum hotpressing sintering furnace to prepare a prefabricated body; and performing forward extrusion, heating and foaming on the prefabricated body to obtain the ceramic particle reinforced foamed aluminum-matrix composite material. By using a powder metallurgic method and taking the CaCO3 powder as a foaming agent, the method has the advantages of low price, no pretreatment, simple process, stable decomposition rate, convenience for industrial production and uniform pore distribution of the obtained composite material which has a pore diameter of 0.5 to 2 mm, a porosity of 40 to 82 percent and a compressive yield strength of 36 to 70 MPa.

The present invention relates to a high strength Al—Zn alloy product with an improved combination of corrosion resistance and toughness, the alloy including essentially (in weight percent): Zn: 6.0-9.5, Cu: 1.3-2.4, Mg: 1.5-2.6, Mn and Zr<0.25 but preferably in a range between 0.05 and 0.15 for higher Zn contents, other elements each less than 0.05 and less than 0.25 in total, balance aluminium, wherein (in weight percent): 0.1[Cu]+1.3<[Mg]<0.2[Cu]+2.15. The invention also relates to a method to produce these alloy products, and to some preferred applications thereof such as upper wing applications in aerospace.

The invention discloses a zirconium-niobium alloy tibial plateau prosthesis containing an oxide layer and provided with bone trabecula as well as a preparation method. According to the method, zirconium-niobium alloy powder is used as a raw material, an intermediate product is obtained through 3D printing integral forming, and then the tibial plateau prosthesis comprising a near-plateau support bone trabecula layer and a far-plateau support bone trabecula layer is prepared through hot isostatic pressing, cryogenic treatment and surface oxidation, the pore diameter and porosity of the near-plateau support bone trabecula layer are uniformly arranged, and the pore diameter and porosity of the far-plateau support bone trabecula layer are arranged in different areas; the bone trabecula topological structure of the tibial plateau prosthesis is in three-dimensional gradient distribution, the micro-strain of 64%-72% of a finite element model is between the lowest effective strain threshold value and the hyper-physiological strain threshold value, the mechanical adaptability of the prosthesis is improved, and the prosthesis has excellent bone ingrowth performance; and the oxide layer of thetibial plateau prosthesis can integrally realize excellent biocompatibility of an osseointegration interface and superhigh wear resistance and low wear rate of a friction interface.

The invention relates to closed-cell foam aluminum alloy. The closed-cell foam aluminum alloy is prepared from aluminum, scandium, zirconium and titanium, wherein the mass of the scandium accounts for0.4-0.6% of that of the foam aluminum alloy, the mass of the zirconium accounts for 0.02-0.2% of that of the foam aluminum alloy, the mass of the titanium accounts for 0.5-2% of that of the foam aluminum alloy, and the content of other impurities does not exceed 0.8%. After being subjected to aging treatment, the closed-cell foamed aluminum alloy provided by the invention has the strength increased by nearly 88% compared with the conventional foamed aluminum, and can maintain the compressive yield strength to be stable for a long time at 330 DEG C, so that the problem that the performance aging enhancement of the surface and inside of the foamed aluminium is not uniform due to slow heat conduction of the closed-cell foam aluminum alloy can be effectively solved.

The invention discloses a new-typed structure metal compound of Fe modified NiAl-Cr (Mo) polyphase eutectic crystal, which comprises the following parts: 33at% Ni,30at% Cr,4at% Mo,3-17at% Fe and Al, wherein the NiAl-Cr (Mo) polyphase alloy is modified by Fe, which induces plastic third phase gamma-phase and gamma'-phase to improve high-temperature strength and indoor temperature flexibility and plasticity.

Disclosed is a Al—Zn alloy wrought product, and a method of manufacturing such a product, with an improved combination of high toughness and high strength by maintaining good corrosion resistance, the alloy including (in weight percent): Zn 6.0-11.0, Cu 1.4-2.2, Mg 1.4-2.4, Zr 0.05-0.15, Ti <0.05, Hf and / or V <0.25, and optionally Sc and / or Ce 0.05-0.25, and Mn 0.05-0.12, other elements each less than 0.05 and less than 0.50 in total, balance aluminium, wherein such alloy has an essentially fully unrecrystallized microstructure at least at the position T / 10 of the finished product.

The invention relates to a medical degradable Fe-Mg-Ag alloy material and a preparation method thereof. The Fe-Mg-Ag alloy material comprises the following chemical components by weight percentage: 30% of Mn, 1-10% of Ag, and the balance iron. The invention utilizes the characteristic that Fe30Mn alloy can be corroded in the human environment so as to be biodegradable, the positive potential antibacterial element Ag is added into the alloy for smelting in a vacuum arc furnace, and rapid cooling is carried out to obtain the novel degradable iron-based alloy. The alloy has greatly increased degradation rate, is conducive to shortening the degradation time after implantation into the human body and reducing the stimulation of the implant to organisms, and later through release of Ag+, the implant has certain antibacterial properties, thus improving the therapeutic effect of medical devices. The material provided by the invention has good mechanical properties and biocompatibility, and hasmore excellent nuclear magnetic resonance compatibility.

The invention discloses a submerged arc surfacing manufacturing process for a looper roll used in a rolling mill. The specific steps are as follows: rough machining the parent material until the outer diameter is 6mm less than the finished product size, using hard material welding wire, and matching HJ107 flux, and reverse welding The variable DC welding machine is surfacing until the outer diameter is 3-5mm thicker than the finished product; the base metal is subjected to post-heat treatment, kept at 600°C for 3 hours, then cooled with the furnace, and then air cooled after the furnace temperature drops to 300°C , to obtain surfacing products, and after finishing the surfacing products to the specified specifications according to the process drawings, the looper rolls for rolling mills are obtained. The invention has the advantages of wear resistance, long service life and the like.

The present invention provides an expandable high-strength steel material and an expanded high-strength steel pipe having excellent expansibility and crush resistance, and a manufacturing method of the expandable high-strength steel material and the expanded high-strength steel pipe. The expandable high-strength steel contains, by weight, manganese (Mn): 12% to 18%, carbon (C): 0.3% to 0.6%, and the balance of iron and unavoidable impurities, wherein carbon (C ) and manganese (Mn) satisfy the following conditions: 23≤35.5C+Mn≤38. Before expansion, the expandable high-strength steel has an austenitic single-phase microstructure; after expansion, the expandable high-strength steel has martensite comprising 5 to 50 area % and 50 to 95 area % % austenitic microstructure.

The invention discloses a centimeter-sized high-toughness and high-corrosion resistance Zr-based bulk amorphous alloy, which specifically has a chemical formula ZraAlbNicAgd, wherein a is more than 54 and less than 58 atomic percent, b is more than 12 and less than 18 atomic percent, c is more than 18.2 and less than 24 atomic percent, and d is more than 5.6 and less than 9 atomic percent, and a+b+c+d=100. The invention also discloses a preparation method for the Zr-based bulk amorphous alloy and a method for preparing a thin strip and a rod by utilizing the amorphous alloy. According to the Zr-based bulk amorphous alloy and the methods, elemental Ni and Ag are selected as components of the alloy, so that the corrosion resistance is greatly improved, the amorphous alloy formability of a Zr-Al-Ni alloy is improved, and the prepared bulk amorphous alloy is ultrahigh in formability; the Zr-based amorphous alloy also has the characteristics of high-amorphous alloy formability, high toughness and high corrosion resistance.

The invention discloses application of bending torsion filaments obtained by chopping a steel wire rope, and particularly relates to application of a mechanical structure part made from a metal porous material formed by pressing and sintering bending torsion filaments obtained by chopping a steel wire rope in directly achieving porous rigid vibration attenuation. According to different using conditions, the porosity of the metal porous material which is formed by pressing and sintering bending torsion filaments obtained by chopping the steel wire rope is adjustable, the porosity mainly ranges from 20% to 75%, and the loss factor ranges from 0.01 to 0.06. The sintered bending torsion filament metal porous material is machined into a part to be applied to a mechanical structure for rigid vibration attenuation, the porosity of the filament porous material ranges from 20% to 50%, and the loss factor ranges from 0.01 to 0.04. The metal porous material can be directly machined into the bearing structural part, and mechanical system porous light rigid vibration attenuation is achieved.

The invention provides a structural-performance-controllable high-elasticity-modulus titanium-based composite material and a preparation method of the structural-performance-controllable high-elasticity-modulus titanium-based composite material and relates to the structural-performance-controllable high-elasticity-modulus titanium-based composite material and the preparation method of the structural-performance-controllable high-elasticity-modulus titanium-based composite material. The structural-performance-controllable high-elasticity-modulus titanium-based composite material and the preparation method of the structural-performance-controllable high-elasticity-modulus titanium-based composite material aim to solve the problems that it is difficult for the elastic modulus of a titanium alloy to exceed 120 GPa, it is difficult for the elastic modulus of the titanium-based composite material to exceed 170 GPa, and the formability and processability of ceramic such as TiC are poor are solved. According to the structural-performance-controllable high-elasticity-modulus titanium-based composite material and the preparation method, industrial pure titanium and diamond are taken as raw materials, and TiCp and diamond reinforced phases are introduced into the material in a target manner through a powder metallurgy method. The blank of the titanium material with the elastic modulus being higher than 170 GPa is filled, the shape of the net structure is achieved by changing the ball milling process, and the diamond reacting dose is controlled by changing the sintering process. The preparation method is used for preparing the high-elasticity-modulus titanium-based composite material.

The invention discloses an iron-based amorphous alloy material with high saturation magnetic induction. The chemical composition of the iron-based amorphous alloy material is FeaMobSicPdCeBf, and a+b+c+d+e+f=100%, the atoms of b The percentage range is 0-2, the atomic percentage range of c is 2-5, the atomic percentage range of d is 8-10, the atomic percentage range of e is 5-8, the atomic percentage range of f is 3-5, a is the rest quantity. The FeaMobSicPdCeBf alloy material of the invention has a high saturation magnetic induction of 1.30-1.55T and good amorphous forming ability, and can be widely used in structural materials and soft magnetic materials. The preparation method of the alloy material is simple and the production cost is low.