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179results about How to "low density" patented technology

Reinforced magnesium-lithium alloy of long-period structure and preparation method of reinforced magnesium-lithium alloy

InactiveCN106957979Alow densityAdded Melt Refining Process
The invention provides a reinforced magnesium-lithium alloy of a long-period structure and a preparation method of the reinforced magnesium-lithium alloy. The magnesium-lithium alloy is composed of, by weight percentage, 11-16% of Li, 1-5% of Y, 0.2-2% of Zn, 0-0.6% of Zr and the balance Mg and inevitable impurities, wherein the total amount of Si, Fe, Cu and Ni is less than 0.02%. The preparation method of the magnesium-lithium alloy comprises the steps of smelting under the atmospheric environment and thermal treatment in a common furnace, wherein the smelting process comprises the steps of drying materials, smelting magnesium, adding Y, adding Zn, adding Zr, adding Li, performing refining and performing casting. Double-stage solution treatment is mainly adopted in the thermal treatment process, that is, 300-400 DEG C solution treatment is conducted for 2-10 h, then 200-300 DEG C solution treatment is conducted for 2-6 h, and the cast alloy with the LPSO structural phase is obtained through phase transformation. According to the reinforced magnesium-lithium alloy and the preparation method, the Y element and the Zn element are added to the magnesium-lithium alloy, the LPSO structure phase is introduced into a magnesium-lithium alloy substrate, and the cast magnesium-lithium alloy material with the low density, high strength and good thermal resistance is prepared.
Owner:苏州轻金三维科技有限公司

High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof

InactiveCN101994043Alow densityhigh temperature
The invention provides a high Nb containing TiAl porous intermetallic compound gradient material and a preparation method thereof, belongs to the technical field of itermetallic compounds, and relates to a method for preparing the intermetallic compound porous material. The method comprises four parts, namely (1) preparing a high Nb containing TiAl (Ti-48Al-(5-10)N bat. percent) porous intermetallic compound by adopting a powder metallurgical vacuum sintering process, wherein the porosity is between 30 and 60 percent; (2) mixing Ti powder, Al powder and Nb powder for 8 hours according to the atomic percentage (Ti-48Al-(5-10)N bat. percent), and drying the mixed powder to prepare a cold-spraying powder; (3) cleaning the high Nb containing TiAl coarse porous substrate material prepared in the step (1), and depositing the cold-spraying powder which is prepared in the step (2) onto the coarse porous substrate at one time; and (4) performing vacuum insulation sintering by adopting a three-stage sintering process to obtain a fine pore-coarse pore composite gradient porous material. The method has the advantages that the mixed powder of the Ti powder, the Al powder and the Nb powder is directly sprayed on the outer surface of the high Nb-TiAl porous material, and the process is simple and efficient.
Owner:UNIV OF SCI & TECH BEIJING

Dynamic and static combined loading rock fracture characterization test device and method matched with industrial CT machine

PendingCN111238973Ahigh strengthlow density
The invention provides a dynamic and static combined loading rock fracture characterization test device and method matched with an industrial CT machine, and belongs to the technical field of geotechnical mechanics. The test device comprises an axial pressure system, a confining pressure system, a rotating system and a scanning system; the axial pressure system realizes axial dynamic and static combined stress disturbance loading on a sample, the confining pressure system applies confining pressure to the sample, the rotating system drives the testing machine to rotate through a turntable, andthe scanning system obtains an absorption coefficient of a scanned object through a series of scanning at different angles and performs three-dimensional imaging. According to the invention, the industrial CT scanning technology is utilized, the mesoscopic damage and dynamic fracture evolution process of the rock under dynamic and static combined stress disturbance is observed in real time, and the fracture evolution process of the rock is visually and digitally characterized. The pressure chamber is made of carbon fibers made of special materials and has the advantages of being high in strength and small in density, the ray energy attenuation condition when X-rays penetrate through the pressure chamber is improved under the condition that the function requirement is met, and the triaxialcylinder wall of the pressure chamber bears loading counter-acting force.
Owner:UNIV OF SCI & TECH BEIJING
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