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51results about How to "Curb recession" patented technology

Grain refinement and modification master alloy for aluminum and aluminum alloy and method for preparing same

The invention discloses a grain refinement and modification master alloy for aluminum and an aluminum alloy, which comprises the following components by weight percentage: 3.0 to 10.0 percent of titanium, 1.0 to 3.0 percent of boron, 0.5 to 5.0 percent of strontium, 0.5 to 2.0 percent of cerium-enriched rare earth, and the balance of aluminum. The preparation method for the master alloy comprises the following steps: weighting potassium fluotitanate, potassium fluoborate, a mixed rare earth ingot, an alloy, and a pure aluminum ingot in proportion; drying the potassium fluotitanate and the potassium fluoborate; heating and melting the aluminum ingot and the aluminum rare earth ingot, adding the mixture of the potassium fluotitanate and the potassium fluoborate, and stirring until the melted mass is completely reacted; adding a Al-Sr master alloy, stirring, and performing heat preservation and slagging off; adding hexachloroethane and evenly stirring; and standing, performing heat preservation for 20 to 30 minutes, casting into an ingot and then extruding into a wire. The master alloy can be well combined with an interface of an aluminum matrix; the particle phase is evenly distributed; the grain size of the refinement phase is small; the activated Sr is enough to ensure the following modification; the conglobation of the refinement phase is effectively reduced, and the degradation is inhibited; and the preparation process is low in cost.
Owner:广州工业投资控股集团有限公司 +1

Preparation method of iron-based continuous casting profile based on graphite nodule ultra-fining

ActiveCN113500171AIncrease nucleation rateIncreased nucleation rate and growth rateProcess efficiency improvementMetalIron based
The invention discloses a preparation method of an iron-based continuous casting profile based on graphite nodule ultra-fining. A proper nucleating agent and a proper nodulizer are added into molten iron in the continuous casting process of an iron-based profile, so that the nucleation rate of graphite in the solidification process of the molten iron is far greater than the nucleation rate of the graphite when a conventional nucleating agent and nodulizer are used for inoculation and spheroidizing treatment; and graphite nodules in the continuous casting iron profile are ultra-refined, so that the density number of the graphite nodules at the position, 50 mm from the outside to the inside, of the continuous casting iron profile is not less than 500/mm2 and is far larger than the density number of the graphite nodules obtained after the nodular cast iron profile is treated through the conventional nucleating agent and nodulizer at present. Due to the fact that the density number of the graphite nodules is greatly increased, the diameter of the graphite nodules in the continuous casting iron profile is greatly reduced, the roundness and the distribution uniformity of the graphite nodules are greatly improved, and therefore damage to a metal matrix caused by irregular shapes and uneven distribution of the graphite nodules is remarkably reduced, and therefore, the related performance of the iron profile is obviously improved.
Owner:西安共晶金属科技有限公司

Method for recovering and preserving wild small population of neolitsea sericea

ActiveCN108575496APromote tree growth and rejuvenationCurb recessionCultivating equipmentsSoil-working methodsSample plotNeolitsea sericea
The invention discloses a method for recovering and preserving a wild small population of neolitsea sericea serving as a rare plant. The method comprises the steps: selecting a neolitsea sericea community remained on a coastal mountainous region in the east of Zhejiang to survey each wood on a typical sample plot; calculating importance values and age structures of species by using a statistical sampling method and a population statistical method; creating an optimal adaptable rehabilitation environment according to the dynamic adaption characteristic of the neolitsea sericea on different landsite types and at community development stages for the environment; optimizing the age structure, space distribution, species composition and land site condition of a popularization by using technical means such as mature tree rejuvenation, young seedling transplanting and updating, interfering wood thinning for tending and forest stand management so as to remarkably promote the survival and growth of small population of the neolitsea sericea, restore the structure of the small population to the maximum extent on the premise of finitely protecting plants and meet a production demand. By usingthe method, the growth vitality and stability of the small population of the rare plant are improved; and the method has a wide application prospect in preservation and ecological rehabilitation of the small population of the rare plant.
Owner:EAST CHINA NORMAL UNIV

Recovery and Preservation Methods of Small Wild Population of Zingiber officinalis in Zhoushan

ActiveCN108575496BPromote tree growth and rejuvenationCurb recessionCultivating equipmentsSoil-working methodsSample plotNeolitsea sericea
The invention discloses a method for recovering and preserving a wild small population of neolitsea sericea serving as a rare plant. The method comprises the steps: selecting a neolitsea sericea community remained on a coastal mountainous region in the east of Zhejiang to survey each wood on a typical sample plot; calculating importance values and age structures of species by using a statistical sampling method and a population statistical method; creating an optimal adaptable rehabilitation environment according to the dynamic adaption characteristic of the neolitsea sericea on different landsite types and at community development stages for the environment; optimizing the age structure, space distribution, species composition and land site condition of a popularization by using technical means such as mature tree rejuvenation, young seedling transplanting and updating, interfering wood thinning for tending and forest stand management so as to remarkably promote the survival and growth of small population of the neolitsea sericea, restore the structure of the small population to the maximum extent on the premise of finitely protecting plants and meet a production demand. By usingthe method, the growth vitality and stability of the small population of the rare plant are improved; and the method has a wide application prospect in preservation and ecological rehabilitation of the small population of the rare plant.
Owner:EAST CHINA NORMAL UNIV
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