5results about How to "Reduce oxidation loss" patented technology

The invention relates to the technical field of preparation of silicon carbide ceramics, in particular to an in-situ reaction sintered silicon carbide ceramic and a preparation method thereof.The preparation method comprises the following technological stages which are conducted in sequence: S1, preparation of silicon carbide slurry, specifically, organic matter precursor raw materials are weighed according to the mass content percentage to form the silicon carbide slurry; s2, vacuum grouting: injecting the silicon carbide slurry in the vacuum grouting tank into the shaping mold from the bottom of the shaping mold to form a silicon carbide green body; and S3, in-situ reaction sintering is conducted, specifically, the silicon carbide green body is placed in a sintering furnace, heating, heat preservation and cooling are conducted on the silicon carbide green body in the argon atmosphere through a segmented temperature control technology, and the silicon carbide ceramic is obtained. The silicon carbide ceramic prepared by the method disclosed by the invention has relatively high density and excellent mechanical properties.

This utility model discloses a rare earth wire feeding device, including a housing, a wire feeding assembly, a protective roller, a support roller, and a graphite shaft. The support roller is horizontally and longitudinally positioned on the left side of the middle of the housing, and a graphite shaft is horizontally positioned on the left end face of the support roller. The left end of the graphite shaft extends vertically out of the housing and then extends downwards at an angle to the left. A protective roller is vertically positioned on the upper end face of the support roller, and its upper end is connected to the top surface of the housing. A through hole I is vertically penetrating the upper surface of the housing relative to the position of the protective roller, and a wire feeding assembly is positioned on the upper surface of the housing relative to the through hole I. A channel I is coaxially penetrating the upper end face of the protective roller relative to the position of the through hole I. The lower end of channel I enters from the joint between the protective roller and the support roller, then exits in an arc shape from the joint between the support roller and the graphite shaft, and extends along the length of the graphite shaft out of its left end face, thereby performing the wire feeding operation. This utility model reduces the oxidation loss rate.

The application relates to the field of cupronickel materials, and particularly discloses a new type of cupronickel suitable for a MIM process and a forming process thereof. Metal powder raw materials include the following mass percentages: Ni 12-18%, Sn 0.6-1.0%, mixed lanthanum-cerium-praseodymium rare earth 0.6-1.0%, Cu 80.4-86.4%, and the balance of Fe and inevitable impurities. When the material is used as a whole, the oxidation resistance of the new material in a catalytic degreasing process can be significantly improved, and the material loss in a sintering process is also greatly reduced, so that the inherent shortcomings of traditional cupronickel are overcome, and various cupronickel products with complex shapes can be perfectly produced through the MIM technology.

The invention relates to the technical field of steel rail shears, and discloses a multi-component alloy material for a movable steel rail shear tool and a preparation method, the multi-component alloy material comprises the following raw materials: 0.85-1.05% of C, 4.5-6.0% of Cr, 1.8-2.5% of Mo, 1.2-1.8% of W or V, 0.8-2.3% of Co or 0.4-0.8% of Co, 1.0-1.5% of Ni, 0.3-0.6% of Si, 0.4-0.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurities; according to the steel rail shear tool, through the synergistic effect of elements such as C, Cr, Mo, W, Co, V, Ni, Si and Mn, stable carbide is formed, a microstructure is optimized, the HRC of the steel rail shear reaches 58-62, the impact toughness is larger than or equal to 18 J, the impact toughness of the steel rail shear at the temperature of-40 DEG C is still larger than 15 J, and it is guaranteed that the steel rail shear can still be used in the high and cold environment (-40 DEG C); the steel rail shear is subjected to 1000 times of continuous shearing fatigue tests, the tipping rate is reduced to 0.5% or below, and the use reliability is high.

This invention relates to the field of plant extract preparation technology, and particularly to a low-oxalic acid, high-activity fresh purslane extract, its preparation method, and its applications. This invention uses freshly harvested purslane as raw material. Except for washing, the entire process of pulverization, enzymatic hydrolysis, filtration, and concentration does not require additional process water, directly producing a raw homogenate. After acidification, enzymatic hydrolysis with compound enzymes, enzyme inactivation, filtration, pressing, and oxalic acid removal, the extract is obtained through low-temperature vacuum oxygen-free concentration. This invention requires no organic solvents and can efficiently retain the total flavonoids, total polysaccharides, and phenolic acid active ingredients. The resulting extract contains ≥1.0% total flavonoids, ≥5.0% total polysaccharides, ≥30% solids, and ≤0.05% oxalic acid. This invention solves the problems of activity loss, dilution with added water, oxalic acid irritation, large oxidation losses, and unstable industrialization associated with traditional processes. The process is gentle and can be automated for mass production, making it suitable for cosmetics, personal care products, food, and functional foods.