6results about How to "Reduce softening" patented technology

The application provides a copper-aluminum dissimilar metal resistance brazing method for a wind power generator, comprising the following steps: S1, temperature field regulation of partition resistance heating: a partition resistance heating mode of double-electrode independent power supply is adopted, current is respectively input to the copper side and the aluminum side for independent control, and the brazing interface temperature is controlled in the range of 580-620 DEG C; S2, interface diffusion control of nano nickel barrier layer: a nano-crystalline nickel barrier layer is prepared in advance on the surface of the copper matrix to be connected; S3, wetting and filling of zinc-based composite filler material: zinc-based composite filler material is used for brazing; S4, pressure-assisted brazing seam densification: axial pressure in the range of 0.5-2 MPa is applied during brazing; S5, atmosphere protection and surface activation: the brazing process is carried out under the condition of inert protective atmosphere. Through the cooperation of partition heating and nano nickel barrier layer, the strength of the copper-aluminum brazed joint is improved to more than 80% of the base material, and the contact resistance is reduced to 3 mu omega cm 2 The energy consumption of the single piece is reduced by 80%, and the qualified rate reaches more than 95%.

The invention belongs to the technical field of composite materials, and provides a heat and humidity resistant PEEK composite material and a preparation method thereof, the heat and humidity resistant PEEK composite material comprises the following raw materials by weight: 85-110 parts of PEEK; 5 to 15 parts of polytetrafluoroethylene; 5 to 15 parts of carbon fiber; 5 to 10 parts of modified montmorillonite; 0.5 to 2 parts of a compatilizer; and 0.1 to 0.5 part of an antioxidant. The preparation method comprises the following steps: putting PEEK and polytetrafluoroethylene into a drying oven for drying, then adding the dried PEEK and polytetrafluoroethylene, carbon fibers, modified montmorillonite and an antioxidant into a high-speed mixer for mixing, and uniformly mixing to obtain a mixture; the preparation method comprises the following steps: mixing the raw materials, adding the mixture into a double-screw extruder, extruding and granulating, cooling, and drying to finally prepare the PEEK composite material, while maintaining excellent friction resistance and mechanical properties, the heat and humidity resistance is obviously improved, and the PEEK composite material has a wide application value.

This invention proposes a brazing method for aluminum alloys based on surface activation and a pre-placed Ni layer. The method includes: Step 1, pre-treating the aluminum alloy surface to be brazed to ensure it is dust-free and oil-free; Step 2, subjecting the aluminum alloy surface to ion bombardment to remove the oxide film and activate the surface; Step 3, depositing a Ni thin film on the aluminum alloy surface to form a pre-placed Ni layer; Step 4, assembling the aluminum alloys to be brazed and placing them in a vacuum brazing furnace, with the Ni layers of the two aluminum alloys in contact. Pressure is applied to ensure the upper and lower aluminum alloys are tightly bonded and to prevent relative sliding. The furnace is then vacuum-heated to 540℃~585℃ and held for a preset time before cooling to room temperature to obtain an aluminum alloy / Ni / aluminum alloy brazed joint. The joint obtained by this surface-activated, pre-placed Ni layer-based aluminum alloy brazing method has the characteristics of no oxide film at the interface, high tensile strength, and low deformation rate.

This invention relates to the field of mine ecological restoration technology, and discloses a method and system for mine ecological restoration. The restoration method includes selecting an area with residual heat from underground coal fires on a mine slope where residual coal has spontaneously combusted as a restoration zone; reinforcing and stabilizing the slope of the restoration zone; laying a sludge substrate with a moisture content of 60%-80% on the stabilized slope surface, and using the residual heat from the underground coal fires for in-situ biological drying until the volume reduction reaches a preset threshold of 40%-60%; subsequently, covering the dried sludge substrate with a soil substrate layer and a soil microbial substrate layer to construct a composite growth matrix; and finally, maintaining vegetation on the slope. This invention cleverly combines the residual heat from abandoned mines with urban sludge treatment, achieving the harmlessness, reduction, and resource utilization of sludge, while simultaneously solving the problems of excessively high soil temperatures and difficulty in plant survival in mining areas, achieving the goal of ecological restoration through waste treatment and synergistic efficiency.

The utility model belongs to the field of rolling technology, specifically is a kind of export sliding guide adjustment structure, including guide box;The guide box top is rigidly connected with stepper motor;Stepper motor output end is rigidly connected with rotating rod;Rotating rod both ends are rotatably connected with connecting rod;Connecting rod end is rotatably connected with support;The support one side is rigidly connected with wheel carrier;Wheel carrier both ends are slidably connected with slide rail;Wheel carrier bottom is rotatably connected with a group of guide wheels;The guide wheel bottom is rotatably connected with sliding block;A group of sliding grooves are arranged in the guide box top;The spacing between multiple groups of guide wheels can be adjusted by the rotation of rotating rod and related components driven by stepper motor, to adapt to the rolling conveying needs of different diameters, and multiple groups of guide wheels form continuous guide channel, apply uniform constraint to rolling, reduce deviation or shaking of rolling in conveying process, and its along straight line enters next rolling process, improves rolling precision and product quality.

The application discloses a kind of high-strength waterproof board and preparation method thereof, it is related to plate technical field.The preparation method of the application includes the following steps: sequentially stack 1 steel plate, 2 base plates, 1 fingerprint-resistant polymer film on 1 fingerprint-resistant polymer film, then heat pressing solidification, after cooling, plate is taken out, and high-strength waterproof board is obtained;Wherein, base plate is prepared from modified kraft paper and modified color paper.The water resistance, fire resistance and bonding strength of the plate are effectively improved by modifying kraft paper with modified phenolic resin, hydrophilic silicon dioxide and other components;The bonding strength, water resistance and fire resistance of the plate are further improved by modifying color paper with melamine, vanillin, flame retardant DOPO, 3,4-dihydroxybenzaldehyde and other components.Therefore, the application has a more extensive application prospect.