9results about How to "Reduce surface cracks" patented technology

The invention relates to the field of concrete additives, in particular to a heat-resistant anti-freezing water-based permeable inorganic waterproof agent as well as a preparation method and application thereof. The invention discloses a heat-resistant and anti-freezing water-based permeable inorganic waterproof agent which is prepared from the following raw materials in parts by mass: 55-70 parts of active potassium silicate, 10-12 parts of Portland cement, 10-20 parts of modified silicon dioxide, 5-10 parts of a filling agent, 2-4 parts of a coupling agent, 0.5-1.5 parts of a catalyst, 3-8 parts of a dispersing agent, 1.5-3 parts of a stabilizer and 30-50 parts of deionized water. The inorganic waterproof agent prepared by the invention not only has excellent waterproof performance, but also can effectively improve the corrosion resistance, aging resistance, stability and the like of concrete at the same time, can meet the construction requirements of existing deep operation, has very excellent comprehensive performance, and has very excellent application prospects.

The invention discloses a preparation method of a peritectic steel large forged circle, and relates to the technical field of forged circle manufacturing, and the preparation method comprises the following steps: S1, molten steel pouring; s2, the red mold enters a slow cooling pit for heat preservation; s3, digging out of the pit; step S4, surface cleaning; s5, steel ingot preheating; s6, forging and forming; and S7, heat treatment. The peritectic steel large forged circle manufactured through the manufacturing method of the peritectic steel large forged circle is few in surface crack, high in black skin yield and large in yield strength.

The invention discloses a processing method of a large thermal strength titanium alloy forge piece, which comprises the following steps of: mixing a single electrode, pressing into an electrode block, welding the pressed electrode block into a strip-shaped electrode, putting the electrode into a vacuum consumable electric arc furnace, and carrying out vacuum melting for 2-3 times to obtain a thermal strength titanium alloy cast ingot; the method comprises the following steps: brushing an antioxidant protective coating on the surface of a hot-strength titanium alloy ingot, heating and preserving heat after the coating is dried, discharging an ingot blank, transferring the ingot blank to a forging machine for cogging forging, performing multi-heating-number forging on a titanium alloy forging blank above and below a phase transformation point, discharging the titanium alloy forging blank, and putting the titanium alloy forging blank into a mold for finish forging forming, carrying out solid solution aging treatment on the semi-finished thermal strength titanium alloy forge piece; the die is reasonable in structural design, the service life of the die is guaranteed, it is guaranteed that the quality and performance of the thermal strength titanium alloy forge piece meet the requirements, and various application requirements are met.

This utility model discloses a tube bending machine for vehicle frame production, including a base platform and a support frame fixed on top of it. A first cylinder is mounted on the top of the support frame and is connected to a forming mold located below the support frame. The base platform has forming wheels that cooperate with the forming mold. It also includes a heating mechanism, a tube fixing mechanism, and a cooling mechanism. The heating mechanism includes a movable seat, a second cylinder, a guide rail, and an electromagnetic heating component. The movable seat is slidably mounted on the side of the base platform via the guide rail. The second cylinder drives the movable seat to move in a direction closer to and away from the tube fixing mechanism. The electromagnetic heating component is fixed on the movable seat. The movable electromagnetic heating mechanism locally heats and softens the part of the tube to be bent, reducing bending resistance. Combined with the cooling mechanism, it quickly shapes the tube, reducing material springback and surface cracks, significantly improving the bending accuracy and yield of high-hardness tubes. At the same time, the integrated process shortens the tube processing cycle.

The invention relates to rubber particle self-compacting concrete which comprises 400.00-580.00 kg / m of a cementing material, 1781.00-1831.00 kg / m of aggregate, modified rubber powder accounting for 18.50-20.00% of the total weight of the aggregate, water accounting for 22.41-39.00% of the total weight of the cementing material, and a polycarboxylic acid additive accounting for 1.08-2.93% of the total weight of the cementing material, wherein the modification process of the modified rubber powder comprises the following steps: in a closed environment, preheating waste rubber powder, adding the preheated waste rubber powder into epigallocatechin gallate dispersion liquid, soaking and activating for 20-40 minutes, then adding benzoyl peroxide, toluene sulfonamide / epoxy resin and ammonium molybdate, stirring and modifying for 10-12 hours at 160-180 DEG C, and after the modification is finished, performing post-treatment to obtain the modified rubber powder. The modified rubber powder is obtained. The mixing amount of the rubber particles in the concrete is adjusted, and the rubber particles are properly modified, so that the concrete has the advantage of jointly improving the compression resistance, splitting tensile property and bending tensile property of the concrete.

The application provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode sheet and a battery. The silicon-carbon negative electrode material comprises a core and a carbon coating layer coated on the core; the core comprises a porous carbon framework and silicon particles, and the silicon particles are arranged in the pores of the porous carbon framework; there is a gap between the silicon particles and the surface of the pores of the porous carbon framework; in the core, the volume of the gap is V1, the volume of the silicon particles is V2, and V1 / V2 is 0.04-0.9. The silicon-carbon negative electrode material provided by the application has a buffer cavity reserved between the silicon particles and the pores of the porous carbon framework for silicon expansion, and can realize a silicon-carbon negative electrode material with low expansion and excellent electrical performance.

The invention discloses high-nitrogen austenitic stainless steel and a preparation method thereof, and the preparation method comprises the following steps: (1) smelting and die casting raw materials to obtain a stainless steel cast ingot; (2) performing heat treatment on the stainless steel cast ingot, wherein the heat treatment is performed according to a preset temperature curve; (3) pre-deforming the stainless steel cast ingot subjected to heat treatment to obtain a pre-deformed blank; (4) carrying out hot working on the pre-deformed blank to obtain a stainless steel plate; and (5) the stainless steel plate is subjected to aftertreatment, and the high-nitrogen austenitic stainless steel is obtained. By implementing the method, hot working cracks can be avoided, and the prepared high-nitrogen austenitic stainless steel has good size uniformity and mechanical property.

According to the modified high-nickel sodium-ion battery ternary positive electrode material disclosed by the invention, the surface of the positive electrode material is provided with an inner coating layer and an outer coating layer, and the multi-layer coating structure not only effectively isolates direct contact between the positive electrode material and an electrolyte, but also inhibits side reaction in the electrolyte and dissolution of the material; the effect of protecting the electrode material can also be achieved, and the structural stress and surface cracks caused by volume change of the electrode material in the charging and discharging process are reduced, so that the structural integrity and stability of the material are maintained. The dual protection measure not only prolongs the cycle life of the electrode material, so that the electrode material keeps a relatively high capacity retention ratio in multiple charging and discharging cycles, but also improves the rate capability of the electrode, so that the battery can still keep good electrochemical performance during charging and discharging at high rate.

This invention provides a static extrusion forging mold structure for process nozzles, including an upper mold, a lower mold, an inner punch shaft-connected to the upper mold, and a pad shaft-connected to the lower mold. The forged product is located between the upper and lower molds. The shape and dimensions of the inner wall of the lower mold match the shape and dimensions of the outer wall of the forged product, and the shape and dimensions of the outer wall of the inner punch match the shape and dimensions of the inner wall of the forged product. The advantages of this invention are: using static extrusion forging technology to statically extrude the workpiece results in high-precision forging dimensions; the probability of surface cracks appearing during slow extrusion is greatly reduced; and raw materials are significantly saved compared to traditional processing methods.