4results about How to "No flaking" patented technology

The application discloses a composite protection structure suitable for cement alkaline porous characteristics and a preparation method, and belongs to the technical field of cement product marine protection. The application aims to solve the technical problems of weak combination of the existing coating and the cement base material, poor alkali resistance, insufficient synergy of corrosion resistance and biological adhesion resistance. The protection structure is a four-layer gradient structure from inside to outside, which is a silane modified cement base layer, a composite rust prevention layer, a composite bonding layer and a wear-resistant biological surface layer, and precisely adapts to the characteristics of the cement base material. The preparation method integrates cold spraying and induction heating processes, and takes into account the coating density and the feasibility of on-site construction. The bonding strength of the protection structure and the cement base material is greater than or equal to 4.5 MPa, the salt spray corrosion resistance is more than 2200h, the marine biological adhesion area is less than or equal to 1.0%, the mass loss after freeze-thaw cycles (100 times) is less than or equal to 1.0%, and the wear resistance is less than or equal to 0.03g / cm 2 , and the cement alkaline environment serves for 18 months without powdering and cracking, and can be widely applied to cement products such as marine piles, fenders and breakwaters.

This invention belongs to the field of powder metallurgy component surface strengthening technology, aiming to solve the problem that existing clutch tooth surface strengthening processes struggle to simultaneously achieve geometric accuracy, wear resistance, and process efficiency. This invention provides a method for strengthening the wear resistance of clutch tooth surfaces, comprising: mixing iron-nickel-molybdenum alloy powder, nano-tungsten carbide powder, nano-alumina powder, and lubricant; adding a binder and melting and mixing; then adding the mixture into a mold for injection molding; subsequently performing solvent degreasing and thermal degreasing treatments; followed by pre-sintering treatment; then transferring the pre-sintered part into a chemical vapor deposition reaction chamber, where an intermetallic compound transition layer, a titanium carbide main layer, and a nanocrystalline surface layer are sequentially deposited on the tooth surface; then performing vacuum sintering, liquid phase sintering, and pressurized cooling; finally, subjecting the sintered part to hot isostatic pressing (HIP) strengthening treatment; and finally, grinding the tooth surface. This invention can simultaneously address the three aspects of clutch tooth surface strengthening processes: geometric accuracy, wear resistance, and process efficiency.

The application discloses a Cr3C2-BN nickel-based ultra-high-speed laser cladding composite coating and a preparation method thereof. In the cladding raw material powder, the mass percentage of the nickel-based powder is 65-75%, the mass percentage of the Cr3C2 powder is 20-30%, and the mass percentage of the h-BN powder is 2-10%. The main steps for preparing the coating are as follows: the three kinds of powders are uniformly mixed and then are put into a laser cladding device; and the laser cladding machine is started to perform laser cladding on a 40Cr rod material rotating appropriately with Ar gas as a protective gas. In the obtained coating, the hard phase particles are mainly Cr3C2 particles; the addition of BN promotes the melting of the Cr3C2 powder, enhances the uniformity of the coating, improves the forming quality of the coating, and generates dendritic networks around the Cr3C2 particles to optimize the mechanical structure of the coating. The coating prepared by the method has good surface morphology and excellent wear resistance and corrosion resistance; the application has simple process, excellent performance of the obtained product and is convenient for industrial application.

The invention discloses a multistage cycle wear-resistant coating and a preparation method thereof, and belongs to the technical field of material surface engineering. The coating is formed by alternately stacking bearing main layers and toughening transition layers in the thickness direction, and a multi-stage periodic structure is formed. Wherein the bearing main layer adopts CrN-based coatings and TiAlN-based coatings which are alternately distributed along the thickness direction; the toughening transition layer is located between the adjacent bearing main layers, and the interior of the toughening transition layer is of a nanometer superlattice structure formed by alternately stacking two nitride sub-layers. In the preparation process, a high-power pulse magnetron sputtering technology is utilized, a differentiated pulse width energy regulation and control strategy is adopted, the sub-micron bearing main layer is deposited by utilizing long pulse width to reduce internal stress, and the nano superlattice transition layer is deposited by utilizing short pulse width to obtain high hardness and high density. According to the structure and the process, the problem that the hardness and the toughness of a traditional hard coating are inverted is effectively solved, and cooperation of ultrahigh hardness, excellent binding force and low wear rate of the coating is achieved.