11results about How to "Excellent surface hardness" patented technology

This invention discloses a SiC with an ultra-high temperature ceramic gradient coating. f / SiC composite materials, their preparation methods, and applications. A double-layer glow discharge plasma surface metallurgical method is used to prepare SiC composite materials. f A (Hf,Si,Ta)C gradient composite coating was prepared on the surface of the SiC composite material. This coating was able to resist SiC in an oxygen atmosphere at 1773 K. f Effective protection of SiC composite materials. The specific advantages of this invention are: (1) Ion bombardment of the substrate significantly improves the point defects and conductivity of the composite substrate; (2) The (Hf,Si,Ta)C coating has a continuous gradient structure, forming a good metallurgical bond between the coating and the substrate, with high bonding strength; (3) The similar thermal expansion coefficients of the (Hf,Si,Ta)C coating and the substrate can improve the thermal mismatch between the coating and the substrate, reducing the tendency for coating peeling and cracking during service; (4) The (Hf,Si,Ta)C coating system has a high service temperature and self-healing ability. The coating prepared by this invention has excellent high-temperature protection performance, improving the protection of SiC. f The high-temperature service life of SiC composite materials has broad application prospects in the aerospace field.

The application discloses an artificial blood vessel joint and a preparation method thereof. The blood vessel joint adopts a carbon-based material as a base body, a double-layer composite coating with PyC and Ag-doped DLC and an Ag-doped DLC coating are prepared on the inner wall and the outer wall respectively, and the blood vessel joint is obtained; the inner wall of the blood vessel joint is smooth and compact, which is beneficial to blood circulation; the outer wall is a porous Ag-doped DLC coating, which is beneficial to biological fixation with tissues; the Ag-doped DLC coating endows the blood vessel joint with good antibacterial property, reduces inflammation, and can improve the adverse reaction of the human body caused by friction and powder loss after the blood vessel joint is implanted into the human body.

Examples of the present invention provide multilayer sheets, multilayer electronic devices, etc. The multilayer sheet includes: a transparent film having a total light transmittance of 85% or more according to ISO 13468; a coating disposed on one side of the transparent film; and an adhesive layer disposed on the other side of the transparent film; the thickness of the adhesive layer after curing is less than twice the thickness of the coating. The multilayer sheets and multilayer electronic devices of the present invention do not peel off from the substrate even during repeated folding or rolling, and due to their excellent surface hardness, they exhibit excellent scratch resistance, dent resistance, etc. The multilayer sheets can be used as cover sheets for displays and offer excellent utilization for multilayer electronic devices.

The invention relates to a granulation process of large granular urea for coating. The preparation method comprises the following steps: taking screened granular urea as a granulation master batch, putting the master batch into a disc granulator, rotating a disc, spraying a urea formaldehyde solution as a granulation binder, and uniformly dispersing; the preparation method comprises the following steps: spraying a binder on a disc, simultaneously crushing small-particle urea to 10-80 meshes, uniformly scattering the crushed small-particle urea on the granulation master batch sprayed with the binder, rotating the disc for 1-3 minutes, completely wrapping the urea powder on the master batch, continuously spraying the binder and the urea powder, circulating for 4-15 times until the particle size is 3-4.75 mm, and introducing hot air for preliminary drying and preheating for 5-10 minutes. According to the invention, the granulation production cost is obviously reduced, the balling efficiency is improved, and the method is suitable for industrial production; the agglomeration powder coating granulation mode can reduce energy and time required by cooling, the large-particle urea prepared by the process is uniform and round in particle size, smooth in surface and high in particle strength, a coating material is easy to coat on the surface, the coating quality is improved, and the large-particle urea has great industrialization value.

The invention relates to the technical field of printing nickel screens, in particular to an acid and alkali resistant high-strength composite printing nickel screen and a preparation method thereof. The composite printing nickel screen comprises a printing nickel screen base body, and a nickel electroplating layer, a chromium electroplating layer and a photosensitive resin layer are sequentially arranged on the surface of the printing nickel screen base body from inside to outside. The photosensitive resin layer is prepared from a polyurethane-acrylate prepolymer and sulfydryl silicon resin through a sulfydryl-olefin click chemical reaction; the preparation method comprises the steps that S1, a core mold is put into a first nickel plating electroplating solution for nickel plating, a nickel net is separated from the core mold, and a printing nickel net base body is obtained; s2, the printing nickel net base body is put into a second nickel plating electroplating solution for nickel plating, and the surface of the printing nickel net base body is covered with an electroplated nickel layer; then plating chromium; and S3, preparing a photosensitive resin layer on the surface of the electroplated chromium layer. According to the invention, the strength, acid and alkali resistance and other properties of the printing nickel screen are comprehensively improved, the application problem of the traditional technology in a severe environment is solved, and a new technical path is provided for the high-performance printing nickel screen.

A polycarbonate composite composition is provided that exhibits improved surface hardness while maintaining impact strength. The polycarbonate composite composition comprising polycarbonate and specific ester repeating units according to the invention is characterized by excellent surface hardness while retaining the inherent basic physical properties of polycarbonate.

The invention discloses a polyurethane coating with hydrophobicity and multiple curing performance and a preparation method of the polyurethane coating. Aliphatic diisocyanate and unsaturated dihydric alcohol are used as raw materials to prepare an unsaturated polyurethane prepolymer containing-NCO end groups, then a hydroxyl-terminated silane coupling agent synthesized through sulfydryl double bond reaction is added for sealing, and the polyurethane coating is prepared. A series of silane-terminated unsaturated polyurethane is obtained through reaction and can be used for preparing a polyurethane coating with hydrophobicity and multiple curing performance; polyurethane with the main chain being a carbon chain containing double bonds and the end group being silane is synthesized, rapid ultraviolet light hardening of the surface of the coating is achieved, the end group silane rapidly migrates to the surface, the interior of the coating is crosslinked through multiple curing, the hydrophobicity, the adhesive force, the surface strength and other performance of the coating are effectively improved, and the coating has the good application prospect. The method has potential application prospects in the fields of buildings, automobiles, aerospace and the like.

The invention discloses an enamel glaze inorganic non-stick coating material and a coating method thereof. The enamel glaze inorganic non-stick coating material is prepared from 30%-40% of aluminum porcelain glaze, 20%-25% of silicon dioxide, 5%-10% of metal titanium powder, 8%-10% of titanium oxide, 5%-10% of albite powder, 1%-1.5% of carbon fibers, 0.3%-0.5% of a wetting agent, 20%-30% of purified water and 0.3%-0.5% of a defoaming agent. The method comprises the following process steps: cleaning a base material, preparing a coating, carrying out sand blasting on the surface of the base material in the step (1), spraying the coating in the step (2) on the base material in the step (3) to form a bottom coating, then cooling, spraying the coating in the step (2) on the base material in the step (4) to form a surface coating, and then baking and sintering in sequence. And finally, standing and cooling to obtain a finished product. According to the invention, not only is the problem of using on a single pot product solved, but also the hardness and the wear resistance are improved, and the overall service life is greatly prolonged.

The utility model discloses a decorative membrane and a decorative part, the decorative membrane comprises a base material layer, a texture layer and an ink layer, the texture layer and the ink layer are sequentially laminated on the base material layer, the decorative membrane further comprises a high extension layer arranged between the base material layer and the texture layer, and the elongation at break of the high extension layer is 130-150%. The decorative membrane has excellent tensile property, is easy to process, mold and inject, and can be suitable for decoration of complex shapes; the prepared plastic has excellent simulation degree, is suitable for decorative parts with wood grain-like and metal effects, has a good decorative effect, and can cover flow mark defects on the plastic surface in the injection molding process.

This invention discloses an additive repair method for a clutch drive shaft platform based on laser cladding technology, comprising: preheating the clutch drive shaft and Fe-5 iron-based powder before welding; using Fe-5 iron-based powder to perform laser melting additive manufacturing on the worn area of ​​the clutch drive shaft with no machining allowance; and subjecting the laser-melted additively manufactured clutch drive shaft to slow cooling after welding and supplementary machining, thus completing the clutch drive shaft repair. This invention transforms subtractive repair into additive repair, selecting Fe-5 iron-based powder as the additive repair powder, so that after laser cladding, its surface hardness reaches or exceeds that of the original carburized substrate surface, allowing direct cladding on the original clutch drive shaft platform, restoring the clutch drive shaft, which cannot be repaired by grinding, to its original process level. Simultaneously, the wear resistance of the repaired platform is verified through fretting wear testing.

The invention relates to the technical field of coatings, in particular to a photo-thermal composite curing glass coating composition, a preparation method thereof and a coating. The invention discloses a photo-thermal composite curing glass coating composition which comprises epoxy resin, an epoxy flexibilizer, an acrylate monomer, a diluent, an acrylate cross-linking agent, a cationic photoinitiator, a free radical photoinitiator, a coupling agent, a sensitizer and other additives. The photo-thermal composite curing composition simultaneously contains a cationic system and a free radical system, free radical polymerization and cationic polymerization can be carried out, an interpenetrating network is formed in the curing process, and the photo-thermal composite curing composition has excellent adhesive force, flexibility, water soaking resistance, strong wine soaking resistance and boiling resistance when being used as a glass coating.