32results about How to "Uniform coating structure" patented technology

The invention relates to a method for preparing compact silver-coated copper powder by using the one-pot method. The silver-coated copper powder is in a coated core-shell structure, a core layer is made of copper, and a shell layer is made of silver. The preparation method includes: adding ammoniacal copper solution prepared by copper sulfate into aqueous solution containing reducing agent and dispersing agent to obtain copper powder suspension; adding water-soluble organic chelating agent into the suspension containing copper powder; adding ammoniacal silver solution prepared by silver nitrate into the suspension containing the copper powder to enable silver ions and the copper powder to be in a displacement reaction; after the displacement reaction finishes, additionally adding a certain amount of weak reducing agent to restore residual silver ions into silver; and filtering, washing and drying to obtain silver-coated copper powder with different grain diameters of 0.8-5 micrometers. The obtained silver-coated copper powder is uniform in silver coating of the shell layer, compact, good in conductivity, high in high-temperature oxidation resistance, and capable of being used for preparation of various electrode slurry sintered in the air.

The present invention is one kind of composite hot sprayed Ti-Fe-Ni-C powder capable of forming composite TiC / Fe-Ni alloy coating and its preparation process. The composite Ti-Fe-Ni-C powder containing Ni in the amount of 32-45 wt% of Fe+Ni content and Ti+C in over 70 wt% is prepared with sucrose as the precursor of C. The TiC / Fe-Ni alloy coating formed through hot spraying with Fe-Ni alloy as the adhering phase has the advantages of small stress, low porosity, high bonding strength between the Fe-Ni alloy and TiC, excellent high temperature antiwear and anticorrosion performance and small TiC grain size.

The invention discloses a preparation method of a Cr / CrN / (Ti, Al, Si, Cr)N composite hard coating. The preparation method comprises the steps of pretreatment, heating, plasma cleaning, Cr adhesion layer preparation, CrN transition layer preparation, (Ti, Al, Si, Cr)N anti-wearing layer preparation and the like. As a plasma enhanced intermediate frequency reaction magnetron sputtering technology is adopted in the preparation method provided by the invention, the ionization rate of a target material is substantially increased, so that the surface nano-hardness of the prepared composite hard coating can reach above 34 GPa, and the membrane base bonding force grade of the hard coating is HF1-HF2 of German Standard VDI3198. Therefore, the preparation method is suitable for preparation of the coating for high-speed dry-type cutting stainless steel, iron-based high-temperature alloy, high-strength constructional steel and anti-wearing cast steel cutters. The coating is simple in process and suitable for industrial production.

The invention discloses a ball mill liner remanufactured surface coating part and a manufacturing method thereof, which belong to the field of construction machinery remanufacture. It includes a substrate and a coating layer, and the mass percentage of the substrate composition is C0.30~0.44wt%, Si1.50~2.0wt%, Mn0.8~1.40wt%, Cr2.0~2.8wt%, Mo≦0.3wt %, Ni≦0.3wt%, Re0.02wt%, P and S total 0.04wt%, and the rest is Fe; the coating layer contains WC-Co powder with a volume fraction of 95-98% and 2-5% Cr , the Cr / Co weight ratio is 0.2-0.5. The invention can endow the parts with special properties such as wear resistance and corrosion resistance, improve the reliability of the parts and prolong the service life of the parts, especially the wear resistance of the working surface of the wear-resistant liner of the ball mill.

The invention discloses a ZnAlMgTiSiB anti-corrosion coating for steel structure, which is composed of the following components in mass percentage: Zn 41%-73%, Al 15%-55%, Mg 0.5%-2%, Ti 0.5%-5%, Si 0.7% to 3%, B 1% to 2%. The corrosion products of Ti, Si and B in the ZnAlMgTiSiB anti-corrosion coating of the invention are insoluble in water, which reduces the coating corrosion rate and improves the anti-corrosion life of the steel structure. The invention also discloses a method for preparing a ZnAlMgTiSiB anti-corrosion coating for steel structures, the method comprising: 1. pretreating the surface of the steel structure to a level above Sa2.5; The surface of the steel structure after treatment forms a ZnAlMgTiSiB coating. The method of the invention reduces the pores in the coating and improves the bonding strength between the coating and the steel structure.

The invention discloses a conductive polymer-carbon coated silicon oxide composite material and a preparation method thereof. The conductive polymer-carbon coated silicon oxide composite material comprises a conductive polymer, a silane coupling agent, carbon and silicon oxide, wherein the carbon is directly coated on a surface of a silicon oxide particle, the silane coupling agent is absorbed toa surface of the carbon, and the conductive polymer is embedded into carbon gaps and also is uniformly coated on the surface of the carbon by a bridge chain effect of the silane coupling agent. The preparation method of the conductive polymer-carbon coated silicon oxide composite material comprises three steps of highly mixing the silicon oxide and a carbon source, performing high-temperature sintering (curing and carbonization) and coating the polymer. The prepared composite material is very uniform in coating structure and has relatively low volume expansion effect and excellent electrochemical performance, the initial charge-discharge efficiency can be obviously improved, and particularly, relatively poor cycle property of a silicon oxide negative electrode material is improved.

The invention discloses an iron-based wear-resistant composite material and a preparation method thereof. The preparation method includes the following process: using a laser cladding method to prepare an iron-based wear-resistant composite coating on the surface of an iron-based alloy base material with iron-based composite powder. layer to obtain the composite body; the surface of the composite body is polished and cleaned; then laser shock is carried out to realize the surface enhancement treatment of the iron-based wear-resistant composite coating; the composite body subjected to laser shock on the surface is subjected to cyclic heat treatment to eliminate residual stress; The iron-based composite powder is micron La 2 o 3 Powder, Micron Al 2 o 3 The powder and micron FeCrNiSiB powder are uniformly mixed, cryogenically treated with liquid nitrogen circulation, and dried. In terms of mass percentage, the iron-based composite powder contains: 0.05% to 10% of micron La 2 o 3 Powder, 0.1%~45% micron Al 2 o 3 powder and 50% to 95% micron FeCrNiSiB powder. The invention improves the service life of the iron-based alloy matrix by preparing a composite coating with good performance on the surface of the iron-based alloy material, and has great significance for the repair and reconstruction of engineering machinery.