67 results about "Nickel silver" patented technology

The invention discloses a preparation method of nickel-silver alloy steel strip for battery case. The method uses mild-carbon steel strip as substrate through chemical degreasing, electrolytic degreasing and acid cleaning, characterized by the following steps: A. putting the mild-carbon steel strip in nickel plating bath, plating for 1 to 5min to form nickel coating layer with the sediment thickness of single side or double-side of 1 to 5 microns; B. putting the steel strip plated with nickel layer in the silver plating bath for 0.5 to 5min, controlling the silver coating layer settled on the nickel coating layer to be 0.1 to 1.0 microns; C. thermal treatment, putting the steel strip of nickel-silver coating layer in a bell type furnace to process thermal treatment at 200 to 300 DEG C, keeping temperature for 1 to 10 hours, forming a nickel-silver alloy steel strip with thickness of 0.1 to 2.0 microns; and D. finish rolling, conveying the nickel-silver alloy steel strip with timeliness during the thermal treatment to finishing mill to roll. The invention is mainly used to prepare nickel-silver alloy steel strip for battery case.

A packfong belt applying to the shell of piezoelectric crystal oscillator, the material of the copper alloy is prepared by adding nickel and zinc element, and the main chemical constituent is as following: Cu: 62.0 to 66.0 percent; Ni: 16.5 to 19.5 percent; Zn: residual. The workflow is: material checking and accepting - batching - melting - sampling and analyzing (adjusting constituent) - rolling in holding furnace - sampling and analyzing (adjusting constituent) - horizontal continuous casting - batching on - milling - cool cogging rolling - end shearing - intermediate annealing - cold rolling - intermediate annealing - fine rolling - end item annealing - cutting - end item quality inspection - packaging and warehouse-in. The invention settles many technical problems, such as the low tensile strength, the high dimensional tolerance and the poor surface finish quality of the present packfong belt, and it also improves the the shielding property and corrosion resistance.

To provide a silver-white copper alloy which represents a silver-white color equivalent to that of nickel silver and is excellent in hot workability and the like. The silver-white copper alloy includes 47.5 to 50.5 mass % of Cu, 7.8 to 9.8 mass % of Ni, 4.7 to 6.3 mass % of Mn, and the remainder including Zn, and the silver-white copper alloy has an alloy composition satisfying relationships of f1=[Cu]+1.4×[Ni]+0.3×[Mn]=62.0 to 64.0, f2=[Mn] / [Ni]=0.49 to 0.68, and f3=[Ni]+[Mn]=13.0 to 15.5 among a content [Cu] mass % of Cu, a content [Ni] mass % of Ni, and a content [Mn] mass % of Mn, and has a metal structure in which β phases at an area ratio of 2 to 17% are dispersed in an α-phase matrix. The copper alloy is provided as a hot processing material or continuous casting material formed by performing one or more heat treatments and cold processes on a hot processing raw material formed by performing a hot process on an ingot or a casting raw material obtained by continuous casting.

The composite multilayer Ni, Ag, Pt and Rh electroplating process includes successive Ag pre-electroplating step, Ni-electroplating step, Ag-electroplating step and Pt and Rh electroplating step, with special requirement in electrolyte composition and pH value, electroplating temperature and time, electrode current density and other technological parameters. The said electroplating process has no problem of color change in Ag plated surface, and the coating is bright, smooth, beautiful, fast and without color change.

The invention relates to the technical field of the preparation of metal powder materials and particularly discloses a preparation method for core-shell structural nickel-silver bimetallic powder. The preparation method comprises the following steps of: adding nickel powder and a dispersing agent in an ethanol-water mixed solvent, and stirring to obtain a nickel powder dispersing solution; preparing hydrazine hydrate solution with the hydrazine hydrate concentration of 2.5 mol / L, and adjusting the pH value of the hydrazine hydrate solution to more than 10 to obtain a reducing agent solution; mixing the nickel powder dispersing solution with the reducing agent solution to obtain a reaction solution A; dropwise adding an ammonia-silver solution in the reaction solution A and reacting for 70-100 minutes to obtain turbid liquid; performing centrifugal separation, washing and vacuum-drying the obtained solid to obtain the core-shell structural nickel-silver bimetallic powder. The preparation method provided by the invention has simple process; the obtained core-shell structural nickel-silver bimetallic powder has the advantages of controllable thickness of a silver coating layer, narrow distribution of grain diameter, good dispersing property and high vibrating density.

The invention discloses a variable-scale boron-nitrogen graphene modified layer brazing filler metal. The brazing filler metal comprises a variable-scale modified layer composed of a boron-nitrogen graphene reinforced alloy layer which is formed in an upper surface layer, a brazing filler metal layer which is formed in a middle layer and a boron-nitrogen graphene coated foam metal layer which is formed in the lower surface layer, and the preparation method comprises the following steps that a silver brazing material sheet or a gold brazing filler metal sheet is selected, firstly, a boron-nitrogen graphene reinforced nickel-based alloy is sputtered on the upper surface of the brazing filler metal sheet, wherein the nickel-based alloy is a binary or ternary nickel-based alloy consisting of nickel, palladium, gold and copper, then a boron-nitrogen graphene coated foam metal layer is subjected to vapor deposition on the lower surface of the brazing filler sheet, wherein the foam metal is binary nickel-based alloy consisting of nickel-chromium, nickel-gold, nickel-silver or nickel-copper; and the prepared modified layer brazing filler metal can be used for connection of high-nitrogen steel and high-strength steel, the tensile strength of the high-nitrogen steel and the high-strength steel subjected to braze connection is not lower than 500 MPa. The brazing filler metal prepared through the method has a variable-scale layer and can generate a nano-scale effect, so that the mechanical property of the brazing filler metal can be synergistically enhanced, and the welding strength ofthe high-strength steel and the high-nitrogen steel can be improved.

The invention discloses a preparation method of UV light-cured silver-coated nickel conductive paste. Pretreated nickel powder and silver ammine complex solution are mixed, heated in a water bath at 60-90° C. for 6 hours, and then added with polyvinylpyrrolidone to react for 1-2 hours. , and then centrifuged and cleaned to obtain silver-coated nickel powder; the photosensitive resin and the silver-coated nickel powder were mixed uniformly to obtain a silver-coated nickel conductive adhesive; the conductive adhesive was screen-printed and irradiated under an ultraviolet lamp. The preparation method of the low-temperature polymer conductive paste of the present invention uses precious metal silver to coat base metal nickel, and the preparation process does not require high-temperature sintering and curing, which effectively reduces the production cost; the prepared silver-coated nickel electronic paste not only has excellent electrical conductivity , can also be stored for a long time.

To improve the mechanical strength and vibration resistance of a sintered bearing and to prevent damage to the rotary shaft of the sintered bearing. A sintered bearing 20 according to the present invention is formed of a sintered body that uses nickel silver (Cu-Ni-Zn) as a base material. In this sintered bearing 20, P is not added into the sintered body, or alternatively, the P content in the sintered body is less than 0.05% by mass in terms of the mass ratio to the total mass. Consequently, crystal grains constituting the sintered body can be miniaturized. Specifically, the average crystal grain size of the crystal grains that constitute the sintered body in this sintered bearing 20 is 20 [Mu]m or less. Consequently, it is possible to improve the mechanical strength and vibration resistance, while preventing damage to the rotary shaft.

A packfong belt applying to the shell of piezoelectric crystal oscillator, the material of the copper alloy is prepared by adding nickel and zinc element, and the main chemical constituent is as following: Cu: 62.0 to 66.0 percent; Ni: 16.5 to 19.5 percent; Zn: residual. The workflow is: material checking and accepting - batching - melting - sampling and analyzing (adjusting constituent) - rolling in holding furnace - sampling and analyzing (adjusting constituent) - horizontal continuous casting - batching on - milling - cool cogging rolling - end shearing - intermediate annealing - cold rolling - intermediate annealing - fine rolling - end item annealing - cutting - end item quality inspection - packaging and warehouse-in. The invention settles many technical problems, such as the low tensile strength, the high dimensional tolerance and the poor surface finish quality of the present packfong belt, and it also improves the the shielding property and corrosion resistance.

The invention relates to a high-strength zinc-nickel-nickel alloy. The chemical composition of the alloy contains: Zn 38%-45%, Ni 13%-17%, and the balance Cu, wherein the alloy composition includes Cu+Zn+ Ni content ≥ 99.5%. Its chemical composition can also contain: one or two of the three elements Be, Ti, and Zr, and the contents of the three elements of Be, Ti, and Zr are respectively: Be 0%~0.5%, Ti 0%~ 0.5%, Zr 0% ~ 0.4%. The alloy can maintain the corrosion resistance, weldability and color of the original various zinc white copper, and has higher tensile strength; because high zinc and other elements are used to replace part of copper and nickel, the cost of the invented alloy is lower than that of commercial zinc Cupronickel can replace the existing zinc-nickel-nickel copper to make various components; the alloy has good cold and hot processing performance, and can be used to produce pressure-processed products and cast products, which is suitable for industrial production.

An electrical plug connector (1) in the form of a socket contact with a contact inner part (3) for making electrical contact with a pin (2), and with an outer spring (4) which surrounds the contact inner part (3), the contact inner part (3) is, according to the invention, formed from nickel silver.

A sintered bearing is made of a sintered compact containing nickel silver (Cu—Ni—Zn) as a base. In the sintered bearing, P is not added in the sintered compact. Alternatively, a content of P in the sintered compact is less than 0.05 mass % in terms of mass ratio to a total mass. Consequently, crystal grains constituting the sintered compact can be micronized. In particular, in the sintered bearing, an average crystal particle diameter of the crystal grains constituting the sintered compact is 20 μm or less. Consequently, the mechanical strength and the vibration resisting properties can be improved, and the rotation shaft can be prevented from being damaged.

The invention provides a technology for plating silicon wafers with nickel silver. The technology comprises the following steps of pretreatment: the surfaces of the silicon wafers are cleaned and aresubjected to atomic activation; primary nickel plating: the surfaces of the silicon wafers are plated with primary nickel; nickel sintering: nickel layers and silicon layers are combined; secondary nickel plating: the surfaces of the silicon wafers are plated with secondary nickel; and silver plating: the surfaces of the silicon wafers are plated with silver. The technology has the beneficial effects that the bonding force of the nickel layers and the silicon layers can be effectively increased through secondary nickel plating, oxidation of the nickel layers can be effectively prevented through silver plating, the bonding force of the silicon wafers and soldering paste can be higher through nickel silver plating, silver nitrate is used as a silver plating solution and is safer and more reliable in production, transportation and storage processes, the production cost is saved, and the nickel silver plating technology has the advantages of low production cost, high reliability and long service life of the silicon wafers.

The invention discloses a manufacturing technology for improving a Pb-free solder property of a packfong strip. The manufacturing technology of the packfong strip comprises the steps of casting, surface milling, rough rolling, edge cutting, intermediate annealing, degreasing and cleaning, intermediate rolling, intermediate annealing, degreasing and cleaning, finished product rolling, finished product annealing, stretch bending and straightening, finished product cleaning and itemizing and storing, the finished product rolling working rate is 30 to 45%, and the roller surface roughness Ra adopted in the finished product rolling is less than or equal to 0.1[mu]m and larger than or equal to 0.3 [mu]m; the annealing temperature of the finished product is set to be 425 to 535 DEG C, and heat preservation is performed for 7 to 12 hours at the temperature; the concentration of the finished product cleaning acid liquor is controlled to be 4 to 9%; all of the finished product rolling, the finished product annealing and the finished product acid liquor cleaning improve the Pb-free solder property of the packfong strip.