167 results about "Silvering" patented technology

Compositions and methods for silver plating onto metal surfaces such as PWBs in electronics manufacture to produce a silver plating which is greater than 80 atomic % silver, tarnish resistant, and has good solderability.

The invention relates to a preparation method of nickel-plated and silver-plated aromatic polyamide conductive fibers, which comprises the following concrete steps of: a. washing and oil removal; b. coarsening: increasing the surface roughness and the surface wettability of fibers; c. sensitizing: soaking the fibers by adopting an aqueous solution formed by stannous chloride and hydrochloric acid; d. activation: soaking the fibers by adopting an aqueous solution formed by palladium chloride and hydrochloric acid; e. chemical nickel plating; f. sensitizing; g. activation; h. chemical silver plating; and i. coating protection. The prepared high performance nickel-plated and silver-plated aromatic polyamide conductive fibers have good electric conductivity, characteristics of heat resistance, flame retardance, light weight and high strength and functions of eliminating static electricity, conducting electricity and transmitting electrical signals. Therefore, the prepared nickel-plated and silver-plated aromatic polyamide conductive fibers can be widely applied to special departments of aviation, space flight, war industry, communication and the like and can also satisfy the clothing and equipment requirements of staffs engaging radars, television relaying and the like.

An optical signal transceiver subassembly is mounted on a lead frame for further attachment to an electronic printed circuit board. The optical subassembly is comprised of a solid-state laser, a pair of photo-detectors, an over-mold of transparent material having shapes forming the exposed surface thereof, the surface and a selective silvering of a portion thereof defining a beam-splitter mirror and an interior reflective focusing surface, preferably in the shape of a partial cylindrical surface. The beam-splitter mirror is lightly silvered and the cylindrical surface is silvered to enhance the reflection of the laser beam. The optical subassembly is further enclosed with a housing incorporating a pair of lenses and alignment pins. The lenses focus the data stream of optical light signals onto the end of the outgoing optical fiber and the data stream of optical light signals from the incoming optical fiber onto and through the beam-splitter and onto a first photo-detector. The beam-splitter and the partial cylindrical surface reflect the laser beam portion deflected from the primary laser beam path onto a second photo-detector to provide a data stream from which the operation of the laser may be monitored, thereby insuring the proper transmission of the data signals provided to the laser through the lead frame and its associated electronic connections.

The invention provides a preparation method of silver-plated copper powder, which comprises the following steps: a, putting copper powder of which the granularity is 200-800 meshes into an alkali solution of which the weight concentration is 3-15% for washing with alkali, and then, washing with water, filtering and drying; b, putting the copper powder in the step a into an acid solution of which the weight concentration is 3-15% for washing with acid, washing with water to the neutrality, and then, filtering and drying; c, under the condition that the proportion by weight of copper powder to silver nitrate is 100:1-10, taking the silver nitrate, and dissolving the silver nitrate into water to form a silver nitrate water solution; d, under the condition that the proportion by weight of copper powder to ethylenediamine tetraacetic acid disodium salt is 100:1-10, taking the ethylenediamine tetraacetic acid disodium salt, dissolving the ethylenediamine tetraacetic acid disodium salt into water to form a water solution, putting the copper powder in the step b into the water solution for uniformly stirring, then adding the silver nitrate water solution in the step c and 0.05-5% copper powder weight of reducing agent for reacting for 0.5-4 hours, and cleaning, centrifuging and filtering to obtain the silver-plated copper powder; and e, adding the silver-plated copper powder after reaction into an organic acid ester mixed solution for soaking for 0.5-3 hours, and filtering and drying to obtain a product.

The invention relates to a silver plating solution for chemical silvering of polyester fabrics, a silver plating method of the silver plating solution and an anti-tarnishing protection method of a plating layer. The silver plating solution is divided into a silver salt solution and a reducing agent solution, wherein constituents and concentrations of the silver salt solution are as follows: 5 to 10g/L of AgNO3, 55 to 65mL/L of ammonia water, 15 to 25mL/L of ethidene diamine, 5 to 10g/L of sodium thiosulfate and 5 to 10g/L of potassium hydroxide; and the constituents and the concentrations of the reducing agent solution are as follows: 5 to 10g/L of glucose, 1 to 5g/L of potassium sodium tartrate, 35 to 45mL/L of ethanol, and 70 to 80mg/L of polyethylene glycol 1000. The polyester fabrics with the plating layer prepared by the invention is durable in conductivity, excellent in anti-electromagnetic shielding capacity, and good in anti-tarnishing property, thereby being applied to preparation of conductive foam, conductive adhesive tapes, conductive hasps, shielding clothes and shielding caps and the like.

The invention belongs to the technical field of materials, relates to the functional material technology, in particular to electromagnetic shielding material technology, and relates to the preparation technology of the materials. According to a nickel plating silvered glass bead, the glass bead is adopted as a carrier, a nickel plating layer enables a powder body to be good in magnetic conductivity, a surface silvered layer enables the powder body to be good in electrical conductivity, and a nickel layer and a surface silver layer are respectively obtained through a chemical plating method. The glass bead is adopted as the carrier, the middle is the nickel layer, the surface is the silver layer, and the ratio between nickel and silver is between 1.5 and 4.0. A preparation method of the nickel plating silvered glass bead comprises the processes of preprocessing, chemical nickel-plating, chemical silvering and postprocessing. The power body has good magnetic conductivity and excellent electrical conductivity, electromagnetic shielding frequency range is wide, a good electromagnetic absorption effect is achieved in low frequency, and a good electromagnetic wave reflective effect is achieved in medium-high frequency. The nickel plating silvered glass bead is uniform in plating densification, good in intensity and impact resistance, small in density, suitable for the field of electromagnetic shielding, and particularly suitable for electromagnetic absorption, electromagnetic absorption and heat-conductive electricity-conductive materials.

The invention provides a chemical silvering method for PS (polystyrene) microspheres, which comprises the following steps: coarsening the surfaces of PS microspheres; sensitizing and activating the coarsened PS microspheres; adding the treated PS microspheres into a silver-ammonia solution while stirring; adding a certain amount of reducer to finish the chemical surface silvering of the PS microspheres; and filtering, separating, washing, and drying in vacuum to obtain Ag/PS compound particles. The PS silvering method has a simple preparation process and simple composition of raw materials, and is easy to implement large-scale production; and the density of the prepared PS/Ag compound particles is less than 1.2*10<-3>kg.cm<-3>, and the resistivity is less than 4.2*10<-4>ohm.cm, thereby ensuring that the prepared PS/Ag compound particles have light weight and high conductivity.

The electrical wire leads of miniature lights or LED's in a series-wired Christmas light string are gold or silver plated to resist corrosion. The wire leads of any shunt components used in the sockets of the light string can also be plated for corrosion resistance.

The invention relates to a piece of silver-plated cloth with a rare earth-shielding composite layer, comprising a piece of silver-plated cloth. The silver-plated cloth is characterized by comprising the rare earth-shielding composite layer, and the rare earth-shielding composite layer is formed by dissolving the following components in a solvent by mass percentage: 50-70 parts of rare earth and 30-50 parts of composite, wherein the composite comprises the following components by mass percentage: 6-10 parts of monoatomic carbon, 6-10 parts of boron nitride, 6-10 parts of boron carbide, 6-10 parts of neodymium oxide, gadolinium oxide and erbium oxide as well as 6-10 parts of barium sulfate. The silver-plated cloth with the rare earth-shielding composite layer can effectively shield various ionizing rays (x, alpha, beta or gamma) as well as electromagnetic radiation, and also has the function of shielding infrared rays; and the cloth achieves light weight and softness, and can be applied to the ray shielding of the fields of frocks, war industry, operations, electricians, and the like. The invention also relates to a method for preparing the silver-plated cloth with the rare earth-shielding composite layer and silver-plated clothes with the rare earth-shielding composite layer.

The invention provides a copper-free silver mirror which has sharp image and is not easy to fall off, which comprises a glass substrate; wherein, silver layers, mirror primer and mirror finish are arranged on the surface of the glass substrate in sequence; the thickness of the silver layer is 900-1000mg/m. The manufacturing method of the copper-free silver mirror comprises the following steps: 1) using polishing powder containing 70%-75% of CeO2 by weight to polish the surface of the glass substrate, carrying out deionized water rinsing on the surface, spraying active agent, standing for a period of time and carrying out deionized water rinsing again; 2) spraying catalyst solution which consists of the following components by weight percentage: 28-30% of PdC2, 5%-6% of Ru, 1%-1.2% of HC1 and the rest of deionized water; 3) coating silver layer with thickness of 900-1000 mg/m and passivant on the surface of the glass substrate; 4) carrying out deionized water rinsing and then drying; 5) curtaining the mirror primer and mirror finish. The mirror is sprayed with catalyst containing PdCl2 and the passivant containing Snf2 are sprayed rather than cooper layer, therefore, the image is sharper and not easy to fall off.

The invention relates to a preparing method of antioxidant silvering copper powder. Sodium hypophosphite is adopted to serve as a reducing agent, deionized water is adopted to serve as a solvent, sodium hypophosphite reduction liquid is prepared, copper powder is adopted to serve as a base material to be added into the reduction liquid, PVP is added, ammonium hydroxide is added to adjust the pH value, and the pH value is stabilized to 11; silver nitrate serves as a silver source, the deionized water serve as a solvent to prepare oxidation liquid, an EDTA-2Na complexing agent is added, stability of plating liquid is improved, and the problem that in the silvering process, silver ions are released too fast is obviously solved; solutions are mixed, meanwhile, magnetic stirring is carried out, the adding temperature is kept to range from 30 DEG C to 80 DEG C, reaction is carried out for 20 min, centrifuging is carried out, and one-time-silvering copper powder is obtained; the one-time-silvering copper powder serves as the base material, the above steps are repeated twice, and third-time-silvering copper powder is obtained. High-temperature oxidation resistance of silver plated copper powder prepared through the method is excellent, and the method is suitable for replacing conductive phase silver powder of electronic paste.

The invention discloses a method to control the distributing homogeneity of silver- stannic oxide electric contact material additive. Before chemical silvering, taking chemical coppering to the SnO2 powder, takes oxide treatment; taking chemical silvering under ultrasonic joint together with additive. By using the invention, the distribution homogeneity of silver-stannic oxide material would be controlled, and the stannic oxide and silver basal body has good wetting property. The electric contact made following the inventioin has good sintering activity and machine shaping. It can be used to manufacture thread material and plural shapes of contacts.

The invention belongs to the technical field of conductivity and discloses a nylon fiber surface chemical silver plating method which comprises the following steps: (1) removing oil, namely putting afixed amount of a fiber into a clean container, and putting an alkali oil remover for reducing surface tension of the fiber into the container; (2) carrying out sensitization treatment with a sensitization liquid A, namely completely soaking the fiber obtained in the step (1) into the sensitization liquid A prepared on site, and enabling the surface of the fiber to adsorb a layer of a metal with catalysis activity; (3) carrying out sensitization treatment on a sensitization liquid B, namely completely soaking the fiber obtained in the step (2) into the sensitization liquid B prepared on site,and forming hydrogen bonds by carbonyl functional groups on the surface of the fiber and carbonyl functional groups in the sensitization liquid B; (4) carrying out activation, namely completely soaking the fiber obtained in the step (3) into a silver amino solution prepared on site; (5) putting a fixed amount of glucose restore into the solution obtained in the step (4). By adopting the method, asilver plated layer with a solid plated layer can be made, and a conductive fiber with good conductivity can be manufactured.

The invention discloses an alkaline semi-bright non-cyanide immersion chemical silvering solution and a preparation method thereof. The silvering solution is stable and can be preserved for more than three years at the room temperature, the efficiency is high, the bonding force of a plating layer is good, and the surface of the plating layer is flat, semi-bright and good in anti-tarnish property. The silvering solution is easy to maintain, and only silver ions need to be supplemented during long-term operation; and in addition, the silvering solution is high in anti-pollution capacity and copper ion tolerance.

The gilding and silver-plating process of through-carved work includes the following steps: grinding the through-carved work and printing coat, bedding putty, spraying and brushing prime paint, using matched flow thick material to cover prime paint, after 5-10 hr., sticking pure golf foil or pure silver foil on the surface, pressurizing and planishing, spray-coating finish coat by using transparent lacquer, after 24 hr. applying polish wax and polishing. Said invention is simple in process, and its gilding and silver-plating effect is good, and its application is extensive.

The present invention relates to the field of air and water purifying technology, and is the preparation of silver-carrying foamed metal with sterilizing function. Foamed metal with certain pores or porosity suitable for filtered fluid is selected as carrier, and its surface is coated with silver or silver containing compound via electroplating, chemical plating or other physical or chemical process to produce the silver-carrying foamed metal with sterilizing function. The present invention has the features of great silver carrying surface area, high carrier strength and high bactericidal efficiency. For ever higher pathogenic bacteria killing capacity, hydroxyapatite and titanium dioxide with synergistic effect are also used. This kind of foamed metal has wide application foreground in purifying air and water.

A chemical silvering solution is provided. The chemical silvering solution comprises a silver salt, a complexing agent, a pH conditioner and additives. The additives comprise benzotriazole and polyethylene glycol. The weight ratio of the benzotriazole to the polyethylene glycol is 1:2.5-50. The polyethylene glycol is PEG-1000 or PEG-400. The pH of the chemical silvering solution is 8.2-10.2. A chemical silvering method using the chemical silvering solution is also provided by the invention. Products obtained by using the chemical silvering solution are compact and uniform in appearance, while products obtained by using silvering solutions of the same kind in the market have appearances with protruding and nonuniform particles and even have skip plating in local parts. The chemical silvering solution has a longer time for starting decomposition than the silvering solutions of the same kind in the market and is more stable.

The invention discloses a solar glass reinforced plastic back plate condensing lens assembly and a processing method of the condensing lens assembly. The condensing lens assembly comprises a lens set, a glass reinforced plastic back plate and support assemblies, wherein the lens set consists of a plurality of ultrathin plain glass lenses; the glass reinforced plastic back plate is made of SMC (Sheet Molding Compound) molded glass reinforced plastic; and the support assemblies comprise support rods, upper cover plates and lower cover plates. The processing method comprises the steps of dividing to form the lenses with equal length according to the dimension of the glass reinforced plastic back plate, combining the lenses into the fan-shaped lens set according to a certain layout, silvering the back surface of glass by a chemical glass silvering method or a nano silvering method, coating ultraviolet protective paint or protective paint with an adhesive force greater than Grade 1 on the surface of a silver layer, fabricating the glass reinforced plastic back plate, gluing the lens set and the glass reinforced plastic back plate, and sealing the edge of the lens set with a weather-proof adhesive or a structural adhesive. The condensing lens assembly is high in reflectivity and good in condensation performance, and has a high adaptive capacity to an environment.