170 results about "Silvering" patented technology

A process for forming a silver coating on a surface of a vitreous substrate is described. The process comprises an activating step in which said surface is contacted with an activating solution, a sensitising step in which said surface is contacted with a sensitising solution, and a subsequent silvering step in which said surface is contacted with a silvering solution comprising a source of silver to form the silver coating. The process is characterised in that said activating solution comprises ions of at least one of bismuth (III), chromium (II), gold (III), indium (III), nickel (II), palladium (II), platinum (II), rhodium (III), ruthenium (III), titanium (III), vanadium (III) and zinc (II).

The inventors have conducted vigorous studies, and discovered as a result that it is possible to form a silver layer having a high reflectance of about 90 to 99% in a visible light are a by setting a grain size of an outermost surface of a silver plated layer within a range of 0.5 μm or more to 30 μm or less.

A process for chemically plating Ag on the surface of hollow glass micro-bead includes such steps as sensitizing and activating its surface and plating Ag by in-situ chemical deposition. Its product is composed of hollow glass micro-bead as core, activated layer and Ag layer has lower infrared emissivity and a certain radar wave absorpitivity.

The present invention discloses silver plated hollow glass bead and its surface sliver plating process. The technological process includes soaking hollow glass bead in alkaline solution to clean, roughen and surface hydroxylate; soaking the treated hollow glass bead in argentamine white stirring and heating to react for certain time, and adding reductant to activate and silver plate the hollow glass bead. Compared with traditional technology, the present invention has the advantages of simplified pre-treatment, shortened production period and low cost. The prepared silver plated hollow glass bead has excellent conducting performance and may be used as electromagnetic shielding material.

The invention relates to a silver electroplating technology for molybdenum foils used for panel substrate interconnecting flakes of solar cells of a space craft. The technology comprises the steps of molybdenum foils buffing and degreasing treatment, acid cleaning activation treatment, silver metal plasma injection, high temperature annealing treatment, silver leaching treatment, silver electroplating, EDS testing on the constituents of an electroplated layer, shape and morphology SEM observation, passivation for the electroplated molybdenum foils, and testing on the conductibility and the weldability of the electroplated molybdenum foils. The vacuum metal plasma injection technology provided by the invention comprises the following steps: injecting metallic elements as per certain energy and dosage into the molybdenum foil interconnecting flake material processed by buffing, degreasing treatment and acid cleaning activation treatment; carrying out silver leaching treatment after vacuum high temperature annealing; and carrying out non-cyanide silver electroplating so as to achieve a silver plating layer on the molybdenum foils, which is characterized by seamlessness, fine and round crystal grains and dense structure. The passivation treatment for the electroplated molybdenum foils gives the silver plating layer the ability to prevent the silver plating layer from being corroded by sulfide. Meanwhile, the conductibility and the weldability of electroplated aluminum foils are greatly improved without being affected by the passivation treatment.

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.

A method is provided for depositing a whisker resistant tin-based coating layer on a surface of a copper substrate. The method is useful for preparing an article comprising a copper substrate having a surface; and a tin-based coating layer on the surface of the substrate, wherein the tin-based coating layer has a thickness between 0.5 micrometers and 1.5 micrometers and has a resistance to formation of copper-tin intermetallics, wherein said resistance to formation of copper-tin intermetallics is characterized in that, upon exposure of the article to at least seven heating and cooling cycles in which each cycle comprises subjecting the article to a temperature of at least 217° C. followed by cooling to a temperature between about 20° C. and about 28° C., there remains a region of the tin coating layer that is free of copper that is at least 0.25 micrometers thick.

The invention discloses a method for preparing a carbon nano tube silvered acrylic acid series electromagnetic shielding coating. The method comprises the following steps of: plating a layer of nickel on the surface of CNTs (carbon nano tubes) by adopting a chemical plating method, and then performing chemical silvering to obtain a silvered CNTs composite filler which takes the CNTs with high length-diameter ratio as cores and takes a uniform silvering layer as a shell; and mixing the prepared silvered CNTs, acrylic resin, ethyl acetate and n-butyl alcohol in a ratio, and dispersing the mixture uniformly to finally prepare the electromagnetic shielding coating with good electric conductivity and electromagnetic shielding effect. The layer of nickel is uniformly plated on the surface of the CNTs before the chemical silvering so that the bonding force between the silvering layer and the CNTs is improved and the silvered CNTs have better electric conductivity and dispersibility and are favorable for application in the electromagnetic shielding material field.

The invention discloses a method for preparing rodlike ultrafine silver powder by carrying out chemical silvering on surfaces of attapulgite nanofibers, and the method comprises the following steps: firstly, acidizing the natural soils of attapulgite by using a hydrochloric acid solution; then, carrying out oxidant-solution soaking and adsorption on the acidized attapulgite by using a silver nitrate solution; then, carrying out reduction activation treatment on the attapulgite subjected to adsorption; and finally, carrying out chemical silvering on the surface of the attapulgite subjected to reduction activation so as to obtain unidimensional rodlike ultrafine silver powder. The method provided by the invention has the advantages that a metal coating prepared by using the method is small in density, low in cost and complete in metal cladding, and has a rodlike nano structure, thereby creating a new field for the development and application of attapulgite, and improving the economic value added of attapulgite.