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4983250 |
Method of laser patterning an electrical interconnect
Forming an electrical interconnect by applying an adhesion layer over a substrate, applying an electrical conductor layer over the adhesion layer, and applying a reacting layer over the electrical...
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4927492 |
Etching process for zirconium metallic objects
A process is disclosed for determining the dissolved zirconium content of a hydrofluoric acid-nitric acid etching bath for zirconium articles by determining the rise in temperature of a volume of...
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4900398 |
Chemical milling of titanium
Process for chemically milling titanium using an aqueous milling solution consisting essentially of (by weight) about 1% to 5% HF, about 1.5% to 4% chlorate ion and optionally up to about 20% of an...
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4842840 |
Method for production of oxidation-resistant sialon and silicon carbide materials
An oxidation-resistant sialon material and an oxidation-resistant silicon carbide material each containing a phase of closely packed crystals in the surface region are produced by coating a sialon...
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4704188 |
Wet chemical etching of crxsiynz
Thin films of chromium/silicon/nitrogen are etched in a solution of HF, H 2 O 2 , HCl, and H 2 O.
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4685778 |
Process for nuclear hardening optics and product produced thereby
A process for nuclear hardening an optical part consisting of a prepared beryllium substrate processed to yield a surface finish of at least 125 micro-inch rms that is subsequently provided with a...
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4673521 |
Process for regenerating solder stripping solutions
A method for the regeneration of a spent aqueous ammonium bifluoride-hydrogen peroxide solder stripping solution containing contaminant tin ions comprising adding potassium ions to the solution to...
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4613394 |
Staged chemical pipe cutter
Discloses an improved tool and method for cutting material by expelling a jet stream of liquid chemical reactant into forceful flowing connection and chemical reaction with a designated area of the...
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4592854 |
Steel etchant
An etchant composition suitable for use with a wide variety of steel compositions contains between about: TBL ______________________________________ 10-300 ml 75% H 3 PO 4 100-700 ...
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4563239 |
Chemical milling using an inert particulate and moving vessel
Thin edged workpieces are chemically milled to remove material uniformly from their surfaces by tumbling the workpieces in a barrel in which is contained a sufficient volume of inert polymer...
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4548903 |
Method to reveal microstructures in single phase alloys
A method for revealing the microstructure of metal alloys which comprises the steps of polishing the sample, chemically etching the polished metal surface, thermally etching the chemically etched...
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4545918 |
Stabilization of aqueous solutions containing hydrogen peroxide, hydrofluoric acid and metal ions
Process for improving the stability of aqueous solutions containing hydrogen peroxide, metal ions and hydrofluoric acid which can be partially in the form of salts, comprising adding to the said...
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4526650 |
Method for regenerating pickling acids
The residual acid mixture containing metals which has been produced in the steel pickling process is regenerated to become new HF/HNO 3 pickling acid by applying H 2 SO 4 addition and...
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RE31823 |
Chemical milling of high tungsten content superalloys
Chemical milling of cast superalloys having high tungsten contents is advantageously accomplished with an etchant which consists by volume percent of 40-60 concentrated HNO 3 , 0.6-0.8 concentrated...
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4493746 |
Method for reduction of oxides and improving porosity of metalized zirconium oxide ceramics
A method is provided for increasing the porosity of sintered metal coatings on zirconium oxide ceramics comprising the placing of the metallic coated zirconium oxide part in an acid solution,...
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4459216 |
Chemical dissolving solution for metals
An aqueous acidic chemical dissolving solution comprising hydrogen peroxide, an inorganic acid and a specific aromatic compound is applicable to etching, pickling and surface treatment of various...
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4428986 |
Method of preparing a beryllia substrate for subsequent autocatalytic deposition of a metallized film directly thereon
Beryllia is prepared for direct autocatalytic plating of a metal film by immersing it first in a sodium hydroxide solution for roughening the surface uniformly, rinsing it in water, then immersing...
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4410396 |
Metal stripping composition and process
There is disclosed a chemical stripping solution suitable for removing tin and tin-lead alloys from metallized, e.g. copper coated, substrates so as to leave the said substrate reusable comprising...
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4374744 |
Stripping solution for tin or tin alloys
A stripping solution for tin or tin alloys which comprises an inorganic and/or organic acid, an oxidizing agent and a heterocyclic compound free of a sulfur atom but containing a nitrogen atom in...
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4374159 |
Fabrication of film circuits having a thick film crossunder and a thin film capacitor
A method of fabricating film circuits whereby thick film crossunders may be included with thin film capacitors (22) on a single substrate (10). At least one dielectric layer (12) is formed on the...
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4351698 |
Variable sloped etching of thin film heads
A method of fabricating variable sloped, as well as straight, edges on a permalloy body of a thin film head is disclosed. The process comprises forming a titanium layer on the permalloy body...
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4327134 |
Stripping of diffusion treated metals
Chromized nickel- and cobalt-based superalloys have alphachrome phase formed during chromizing, and the amount of that phase is diminished by one or more treatments with alkali-permanganate...
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4318770 |
Surface etching before electroding zirconia exhaust gas oxygen sensors
A method of substantially increasing porosity and surface area on a zirconia body. The zirconia is etched with a mixture of concentrated hydrofluoric acid and concentrated sulfuric acid in a ratio...
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4314876 |
Titanium etching solution
A method of chemically milling metal and particularly for chemically milling titanium and titanium alloys which comprises subjecting these metals to the action of an aqueous acidic medium...
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4306933 |
Tin/tin-lead stripping solutions
An improved tin/tin-lead stripping solution and method of preparing and using same, the solution including one or more compounds containing at least one amino (NH 2 ) group, one carboxylic acid...
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4297257 |
Metal stripping composition and method
A composition for stripping solder and tin from a copper substrate having an extended life is provided by the inclusion of a polyacrylamide in a peroxide-fluoride based stripping composition. The...
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4239586 |
Etching of multiple holes of uniform size
Uniform holes with a diameter of the order of 1 micrometer or larger can be formed by an etching operation which employs the combination properties of the surface tension of the etch coupled with a...
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4239587 |
Method of manufacturing a thin-film magnetic head with a nickel-iron pattern having inclined edges
In the electrodeposition of nickel-iron alloy layers during the manufacture of a thin-film magnetic head it is ensured that the nickel-iron alloy layer has a top layer having a higher iron content...
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4154877 |
Electroless deposition of gold
A method for depositing electroless nickel on aluminum or aluminum alloy is described. The method is particularly useful for fabricating bonding pads on aluminum metallized semiconductor devices...
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4125648 |
Electroless deposition of nickel on aluminum
A method for depositing electroless nickel on aluminum or aluminum alloy is described. The method is particularly useful for fabricating bonding pads on aluminum metallized semiconductor devices...
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4116755 |
Chem-milling of titanium and refractory metals
An improved composition and process for chemically milling titanium, refractory metals, and their alloys, resulting in decreased absorption of hydrogen, thus allowing chemical milling of beta...
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4075040 |
Titanium and titanium alloy surface preparation method for subsequent bonding
The present invention relates to a titanium and titanium alloy surface preparation method, in which the surface to be treated is subjected to a preliminary degreasing and scouring operation and...
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4011150 |
Method of treating refining segments
A method for the treatment of the surface of refining elements or segments is disclosed. The refining segment surfaces, which generally include grooves and ridges, are normally subjected to...
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4004956 |
Selectively stripping tin or tin-lead alloys from copper substrates
Acidic solutions for selectively stripping tin or tin-lead alloys from copper substrates comprising an aqueous solution of at least one nitro-substituted aromatic compound; an inorganic acid...
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4002489 |
Method of pickling metallic material
A method of pickling metallic material particularly for the continuous treatment of material in strip or wire form and especially such material consisting of stainless steel, wherein the material...
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3997411 |
Method for the production of a thin film electric circuit
Method for the production of an electric thin-film circuit having a conductor path and at least one capacitor and/or one resistor, and comprising a substrate base member and the forming of a first...
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3986970 |
Solution for chemical dissolution treatment of tin or alloys thereof
A solution for chemical dissolution treatment (for example, pickling, etching, chemical milling, chemical polishing or leaching) of tin or its alloys which comprises an aqueous solution of an acid,...
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3960741 |
Etchant for removing metals from glass substrates
Disclosed is an etchant for removing a metal, such as titanium, from a glass substrate without adversely attacking the glass. The etchant includes a relatively viscous coating agent that wets and...
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3944496 |
Composition for chemical milling refractory metals
This application describes a composition and a process of chemically milling refractory metals and their alloys. The composition comprises a combination of nitric acid, hydrofluoric acid, and...
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3926699 |
Method of preparing printed circuit boards with terminal tabs
A method for rapidly stripping solder or tin from a substrate, such as copper, without adversely affecting the substrate in the preparation of circuit boards having terminal tabs. The composition...
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3891456 |
Surface treatment of titanium and titanium alloys
A process for treating a titanium or titanium alloy surface to improve its bonding characteristics is provided that comprises directing a stream of a slurry of aluminum oxide grit in a...
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3888778 |
Bright dip composition for tin/lead
A composition for bright dipping tin/lead alloys formed as a coating on substrates of copper so as to avoid tin or lead deposit ion on exposed copper or gold surfaces is provided by an aqueous...
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3887403 |
Process and solution for removing titanium and refractory metals and their alloys from tools
Titanium and refractory metals and their alloys are removed from tools, usually made from steel or carbides, without deleterious effects on the tool, by immersing the coated tool in an acidic...
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3850712 |
METHOD OF ETCHING A TITANIUM OR TITANIUM ALLOY PART
The invention relates to a method of etching a titanium or titanium alloy part in which the part is immersed in a mixture comprising nitric acid, hydrofluorosilicic acid and water.
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3844859 |
TITANIUM CHEMICAL MILLING ETCHANT
A composition and a process for chemical milling titanium utilizing an aqueous nitric-hydrofluoric acid base etchant having a nitric acid content ranging from about 0.2 - 1.2 weight percent.
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3769110 |
DIAPHRAGM FOR LOW-PRESSURE TRANSDUCERS
A method of making a substantially stress-free metal diaphragm for a diaphragm-type low-pressure transducer provides a disk of metal for the diaphragm, which disk has a first diameter, and provides...
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3753815 |
METHOD AND BATH FOR TREATING TITANIUM
Method of treating titanium and titanium alloys, especially hot-worked products such as bar, rod, wire and various flat-rolled forms so as to remove seams, fissures and the like, as well as a...
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3654001 |
PROCESS FOR ETCHING BERYLLIUM
A process for chemical milling of beryllium and high beryllium alloys is described wherein the beryllium is subjected to an aqueous solution of an acid selected from the group consisting of...
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3630796 |
PROCESS FOR FORMING A TITANIUM DIOXIDE FILM
A process for forming a titanium dioxide film which has recently been recognized to be useful for an insulating material for film capacitors and other electric circuit, by feeding a mixed gas of...
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3607475 |
METHOD OF MANUFACTURING ELECTRICAL RESISTANCE ELEMENTS AND ELEMENTS MANUFACTURED BY THE METHOD
An electric resistance element of molybdenum disilicide has a thin incandescent zone whose dimensions are formed by chemical decomposition, dissolution or corrosion.
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