Abstract:
Etching islands are formed on a first face of a substrate and a second face of the substrate non-parallel to the first face. The first face and the second face of the substrate are concurrently exposed to a solution that reacts with the etching islands to concurrently form porous regions extending into the first face and the second face.
Abstract:
A method (10) for manufacturing a casted article (62) is presented. The method (10) includes steps of forming a casted article (62) by a liquid metal cooled directional solidification process (12), removing a metallic material (66) from a surface (64) of the casted article (62), (24) and inspecting the surface (64) of the casted article (62), (26). The surface (64) of the casted article (62) is inspected for the presence of the metallic material (66) by exposing the surface (64) to a visualization reagent (110). A system (60) for manufacturing the casted article (62) is also presented.
Abstract:
This disclosure relates to an etching composition containing at least one sulfonic acid, at least one compound containing a halide anion, the halide being chloride or bromide, at least one compound containing a nitrate or nitrosyl ion, and water. The at least one sulfonic acid can be from about 25% by weight to about 95% by weight of the composition. The halide anion can be chloride or bromide, and can be from about 0.01% by weight to about 0.5% by weight of the composition. The nitrate or nitrosyl ion can be from about 0.1% by weight to about 20% by weight of the composition. The water can be at least about 3% by weight of the composition.
Abstract:
The present invention provides a method for treating silicon to form pillars ( see Figure 2), especially for use as the active anode material in Li-ion batteries. The process is simple to operate on a commercial scale since it uses a solution containing only a small number of ingredients whose concentration needs to be controlled and it can be cheaper to operate than previous processes. The etching solution comprises: 0.01 to 5M HF 0.002 to 0.2M of metal ions capable of nucleating on and forming a porous layer comprising regions of elemental metal on the silicon surface; 0.001 to 0.7M of an oxidant selected from the group O 2 , O 3 , H 2 O 2 , the acid, ammonium or alkali metal salt of NO 3 - , S 2 O 8 2- , NO 2 - , B 4 O 7 2- and ClO 4 - a mixture thereof. The treated silicon is suitably removed from the solution. Etched particles or fibres made by the process may be used in the form of a composite material in the active electrode material.
Abstract:
A method for chemically stripping a metallic coating from a substrate (100) is described. The coating is treated in the presence of microwave energy with a solution (120) containing at least one acid known to dissolve the coating. The application of microwave energy accelerates the dissolution and allows for the use of diluted solutions. Coatings of interest include diffusion aluminides on superalloy substrates.
Abstract:
A process for etching a metal such as a cobalt-chromium-molybdenum alloy involves contacting the metal with a solution comprising hydrogen chloride and a persulphate salt; in which the solution has a hydrogen chloride concentration of about 3 to about 11.7 moles/litre and a molar ratio of hydrogen chloride to persulphate salt of about 4:1 to about 134:1, in which the persulphate salt is dissolved in the solution with the use of heat input.
Abstract:
Removal compositions and processes for removing at least one material layer from a rejected microelectronic device structure having same thereon. The removal composition includes hydrofluoric acid. The composition achieves substantial removal of the material(s) to be removed while not damaging the layers to be retained, for reclaiming, reworking, recycling and/or reuse of said structure.
Abstract:
The invention provides an etchant composition employed for selectively etching a metallic material in production of a semiconductor device from an insulating material having high dielectric constant, an insulating material of silicon oxide film or silicon nitride film, and a metallic material, characterized in that the etchant composition is an aqueous solution containing a fluorine compound, and a chelating agent having, in the molecular structure thereof, a phosphorus oxo-acid as a functional group; or is an aqueous solution containing a fluorine compound, a chelating agent having, in the molecular structure thereof, a phosphorus oxo-acid as a functional group, and an inorganic acid and/or an organic acid. The invention also provides a method for producing a semiconductor device employing the etchant composition. According to the invention, a metallic material can be etched selectively and efficiently.
Abstract:
Methods and apparatus for real-time dynamic analysis of a chemical etching process are provided. The apparatus comprises an optical element (36) operative to pass a beam of electromagnetic radiation at least at two points in time through a liquid phase (42) comprising at least one chemical component and including an etchant, wherein the etchant is operative to etch a solid. A detector (60) is operative to perform an ex-situ non-contact scanning detection of the electromagnetic radiation subsequent to passing through the liquid phase in a near infra-red range (700-2500 nm) at the at least at two points in time so as to detect a change in an optical property of at least one of the at least one chemical component and the etchant. The apparatus further comprises a processor (64) operative to activate an algorithm so as to compare the change in the optical property of the at least of the at least one chemical component and the etchant received from the detector so as to provide data concerning a change in concentration of the etchant; and further configured to perform a chemometric manipulation of the data so as to provide a rate of etching of the solid.