摘要:
The present invention relates to a method and a system for treating a surface of an object obtained by direct metal laser sintering. The object is sintered from a metal powder with a grain size distribution. Due to the manufacturing process, the object can comprise a rough surface with remaining grains of the metal powder attached to the surface. The method according to the present invention provides parameters for post-processing the object to achieve a smooth surface suitable for use in medical imaging systems.
摘要:
The present invention relates to an electrolyte for electropolishing metal surfaces, in particular workpieces, in particular made of titanium or titanium alloys such as nitinol. The present invention furthermore relates to a method for electropolishing, using the electrolyte.
摘要:
Die Erfindung betrifft ein Verfahren zum elektrochemischen Polieren von metallischen Oberflächen mittels sich wiederholenden Pulssequenzen, wobei zumindest ein anodischer Puls vorgesehen ist, dessen Stromstärke im zeitlichen Verlauf einen stetigen Anstieg bis zu einem vorgebbaren Wert aufweist, dessen Verwendung für 3D-gefertigte Bauteile sowie eine Anlage hierzu.
摘要:
A method of removing hydrogen from the surface of a non-ferrous metal workpiece, including exposing the surface to a bath of an aqueous electrolyte solution including a concentration of citric acid from about 1.665 g/L to about 982 g/L and a concentration of ammonium bifluoride less than or equal to about 360 g/L, and being substantially free of a strong acid; controlling the temperature of the bath to be about -2 °C to about 90 °C; connecting the workpiece to the anode of a DC power supply and immersing a cathode of the DC power supply in the bath; and applying a current across the bath at a voltage and a current density measured as current per surface area of the workpiece.
摘要:
A method of manufacturing an article, comprising taking an article formed in an initial state via an additive manufacturing process and performing a second manufacturing process to transform the article into a second state, which comprises mounting the article in a holding device, processing at least one first feature on the article, which comprises processing at least one set of mounting features on the article, re-mounting the article via the at least one set of mounting features, and then processing at least one second feature on the article.
摘要:
The invention relates to electrolytes for electrochemically polishing workpieces consisting of titanium, titanium alloys, niobium, niobium alloys, and tantalum and tantalum alloys, and containing sulphuric acid, ammonium bifluoride and at least one hydroxycarboxylic acid. The invention also relates to a method for electrochemical polishing.
摘要:
The invention concerns a bath composition for electropolishing of a non-alloyed titanium metal surface, characterised in that it comprises: sulphuric acid (95 to 98 % solution): 20 to 40 % in volume; hydrofluoric acid (40 to 48 % solution): 10 to 18 % in volume; acetic acid ( 90 to 100 % solution): 42 to 62 % in volume, capable of modifying the electrochemical balances at the solution-metal interface, the acetic acid enabling a better control of oxidation and dissolution of the titanium surface and to automatically limit the chemical dissolution of the metal surface.
摘要:
A method of performing hybrid electrochemical and abrasive fluid polishing is provided. The method comprised disposing (202) a workpiece to be polished and a cathode in a flow of polishing fluid, wherein the polishing fluid comprises at least one electrolyte and at least one abrasive medium. The method further comprises connecting (204) the workpiece and the cathode to an electrical power supply. An apparatus (100) is also provided for hybrid electrochemical and abrasive fluid polishing. The apparatus comprises a vessel (102) comprising an inlet (103a) and an outlet (103b) to allow a flow of fluid through the vessel. The apparatus further comprises one or more mounts (104) configured to hold a workpiece (108) to be polished in the vessel between the inlet and the outlet. The apparatus also comprises one or more connectors (106) configured to connect the workpiece and a cathode (110) to an electrical power supply.
摘要:
A low-hazardous electropolishing process has been developed to remove oxide layer(s) from the surface of nitinol needles. Low concentrations of citric acid and sulfamic acid are mixed with medium concentrations of sulfuric acid to use as an electrolyte solution. The process can be easily fitted into current suture needle manufacturing processes as well as into processes require electropolishing of nitinol-containing medical devices.
摘要:
The present invention relates to durable, surface modified article used as medical device obtained by anodic oxidation and more particularly to a novel nanophase structure on the surface of said article and a method for producing the same.