Abstract:
The invention relates to a wear-resistant roller (1) for crushing of particulate material, such as crude ore for use in the cement or minerals industry comprising a roller body (2), a wear surface (3) on the roller body (2). The wear surface (3) comprises welding beads (4) comprising a primary fraction of carbide material and a secondary fraction of material selected from the group consisting of Nickel, Nickel alloys, mixtures of Nickel and Nickel alloys and mixtures of Nickel containing refractory hard materials, Cobalt, Cobalt alloys, mixtures of Cobalt and Cobalt alloys and mixtures of Cobalt containing refractory hard materials. Furthermore, the welding beads (4) are welded to the roller body (2) in an overlapping manner such that two neighbouring welding beads (4) comprise an overlapping volume (5) and a non-overlapping volume (6), the overlapping volume (5) being an intersection volume between the two neighbouring overlapping welding beads (4), and the fraction of carbide material being higher in the overlapping volume (5) than in the non-overlapping volume (6) such that the overlapping volume (5) has a higher wear resistance compared to the non-overlapping volume (6) having a lower wear-resistance. Also the invention relates to a method of forming such a wear surface on a roller body (2).
Abstract:
A welding assembly including a current generator, a first electrode electrically coupled to the current generator, the first electrode including a first engagement surface, a second electrode electrically coupled to the current generator, the second electrode including a second engagement surface, a width-determining fixture positioned between the first electrode and the second electrode to define a welding volume having a width, and an electrically nonconductive material positioned to electrically insulate at least one of the first electrode and the second electrode from an electrical conductor outside the width.
Abstract:
A method for forming an implantable electrode (100) includes exposing a conductive surface of the electrode (100) with a first application of an excimer laser (215) and creating a first surface texture on a conductive surface with a second application of the excimer laser. In one example, a low impedance implantable electrode includes a conductive surface and a coating disposed over the conductive surface. The coating may have a lower contact impedance with biological tissue than the conductive surface. At least a portion of the coating has an excimer laser textured surface.
Abstract:
A method of removing a coating of a substrate comprises a series of steps. A substrate is provided, the substrate including a feature on a surface of the substrate. The surface of the feature has a coating. The surface of the substrate is imaged to provide information about the feature. A portion of the coating is removed by a laser source. The surface of the substrate is imaged to provide information about a coating thickness of the coating of the surface of the feature. A boundary is calculated between a first area including the coating and a second area with the coating substantially removed. A portion of the coating in the first area within the boundary is removed using a laser source.
Abstract:
A method of forming patterns in coatings on opposite sides of a transparent substrate by direct write laser patterning comprising the steps: a) providing a first transparent coating on a first side of the substrate, the first coating being formed of a material having a relatively high laser ablation threshold energy density; b) mounting the substrate on a stage or locating the substrate on a chuck, c) using a first laser beam to form a first pattern in the first transparent coating by laser ablation; d) providing a second transparent coating on the second side of the substrate after formation of said first pattern, the second coating being formed of a material having a relatively low laser ablation or modification threshold energy density; using a second laser beam to form a second pattern in the second transparent coating by laser ablation or modification, the energy density of the second laser beam being lower than that of the first laser beam such that ablation of the second transparent coating is carried out without causing appreciable damage to the first transparent coating. Apparatus arranged to carry out this method and a product formed by the method are also described.
Abstract:
Converter device for converting energy from electromagnetic radiation, in particular concentrated solar energy, in electrical power, comprising a thermionic emitter (2) and an absorber (1) of electromagnetic radiation, configured to transform electromagnetic radiation energy to thermal energy, having an outer surface (10) configured to be exposed to electromagnetic radiation and an inner surface integrally coupled to the thermionic emitter (2), the outer surface (10) being provided with a sub-micrometer periodic surface structure, the thermionic emitter (2) being monolithically integrated on said inner surface of the absorber (1), the absorber (1) being made of a material selected from the group comprising or consisting of carbide or aluminium nitride-based ceramic materials, and pyrolitic graphite, the thermionic emitter (2) being made of a material selected from the group comprising or consisting of thin film diamond deposited through chemical vapour deposition (CVD), thin film titanium nitride (TiN) or molybdenum silicide or di carbides or di borides-based ceramic materials, and refractory metals.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Aluminiumkolbens (1) für einen Verbrennungsmotor, der zumindest im Bereich eines Muldenrandes (4) und/oder eines Muldengrunds (3) zum Einbringen zumindest eines Zusatzelements in einen Grundwerkstoff des Aluminiumkolbens (1) und zur Erzeugung intermetallischer Phasen(6) einer Schweißbehandlung unterzogen wird. Erfindungswesentlich ist dabei, dass mittels dem Schweißverfahren zumindest eines der folgenden Zusatzelemente in der angegebenen Konzentration eingebracht wird, 1 -7 Gew.-% Ni, 1 -15 Gew.-% Cu und 0,5 -5 Gew.-% Fe. Hierdurch lassen sich besonders fein und vorteilhaft ausgebildete intermetallische Phasen (6) erzeugen, die zur Erhöhung der thermomechanischen Beständigkeit des Aluminiumkolbens (1) beitragen.
Abstract:
Systems and methods for laser scribing provide extended depth affectation into a substrate or workpiece by focusing a laser beam such that the beam passes into the workpiece using a waveguide, self-focusing effect to cause internal crystal damage along a channel extending into the workpiece. Different optical effects may be used to facilitate the waveguide, self-focusing effect, such as multi-photon absorption in the material of the workpiece, transparency of the material of the workpiece, and aberrations of the focused laser. The laser beam may have a wavelength, pulse duration, and pulse energy, for example, to provide transmission through the material and multi-photon absorption in the material. An aberrated, focused laser beam may also be used to provide a longitudinal spherical aberration range sufficient to extend the effective depth of field (DOF) into the workpiece.
Abstract:
Zum Abtragen von Material (2) von einem Formkörper (1) aus einem SiO 2 -basierten Material (2) mit intensivem Lichtwird, bevor das intensive Licht auf eine Oberfläche (3) des Formkörpers (1) gerichtet wird, die Absorption des intensiven Lichts durch das Material (2) an der Oberfläche (3) erhöht, indem atomarer Wasserstoff in die Oberfläche eingebracht wird.
Abstract:
Bei einem Verfahren zum Laserschneiden eines mit einer Folie (3) oder einer Beschichtung versehenen Werkstücks (4) mittels eines Schneidlaserstrahls (13) mit einer Laserwellenlänge (λ) kleiner ca. 4 μm, insbesondere im Bereich von ca. 1 μm, wird erfindungsgemäß ein erster Laserstrahl (8) in einen ersten Faserkern (11) einer Doppelkernfaser (10) eingekoppelt und aus dem ersten Faserkern (11) als Schneidlaserstrahl (13) zum Schneiden des Werkstücks (4) ausgekoppelt, und ein zweiter Laserstrahl (9) wird in einen zweiten Faserkern (12) der Doppelkernfaser (10) eingekoppelt und aus dem zweiten Faserkern (12) als ein auf dem Werkstück (4) dem Schneidlaserstrahl (13) zumindest teilweise in Schneidrichtung (16) voreilender Verdampfungslaserstrahl (14) zum Verdampfen der Folie (3) oder der Beschichtung ausgekoppelt.