Abstract:
A coating applicator element for use in a thermal spray coating process is described. The element comprises a coating powder and a non-gaseous propellant, and optionally a plasma generating device. There is also described an apparatus for thermal spray coating a target which apparatus comprises a barrel, an ignition assembly, storage and feeding means for the coating applicator elements, and means for connection to a power supply.
Abstract:
Eine Flammspritzvorrichtung (10), insbesondere eine Hochgeschwindigkeits-Flammspritzpistole, für das thermische Spritzen metallischer und nichtmetallischer Spritzwerkstoffe in Pulver- oder Drahtform mittels in einer Brennkammer erzeugter und in einem Einschnürrohr beschleunigter Flamme aus einem flüssigen oder gasförmigen Brennstoff sowie einem Oxidationsgas, weist ein zumindest drei Teile umfassendes wassergekühltes Brennersystem mit Brennkammer (26), Einschnürrohr (34) und einem Flammeneinschnürkanal (32) auf. Das Einschnürrohr (34) ist auswechselbar angebracht und wenigstens einer von einem Kraftspeicher (42,66), druckbeaufschlagten Dichtung (40,40a) zugeordnet. Dieser Dichtung für das eingesteckte Einschnürrohr (34) ist wenigstens eine helicoidale oder aber zumindest eine Blattfeder (42,66) als Kraftspeicher zugeordnet.
Abstract:
A flame coating machine for coating field joints of a pipeline has a flame spray system having two flame spray units configured for heating and/or coating with a thermoplastic polymer an annular junction portion and two annular end portions of an existing coating delimiting the annular junction portion; a control system having two temperature sensors configured for acquiring temperature values along the surface collectively defined by the annular junction portion and the annular end portions, and a control unit configured for actuating the flame spray unit in a polymer flame spraying mode or in a flame heating mode as a function of the detected temperature values and at least one threshold value.
Abstract:
Disclosed is a surface treatment device with a robust nozzle configuration. The device includes a nozzle for ejecting a primary stream of combustible substance to a gaseous atmosphere in an ejection direction; an ignition unit configured to ignite the primary stream in a point of ignition; and an impermeable shield providing a planar surface that is substantially opposite to the ejection direction and has in front of the nozzle a hole that allows passage of the primary stream. The shield is positioned between the nozzle and the point of ignition of the primary stream. The shield is advantageously dimensioned to allow simultaneous passage of the primary stream ejected from the nozzle and a circumferential secondary stream of gas from the gaseous atmosphere via the hole.
Abstract:
A method and a liquid feeding device for feeding liquid in a flame spraying apparatus that is arranged for treating an optical fiber structure, as well as a flame spraying apparatus in which liquid feeding is arranged according to the invention. Liquid is supplied to an unpressurized space in a pressure generating part substantially in a constant flow. In the pressure generating part the pressure of liquid is generated by means of gravity influencing the liquid, and the pressurized liquid is arranged to be supplied to the flame spraying at a substantially constant pressure and at a constant flow rate.
Abstract:
An apparatus and method for manufacturing ultra-fine particles using an electrospray device is disclosed. One or more capillary provided at its tip with a nozzle is positioned within a guide duct and precursors such as metal organic materials and metal halogen compounds, or nonvolatile substances or volatile substances are supplied to the capillary. Voltages are applied to the capillary and the guide duct, respectively, so that a voltage difference is generated therebetween and the highly charged liquid droplets from the capillary are sprayed. The sprayed liquid droplets are carried along the guide duct together with carrier gas injected into the guide duct. When heat energy is applied to the liquid droplets, chemical reactions of the liquid droplets occur. A collecting plate positioned in front of the guide duct collects ultra-fine particles formed by the chemical reactions.
Abstract:
A method and a liquid feeding device for feeding liquid in a flame spraying apparatus that is arranged for treating an optical fiber structure, as well as a flame spraying apparatus in which liquid feeding is arranged according to the invention. Liquid is supplied to an unpressurized space in a pressure generating part substantially in a constant flow. In the pressure generating part the pressure of liquid is generated by means of gravity influencing the liquid, and the pressurized liquid is arranged to be supplied to the flame spraying at a substantially constant pressure and at a constant flow rate.
Abstract:
The present invention provides a spray gun with associated nozzle attachments for high deposition efficiency for thermal spray of high quality, dense, low oxide content coatings. The spray guns are used to produce coatings using a thermal spray process, a high velocity oxy-fuel process, a high velocity air-fuel process, cold spraying, and plasma spraying in which the process is characterized by having an over-expanded flow with a Mach number from about 1.0 to about 4.0 which have passageway section which diverges to the gun outlet. In one embodiment the nozzle attachment is another diverging section with a greater angle of divergence than the diverging nozzle section. In another embodiment the nozzle attachment includes the aforementioned diverging nozzle attachment section followed by a converging nozzle section having an outlet section through which the thermal spray is emitted.
Abstract:
Systems and methods for applying a coating to an interior surface of a conduit. In one embodiment, a spray gun configured to apply a coating is attached to an extension arm which may be inserted into the bore of a pipe. The spray gun may be a thermal spray gun adapted to apply a powder coating. An evacuation system may be used to provide a volume area of reduced air pressure for drawing overspray out of the pipe interior during coating. The extension arm as well as the spray gun may be cooled to maintain a consistent temperature in the system, allowing for more consistent coating.