摘要:
Energy, such as from a UV excimer laser (712), an infrared Nd:YAG laser (714) and an infrared CO2 laser (716) is directed through a nozzle (722) at the surface of a substrate (702) to mobilize and vaporize a carbon constituent (e.g., carbide) within the substrate (e.g., steel). An additional secondary source (e.g., a carbon-containing gas, such as CO2) (720) and an inert shielding gas (e.g., N2) are also delivered through the nozzle. The vaporized constituent element is reacted by the energy to alter its physical structure (e.g., from carbon to diamond) to that of a composite material which is diffused back into the substrate as a composite material.
摘要:
A method for providing a glassy carbon coating to a substrate for producing a protected substrate is disclosed. The glassy carbon coating may formed through use of a plasma gas gun delivering a plasma to a substrate. In the plasma gas embodiment, powdered carbon or an alternative polymerizable material is introduced into the ionized gas stream for application to a substrate. According to an alternate embodiment of the present invention, the substrate is dipped and coated with a polymerizable material and the coated substrate is exposed to a heat source such as one or more lasers, thus transforming the coating into a glassy carbon coat. The coat produced through any application method of the present invention provides a barrier to corrosion, erosion, wear and high heat. A substrate so coated may be exposed to extreme environments, high heat, low heat, wet, dry, or surface contacting without showing any significant degradation.
摘要:
Energy, such as from three different lasers, is directed at the surface of a substrate to mobilize and vaporize a carbon constituent element (e.g., carbide) within the substrate (e.g., steel). The vaporized constituent element is reacted by the energy to alter its physical structure (e.g., from carbon to diamond) to that of a composite material which is diffused back into the substrate as a composite material. An additional secondary element, which also contains carbon, may optionally be directed (e.g., sprayed) onto the substrate to augment, enhance and/or modify the formation of the composite material, as well as to supply sufficient or additional material for fabricating a diamond or diamond-like coating on the surface of the substrate. The process can be carried out in an ambient environment (e.g., without a vacuum), and without pre-heating or post-cooling of the substrate.
摘要:
Nanoscale particles and powders (108) are made from a starting material, including larger-size starting particles and solid targets (106). Various techniques are disclosed all of which generally involve heating and decomposing the starting material with an energy source (102) selected from the group consisting of laser, electric arc, flame and plasma. In certain of the embodiments, cooling is required to prevent agglomeration of the nanoscale particles into larger particles. Methods of using the particles as a joining material are disclosed, including methods of brazing a vane to the bowl and/or shroud of an automatic transmission bowl assembly.