Betekenis van:
ground wave

Voorbeeldzinnen

1. "Laser" Vaporization uses either pulsed or continuous wave "laser" beams to vaporize the material which forms the coating; 4. Cathodic Arc Deposition employs a consumable cathode of the material which forms the coating and has an arc discharge established on the surface by a momentary contact of a ground trigger. Controlled motion of arcing erodes the cathode surface creating a highly ionized plasma. The anode can be either a cone attached to the periphery of the cathode, through an insulator, or the chamber. Substrate biasing is used for non line-of-sight deposition. N.B. This definition does not include random cathodic arc deposition with non-biased substrates. 5. Ion Plating is a special modification of a general TE-PVD process in which a plasma or an ion source is used to ionize the species to be deposited, and a negative bias is applied to the substrate in order to facilitate the extraction of the species from the plasma. The introduction of reactive species, evaporation of solids within the process chamber, and the use of monitors to provide in-process measurement of optical characteristics and thicknesses of coatings are ordinary modifications of the process. c. Pack Cementation is a surface modification coating or overlay coating process wherein a substrate is immersed in a powder mixture (a pack), that consists of: 1. The metallic powders that are to be deposited (usually aluminium, chromium, silicon or combinations thereof); 2. An activator (normally a halide salt); and 3. An inert powder, most frequently alumina.