Abstract: Particles such as magnetic iron oxide capable of being magnetized are crushed to obtain minute magnetic particles each size of which is not larger than 10 .mu.m. The minute magnetic particles are mixed as they are dispersed with such a binding material as cobalt or nickel. Thermal spraying particles each size of which is not smaller than 10 .mu.m are obtained from the mixture. Then, the thermal spraying particles are sprayed upon such a member as a turbine shaft to form a magnetic film on the member with plasma spraying method.

Abstract: A method for providing an electric field having a desirable configuration and strength for the electrostatic coating of phosphors on a fluorescent glass envelope at a controlled temperature comprising enclosing a fluorescent glass envelope with at least one electrically conductive charge retaining member at a desired temperature for the duration of the actual electrostatic coating operation wherein charged phosphor particles are attracted to the interior of the glass envelope and the charge is dissipated to the charge retaining member which remains substantially electrically isolated during the coating process. The process is most suitable adapted to an asymmetric fluorescent glass envelope.

Abstract: In process for forming a coating of phosphor particles on a fluorescent lamp glass, a polymer is deposited on the phosphor particles and the phosphor particles are entrained in a carrier gas with the polymer in a non-adhering state, and then the phosphor particles are coated on the fluorescent lamp glass with the polymer in an adhering state for retaining the phosphor particles on the fluorescent glass and, the coated fluorescent glass is heated to a temperature above the decomposition temperature of the polymer for removing the polymer and to form a coating of phosphor particles on a fluorescent lamp glass.

Abstract: An apparatus and method for coating surfaces of workpieces employs an electrostatic fluidized bed unit for producing a cloud of charged particles, for deposition upon the workpiece, and a second fluidized bed for agitating the particulate material and for facilitating feeding thereof to the electrostatic coating bed, the second bed being disposed beneath the first bed, and being in powder flow communication with it.

Abstract: A method and apparatus for spraying a solid particulate powder onto the interior surface of tubular articles by intermittently pumping the powder from a fluidized bed of powder through a powder supply line containing an intermittently operated venturi pump and air amplifier, as well as a pair of constantly operated air diffusers and an electrostatic charging apparatus. A powder collection shroud adjacent at least one open end of the tubular article has a carefully regulated vacuum applied thereto in order to collect oversprayed powders.