Thermal spray apparatus and method

Details Thermal spray apparatus and method Thermal spray apparatus and method

1979-02-22

1980-11-25

Pianalto, Bernard D.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427191, 427192, B05D 100, B05D 108

Patent

active

042359430

ABSTRACT:
A thermal spray method capable of directing plasticized powders against a substrate for deposition of a protective coating thereon is disclosed. Various structural details of the apparatus described enable the attainment of high particle velocities without melting the particles. The method is built around the concept of reducing the temperature of a hot plasma stream after the hot plasma stream is generated. Coating particles are injected into the hot plasma stream only after the medium is cooled. In detailed embodiments, a generated plasma is cooled by the addition of a diluent gas or by passing the generated plasma through an elongated heat exchanger upstream of the point at which the powders are to be injected. The plasma is accelerated after the plasma is cooled to recover velocity lost in the cooling step.

REFERENCES:
patent: 3145287 (1964-08-01), Siebein et al.
patent: 4146654 (1979-03-01), Guyonnet

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