Apparatus for explosive application of coatings

Abstract

The apparatus comprises an explosion chamber made in the form of a tube closed at one end and accommodating at least one spark plug. The explosion chamber communicates with a chamber for preparation of an explosive mixture and with a batcher metering pulverulent coating material. The batcher includes a mixing chamber communicating with a hopper via a passage. The passage accommodates a device for controlling its cross-sectional area and is provided with a jet nozzle for positively feeding the coating material to the explosion chamber. A partition wall of a gas-permeable material is mounted within the hopper in equally spaced relation to the walls thereof to define an annular space communicating with a compressed gas source prevent self-compaction of the powder. A non-return valve is mounted in the portion of the batcher passage connected to the hopper to close the passage in case of back impact from the explosion chamber. This apparatus provides for more reliable cyclic batching of pulverulent coating material fed to the explosion chamber and is reliably protected against break-through of gas in case of back impacts from the explosion chamber as compared with conventional apparatus of the same type. This considerably improves the quality of coatings, especially when finely comminuted pulverulent coating materials based on refractory compounds are used.