BigPatents India

This invention relates to a process of producing a wear corrosion and water droplet resistant coating of metallic carbides and metals as herein defined, comprising the steps of: - feeding a carbide/metallic powder in a high-velocity, oxy-fuel spraying chamber and accelerating to velocity more than sonic velocity; - detachably attaching a plurality of multipoint fuel injector to said spraying chamber for injection liquid fuel into spraying chamber; - gradual stepping up of a flame temperature in said spraying chamber through injecting of liquid fuel; - supplying a compressed oxygen to said chamber to produce a high spraying velocity; - feeding said carbide/metallic powder into said high temperature flame for melting and acceleration to a high velocity of 700-800 m/sec or more before being deposited into said component. This invention also relates to an injector to carry out the method of producing wear resistant and water droplet resistant coating comprising a HVOF fuel injector provided with a plurality of precise drilled holes for injecting oxygen, corresponding holes for injecting liquid into the stream of oxygen for automization and a separate hole for injecting hydrogen for ignition.