초록 ▼

The high-velocity oxygen-fuel or air-fuel apparatus and method to apply low-oxidized and high-density coatings and bulk materials by spraying of non-fused particles, said apparatus comprises a catalytic member in internal burner. Metallic or ceramic catalyst of the catalytic member allows stable com

The high-velocity oxygen-fuel or air-fuel apparatus and method to apply low-oxidized and high-density coatings and bulk materials by spraying of non-fused particles, said apparatus comprises a catalytic member in internal burner. Metallic or ceramic catalyst of the catalytic member allows stable combustion at gas temperatures below the melting point of spraying material. Lowering of combustion temperature occurs when increasing the pressure and flow rate of the oxidizer or fuel over stoichiometrical or when adding an inert gas into combustible mixture. The catalytic member contains a catalyst selected from the group of noble metals, or binary oxides of the noble metal and rare earth metal, or other high temperature resistant catalyst capable to lower an ignition temperature of the oxidizer and fuel mixture. The catalytic member is made in a form of a wire or wire-net insert, or a coating on walls and passages of the internal burner or a coating on at least one catalyst ceramic support placed in the internal burner.

대표청구항 ▼

[ What we claim as our invention is:] [1.]1. A method of forming a coating or bulk material by depositing a material onto a substrate with high-velocity thermal spray apparatus, said method comprising the mixing of an oxidizer gas and a fuel in a mixing assembly, ignition and combustion of said oxid

[ What we claim as our invention is:] [1.]1. A method of forming a coating or bulk material by depositing a material onto a substrate with high-velocity thermal spray apparatus, said method comprising the mixing of an oxidizer gas and a fuel in a mixing assembly, ignition and combustion of said oxidizer and fuel mixture in an internal burner, forming a high velocity gaseous jet of combustion products of said mixture in a gas expanding nozzle, introduction of selected spraying material into said jet with material delivery unit to form a stream of particles accelerated and heated by said jet below the melting point of said spraying material;wherein said method in addition comprises the use of a catalytic member in said internal burner to lower the combustion temperature of said mixture below the melting point of said spraying material when increasing the pressure and flow rate of said oxidizer or said fuel over stoichiometrical or when adding an inert gas into said mixture.