Patent ID: 7073974

Claim:
Apparatus for forming a coherent refractory mass on the surface of a road, the apparatus comprising: a supply of one or more metallic combustible powders, one or more non-combustible ceramic powders and an oxidizer; a combustion chamber operative at or above the melting temperature of the one or more ceramic powders and adapted to be disposed on a surface of a road; a container holding the one or more metallic combustible powders and one or more non-combustible ceramic powders; a first supply line transporting the one or more metallic combustible powders and one or more non-combustible powders and the oxidizer to the combustion chamber; a second supply line supplying air to the combustion chamber to supply additional oxygen, to assist in projecting the refractory mass from the combustion chamber and for cooling the inside of the combustion chamber; and an igniter associated with the combustion chamber and operative to ignite the combustible powder, non-combustible material and oxidizer in the combustion chamber to cause the metallic combustible powder to react in an exothermic manner with the oxidizer and release sufficient heat to form a refractory mass which is projected by flame spraying from the combustion chamber against the surface of the road so that the mass adheres durably to the road surface.