It is new thermal spray method forming extremely elaborate high density of thin film as it softens and accelerates thermal spray material due to maximum collision kinetic energy by using heat and acceleration energy of hypersonic Jet flow (velocity: 2100m/sec. or more) that is discharged in condition of high pressure (combustion pressure: 13 Bar) from Rocket combustion room. Rocket thermal spray is a new thermal spray method for forming extremely elaborate high density thin films by using heat generated by collision at supersonic jet flow(velocity: 2100m/sec or more) to melt thermal spray precursor and discharged at high pressure (combustion pressure: 13 Bar) from rocket combustion room

Rocket thermal spray can be used for low melting point precursors, metallic carbide, that is cemented carbide (WC), and boron-metal compound etc. And since flying speed of thermal spray material (velocity: 900m/sec. or more) is extremely fast, physical property change of substrate (oxide formation) is rare; and it may gain cemented carbide film (WC: DPH300 1400) and strong and elaborate high-density (porosity: 0.5% or less) coating