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SAPS Service Thermal Spray Treatment Supersonic Plasma Spraying Metal Surface Coating Spray Process. Ultra-high jet temperature, suitable for high-melting-point ceramics like alumina and zirconia. Supersonic particle velocity, lower porosity and denser coating than conventional APS. Higher bonding strength, coating resists peeling and spalling better. Capable of multi-functional coatings: thermal barrier, insulation, wear & corrosion resistance. Controllable heat input to substrate.