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TABLE 2 CANDIDATE PISTON RING COATING MATERIALS APS = AIR PLASMA SPRAY VPS = VACUUM PLASMA SPRAY

PISTON RING COATING/THICKNESS

1 Plasma Spray

APS Cr203-Si02-Al203 (4 compositions) (100-250 um) VPS B4C (100-250 um) VPS borides (100-250 um) (eg TiB2. SiB6. etc) (4 compositions)

2 High Velocity Thermal Spray

Cr3C2-Ni-Cr (100-250 um) (2 suppliers) 88% WC - 12% Co (100-250 um)

3 Electro-Spark Deposition Cr3C2 - Ni (25-50 um)

4 Diffusion Alloys

Nickel Aluminide (50-100 um) Boride (50-100 um)

5 Physical Vapor Deposition

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