When the internal combustion engine is running, piston moves up and down in the cylinder to convert combustion energy to mechanical action. Piston rings seal the combustion chamber and is subject to constant friction during motion. Conventional coating deposited by electroplating cannot meet the friction reduction requirement.
| Coating | i-TAC® |
| Coating Material |
Carbon |
| Coating Technology |
FCVA |
| Substrate |
Steel / Cast Iron |
| Coating Hardness |
1,500HV~3,500HV |
| Coating Thickness |
6~8μm (up to 50 μm) |
| Friction Coefficient |
COF＜0.1 |
| Deposition Temperature |
< 100℃ |
| Coating Color |
Grey |
i-TAC® deposits a thick layer of ta-C (tetrahedral amorphous carbon) coating with hardness up to 3,500HV on the piston ring. It reduces the coefficient of friction to less than 0.1, increases airtightness, improves fuel efficiency, reduces carbon emission, extend piston ring lifespan and reduces maintenance needs.
| Product：Cast-Iron Piston Ring | |||
| Item | Testing Instrument | Reference Range | Test Result |
| Coating Thickness | Metallographic microscope | 6~8μm | 6.5um |
| Brittleness | Rockwell hardness | HF 1~HF 3 | HF 1 |
| Twist Resistant | Inhouse twisting bonding force testing instrument | Coating no peel with 90°twist | Passed |
| Heat resistant | Muffle Furnace | Coating no peel off under 350℃ for 2h | Passed |
| Surface Hardness | Mitutoyo surface roughness measuring instrument | / | Rz=1~2 |
| Micro Hardness | Fisher Micro Hardness Indentation Tester | 1,500~3,500HV | 2,714HV |
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