Table 1.
Surface roughness parameters for NiTi alloys in the initial state for ground and polished surfaces and with TiO2 surface layers: at 290 °C on ground surface, at 290 °C on polished surface, at 190 °C on ground surface, and at 390 °C on ground surface, as measured by optical profilometer.
| NiTi (Ground Surface) | NiTi (Polished Surface) | NiTi + TiO2 (290 °C, Ground Surface) | NiTi + TiO2 (290 °C, Polished Surface) | NiTi + TiO2 (190 °C, Ground Surface) | NiTi + TiO2 (390 °C, Ground Surface) | |
|---|---|---|---|---|---|---|
| Ra [nm] | 197.1 ± 6.6 | 20.5 ± 4.3 | 170.0 ± 6.3 | 30.1 ± 1.9 | 145.4 ± 2.3 | 172.9 ± 5.8 |
| Rq [nm] | 254.8 ± 9.9 | 25.9 ± 5.1 | 221.9 ± 6.7 | 39.7 ± 2.3 | 192.9 ± 2.5 | 223.3 ± 7.8 |
| Rz [nm] | 2567.1 ± 294.5 | 336.2 ± 58.4 | 2301.6 ± 67.3 | 690.4 ± 53.6 | 2222.0 ± 54.3 | 2596.7 ± 137.5 |
| Rt [nm] | 3279.4 ± 664.5 | 580.6 ± 180.0 | 2829.5 ± 224.6 | 954.5 ± 140.4 | 2650.1 ± 248.5 | 3647.5 ± 478.9 |
Ra—arithmetic average of absolute values of profile heights over evaluated length; Rq—root mean square average of the profile heights over evaluated length; Rz—the absolute vertical distance between the maximum profile peak height and the maximum profile valley depth along the sampling length; Rt—total height of the roughness profile: difference between height of the highest peak and depth of the deepest valley along the sampling length