Dependence of friction durability of lubricant-coated magnetic disk on surface temperature

The tribological properties of magnetic disks coated with two different lubricants, Ztetraol and A20H-DD, at high temperatures were evaluated by performing a lateral vibration friction wear test, LM-FFM (lateral modulation friction force microscopy), SPM (Scanning probe microscope) in a controlled environment, and a load increase/decreases reciprocating friction test after heating the disks using near-infrared irradiation equipment. In the case of the Ztetraol-coated magnetic disk, considerable wear was produced in the lateral vibration friction wear test at 300°C in vacuum. In contrast, there was little wear on the A20H-DD-coated magnetic disk. The tribological properties of the Ztetraol-coated magnetic disk evaluated by the load increase/decreases friction test show that the wear resistance is higher at 200t, and lower at 250°C than that at room temperature. On the other hand, the durability of the A20H-DD-coated magnetic disk was greater at 250°C and lower at 350°C than that at room temperature. The bonding layers of lubricant formed upon heating at a suitable temperature increase the durability. In contrast, upon heating at a higher temperature the free lubricant is solidified and can be removed by tip of SPM sliding. A20H-DD has excellent durability at high temperatures.