Low Wear of Magnetic Disk Slid with Diamond Slider.

Abstract

Tribological properties of magnetic disk with diamond and Al2O3 TiC sliders were studied by disk contact sliding tester and reciprocating tribo tester, and then the contact principal and shearing stress were analyzed by the boundary element method. The following results were obtained. (1) Friction coefficient of magnetic disk with diamond tip lubricanted with PFPE is low asμ=0.1-0.8 evaluated with magnetic disk contact sliding tester. In contrast, the friction coefficient of magnetic disk slid with Al2O3 TiC slider is as high asμ=0.5-1.4. This result is mainly deduced to the low shear strength of PFPE lubricant between diamond slider and magnetic disk surfaces. (2) Wear rate of magnetic disk slid with Al2O3 TiC slider is larger than that with diamond slider. Plastic deformation damage were formed on the magnetic disk surface with PFPE boundary-lubrication. When a diamond is used as opposite sliders, wear on the magnetic disk surface can be reduced. (3) To clarify the reason why less wear of magnetic disk with diamond slider, stress analysis was carried out by the boundary element method about each sliding combination. The maximum shear stress of magnetic disk surface slid with diamond slider is less than that of the magnetic disk Al2O3 TiC combination. The wear rate of the magnetic disk slid with diamond tip is very little due to the low shearing stress of surface because of the damage seems to be originated from sliding surface. (4) Wear rate of magnetic disk corresponds to the maximum shearing stress on surface. To realize accerarated wear test of magnetic disk contact sliding test with the analysis of maximum shearing stress of surface, the running in effect must be evaluated.