Laser Zone Texturing on Glass And Glass-ceramic Substrates

Laser Zone Texturing on Glass And Glass-ceramic Substrates,10.1109/MRC.1996.658175,David Kuo,Stan D. Veirk,Gary Rauch,Don Polensky

Laser Zone Texturing on Glass And Glass-ceramic Substrates   (Citations: 2)
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Development and implementation of laser zone texture is one of the key advancements in magnetic media technology to meet current and future challenge for ever higher areal density discs, Laser texturing process is clean and low-cost, and requires no expendable, such as abrasives or tapes. More importantly, it offers an unparalleled texturing techmque to create much precise and controllable surface topography, which arc critical to the creation of low glide and low stiction media. One other major advantage of laser texturing is in its ability for precision zone placement. Therefore, surface topography optimization can be achieved in the landing zone and the data zone separately. On NiP/Aluminum substrates, laser zone texturing has been successfully implemented with a pulse Nd-YV04 laser to produce sub 1 p inch glide media [l]. On glass and glass-ceramic substrates, similar laser however can niot be used to create texture since such materials do not absorb radiation energy at wavelengths ranging from 0.35 pm to 5 pm. An IR laser such as CO2 laser on the other hands can generate thermal process on the glass and glass-ceramic substrates which causes the surface temperature to rise beyond the glass reflow temperature and induces bump formation. Use of CO2 laser to create laser bumps on glass-ceramic substrates was first reported by Rauch et al. [2] and Teng et al. [3]. laser to create laser bumps on glass and glass-ceramic substrates. The resulting bump height is found to be a fhnction of laser parameters such as pulse width, spot size, and pulse energy as well as the composition, structure, and chemical strengthening of the substrates. Further analysis reveals that for the same substrates laser bump topography is a fbnction of the melting pool size and is independent of the laser pulse width, which implys that cooling process rather than the heating process is more crucial to the bump formation. Whether the substrate is glass-ceramic, non-strengthened glass, or strengthened glass, the resulting topography of the laser bumps alwayse exhibits net volume gain. Possible mechanisms for the net gain in volume include denisty change from fast quench process of the glass [4] and from phase transition of crystaline phase to the glassy phase [3]. Stress release may play a role in the case of chemically strengthened glass substrates. The tribological performance of laser texture on glass and glassceramic substrates again shows low stiction and friction build-up [ 13. In this work, we also use a COz
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