Abstract
Laser beam micro-channel milling (LBMM) is a recently emerged novel micromachining approach, which can be a useful technique for the machining of hard-to-machine advanced engineering ceramics. LBMM provides better competence compared with remaining non-traditional machining processing regarding the material removal rate, better surface characteristics, and ability to cut different nature of materials disregarding of electrical conductivity and hardness. Moreover, micro-channel with high accuracy and precision can be fabricated by this method. This process on zirconia (ZrO 2 ) ceramic materials was investigated in this paper using different parametric combinations. The surface roughness (Ra and Rz) was observed using a precision profilometer. Besides, laser milling operation at defocused condition was performed to reduce the surface irregularities of the machined surface. It was seen that the defocusing condition machining of laser beam results in a low value of surface finish (Rz and Ra) compared to results obtained in focused condition machining of the laser. The optical microscopic view of the machined surface also confirmed the better-machined surface at defocused conditions.
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