Physical model showing the interaction of laser beam with porous ceramic substrate during the laser surface modification. Various effects such as surface melting, evaporation, generation of evaporation recoil pressure, and melt infiltration are shown.
Schematic of an integrative modeling method for predicting the overall depth of melting in laser surface modified alumina ceramic.
Typical polished cross section of laser surface modified alumina ceramic mounted in epoxy mould. Surface modification was carried out at a laser fluence of .
Computed temporal evolution of surface temperature during laser surface modifications of alumina ceramic processed with a range of laser fluence from .
Computed variation of maximum surface temperature with laser processing fluence during the surface modifications of alumina ceramic.
Computed temperature distribution below the surface of alumina ceramic surface modified with a range of laser processing fluence from .
Computed temporal evolution of evaporation-induced recoil pressure during the laser surface modification of alumina ceramic processed with a laser processing fluence of .
Computed evaporation-induced recoil pressure as a function of laser processing fluence employed during the laser surface modifications of alumina ceramic.
High magnification SEM micrograph of the interfacial region of the laser surface modified alumina illustrating the infiltration of molten material into the underlying porous material assisted by evaporation-induced recoil pressures.
Comparison of computed depth of melting from thermal and fluid flow model with experimental depth of melting (◆, Experimental; ∎, thermal model; and ▴, integrative thermal and fluid flow model).
Properties of alumina used in mathematical calculations.
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