Abstract
The core of the production of ultra-precision optical glass-ceramics are the reduction of high-stress concentration and micro-crack growth during polishing. This work aimed to study the effect of gallium solidification in the interfacial micro-structure on the micro-crack growth and the effect of the mechanical properties of glass-ceramics with gallium under different polishing stresses. In this study, a new polishing method was introduced. This innovative technique involves the infiltration of liquid gallium as a filler into the sub-surface of the workpiece. The gallium subsequently solidifies within the micro-cracks of the workpiece, effectively offset surface defects and improving the polishing outcome. The results of the gallium infiltration polishing method show that glass-ceramics workpieces with defects are repaired by solidified gallium, allowing them to be polished at higher pressures, reducing polishing time by 21.4% compared to low-pressure polishing. In addition, the gallium penetration polishing method dispersed the stress concentration near the microcracks and inhibited the growth of micro-cracks during the polishing process, which has been verified by the surface morphology analysis of the workpieces.
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