This invention discloses a
polishing slurry, its preparation method, and its application, relating to the field of
polishing slurry technology. The
polishing slurry of this invention comprises silica
abrasive,
citric acid, and
sodium citrate, with a pH < 7. It effectively controls
metal ion contamination during the polishing process of synthetic
quartz, improves the removal rate during the polishing of
quartz glass substrates, and reduces the
surface roughness of the
quartz. It synergistically optimizes
chemical corrosion and mechanical removal, achieving an atomically smooth, scratch-free, and subsurface-damage-free quartz glass
substrate surface while maintaining a high
material removal rate. Furthermore, it possesses characteristics such as low
contamination, easy cleaning, and environmental friendliness.