After the sample is cooled, remove it from the glass sheet, select a relatively uniform, bubble-free, and no obvious defect coating film, cut out a number of 1×1cm2 square pieces, and put them into a sealed sample bag for later use.
After the sample is cooled, remove it from the glass sheet, select a relatively uniform, no bubble, no obvious defect coating, cut a number of square pieces of 1 × 1cm2, and put them into a sealed sample bag for standby.