On May 11, 2026, PVD technology professionals released an analysis on the abnormal increase in coating surface roughness. In practical production, the coating Ra value often surges from 0.1μm to 0.5μm, with obvious sand-like appearance, seriously impairing product quality. Experts state that such abnormality stems from multiple factors. Bias voltage has a U-shaped effect, with low voltage causing columnar crystals and high voltage leading to etching. Excessive arc current generates large droplets. Dust, unbalanced reaction gas, temperature fluctuation and improper furnace loading also contribute. Systematic diagnosis via morphology observation, process curve checking and chamber inspection is recommended. Single-variable verification helps locate root causes accurately, ensuring process stability and product quality. For more information, please visit: https://www.tiktok.com/@mia_iota/video/7597717976720149782