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Formation Mechanism of Gradient Wettability of Si 3 N 4 Ceramic Surface Induced Using a Femtosecond Laser
Author(s) -
Yang Qibiao,
Lv Zhihuai,
Wu Tianyu,
Chen Yang,
Ren Xiaoping,
Cheng Jian,
Lou Deyuan,
Chen Lie,
Zheng Zhong,
Rui Quan,
Liu Dun
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000105
Subject(s) - wetting , contact angle , materials science , x ray photoelectron spectroscopy , femtosecond , laser , ceramic , laser power scaling , scanning electron microscope , optics , composite material , analytical chemistry (journal) , chemistry , chemical engineering , physics , engineering , chromatography
The gradient wettability surface is processed on the surface of Si 3 N 4 ceramics using a 1030 nm femtosecond laser. Both the microdimple morphology, surface contact angle, and surface chemical structure are determined using optical microscopy, optical profilometry, contact angle measuring instrument, and X‐ray photoelectron spectroscopy (XPS). The effects of average laser power, scanning passes, and microdimple distribution density on both surface morphology and contact angle are also studied. Accordingly, the wettability surfaces of different gradients are processed by changing the microdimple distribution density, and the flow state of the cutting fluid on the gradient wettability surface is observed using a high‐speed camera. The results show that both the diameter and depth of the microdimple increase with the increase in the average laser power and scanning passes. As the average laser power increases, the surface contact angle gradually reduces and then increases. Moreover, because of the increase in scanning passes, the surface contact angle gradually decreases. The microdimple morphology is an important factor affecting the wettability of the sample surface. Reason construction of the surface microdimple distribution density can obtain different gradients of wettability surface. Furthermore, with a larger gradient, the wetting rate of the cutting fluid will be faster.