TY - JOUR
T1 - Ultrasonic vibration-assisted laser engineering net shaping of ZrO2-Al2O3 bulk parts
T2 - Effects on crack suppression, microstructure, and mechanical properties
AU - Hu, Yingbin
AU - Ning, Fuda
AU - Cong, Weilong
AU - Li, Yuanchen
AU - Wang, Xinlin
AU - Wang, Hui
N1 - Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018
Y1 - 2018
N2 - Laser additive manufactured zirconia-alumina ceramic (ZrO2-Al2O3) parts demonstrate severe problems resulting from cracking and inhomogeneous material dispersion. To reduce these problems, we propose a novel ultrasonic vibration-assisted laser engineered net shaping (LENS) process for fabrication of bulk ZrO2-Al2O3 parts. Results showed that the initiation of cracks and the crack propagation were suppressed in the parts fabricated by LENS process with ultrasonic vibration. For the parts fabricated without ultrasonic vibration, the sizes of cracks decreased with the increase of laser power. Scanning electron microscope analyses proved that the introduction of ultrasonic vibration was beneficial for grain refinement and uniform material dispersion. Due to the suppressed cracking, refined grains, and homogenized material dispersion, the parts fabricated with ultrasonic vibration demonstrated better mechanical properties (including higher microhardness, higher wear resistance, and better compressive properties), compared with the parts fabricated without ultrasonic vibration.
AB - Laser additive manufactured zirconia-alumina ceramic (ZrO2-Al2O3) parts demonstrate severe problems resulting from cracking and inhomogeneous material dispersion. To reduce these problems, we propose a novel ultrasonic vibration-assisted laser engineered net shaping (LENS) process for fabrication of bulk ZrO2-Al2O3 parts. Results showed that the initiation of cracks and the crack propagation were suppressed in the parts fabricated by LENS process with ultrasonic vibration. For the parts fabricated without ultrasonic vibration, the sizes of cracks decreased with the increase of laser power. Scanning electron microscope analyses proved that the introduction of ultrasonic vibration was beneficial for grain refinement and uniform material dispersion. Due to the suppressed cracking, refined grains, and homogenized material dispersion, the parts fabricated with ultrasonic vibration demonstrated better mechanical properties (including higher microhardness, higher wear resistance, and better compressive properties), compared with the parts fabricated without ultrasonic vibration.
KW - B. Grain size
KW - C. Mechanical properties
KW - C. Toughness and toughening
KW - D. ZrO-AlO
KW - Laser engineered net shaping
KW - Ultrasonic vibration
UR - http://www.scopus.com/inward/record.url?scp=85035095986&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2017.11.013
DO - 10.1016/j.ceramint.2017.11.013
M3 - Article
AN - SCOPUS:85035095986
VL - 44
SP - 2752
EP - 2760
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 3
ER -