TY - JOUR
T1 - Influences of curing depth and layer thickness on forming accuracy and mechanical properties of biphasic calcium phosphate bioceramics fabricated by vat photopolymerization
AU - Dong, Dong
AU - Su, Haijun
AU - Li, Xiang
AU - Jiang, Hao
AU - Shen, Zhonglin
AU - Liu, Yuan
AU - Yu, Minghui
AU - Guo, Yinuo
AU - Yang, Peixin
AU - Zhang, Zhuo
AU - Guo, Min
N1 - Publisher Copyright:
© 2024 The Society of Manufacturing Engineers
PY - 2024/8/30
Y1 - 2024/8/30
N2 - Vat photopolymerization (VPP) is a high potential and efficient method for fabricating advanced ceramics. However, the selection of printing strategy importantly determines the geometrical accuracy and mechanical strength of ceramic parts prepared by VPP. In this study, the effects of the curing depth (Cd) to layer thickness (Lt) ratio and Lt on forming accuracy, microstructures, mechanical properties, surface roughness of biphasic calcium phosphate (BCP) bioceramic green bodies and sintered bodies were investigated. When the Cd/Lt ratio was smaller than 4.0, and the Lt was not over 50 μm, the green bodies presented high forming accuracy (the dimension errors ˂ 3.50 %). Inappropriate Cd/Lt and Lt caused lots of defects including different types of cracks and delamination on green bodies and sintered bodies, and impaired their mechanical strength. The optimal Cd/Lt ratio and Lt were obtained to be 4.0 and 50 μm, in which parameters there were few cracks and delamination on the sintered BCP bioceramics. The flexural strength and the fracture toughness of sintered BCP increased when the Cd/Lt ratio increased from 3.0 to 4.0. However, the flexural strength and the fracture toughness decreased when the Cd/Lt ratio further increased to 5.0. The flexural strength of sintered BCP increased at first and then decreased when the Lt increased from 25 μm to 50 μm, and the fracture toughness and hardness of BCP decreased continually. The flexural strength of sintered BCP showed a maximum value of 113.21 MPa, and the maximum fracture toughness was 0.71 MPa∙m1/2. The elastic modulus and hardness of sintered BCP also reached 24.16 GPa and 3.04 GPa, respectively. The printing surface roughness of BCP bioceramics decreased when the Cd/Lt ratio or Lt increased. The lateral surface roughness decreased with the increase of Cd/Lt ratio, and increased with the increase of Lt. This new result provides a clear printing strategy for fabricating ceramics with high geometrical accuracy and mechanical properties by VPP technique.
AB - Vat photopolymerization (VPP) is a high potential and efficient method for fabricating advanced ceramics. However, the selection of printing strategy importantly determines the geometrical accuracy and mechanical strength of ceramic parts prepared by VPP. In this study, the effects of the curing depth (Cd) to layer thickness (Lt) ratio and Lt on forming accuracy, microstructures, mechanical properties, surface roughness of biphasic calcium phosphate (BCP) bioceramic green bodies and sintered bodies were investigated. When the Cd/Lt ratio was smaller than 4.0, and the Lt was not over 50 μm, the green bodies presented high forming accuracy (the dimension errors ˂ 3.50 %). Inappropriate Cd/Lt and Lt caused lots of defects including different types of cracks and delamination on green bodies and sintered bodies, and impaired their mechanical strength. The optimal Cd/Lt ratio and Lt were obtained to be 4.0 and 50 μm, in which parameters there were few cracks and delamination on the sintered BCP bioceramics. The flexural strength and the fracture toughness of sintered BCP increased when the Cd/Lt ratio increased from 3.0 to 4.0. However, the flexural strength and the fracture toughness decreased when the Cd/Lt ratio further increased to 5.0. The flexural strength of sintered BCP increased at first and then decreased when the Lt increased from 25 μm to 50 μm, and the fracture toughness and hardness of BCP decreased continually. The flexural strength of sintered BCP showed a maximum value of 113.21 MPa, and the maximum fracture toughness was 0.71 MPa∙m1/2. The elastic modulus and hardness of sintered BCP also reached 24.16 GPa and 3.04 GPa, respectively. The printing surface roughness of BCP bioceramics decreased when the Cd/Lt ratio or Lt increased. The lateral surface roughness decreased with the increase of Cd/Lt ratio, and increased with the increase of Lt. This new result provides a clear printing strategy for fabricating ceramics with high geometrical accuracy and mechanical properties by VPP technique.
KW - Biphasic calcium phosphate
KW - Curing depth
KW - Layer thickness
KW - Mechanical properties
KW - Vat photopolymerization
UR - http://www.scopus.com/inward/record.url?scp=85198015964&partnerID=8YFLogxK
U2 - 10.1016/j.jmapro.2024.07.031
DO - 10.1016/j.jmapro.2024.07.031
M3 - 文章
AN - SCOPUS:85198015964
SN - 1526-6125
VL - 124
SP - 1227
EP - 1238
JO - Journal of Manufacturing Processes
JF - Journal of Manufacturing Processes
ER -