Author:
Nie Guanglin,Li Yehua,Sheng Pengfei,Zuo Fei,Wu Haolin,Liu Leiren,Deng Xin,Bao Yiwang,Wu Shanghua
Abstract
AbstractIn this study, the chemical precipitation coating (CP) process was creatively integrated with DLP-stereolithography based 3D printing for refining and homogenizing the microstructure of 3D printed Al2O3 ceramic. Based on this novel approach, Al2O3 powder was coated with a homogeneous layer of amorphous Y2O3, with the coated Al2O3 powder found to make the microstructure of 3D printed Al2O3 ceramic more uniform and refined, as compared with the conventional mechanical mixing (MM) of Al2O3 and Y2O3 powders. The grain size of Al2O3 in Sample CP is 64.44% and 51.43% lower than those in the monolithic Al2O3 ceramic and Sample MM, respectively. Sample CP has the highest flexural strength of 455.37±32.17 MPa, which is 14.85% and 25.45% higher than those of Samples MM and AL, respectively; also Sample CP has the highest Weibull modulus of 16.88 among the three kinds of samples. Moreover, the fine grained Sample CP has a close thermal conductivity to the coarse grained Sample MM because of the changes in morphology of Y3Al5O12 phase from semi-connected (Sample MM) to isolated (Sample CP). Finally, specially designed fin-type Al2O3 ceramic heat sinks were successfully fabricated via the novel integrated process, which has been proven to be an effective method for fabricating complex-shaped Al2O3 ceramic components with enhanced flexural strength and reliability.
Publisher
Springer Science and Business Media LLC
Subject
Ceramics and Composites,Electronic, Optical and Magnetic Materials
Reference83 articles.
1. Ge R, Zhang Y, Liu YJ, et al. Effect of Gd2O3 addition on mechanical, thermal and shielding properties of Al2O3 ceramics. J Mater Sci: Mater Electron 2017, 28: 5898–5905.
2. Dong GC, Chen X, Zhang XJ, et al. Thermal fatigue behaviour of Al2O3-DBC substrates under high temperature cyclic loading. Solder Surf Mo Technol 2010, 22: 43–18.
3. Dos Santos WN, Paulin Filho PI, Taylor R. Effect of addition of niobium oxide on the thermal conductivity of alumina. J Eur Ceram Soc 1998, 18: 807–811.
4. Wu HD, Liu W, Lin LF, et al. Preparation of alumina-toughened zirconia via 3D printing and liquid precursor infiltration: Manipulation of the microstructure, the mechanical properties and the low temperature aging behavior. J Mater Sci 2019, 54: 7447–7459.
5. Baklouti S, Bouaziz J, Chartier T, et al. Binder burnout and evolution of the mechanical strength of dry-pressed ceramics containing poly(vinyl alcohol). J Eur Ceram Soc 2001, 21: 1087–1092.
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