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Microstructure refinement-homogenization and flexural strength improvement of Al2O3 ceramics fabricated by DLP-stereolithography integrated with chemical precipitation coating process
Journal of Advanced Ceramics ( IF 16.9 ) Pub Date : 2021-07-13 , DOI: 10.1007/s40145-021-0473-2
Guanglin Nie 1 , Yehua Li 1 , Pengfei Sheng 1 , Fei Zuo 1 , Haolin Wu 1 , Leiren Liu 1 , Xin Deng 1 , Shanghua Wu 1 , Yiwang Bao 2
Affiliation  

In 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.



中文翻译:

DLP立体光刻结合化学沉淀涂层工艺制备Al2O3陶瓷的显微组织细化-均质化和抗弯强度提高

在这项研究中,化学沉淀涂层 (CP) 工艺创造性地与基于 DLP 立体光刻的 3D 打印相结合,以细化和均匀化 3D 打印的 Al 2 O 3陶瓷的微观结构。基于这种新颖的方法,Al 2 O 3粉末涂覆有均匀的非晶Y 2 O 3层,发现涂覆的Al 2 O 3粉末使3D打印的Al 2 O 3陶瓷的微观结构更加均匀和精细,与 Al 2 O 3和 Y 2 O的常规机械混合 (MM) 相比3粉。样品CP中Al 2 O 3的晶粒尺寸分别比单片Al 2 O 3陶瓷和样品MM中的晶粒尺寸小64.44%和51.43% 。CP试样的最高抗弯强度为455.37±32.17 MPa,分别比MM试样和AL试样高14.85%和25.45%;在三种样品中,样品 CP 的威布尔模量最高,为 16.88。此外,由于Y 3 Al 5 O 12相的形态从半连接(样品MM)到孤立(样品CP)的变化,细晶粒样品CP 具有与粗晶粒样品MM 接近的热导率。最后,特别设计的鳍片式 Al 2O 3陶瓷散热器通过新型集成工艺成功制造,已被证明是制造复杂形状的Al 2 O 3陶瓷部件的有效方法,具有增强的抗弯强度和可靠性。

更新日期:2021-07-13
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