Enhancing thermal conductivity of AlN ceramics via vat photopolymerization through refractive index coupling and oxygen fixation

IF 10.3 1区 工程技术 Q1 ENGINEERING, MANUFACTURING Additive manufacturing Pub Date : 2024-09-05 DOI:10.1016/j.addma.2024.104522
Maohang Zhang , Chen Zhao , Jiaming Bai , Zhaoyang Hu , Jiawei Cai , Zhirui Zhang , Mingli Qin , Xuanhui Qu , Baicheng Zhang
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Abstract

Despite the growing development of ceramic fabrication by vat photopolymerization (VP), major gaps remain in application. Particularly in the case of VP-printed aluminum nitride (AlN) ceramic, the thermal conductivity is still below 170 W·m−1·K−1, a critical benchmark for efficient heat dissipation. To address this challenge, here we prepared an AlN slurry with high curing thickness through RI coupling between liquid-solid phase, and took into account of the rheological property under high solid loading. Full dense AlN green bodies with solid loading up to 50 vol% were successfully printed. Aiming to to tackle the degradation of thermal conductivity issue caused by oxygen increment of AlN via VP, we systemically studied the form of oxygen in AlN preparation processes. Through the sintering optimization, the oxygen element from the hydrolysis of AlN surface was fixated in the sintering aid Y2O3. Eventually, without any special process control or additional treatment, the final sintered AlN ceramics prepared by the developed slurry present a full densification and the highest thermal conductivity (up to 187.9 W∙m−1∙K−1) of any known additive manufactured ceramics.
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通过折射率耦合和氧气固定,利用大桶光聚合提高氮化铝陶瓷的热导率
尽管大桶光聚合(VP)陶瓷制造技术日益发展,但在应用方面仍存在很大差距。尤其是 VP 印刷氮化铝(AlN)陶瓷,其热导率仍低于 170 W-m-1-K-1,而这正是高效散热的关键基准。为了应对这一挑战,我们通过液固相之间的 RI 耦合制备了具有高固化厚度的氮化铝浆料,并考虑了高固体负载下的流变特性。我们成功打印出了固含量高达 50 Vol% 的全致密 AlN 绿色体。为了解决氮化铝通过 VP 增加氧气导致热导率下降的问题,我们系统地研究了氮化铝制备过程中氧气的形式。通过烧结优化,AlN 表面水解产生的氧元素被固定在烧结助剂 Y2O3 中。最终,在没有任何特殊工艺控制或额外处理的情况下,由所开发的浆料制备的最终烧结 AlN 陶瓷呈现出完全致密化,其热导率(高达 187.9 W∙m-1∙K-1)也是所有已知添加剂制造陶瓷中最高的。
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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