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Vat Polymerization-Printed Partially Stabilized Zirconia: Mechanical Properties, Reliability and Structural defects.
Additive Manufacturing ( IF 11.0 ) Pub Date : 2020-07-12 , DOI: 10.1016/j.addma.2020.101450
Carli Marsico 1 , Marit Øilo 2 , Jeff Kutsch 3 , Mark Kauf 3 , Dwayne Arola 1, 4, 5, 6
Affiliation  

Additive manufacturing (AM) of ceramics, particularly of zirconia, is becoming of increasing interest due to the substantial freedom available in the design and fabrication process. However, due to the novelty of the field and the challenges associated with printing dense bulk ceramics suitable for structural applications, thorough investigations that explore the effects of printing on the mechanical performance are limited. Previous work has identified anisotropy in the mechanical properties and attributed it to the layer-by-layer deposition. However, substantiated fractographic evidence detailing the origins and effects of layer lines on the probability of failure are limited. This study investigates the mechanical properties of a dense (>99 %TD), partially stabilized zirconia fabricated by a digital light projection printing method following ASTM standards. Hardness and strength evaluations were conducted, followed by a Weibull analysis and fractography. The investigation entailed five unique build directions and a conventionally manufactured reference material that was used as a control. Although the strengths were comparable to the reference material for some orientations, fracture frequently initiated at layer lines and related defects in all orientations. The findings indicate that if the layer lines can be prevented or engineered, the strength of vat printed ceramics can be improved substantially.



中文翻译:

还原聚合印刷的部分稳定氧化锆:机械性能、可靠性和结构缺陷。

由于设计和制造过程中的巨大自由度,陶瓷,尤其是氧化锆的增材制造 (AM) 越来越受到关注。然而,由于该领域的新颖性以及与打印适合结构应用的致密块状陶瓷相关的挑战,探索打印对机械性能影响的深入研究是有限的。以前的工作已经确定了机械性能的各向异性,并将其归因于逐层沉积。然而,详细说明层线的起源和对失效概率的影响的经证实的断口证据是有限的。本研究调查了致密 (>99%TD) 的机械性能,部分稳定的氧化锆通过符合 ASTM 标准的数字光投影印刷方法制造。进行硬度和强度评估,然后进行威布尔分析和断口分析。调查涉及五个独特的构建方向和用作对照的常规制造参考材料。尽管在某些方向上强度与参考材料相当,但在所有方向上的层线和相关缺陷处经常发生断裂。研究结果表明,如果可以防止或设计分层线,则可以显着提高还原印刷陶瓷的强度。调查涉及五个独特的构建方向和用作对照的常规制造参考材料。尽管在某些方向上强度与参考材料相当,但在所有方向上的层线和相关缺陷处经常发生断裂。研究结果表明,如果可以防止或设计分层线,则可以显着提高还原印刷陶瓷的强度。调查涉及五个独特的构建方向和用作对照的常规制造参考材料。尽管在某些方向上强度与参考材料相当,但在所有方向上的层线和相关缺陷处经常发生断裂。研究结果表明,如果可以防止或设计分层线,则可以显着提高还原印刷陶瓷的强度。

更新日期:2020-07-12
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