Modeling zirconia sintering trajectory for obtaining translucent submicronic ceramics for dental implant applications
Modeling zirconia sintering trajectory for obtaining translucent submicronic ceramics for dental implant applications
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DOI：
10.1016/j.actamat.2020.01.061
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发表时间：
2020-04-15
期刊：
影响因子：
9.4
通讯作者：
Olevsky, Eugene A.
中科院分区：
文献类型：
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作者：
Maniere, Charles;Lee, Geuntak;Olevsky, Eugene A.
实现高致密化而无晶粒生长是陶瓷材料烧结优化的主要目标之一。对于牙科种植体应用，实现这一目标对种植体的机械阻力、持续时间和透明度具有决定性影响。为了改善这些烧结结果，通常需要进行长期的实验探索性研究。在这项工作中，我们开发了一个相结合的实验/建模方法，允许快速识别的最佳烧结条件。通过实验确定了模型致密化和晶粒长大动力学本构参数。我们发现，烧结/晶粒生长动力学有一个有害的加速高于临界温度水平。无压烧结模型能够预测烧结应力，粉末致密化和晶粒生长已被用于确定的最佳烧结轨迹。我们利用两步烧结方法来接近临界温度而没有不期望的晶粒生长。我们得到了半透明的烧结试样，具有非常有限的晶粒生长。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Attaining high densification without grain growth is one of the main objectives of the sintering optimization in ceramic materials. For dental implant applications, achieving this objective has a decisive impact on the mechanical resistance, the duration and the translucency of the implant. To improve these sintering outcomes a long experimental explorative study is generally required. In this work, we developed a combined experimental/modeling approach allowing a rapid identification of the optimal sintering conditions. The determination of the model densification and grain growth kinetic constitutive parameters has been done experimentally. We found that the sintering/grain growth kinetics have a detrimental acceleration above a critical temperature level. The pressure-less sintering model able to predict the sintering stress, powder densification and grain growth has been used for the determination of the optimal sintering trajectory. We utilized the two step sintering method to approach the critical temperature without an undesirable grain growth. We obtained translucent sintered specimens with a very limited grain growth. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.