砖砌结构Si3N4复合陶瓷的制备及其力学性能,Journal of the American Ceramic Society

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砖砌结构Si3N4复合陶瓷的制备及其力学性能
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2023-12-26 , DOI: 10.1111/jace.19641
Shihui Zhao ₁ , Yi Zhao ₁ , Qifan Zhang ₁ , Guolong Sang ₁ , Xiaoqing Xi ₁ , Jinlong Yang ₁

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砖状结构的珍珠母具有多种增韧强化机制，砖状结构的仿生陶瓷受到了许多研究人员的关注。然而，构建精确且均匀的微观结构的过程相当复杂。在此，我们提出了一种新颖的面部方法来制造砖混结构复合陶瓷。将颗粒稳定发泡、离心喷雾干燥制备的Si ₃ N ₄微球浸泡在悬浮液中并均匀包裹ZrO ₂后直接热压。通过调节烧结压力和ZrO ₂含量来优化复合陶瓷的力学性能。当ZrO ₂含量为10 wt%、烧结压力为5 MPa时,ZrO ₂ /Si ₃ N ₄砖砂复合陶瓷的断裂韧性达到9.02 MPa·m ^1/2 ,抗折强度为784 MPa,与对照组相比，分别增加了46.9%和26.5%。_{在保留优异抗弯强度的同时，强界面也会因ZrO 2}热膨胀系数不匹配而产生残余应力，导致裂纹沿砖砌结构两相界面偏转和分支。和Si ₃ N ₄，消耗更多的断裂能来达到增韧的效果。

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Preparation and mechanical behavior of Si3N4 composite ceramics with brick-and-mortar structure

The nacre with brick-and-mortar structure enables multiple toughening and strengthening mechanisms, and bioinspired ceramics with brick-and-mortar structure have been attracting much attention from many researchers. However, the process of constructing precise and uniform microstructure is quite complicated. Herein, we propose a novel and facial method to fabricate composite ceramics with brick-and-mortar structure. Si₃N₄ microspheres prepared by particle-stabilized foaming and centrifugal spray drying were directly hot pressed after being immersed in suspension and evenly wrapped with ZrO₂. The mechanical properties of composite ceramics were optimized by adjusting the pressure during sintering and ZrO₂ content. When ZrO₂ content was 10 wt% and sintering pressure was 5 MPa, the fracture toughness of ZrO₂/Si₃N₄ brick-and-mortar composite ceramics reached 9.02 MPa·m^1/2, and the flexural strength was 784 MPa, which were increased by 46.9% and 26.5%, respectively, compared with the control group. While retaining excellent flexural strength, the strong interface also induces crack to deflect and branch along the two-phase interface of the brick-and-mortar structure caused by the residual stress, which was derived from the mismatch of the thermal expansion coefficient of ZrO₂ and Si₃N₄, consuming more fracture energy to achieve the toughening effect.

更新日期：2023-12-26

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