Effect of La2O3-MgO ratio on the microstructure and properties of Si3N4 ceramics fabricated via digital light processing

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-05 DOI:10.1016/j.ceramint.2024.10.045

Qingxuan Zhou , Yang Wang , Zhuoqun Han , Jia Liu , Jie Zhao , Wei Chu , Zhicheng Zhao , Jian Li , Zhiqiang Cheng , Ling Li , Futian Liu

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Abstract

Due to the low powder content characteristic of digital light processing in the preparation of ceramic green bodies, significant challenges arise in obtaining high-density, high-performance Si₃N₄ ceramic. Sintering aids exert a critical influence on the densification and properties of Si₃N₄ ceramics. To further improve the performance of 3D-printed Si₃N₄ ceramics, Si₃N₄ ceramics were fabricated using DLP technology combined with gas pressure sintering employing different ratios of La₂O₃-MgO as sintering aids. The ceramic slurries, microstructures, and ceramic performance were studied systematically. The results showed that increasing the proportion of· La₂O₃ powder enhanced the rheological and curing properties of Si₃N₄ ceramic slurries. Varying the La₂O₃-MgO ratio affected the composition of the liquid phase, leading to differences in the densification and grain growth of Si₃N₄ ceramics. The average grain size increased with higher ratios of La₂O₃-MgO, and reached a maximum value of 0.91 μm with a ratio of 9:1. With the increase of the La₂O₃-MgO ratio, the bulk density and shrinkage rate of the ceramics initially increased and then declined. In addition, the flexural strength and fracture toughness of the ceramics peaked at a ratio of 3:7 for La₂O₃-MgO, measuring 577 ± 16.28 MPa and 5.84 ± 0.17 MPa m^1/2, respectively. These results demonstrate that high-performance Si₃N₄ ceramics can be effectively prepared using DLP technology by adapting the ratio of sintering additives.

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La2O3-MgO 比率对通过数字光处理制造的 Si3N4 陶瓷微观结构和性能的影响

在制备陶瓷绿色体时，由于数字光处理具有粉末含量低的特点，因此在获得高密度、高性能 Si3N4 陶瓷方面面临着巨大挑战。烧结助剂对 Si3N4 陶瓷的致密化和性能有着至关重要的影响。为了进一步提高三维打印 Si3N4 陶瓷的性能，我们采用 DLP 技术结合气压烧结技术，使用不同比例的 La2O3-MgO 作为烧结助剂来制造 Si3N4 陶瓷。对陶瓷浆料、微观结构和陶瓷性能进行了系统研究。结果表明，增加 La2O3 粉末的比例可提高 Si3N4 陶瓷浆料的流变和固化性能。不同的 La2O3-MgO 比例会影响液相的组成，从而导致 Si3N4 陶瓷的致密化和晶粒生长出现差异。平均晶粒尺寸随着 La2O3-MgO 比例的增加而增大，在比例为 9:1 时达到最大值 0.91 μm。随着 La2O3-MgO 比例的增加，陶瓷的体积密度和收缩率先增加后下降。此外，陶瓷的抗弯强度和断裂韧性在 La2O3-MgO 比例为 3:7 时达到峰值，分别为 577 ± 16.28 兆帕和 5.84 ± 0.17 兆帕 m1/2。这些结果表明，通过调整烧结添加剂的比例，可以利用 DLP 技术有效制备高性能 Si3N4 陶瓷。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.