Improved mechanical properties of 3YSZ ceramics prepared by pressure-less sintering assisted by cold sintering under mild conditions

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

Ceramics International Pub Date : 2024-09-21 DOI:10.1016/j.ceramint.2024.09.278

Rui Feng Ouyang , Xiao Li Su , Tao Zeng , Gang Dong , Yun Xia Chen , Lei Li

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引用次数: 0

Abstract

It is an effective method to prepare ZrO₂ ceramics by cold sintering (CS) and the subsequent pressure-less sintering (PLS), while the compacting problems are serious during the CS process with high pressure and high temperature, such as delamination, cracking and sticking to steel mold. To solve these problems, polyacrylic acid (PAA) is utilized as the organic binder, with the aid of which the 3 mol% yttrium-doped zirconia (3YSZ) nanopowder can be well compacted by CS under mild conditions (200 MPa, 100 °C). Compared to the conventional dry-pressed compacts, the particle agglomerations are observed in cold-sintered compacts as well as the slightly increased relative density, which lead to a significant improvement of Vickers Hardness (H_v) by 78 %. Consequently, the CS-PLS ceramics sintered at 1400 °C also exhibit a higher relative density (99.76 %) and better mechanical properties (H_v = 14.8 GPa, fracture toughness K_IC = 6.49 MPa m^1/2, flexural strength σ = 380.64 MPa) than the PLS ones without cold sintering, indicating that the CS-PLS process with mild conditions for CS is promising for preparing the denser and stronger YSZ ceramics.

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在温和条件下通过无压烧结辅助冷烧结制备的 3YSZ 陶瓷的机械性能得到改善

通过冷烧结（CS）和随后的无压烧结（PLS）制备 ZrO2 陶瓷是一种有效的方法，但在高压高温的 CS 过程中，压实问题十分严重，如分层、开裂和粘钢模等。为了解决这些问题，我们采用聚丙烯酸（PAA）作为有机粘合剂，借助这种粘合剂，3 mol% 掺钇氧化锆（3YSZ）纳米粉体可以在温和的条件下（200 兆帕、100 °C）通过 CS 得到良好的压制。与传统的干压压实物相比，冷烧结压实物中的颗粒团聚和相对密度略有增加，这使得维氏硬度（Hv）显著提高了 78%。因此，与未经冷烧结的 PLS 陶瓷相比，在 1400 °C 下烧结的 CS-PLS 陶瓷也表现出更高的相对密度（99.76 %）和更好的机械性能（Hv = 14.8 GPa、断裂韧性 KIC = 6.49 MPa m1/2、抗弯强度 σ = 380.64 MPa），这表明 CS-PLS 工艺在温和的 CS 条件下有望制备出密度更大、强度更高的 YSZ 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.