The crack‐healing behavior and oxidation resistance of Al2O3–ZrO2–SiB6 ceramic at 600–1200°C

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2024-09-13 DOI:10.1111/ijac.14889

Haopeng Cai, Kun Jiang, Lihua Gao, Yinglong Wei

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Abstract

In this paper, we prepared Al2O3–ZrO2–SiB6 composite ceramics with excellent performance by introducing the second‐phase high‐strength healing agent SiB6 in zirconia‐toughened alumina system, artificially created cracks using Vickers hardness tester, investigated the effects of heat treatment temperature (600–1200°C) and time (0–300 min) on the microscopic morphology and bending strength of the ceramics, revealed the healing mechanism, and studied the oxidation resistance properties. It was found that the healing effect was better at heat treatment of 90 min at 700°C and 60 min at 800°C, and the flexural strength was restored to more than 95% of that of the smooth specimens in both cases. Crack repair was mainly achieved by the reaction of SiB6, ZrB2, and B4C with O2. Below 800°C, healing was mainly achieved by the reaction of SiB6 and B4C with O2, and the generated B2O3 and SiO2 migrated toward the crack to repair it. When the healing temperature is higher than 800°C, ZrB2 also reacts with oxygen to produce B2O3 and t‐ZrO2. It was found that the oxidation weight gain per unit area of the Al2O3–ZrO2–SiB6 ceramic composite at different temperatures was small, and it has excellent oxidation resistance.

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600-1200°C 下 Al2O3-ZrO2-SiB6 陶瓷的裂缝愈合行为和抗氧化性

本文通过在氧化锆增韧氧化铝体系中引入第二相高强度愈合剂SiB6，制备了性能优异的Al2O3-ZrO2-SiB6复合陶瓷，利用维氏硬度计人为制造裂纹，研究了热处理温度（600-1200℃）和时间（0-300min）对陶瓷微观形貌和抗折强度的影响，揭示了愈合机理，并研究了抗氧化性能。研究发现，在 700°C 热处理 90 分钟和 800°C 热处理 60 分钟时，修复效果较好，两种情况下的抗弯强度均恢复到光滑试样的 95% 以上。裂缝修复主要是通过 SiB6、ZrB2 和 B4C 与 O2 的反应实现的。低于 800°C 时，愈合主要是通过 SiB6 和 B4C 与 O2 的反应实现的，生成的 B2O3 和 SiO2 向裂纹迁移以修复裂纹。当愈合温度高于 800°C 时，ZrB2 也会与氧气发生反应，生成 B2O3 和 t-ZrO2。研究发现，Al2O3-ZrO2-SiB6 陶瓷复合材料在不同温度下的单位面积氧化增重很小，具有优异的抗氧化性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;