The effect of MnO2 additive on the microstructure and mechanical properties of magnesium aluminate spinel

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

International Journal of Applied Ceramic Technology Pub Date : 2024-09-10 DOI:10.1111/ijac.14907

Guo‐rong Ji, Ming Feng, Huilan Hao, Yunfeng Gao, Baoshun Zhu, Yu‐ming Tian

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Abstract

In this study, varying amounts of MnO2 up to 5 wt.% were added to magnesium aluminate spinel (MA) bodies using a solid‐state sintering method at 1200–1600°C. The effect of MnO2 addition on the phase composition, microstructure, distribution of elements, and ionic valence of MA was investigated via X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray photoelectron spectroscopy, respectively. The results showed that Mg2+ ions in MA crystals were replaced by Mn2+ ions, resulting in the formation of the (Mg1‐xMnx)Al2O4 solid solution. The distorted crystal structures promoted the sintering reactions, and the mechanical characteristics of MA were greatly improved by the solid solution strengthening process. When the additive amount of MnO2 was 5 wt.% and the sintered temperature reached at 1600°C, excess manganese ions hardly dissolved into the lattice of MA. And these ions were only distributed at the grain boundaries of MgAl2O4, forming a “barrier” that hindered the migration and diffusion of particles, thereby suppressing the sintering process and weakening the mechanical strength of MA.

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MnO2 添加剂对铝酸镁尖晶石微观结构和力学性能的影响

在本研究中，采用固态烧结法在 1200-1600°C 下向铝酸镁尖晶石（MA）体中添加了不同量的 MnO2，最高达 5 wt.%。通过 X 射线衍射、扫描电子显微镜、能量色散光谱和 X 射线光电子能谱分别研究了 MnO2 的添加对尖晶石镁体的相组成、微观结构、元素分布和离子价的影响。结果表明，MA 晶体中的 Mg2+ 离子被 Mn2+ 离子取代，形成了 (Mg1-xMnx)Al2O4 固溶体。扭曲的晶体结构促进了烧结反应，固溶强化过程大大改善了 MA 的力学特性。当 MnO2 的添加量为 5 wt.%、烧结温度达到 1600°C 时，过量的锰离子很难溶解到 MA 的晶格中。这些离子只分布在 MgAl2O4 的晶界上，形成了阻碍颗粒迁移和扩散的 "屏障"，从而抑制了烧结过程，削弱了 MA 的机械强度。

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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;