Enhancing the mechanical properties of Al2O3‐C refractory: Carbonized coconut shell as a substitution for graphite

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

International Journal of Applied Ceramic Technology Pub Date : 2024-08-22 DOI:10.1111/ijac.14895

Xuekun Tian, Zhenyi Zhao, Xusheng Liu, Chengliang Ma, Lei Liu, Xinhong Liu

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引用次数: 0

Abstract

At present, graphite is commonly used as the carbon source in Al2O3‐C refractory. However, graphite resources are limited and belong to the category of nonrenewable resources. Coconut shell is a biomass material with low cost, low impurity, and high reactivity, and also belongs to renewable resources. Therefore, the research for using coconut shell carbon as a substitution for graphite in Al2O3‐C refractory has great significance. In this work, the coconut shell was firstly carbonized at 200–1000°C in flowing argon, and the microstructure of the carbonized coconut shells was investigated. Then the carbonized coconut shell powder was introduced into Al2O3‐C refractory instead of graphite, and the effect of carbonized coconut shell on mechanical properties and microstructure evolution of materials was investigated. The results show that the carbonized coconut shell has porous structures, composed of amorphous carbon and disordered micro‐graphite with many defects, endowing its high reactivity. Compared with graphite, the carbonized coconut shell promotes the Si and Al to in situ formation of nonoxide ceramic whiskers (SiC, Al4C3, and AlN), which play a strengthening and toughening role in the materials. When graphite is replaced by 1 wt% carbonized coconut shell, the residual strength ratio of samples increased from 81.8% to 90.2%, and that of the hot modulus of rupture increased from 17.53 MPa to 18.47 MPa.

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提高 Al2O3-C 耐火材料的机械性能：用碳化椰壳替代石墨

目前，石墨通常用作 Al2O3-C 耐火材料的碳源。然而，石墨资源有限，属于不可再生资源。椰壳是一种生物质材料，具有成本低、杂质少、反应活性高等特点，也属于可再生资源。因此，在 Al2O3-C 耐火材料中使用椰壳碳替代石墨的研究具有重要意义。在这项工作中，首先在 200-1000°C 的流动氩气中对椰壳进行碳化，并研究了碳化椰壳的微观结构。然后将碳化椰壳粉代替石墨引入 Al2O3-C 耐火材料中，研究了碳化椰壳对材料力学性能和微观结构演变的影响。结果表明，碳化椰壳具有多孔结构，由无定形碳和无序的微石墨组成，缺陷较多，具有较高的反应活性。与石墨相比，碳化椰壳能促进 Si 和 Al 在原位形成非氧化物陶瓷晶须（SiC、Al4C3 和 AlN），对材料起到增强和增韧作用。用 1 wt% 的碳化椰壳替代石墨后，样品的残余强度比从 81.8% 提高到 90.2%，热断裂模量从 17.53 MPa 提高到 18.47 MPa。

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;