Advances in Materials Science and Engineering最新文献

Effect of Reinforcement Ratio and Particle Size on the Physical and Mechanical Performance of Epoxy Matrix Panels and Waste Wood from Iroko Chlorophora excelsa from Cameroon 加固比和粒度对环氧基质板材和喀麦隆红豆杉废木材物理和机械性能的影响

4区材料科学 Q2 Engineering

Advances in Materials Science and Engineering

Pub Date : 2024-04-23 DOI: 10.1155/2024/9915731

Claude Takoumbe, Joseph Zobo Mfomo, A. Biwôlé, Elvis Mbou Tiaya, Jean Aimé Mono, Prince Hermann Pokem Nguimjeu, Linus Ntsotsa Biwole

The use of local materials developed from natural reinforcements remains a major challenge for many researchers in the development of the industry and the fight against pollution. The wood industry generates large quantities of environmental waste, including Iroko wood. To give Iroko a second life, this study uses Iroko sawdust waste to make an epoxy matrix composite material. The composite was produced using a cold pressing technique based on moving the top and bottom plates to a thickness of 10 mm. On this basis, three particle sizes [t < 0.35[, [0.35–0.63[, and [0.63–1[ were used, as well as three reinforcement (R)/matrix (M) percentages of 50R/50M, 60R/40M, and 70R/30M, where R is the reinforcement percentage and M is the matrix percentage. The physical tests, apparent and real density, porosity, moisture content, water absorption rate, absorption and desorption kinetics, diffusion theory, and activation energy were determined by the gravimetric method. A three-point bending test was carried out in accordance with the ASTM D790 for mechanical tests. The results show that the addition of Iroko particles lightens the material by reducing its density. The hydrophilic nature of Iroko particles increases the absorption rate and porosity, with good diffusion capacity as the particle size and percentage increase. The material produced can be light and porous, with possible applications in thermal insulation. In terms of kinetics, Verma et al.’s model best correlates the experimental desorption points for the 3 isotherms, while Page’s model best correlates the water absorption points. The mechanical results show that Young’s modulus and stress at break decrease with an increase in the reinforcement percentage and particle size. The mechanical results can be used to define the material’s applications in construction and furniture. In accordance with the EN312 standard, the composites produced can be classified as type 2 lightweight materials, suitable for use in dry and damp areas.

使用从天然加固材料中开发出来的本地材料，仍然是许多研究人员在工业发展和防治污染方面面临的一项重大挑战。木材工业会产生大量的环境废物，包括伊洛科木材。为了让伊鲁科木获得第二次生命，本研究利用伊鲁科锯屑废料制作环氧基复合材料。该复合材料采用冷压技术生产，将上下板移动到 10 毫米的厚度。在此基础上，使用了三种粒度[t < 0.35[、[0.35-0.63[和[0.63-1[]]，以及 50R/50M、60R/40M 和 70R/30M 三种加固（R）/基体（M）百分比，其中 R 是加固百分比，M 是基体百分比。物理测试、表观密度和实际密度、孔隙率、含水量、吸水率、吸水和解吸动力学、扩散理论和活化能均采用重量法测定。根据 ASTM D790 机械测试标准进行了三点弯曲测试。结果表明，添加伊洛科颗粒后，材料的密度降低，重量减轻。随着颗粒大小和比例的增加，伊鲁科颗粒的亲水性提高了吸收率和孔隙率，并具有良好的扩散能力。生产出的材料既轻又多孔，可用于隔热。在动力学方面，Verma 等人的模型与 3 个等温线的实验解吸点相关性最好，而 Page 的模型与吸水点相关性最好。力学结果表明，杨氏模量和断裂应力随着加固百分比和颗粒尺寸的增加而减小。力学结果可用于确定该材料在建筑和家具中的应用。根据 EN312 标准，生产的复合材料可归类为第 2 类轻质材料，适用于干燥和潮湿地区。

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