Multi-response optimization on porosity and mechanical properties of alumina-based ceramic core

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-07-06 DOI:10.1016/j.powtec.2025.121358

Elahe Ayoubi , Mohsen Karimi , Mansoor Bozorg , Amir Mahdi Shabani , Salahoddin Isafi

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Abstract

Alumina-based ceramic cores were fabricated using a mixture of two commercial alumina powders, and zircon and magnesia as additives. The effect of zircon and magnesia content, particle size distribution, and sintering temperature on the bending strength and porosity of produced ceramic cores was investigated. Concurrent optimizing of bending strength and porosity was done using Taguchi's robust design and an L9 array. By assigning equal weights to bend strength and porosity, the optimal settings of the process parameters to achieve the optimal combinations of bending strength and porosity were obtained: Particle size distribution (30Wt%MR70–70Wt%MR42), magnesia (1.5Wt.%), zircon (25Wt.%) and sintering temperature (1400 °C). The analysis of the sample produced in optimal conditions showed good sintering shrinkage, low thermal expansion coefficient (so good shock resistance and dimensional stability), excellent ambient and high temperature bending strength values (91 and 100 MPa at ambient temperature and 1200 °C, respectively), and suitable porosity (∼30 %).

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铝基陶瓷芯孔隙率及力学性能的多响应优化

铝基陶瓷芯是用两种商业氧化铝粉末的混合物，锆英石和氧化镁作为添加剂制成的。研究了锆、镁含量、粒度分布、烧结温度等因素对陶瓷芯材抗弯强度和孔隙率的影响。采用田口稳健设计和L9阵列对材料的抗弯强度和孔隙率进行了并行优化。通过对抗弯强度和孔隙率赋予相同的权重，得到了实现抗弯强度和孔隙率最佳组合的工艺参数的最佳设置：粒度分布（30Wt% MR70-70Wt %MR42）、氧化镁（1.5Wt.%）、锆石（25Wt.%）和烧结温度（1400°C）。在最佳条件下生产的样品分析表明，良好的烧结收缩率，低热膨胀系数（因此具有良好的抗震性和尺寸稳定性），优异的环境和高温弯曲强度值（分别在环境温度和1200℃下为91和100 MPa），以及合适的孔隙率（~ 30%）。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.