Correlations among processing parameters and porosity of a lightweight alumina. Issue 12 (15th August 2018)

• Record Type: Journal Article
• Authors: Fu, Lvping; Gu, Huazhi; Huang, Ao; Ni, Hongwei
• Is Part Of: Ceramics international. Volume 44:Issue 12(2018)
• Page Start: 14076
• Page End: 14081
• Publication Date: 2018-08-15
• Subjects: Processing parameters -- Porosity -- Lightweight alumina -- Analysis of variance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.05.005
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, lightweight alumina was fabricated using α-Al2 O3 micropowder as the raw material and corn starch as a pore-forming agent. Orthogonal experiments were designed to investigate the effect of particle size, pore-forming agent addition, and sintering temperature on the density and porosity of the lightweight alumina. The experimental results were analysed using a one-way analysis of variance and non-linear fitting, and the correlation between each processing parameter and property was discussed. The results indicate that the bulk density and total porosity of lightweight alumina are mainly affected by the pore-forming agent addition, while the sintering temperature is the main contributor to the apparent and closed porosity of the samples. Based on the Brook theory, dynamics analysis was performed on various samples. The difference in physical properties of various samples arose from differences in the relationship between grain boundaries and pore migration velocity. By adjusting the processing parameters, lightweight alumina with low bulk density, low apparent porosity, and high closed porosity could be obtained.