Porous SiC-mullite ceramics with high flexural strength and gas permeability prepared from photovoltaic silicon waste. Issue 1 (January 2020)

• Record Type: Journal Article
• Authors: Xing, Zhiheng; Hu, Yuhang; Xiang, Daoping; Ma, Yanping
• Is Part Of: Ceramics international. Volume 46:Issue 1(2020)
• Page Start: 1236
• Page End: 1242
• Publication Date: 2020-01
• Subjects: Mullite -- Photovoltaic solid waste -- Porous SiC ceramic -- MoO3; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.09.052
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this paper, porous SiC-mullite ceramics (PSMCs) with high flexural strength and gas permeability were prepared with various mass fractions of MoO3 and Al2 O3 . Higher performance was achieved at low sintering temperatures and the problem of large amounts of cristobalite phase in the PSMCs was solved. The results show that 4 wt% MoO3 is optimal for the growth of mullite rods at a sintering temperature of 850 °C. Porosity was effectively controlled by the formation of interlocking structure and mechanical strength was not obviously affected. Therefore, the optimal content of Al2 O3 was 25 wt% in samples prepared at 850–1200 °C, as the flexural strength was generally higher than that in samples with other Al2 O3 contents. The highest flexural strength of 66.02 MPa was achieved at an open porosity of 45.4%, gas permeability of 2.32 × 10 −13 m 2, and permeance of 4.62 × 10 −5 mol m −2 s −1 Pa −1 in samples sintered at 1000 °C. This work is of significance for the industrial preparation of PSMCs from photovoltaic silicon waste.