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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 83  2024
Effect of BPO4-B2O3 Composite Additive on Crystallization and Sintering of Silica Ceramics
Jialu Li,a Yuanbing Li,a, b, * Shujing Lia, b and Kun Xianga
Pages : 29-34 DOI : 10.1080/0371750X.2024.2282466
Abstract
BPO4-B2O3 composite additive enhanced silica ceramics were successfully prepared by solid phase sintering. The effects of BPO4-B2O3 addition and sintering temperature on the microstructure and phase composition and mechanical properties of silica ceramics were analysed by scanning electron microscopy and X-ray diffraction techniques. The results showed that at 1200o-1400oC, BPO4-B2O3 composite additive formed a glass phase in the sample, filled the pores, and improved the sintering densification of the sample. In addition, the addition of 9 wt% BPO4-B2O3 successfully inhibited the crystallization of fused silica, which significantly improved the mechanical strength of silica ceramics. After sintering at 1200oC for 3 h, the apparent porosity of silica ceramics with 9 wt% BPO4-B2O3 was only 1.33%, and the cold modulus of rupture reached a maximum of 60.99 MPa, which was about 35 times that of pure silica ceramics. It is shown that adding BPO4-B2O3 composite additive provides a feasible method for preparing silica ceramics with good mechanical properties.
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