Effect of B₄C-Yb₂O₃ Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials

Abstract:

Fused quartz granules (d₅₀=19 μm) were used as raw material, and B₄C-Yb₂O₃ (1:1, in mass) was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1250 °C, 1300 °C, 1350 °C and 1400 °C for 1 h. The apparent porosity, bending strength and thermal expansion ratios of the samples were examined and they were analysed by means of XRD and SEM. The results showed that the sample sintered at each temperature with 3% B₄C-Yb₂O₃ had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% B₄C-Yb₂O₃ was conducive to sintering of fused quartz ceramic materials. The results of XRD analysis and thermal expansion ratio analysis showed that 3% B₄C-Yb₂O₃ compound additive had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the 3% B₄C-Yb₂O₃ compound additive plays the excellent role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.

• Periodical: Advanced Materials Research (Volumes 291-294)
• Pages: 24-28
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.291-294.24
• Online since: July 2011
• Authors: Shu Bin Shen, Jing Long Bu, Li Xue Yu, Zhi Fa Wang, Rong Lin Wang, Rui Sheng Wang
• Keywords: Boron Carbide, Crystallization, Fused Quartz, Sintering, Ytterbium Oxide

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