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.
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