Effect of Si₃N₄-Y₂O₃ Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials

Abstract:

Fused quartz granules (d₅₀=19 μm) were used as raw material, and Si₃N₄-Y₂O₃ (1:1, in mass) was used as additive with dosages of 1%, 2% and 3% (in mass). Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h. The effect of Si₃N₄-Y₂O₃ on crystallization and sintering of the fused quartz ceramic materials were researched by measurements of apparent porosity, bending strength and thermal expansion rate (RT~1200 °C), and by the analyses of XRD and SEM. The results showed that the samples sintered at each temperature with 3% Si₃N₄-Y₂O₃ had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% Si₃N₄-Y₂O₃ was conducive to sintering of fused quartz ceramic materials. The results of XRD and thermal expansion rate showed that addition of 3% Si₃N₄-Y₂O₃ compound had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the Si3N4-Y2O3 compound plays the best role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.

• Periodical: Advanced Materials Research (Volumes 335-336)
• Pages: 713-716
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.335-336.713
• Online since: September 2011
• Authors: Shu Long Liu, Zhi Fa Wang, Jing Long Bu, Shu Bin Shen, Li Xue Yu
• Keywords: Crystallization, Fused Quartz, Silicon Nitride, Sintering, Ytterbium Oxide

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