Influence of La₂O₃ Nanopowder on Crystallization Behavior and Sintering Performance of Fused Quartz Ceramic Materials

Abstract:

Fused quartz granule was used as raw material, and La2O3 nanopowder was used as additive with dosages of 1wt %, 2 wt % and 3 wt %. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h, respectively. The properties of samples including apparent porosity, bending strength and thermal expansion ratio were measured. The results show that the sample with 2 wt % La₂O₃ nanopowder has the lowest apparent porosity and the highest bending strength, and sample added 1% nano-La₂O₃ has the best inhibiting effect on crystallization of fused quartz. The samples with La₂O₃ nanopowder adding have lower thermal expansion ratio than blank sample. The XRD and SEM results show that the diffraction peak intensity of quartz phase decrease and the microstructure of the samples become more compact, after the La₂O₃ nanopowder was added into fused quartz ceramics. It indicated that La₂O₃ nanopowder has excellent inhibiting effect on crystallization of fused quartz and facilitating effect on sintering of fused quartz ceramics.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1074-1077
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1074
• Online since: December 2011
• Authors: Jing Long Bu, Yue Jun Chen, Jun Xing Chen, Li Xue Yu, Zhi Fa Wang
• Keywords: Crystallization, Dosage, Fused Quartz, La₂O₃ Nanopowder, Sintering

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