The Influence of Al₂O₃-AlN Compound Additive on the Crystallization Characteristics and Properties of Fused Quartz Ceramic Materials

Abstract:

Fused quartz granule (d50=10μm) was used as raw material, and Al₂O₃-AlN (1:1, in mass) was used as additive with dosages of 1 wt%, 2 wt% and 3 wt%. The crystallization characteristics of fused quartz ceramic fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1h has been investigated by thermal expansion ratio and XRD. The results showed that the crystallization characteristics were markedly improved by 1 wt% AI₂O₃-AIN compound additive. 1 wt% Al2O3-AIN had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. The apparent porosity, bending strength and SEM of the samples were also examined. The results showed that the samples with 1 wt% AI₂O₃-AIN had the lowest apparent porosity among the samples containing Al₂O₃-AlN, the highest bending strength, and the sample AA1 sintered at 1350°C had more compact microstructure, which indicated that 1 wt% Al₂O₃-AlN was conducive to sintering of fused quartz ceramic materials. It can be deduced that the 1 wt% Al₂O₃-AIN compound additive plays the excellent role on inhibiting crystallization and promoting sintering of fused quartz ceramic materials.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 824-827
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.824
• Online since: June 2012
• Authors: Shu Bin Shen, Jing Long Bu, Li Xue Yu, Jun Xing Chen, Zhi Fa Wang
• Keywords: Al₂O₃-AlN, Crystallization, Fused Quartz, Sintering, Thermal Expansion

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