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  « Effect of trace alumina on mechanical, dielectric, »
March 3rd, 2021, 7:08am
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   Effect of trace alumina on mechanical, dielectric,
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   Author  Topic: Effect of trace alumina on mechanical, dielectric,  
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Effect of trace alumina on mechanical, dielectric,
« on: December 19th, 2020, 10:52am »

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Effect of trace alumina on mechanical, dielectric, and ablation properties of fused silica ceramicswww.hslabrasive.com

The effect of a small amount of alumina on the mechanical strength, thermal shock resistance, room temperature and high-temperature dielectric, and ultra-high temperature ablation properties of fused silica ceramics prepared by aqueous gelcasting was investigated. Alumina addition promoted the dissolution of silica during slurry preparation. Compared to a pure fused silica sample, the flexural strength and thermal shock residual strength of fused silica ceramics with 0.5 wt% alumina (sintered at 1250 C) reached 79.9 MPa and 82.0 MPa, showing increases of 19.3% and 19.9%, respectively. In addition, the ablation resistance increased. The mass loss rate and linear recession rate of fused silica ceramics with 0.5 wt% alumina were 0.018 g/s and 0.133 mm/s at 10 s and 0.026 g/s and 0.089 mm/s at 60 s ablation time, respectively. Importantly, the presence of alumina did not decrease the excellent room temperature and high-temperature dielectric properties of fused silica ceramics.HSL fused alumina
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