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首页> 外文期刊>Journal of Advanced Ceramics >Thermal expansion behavior, phase transitions and some physico-mechanical characteristics of fired doped rice husk silica refractory
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Thermal expansion behavior, phase transitions and some physico-mechanical characteristics of fired doped rice husk silica refractory

机译：焙烧掺杂的稻壳二氧化硅耐火材料的热膨胀行为，相变和一些物理力学特性

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摘要

This paper presents the findings on thermal expansion behavior of slaked lime doped rice husk silica (RHS) refractory monitored between 25 °C and 1500 °C. It also reports the phase transition analysis within the temperature range of 850-1450 °C. A sudden expansion of 0.7% noticed at 220 °C is due to the transformation of α-cristobalite to β-cristobalite. The highest expansion (0.85%) reached within the temperature range of 650-850 °C, remains almost constant for the investigated temperature range, and is not high enough to cause macro cracks in the refractory. The phase transition order is similar to those reported for quartzite refractory after 600 °C, though the crystallization temperature is lowered due to the presence of the dopant. Modulus of rupture, apparent porosity, bulk density, refractoriness and reheat change are reported and their results meet with the standards qualifying them for use in coke ovens.
机译：本文介绍了在25°C和1500°C之间监控的掺消石灰的稻壳二氧化硅（RHS）耐火材料的热膨胀行为的发现。它还报告了在850-1450°C的温度范围内的相变分析。在220°C时，突然膨胀了0.7％，这是由于α-方英石向β-方英石的转变。在650-850°C的温度范围内达到最高膨胀率（0.85％），在所研究的温度范围内几乎保持恒定，并且不够高，不会在耐火材料中引起宏观裂纹。尽管由于掺杂剂的存在降低了结晶温度，但相变顺序与600°C后石英岩耐火材料的相变顺序相似。报告了断裂模量，表观孔隙率，堆积密度，耐火度和再热变化，其结果符合将其用于焦炉的标准。

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