A simple and clean method to prepare SiC-containing vitreous ceramics for solar thermal storage in the clay-feldspar system
A simple and clean method to prepare SiC-containing vitreous ceramics for solar thermal storage in the clay-feldspar system
复制标题
一种简单清洁的粘土-长石体系太阳能蓄热用含SiC玻璃陶瓷的制备方法
DOI：
10.1016/j.jclepro.2019.119257
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发表时间：
2020-03-01
影响因子：
11.1
通讯作者：
Liu, Huan
中科院分区：
文献类型：
--
作者：
Lao, Xinbin;Xu, Xiaoyang;Liu, Huan
设计了一种简单、清洁的原位法制备SiC晶须增强微晶玻璃太阳能蓄热材料。采用埋碳烧结法在粘土-长石体系中原位合成SiC晶须，以改善玻璃陶瓷的热性能。研究了粘土-长石系含SiC微晶玻璃的合成机理和最佳工艺条件。结果表明，在K2 O-Al 2 O3-SiO2体系液相的覆盖下，通过气-固反应机制在陶瓷基体的孔隙内原位生成SiC晶须。直径为9-23 nm的SiC晶须将玻璃陶瓷的热膨胀系数从6.59 × 10（-6）℃-1显著降低到4.23 × 10（-6）℃-1（室温类似于1000 ℃）。同时，热导率增加到4.78W。（m.k）（-1），是原产品的2.6倍。发现增加的孔隙率通过为它们的生长提供空间来改善SiC晶须的量。SiC晶须的加入也提高了制品的力学性能，SiC含量最大的试样的抗弯强度最高，为75.7MPa。通过原位合成法引入SiC晶须，使玻璃陶瓷更适合于太阳能蓄热应用。原位法可以节省单独制备SiC晶须所需的能源和成本，并防止SiC晶须的吸入毒性。(C)2019爱思唯尔有限公司版权所有。
A simple and clean in-situ method was designed to prepare SiC whisker-reinforced vitreous ceramics for solar thermal storage. SiC whiskers were in-situ synthesized in the clay-feldspar system via a carbon-buried sintering process to improve the thermal properties of vitreous ceramics. The synthesis mechanism and the optimized processing procedure of SiC-containing vitreous ceramics from the clay-feldspar system were obtained. Results indicated that the in-situ SiC whiskers were synthesized inside the pores of vitreous ceramic matrix through the vapor-solid mechanism and covered by the liquid of K2O-Al2O3-SiO2 system. SiC whiskers with a diameter of 9-23 nm decreased the thermal expansion coefficients of the vitreous ceramics significantly from 6.59 x10(-6) degrees C-1 to 4.23 x 10(-6) degrees C-1 (room temperature similar to 1000 degrees C). Meanwhile, the thermal conductivity increases to 4.78W.(m.k)(-1), 2.6 times higher than that of the original products. The increased porosity was found to improve the amount of SiC whiskers by providing space for their growth. SiC whiskers also enhanced the mechanical properties of the products and the sample with the largest content of SiC exhibited the highest bending strength of 75.7 MPa. The introduction of SiC whiskers through the in-situ synthesis method makes vitreous ceramics more competent for solar thermal storage applications. The in-situ method can save the energy and costs needed for separately producing SiC whiskers and prevent the inhalation toxicity of SiC whiskers. (C) 2019 Elsevier Ltd. All rights reserved.