当前位置: X-MOL 学术Int. J. Appl. Ceram. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
SiC‐based porous ceramic carriers for heat‐conductive phase change materials through carbothermal reduction method
International Journal of Applied Ceramic Technology ( IF 2.1 ) Pub Date : 2020-10-02 , DOI: 10.1111/ijac.13639
Xiaoqian Liu 1 , Yang Zhou 1 , Xufeng Liu 1 , Runfeng Li 1, 2 , Shibo Li 1 , Cuiwei Li 1
Affiliation  

Iron tailings remain the environment‐damaging waste from the iron ore, and high porosity porous ceramics are an attractive material to “turn waste into treasure.” To improve the thermal conductivity, porous ceramics with high silicon carbide content have been prepared by carbothermal reduction sintering process using argillaceous fine‐grained iron tailings with high silica content. The carbothermal reduction reaction mechanism and the components and properties of samples in sintering process are investigated. The results show that reaction components in the tailings are mainly SiO2 and Fe2O3 and liquid phase is generated rapidly between 1200°C and 1300°C, producing foaming effect and significantly improving the porosity. Moreover carbothermal reduction of SiO2 occurs above 1300°C. After sintering at 1600°C for 2 hours, the apparent porosity and thermal conductivity of porous iron tailing ceramics are 81.1% and 0.58 W/(m·K), respectively. Compared with the ordinary porous iron tailing ceramics with the same porosity, the thermal conductivity of those herein is increased by 6.6 times. This study is instructive for the development of low‐cost preparation technology of phase change material carriers.

中文翻译:

碳热还原法用于导热相变材料的SiC基多孔陶瓷载体

铁尾矿仍然是铁矿石对环境造成破坏的废物,高孔隙率的多孔陶瓷是“将废物变成珍宝”的有吸引力的材料。为了提高热导率,使用碳硅含量高的泥质细粒铁尾矿,通过碳热还原烧结工艺制备了碳化硅含量高的多孔陶瓷。研究了碳热还原反应机理以及样品在烧结过程中的组成和性能。结果表明,尾矿中的反应组分主要为SiO 2和Fe 2 O 3,在1200°C至1300°C之间快速生成液相,起泡效果明显,孔隙率明显提高。SiO的碳热还原2发生在1300°C以上。在1600℃下烧结2小时后,多孔铁尾矿陶瓷的表观孔隙率和导热系数分别为81.1%和0.58 W /(m·K)。与具有相同孔隙率的普通多孔铁尾矿陶瓷相比,本文的热导率提高了6.6倍。该研究对相变材料载体低成本制备技术的发展具有指导意义。
更新日期:2020-12-10
down
wechat
bug