摘要
以电煅煤和活性α-Al_2O_3微粉为主要原料,硅粉和铝粉为添加剂,在埋碳条件下经1200℃和1400℃焙烧处理后制备出电煅煤基高炉炭砖(以下简称炭砖)。在炭砖中添加超细微晶石墨,借助X射线衍射仪、场发射扫描电子显微镜、激光导热仪和压汞仪研究了超细微晶石墨的引入对炭砖物相组成、显微结构、导热性能及孔结构的影响,并与引入相同量鳞片石墨的试样作对比。结果表明:实验所用超细微晶石墨晶粒尺寸细小,并且呈现出薄片状结构,与电煅煤相比具有更高的反应活性。在炭砖中引入超细微晶石墨,促进了材料中碳化硅晶须的生成,提高了材料的耐压强度和导热系数,增大了材料中<1μm气孔的孔容积率。与添加相同含量鳞片石墨的试样相比,含超细微晶石墨试样的导热系数和平均孔径与其相当,耐压强度更优,在炭砖中具有很好的应用前景。
Electrically calcined anthracite based carbon blocks(hereinafter abbreviated to carbon blocks)were prepared by using anthracites,α-Al 2O 3,Si and Al as main raw materials and fired at 1200℃and 1400℃in coke bed.The effect of addition of ultrafine microcrystalline graphite on the phase composition,microstructure,thermal conductivity and micropore structure of carbon blocks was investigated with the method of XRD,SEM,laser thermal conductivity meter and mercury porosimetry.Same amount of graphite flake was also introduced into carbon blocks as a contrast.The result shows that ultrafine microcrystalline graphite consisted of very small particles and mainly presents as sheet-like structure,which has higher reactivity than anthracite.When incorporated into carbon blocks,ultrafine microcrystalline graphite accelerates the formation of SiC whiskers,thus the cold compressive strength and thermal conductivity is improved and<1μm pore volume ration of carbon blocks is increased.Compared to carbon blocks with same addition amount of graphite flake,the thermal conductivity and mean pore diameter of carbon blocks containing ultrafine microcrystalline graphite is about the same,but the cold compressive strength is better,indicating that ultrafine microcrystalline graphite has promising application prospects in carbon blocks.
作者
王同生
李亚伟
桑绍柏
徐义彪
张志韧
姜美平
WANG Tong-sheng;LI Ya-wei;SANG Shao-bai;XU Yi-biao;ZHANG Zhi-ren;JIANG Mei-ping(The State Key Laboratory of Refractories and Metallurgy,Wuhan University and Technology,Wuhan 430081,China;National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan 430081,China;Hunan Wuke Graphene New Materials Co.,Ltd.,Changsha 410000,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第1期138-142,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金面上项目(51574186)
关键词
超细微晶石墨
显微结构
导热系数
高炉炭砖
ultrafine microcrystalline graphite
microstructure
thermal conductivity
carbon block
