材料科学
多孔性
焦炭
复合材料
煤焦油
发泡剂
热解
水银孔隙仪
热重分析
纹理(宇宙学)
煤
化学
冶金
有机化学
多孔介质
聚氨酯
图像(数学)
人工智能
计算机科学
作者
Juan José Fernández,Ana Figueiras,Marcos Granda,Jaime Bermejo,J.B. Parra,Rosa Menéndez
出处
期刊:Carbon
[Elsevier]
日期:1995-01-01
卷期号:33 (9): 1235-1245
被引量:27
标识
DOI:10.1016/0008-6223(95)00062-i
摘要
This study is concerned with the use of air-blowing to improve pitch properties as matrix precursor of carbon-carbon composites. Two commercial coal-tar pitches, an impregnating pitch and a binder pitch, and their air-blown products obtained at temperatures between 250 and 300 °C, were pyrolyzed in a horizontal tube furnace at 1000 °C. Cokes were characterized by light microscopy to monitor the influence of air-blowing on their optical texture. Density and porosity of cokes were determined by helium densimetry and mercury porosimetry, and their strength and reactivity by a microstrength test and thermogravimetric analysis, respectively. Results show that air-blowing of the impregnating pitch produces a decrease of the optical texture of coke, while in the case of the binder pitch there is an improvement of the microcrystalline structure. Moreover, air-blowing brings about a substantial increase in the density and strength of cokes, and a decrease in their porosity and reactivity.
科研通智能强力驱动
Strongly Powered by AbleSci AI