SiO_(2)造孔法制备高强度硬碳泡沫的结构与性能  

Structure and Properties of High-Strength Hard Carbon Foams Prepared by SiO_(2) Porosity-based Method

作　　者：何玉鑫 贾建刚[1,2] 刘第强 高康博 臧树俊[1] HE Yuxin;JIA Jiangang;LIU Diqiang;GAO Kangbo;ZANG Shujun(School of Materials Science and Engineering,Lanzhou University of Science and Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals,Lanzhou University of Science and Technology,Lanzhou,China;DongFang Electric Co.,Ltd.,Tianjin 300480,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [3]东方电气(天津)风电叶片工程有限公司,天津300480

出　　处：《西安工业大学学报》2024年第4期432-440,共9页Journal of Xi’an Technological University

基　　金：国家自然科学基金项目(52162005)。

摘　　要：由于原料和制备工艺限制,酚醛树脂衍生的碳泡沫强度较低,从而限制了应用。本文以酚醛树脂为碳源,以SiO_(2)粉末为造孔剂,通过模板造孔法制备出一系列孔隙率不同的高强度碳泡沫,研究了不同比例的SiO_(2)对碳泡沫的微观结构、力学性能和导热性能的影响。研究结果表明:随着SiO_(2)含量增加,碳泡沫的孔隙率增加,体积密度降低。抗压强度随密度降低而降低,当树脂与SiO_(2)比例为3∶1时,抗压强度最高为79.7 MPa。当两者比例从3∶1变到1∶2时,碳泡沫的密度从0.691 g·cm^(-3)降到0.287 g·cm^(-3),抗压强度从79.7 MPa下降到23.8 MPa。其中,密度为0.287 g·cm^(-3)的碳泡沫具有较低的热导率(0.223 W·m^(-1)·K^(-1)),有望成为一种高(比)强度轻质隔热材料。Due to the limitations of raw materials and preparation processes,the strength of phenolic resin-derived carbon foams is very low,which limits their applications.In this paper,a series of high-strength carbon foams with different porosities were prepared by template porosimetry with phenolic resin as the carbon source and SiO_(2)powder as the porosimetry agent,and the effects of different contents of SiO_(2)on their microstructure,mechanical properties,and thermal conductivity were investigated.The results show that with the increase in SiO_(2)content,the porosity of carbon foams increases and the bulk density decreases.The compressive strength decreases as the density decreases,and the highest compressive strength is 79.7 MPa when the ratio of resin to SiO_(2)is 3:1.When the ratio changes from 3∶1 to 1∶2,the density of the carbon foam declines from 0.691 g·cm^(-3)to 0.287 g·cm^(-3),and the compressive strength decreases from 79.7 MPa to 23.8 MPa.And carbon foam with a density of 0.287 g·cm^(-3)has a lower thermal conductivity(0.223 W·m^(-1)·K^(-1)),which is expected to be a high(specific)strength lightweight thermal insulation material.

关 键 词：碳泡沫 微观结构 力学性能 热导率 

分 类 号：TB34[一般工业技术—材料科学与工程]