PIP法制备孔径可调的有序多孔C/SiC复合材料  

Preparation of Pore Ordered and Size Controlled Porous C/SiC Composite through PIP Method

作　　者：高朋召[1] 李骏驰[1] 汪文祥[1] 吴明健[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2010年第10期63-66,共4页Journal of Hunan University:Natural Sciences

基　　金：中央高校基本科研业务费专项资金-青年教师科技创新扶持项目

摘　　要：通过对原生态木材进行可控炭化,得到了保留木材生物形态的多孔炭模板(BPC),用有机硅烷前驱体对此模板浸渍进而裂解(PIP),可制备出孔径有序且大小可调的多孔炭/碳化硅复合材料(BPC/SiC).采用XRD,SEM,氮表面吸附等方法研究了复合材料的微观结构、抗氧化和力学性能等.结果表明PIP裂解产物为微晶态SiC,与多孔炭模板内表面结合良好,使炭模板氧化起始温度及峰值温度均提高150℃;控制浸渍剂浓度和浸渍次数,可控制复合材料的孔径尺寸和形状;浸渍-热解5次循环时,复合材料径向抗压强度可达56.7 MPa,6次循环时,轴向抗压强度可达17.0 MPa.A pore ordered and size controlled porous C/SiC composite was prepared with dipped and controlled pyrolysis of polycabosilan（PIP） bio-porous carbon as the template derived from natural wood.The microstructure,anti-oxide property and mechanical properties of the composites obtained were characterized through XRD,SEM,BET,etc.The result showed that the phase of the SiC obtained was amporhous and combined well with the inner surface of BPC,which could raise the oxidation temperature of BPC by 150 ℃.With the increase of cycles times,the specific area of BPC/SiC decreased and the pores evaluated from rectangular to ellipse and finally to circle.The compressive strength of the composite first increased with the times of dip-pyrolysis cycle and then surrendered.A maximum axial compressive strength of 56.7 MPa occurred during 5 cycles,while 17.0 MPa of radical occurred during 6 cycles.

关 键 词：生物模板法 孔径可调 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]