致密化工艺对厚壁针刺C/C复合材料性能的影响  

Effect of densification methods on properties of thick-wall needled C/C composites

作　　者：李艳[1] 崔红[1,2] 王斌[2] 嵇阿琳[2] 郑蕊[2] 白侠[2] 

机构地区：[1]西北工业大学材料学院,西安710072 [2]西安航天复合材料研究所,西安710025

出　　处：《复合材料学报》2017年第10期2337-2343,共7页Acta Materiae Compositae Sinica

基　　金：国防基础科研项目(C0320110006)

摘　　要：采用化学气相渗透(CVI)+树脂浸渍碳化法(PIC)、CVI+沥青高压浸渍碳化法(HPIC)及HPIC工艺分别制备了IR-C/C、IP-C/C以及P-C/C三种厚壁针刺C/C复合材料,研究了三种材料的热力学性能及材料内部密度均匀性。结果表明,IP-C/C材料轴向拉伸强度为24.7 MPa,IR-C/C材料轴向压缩强度达到200 MPa,而P-C/C材料轴向拉伸强度仅为7.4 MPa,相比IR-C/C材料降低了53%,相比IP-C/C材料降低了70%。复合致密化工艺制备的材料具有较低的热膨胀系数,而P-C/C材料1000℃热膨胀系数达到了3.566×10-6℃-1,是IPC/C材料的2.5倍。IP-C/C材料和P-C/C材料采用高压碳化工艺增密,材料的致密度高,密度分布均匀,导热系数高。IR-C/C材料内部密度降为14.5%,密度分布为外高内低。以CVI+HPIC复合制备的材料综合性能优异,且内部密度分布均匀,适合于制备厚壁材料。Three kinds of thick-wall needled C/C composite, namely IR-C/C, IP-C/C, P-C/C respectively, were prepared by means of chemical vapor infiltration（CVI）and resin impregnation/carbonization（PIC）, CVI and pitch impregnation/high pressure carbonization （HPIC）, HPIC. The thermodynamic property and density uniformity were studied. The results indicated that, axial tensile strength of IP-C/C is 24.7 MPa, axial compressive strength of IR- C/C reaches to 200 MPa, while axial tensile strength of P-C/C is merely 7.4 MPa, which is 53% less than IR-C/C, and 70% less than IP-C/C. Material prepared by compound technology has lower thermal expansion coefficient, while the thermal expansion coefficient at 1000℃ of P-C/C is 3. 566 ×10^-6℃^-1 , which is 2.5 times than IP-C/C. IP-C/C and P-C/C are both prepared by high pressure carbonization, their densities are higher, density distribution are uniform, which make it own higher thermal conductivity coefficient. The density drop is 14.5% within the IR-C/ C, and showing high-low-high distribution across the wall. The needled C/C composites, made by the technology of CVI＋HPIC, has the excellent comprehensive performance and uniform distribution across the wall, all of these make it suitable for preparing the thick-wall composites.

关 键 词：针刺材料 致密化工艺 密度均匀性 热力学性能 复合工艺 

分 类 号：TB332[一般工业技术—材料科学与工程]