树脂浸渍法对炭炭复合材料力学性能的影响  

Effect of resin impregnation on the mechanical properties of C/C composites

作　　者：李晔[1] 黄启忠[1] 王林山[1] 

机构地区：[1]中南大学粉末冶金研究所,湖南长沙410083

出　　处：《新型炭材料》2003年第2期117-122,共6页New Carbon Materials

基　　金：国家重点工业性试验项目(计高技[1998]1817)

摘　　要：　将炭纤维坯体CVD增密至不同密度,再对其进行树脂浸渍。对自制样品与英国Dunlop公司和美国Ben dix公司产品的力学性能特征进行了对比分析。结果表明:自制样的抗压强度和抗弯强度远远高于国外样品,层间剪切强度也比国外样品高;自制样品在ρCVD不超过1.45g cm3的情况下,随样品中CVD炭含量的增加,样品的抗弯强度和层间剪切强度值都随之增大,抗弯模量在ρCVD为1.06g cm3时达到最大值。同时用扫描电镜(SEM)分析了这几组试样的弯曲与剪切断口,发现除纯浸渍的样品具有明显的脆性断裂特征外,其余材料都呈假塑性断裂,且强度较高,说明树脂由于炭化后产生的树脂炭与纤维粘结太强,不适合在样品增密的初始阶段作浸渍剂。impregnation was used to densify carbon fiber preforms after they had been densified by chemical vapor deposition (CVD). The characteristics of mechanical properties for self-fabricated composites was compared with products obtained from the British Dunlop company and the American Bendix company. The results show that the compressive strength and the flexure strength of the composites are far above those of the foreign products, the interlaminar shear strength is also higher. The flexure strength and the interlaminar shear strength of the composites increase with increasing CVD carbon in the composites when the CVD density of the composites is not more than 1.45 g/cm(3) and the flexure modulus exhibits a maximum at a CVD density of the composite of 1.06 g/cm(3). At the same time the fracture surface of the composites was studied using SEM. The results show that the fracture of the composites impregnated by resin only is brittle, while the fracture of the other composites is pseudo-ductile type with increased ultimate strength, which indicates that the resin is not appropriate for impregnating the performs in the initial process due to the strong bonding between resin carbon and the carbon fiber.

关 键 词：树脂浸渍法 炭/炭复合材料 力学性能 抗弯强度 层间剪切强度值 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ127.11[化学工程—无机化工]