CAJ | 학술논문

在不同催化剂催化条件下，使用化学液相沉积工艺制备了密度约为1．65 g/cm3的C/C复合材料，并对其微观组织、弯曲性能和弯曲试样的断口形貌，分别用偏光显微镜、万能材料试验机和扫描电子显微镜进行了表征。结果表明，化学液相沉积过程中，催化剂的引入对材料的组织结构与弯曲性能有显著的影响。未添加催化剂时，生成了光滑层组织的热解碳，材料的断裂形式为脆性断裂；使用Fe作为催化剂时，生成了光滑层和粗糙层混合组织的热解碳，材料的弯曲强度和弯曲模量有一定程度提高，断裂形式为假塑性断裂；使用Ni作为催化剂时，在炭纤维外围生成了粗糙层和各向同性层的双层热解碳，其断裂形式为假塑性断裂，但弯曲强度与未催化试样差别较小；使用Ni＋Fe混合催化剂催化致密时，得到了粗糙层热解碳，其断裂形式为假塑性断裂，且弯曲强度和弯曲模量得到了明显提高。
재불동최화제최화조건하，사용화학액상침적공예제비료밀도약위1．65 g/cm3적C/C복합재료，병대기미관조직、만곡성능화만곡시양적단구형모，분별용편광현미경、만능재료시험궤화소묘전자현미경진행료표정。결과표명，화학액상침적과정중，최화제적인입대재료적조직결구여만곡성능유현저적영향。미첨가최화제시，생성료광활층조직적열해탄，재료적단렬형식위취성단렬；사용Fe작위최화제시，생성료광활층화조조층혼합조직적열해탄，재료적만곡강도화만곡모량유일정정도제고，단렬형식위가소성단렬；사용Ni작위최화제시，재탄섬유외위생성료조조층화각향동성층적쌍층열해탄，기단렬형식위가소성단렬，단만곡강도여미최화시양차별교소；사용Ni＋Fe혼합최화제최화치밀시，득도료조조층열해탄，기단렬형식위가소성단렬，차만곡강도화만곡모량득도료명현제고。
C/C composite was prepared by chemical liquid vapor deposition ( CLVD ) at different catalytic conditions and its density was about 1.65g/cm3.The microstructure and flexural properties of the composites were characterized.The results show that the use of catalyst has significant impact on the structure and flexural properties of C/C composites during CLVD . When there is no catalyst added in the precursor,smooth laminar( SL) pyrolytic carbon is formed and the fracture mode is brittle fracture. While Fe is used as catalyst, rough laminar (RL) and smooth laminar pyrolytic carbon structure is obtained.The flexural strength and flexurad modulas of the composites are improved and it shows pseudo plastic fracture.Rough laminar and isotropic (ISO) mixed structure is observed when Ni is added,and the composites show the pseudo plastic fracture behavior while the flexural strength is the same with the condition of nothing used as catalyst.The mixed Ni+Fe catalyst added in the precursor induces rough laminar pyrolytic carbon and the composites exhibit pseudo plastic fracture behavior, and their flexural strength and flexural modulus are improved signifi-cantly.