第3期 韩红梅等高温对碳/′碳复合材料性能影响的研究 [7]周少荣,乔生儒,白世鸿C饣复合材料室温及高温断裂韧性的测试表征材料工程,1994(4):2831 孙文训,黄玉东,张志谦等C复合材料的界面演化规律材料研究学报200014(增刊):137140 Effect of H igh Tem pera ture on M echan ical Behav ior of 3D Bra ided C/C Com posites Han Hongmei L iHejun, L i Kezhi, Zhang Xiulian (Northwestern Po ly cal U niversity, Xi'an 710072) Abstract Three-dim ensional(3D)braided Carbon/Carbon(C/c)com po sites m ade by chem ical vapor infiltration (CV D) process, or 3D braided CV IC/C compo sites, have found w idesp read use in m ilitary aero space app lications But high-tem perature m echan ical p roperties cannot, to our best know ledge, be found in the open literature Subsection 2 I finds that the grap h itizatin heat treatm ent, as generally practiced in Ch inese research labo ratories, can imp rove the strength and modulus of 3D braided CV I-C/C com po sites under room tem perature v ia altering interface condit ons and m icro-crack distributon in the com po sites The test data given in Table I show that the m echan ical p roperties of 3D braided CV I-C/C com po sites are higher at a tem perature of 1 700C than tho se at room tem perature: higher by up to 45% for flexural strength and by up to 15% for flexural modulus of elasticity. The morpho logy of fracture surface, as can be seen from F ig 4, show s that, under high temperature, strong interface bond ing exists between fibers and m atrix, thus po inting out that fracture of 3D braided CV IC/C compo sites exh ibits brittle characterist ic Key words Carbon/Carbon (C/C)com po sites, chem ical vapor infiltration (CV D), high-temperature m echan ical behavor. in terface 201994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net[7 ] 周少荣, 乔生儒, 白世鸿. CöC 复合材料室温及高温断裂韧性的测试表征. 材料工程, 1994 (4): 28～ 31 [8 ] 孙文训, 黄玉东, 张志谦等. CöC 复合材料的界面演化规律. 材料研究学报. 2000, 14 (增刊): 137～ 140 Effect of H igh Temperature on M echan ical Behav ior of 3D Bra ided CöC Composites H an Hongm ei, L i H ejun, L i Kezh i, Zhang X iu lian (No rthw estern Po lytechnical U niversity, X i′an 710072) Abstract: Th ree2dim en sional ( 3D ) b raided CarbonöCarbon (CöC ) compo sites m ade by chem ical vapo r infiltration (CV I) p rocess, o r 3D b raided CV I2CöC compo sites, have found w idesp read u se in m ilitary aero space app lication s. Bu t h igh2temperatu re m echan ical p roperties canno t, to ou r best know ledge, be found in the open literatu re. Sub section 2. 1 finds that the graph itization heat treatm en t, as generally p racticed in Ch inese research labo rato ries, can imp rove the strength and modu lu s of 3D b raided CV I2CöC compo sites under room temperatu re via altering in terface condition s and m icro2crack distribu tion in the compo sites. The test data given in Tab le 1 show that the m echan ical p roperties of 3D b raided CV I2CöC compo sites are h igher at a temperatu re of 1 700℃ than tho se at room temperatu re: h igher by up to 45% fo r flexu ral strength and by up to 15% fo r flexu ral modu lu s of elasticity. The mo rpho logy of fractu re su rface, as can be seen from Fig. 4, show s that, under h igh temperatu re, strong in terface bonding ex ists betw een fibers and m atrix, thu s po in ting ou t that fractu re of 3D b raided CV I2CöC compo sites exh ib its b rittle characteristic. Key words: CarbonöCarbon (CöC ) compo sites, chem ical vapo r infiltration (CV I) , h igh2temperatu re m echan ical behavio r, in terface 第 3 期 韩红梅等: 高温对碳ö碳复合材料性能影响的研究 ·355·