化学液相沉积温度对C/C复合材料致密化行为及显微结构的影响
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摘要
化学液相沉积法(简称CLVD)是一种快速致密C/C复合材料的有效工艺.利用自行研制的沉积装置,以碳毡为预制体,研究了其在不同工艺下的致密化行为.并对复合材料的密度、孔隙率、致密化速率及显微形貌与结构进行了分析.结果表明:自行研制的沉积装置可实现C/C复合材料的快速制备,在1 050℃下经1h沉积后制备出密度近1.6g/cm~3的C/C复合材料,致密化效果显著.沉积的热解碳以碳纤维为轴形成同轴层状结构,沉积温度升高,致密化速率加快,热解碳由光滑层向粗糙层过渡,并向有序的石墨结构进行转化.
Chemical liquid vapor deposition is an effective way to densify C/C composite rapidly.Employing self-made deposition device and using carbon felt as prefabricator,the densification behavior of C/C composite was studied when various processing was used.The density,porosity,densification rate,micromorphology,and microstructure of the composite were analyzed.The result showed that the self-made deposition device could made rapid preparation of C/C composite come true,that the C/C composite with compactness of about 1.6 g/cm~3 would be prepared within 1 hour under 1 050℃and its densification effect was remarkable.The deposited pyrolytic carbon would form a laminar structure coaxial with carbon fiber as its axis.When the deposition temperature increased,the densification rate would accelerate,the structure of pyrolytic carbon would change from smooth layer into rough layer and change further into an orderly graphite structure.
Chemical liquid vapor deposition is an effective way to densify C/C composite rapidly.Employing self-made deposition device and using carbon felt as prefabricator,the densification behavior of C/C composite was studied when various processing was used.The density,porosity,densification rate,micromorphology,and microstructure of the composite were analyzed.The result showed that the self-made deposition device could made rapid preparation of C/C composite come true,that the C/C composite with compactness of about 1.6 g/cm~3 would be prepared within 1 hour under 1 050℃and its densification effect was remarkable.The deposited pyrolytic carbon would form a laminar structure coaxial with carbon fiber as its axis.When the deposition temperature increased,the densification rate would accelerate,the structure of pyrolytic carbon would change from smooth layer into rough layer and change further into an orderly graphite structure.
引文
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[12]张晓虎,马伯信,霍肖旭.化学液相热梯度致密C/C技术探索[J].宇航材料工艺,2002,32(3):22-26.
[13] ZHANG W G,HU Z J,H D··TTINGER K J.Chemical vapor infiltration of carbon fiber felt optimization of densification and carbon microstructure[J].Carbon,2002,40(14):2529-2545.
[14]黄启忠.高性能炭/炭复合材料的制备、结构与应用[M].长沙:中南大学出版社,2010.
[2]嵇阿琳,霍肖旭,马伯信.CLVD法制备炭毡/炭复合材料[J].新型炭材料,2002,17(1):41-44.
[3]李新涛,李克智,李贺军,等.CLVI工艺制备C/C复合材料研究进展[J].材料导报,2005,19(11):79-81.
[4]夏莉红,黄伯云,张福勤,等.C/C复合材料致密化工艺的研究进展[J].材料导报,2008,22(5):107-110.
[5] GOMES J R,SILVA O M,SILVA C M,et al.The effect of sliding speed and temperature on the tribological behaviour of carbon-carbon composites[J].Wear,2001,249(3/4):240-245.
[6]杨海峰.快速液相沉积致密化工艺碳前驱体环己烷的热裂解机理[D].西安:西北大学,2001.
[7]罗瑞盈.碳/碳复合材料制备工艺及研究现状[J].兵器材料科学与工程,1998,21(1):64-70.
[8] BRUNETON E,NARCY B,OBERLIN A.Carbon-carbon composites prepared by a rapid densification process I:Synthesis and physico-chemical data[J].Carbon,1997,35(10/11):1593-1598.
[9] DELHAES P,TRINQUECOSTE M,LINES J F,et al.Chemical vapor infiltration of C/C composites fast densification process and matrix characterizations[J].Carbon,2005,43(4):681-691.
[10]管映亭,金志浩.C/C复合材料致密化制备技术发展现状与前景[J].固体火箭技术,2003,26(1):59-63.
[11] VAIDYARAMAN S,LACKEY W J,AGRAWAL P K.Carbon/carbon processing by forced flow-thermal gradient chemical vapor infiltration(FCVI)using propane[J].Carbon,1996,34(3):347-362.
[12]张晓虎,马伯信,霍肖旭.化学液相热梯度致密C/C技术探索[J].宇航材料工艺,2002,32(3):22-26.
[13] ZHANG W G,HU Z J,H D··TTINGER K J.Chemical vapor infiltration of carbon fiber felt optimization of densification and carbon microstructure[J].Carbon,2002,40(14):2529-2545.
[14]黄启忠.高性能炭/炭复合材料的制备、结构与应用[M].长沙:中南大学出版社,2010.