Effects of thermal and thermomechanical induced mechanical changes of C/C composites
Effects of thermal and thermomechanical induced mechanical changes of C/C composites
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C/C 复合材料的热和热机械引起的机械变化的影响
DOI：
10.1016/j.carbon.2010.04.040
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发表时间：
2010
期刊：
影响因子：
10.9
通讯作者：
G. Grathwohl
中科院分区：
文献类型：
--
作者：
L. Gaab;D. Koch;G. Grathwohl
碳纤维增强碳复合材料是通过纺织纤维预制件的改进的化学气相渗透（CVI）来生产的。被称为快速CVI（r-CVI）的改进工艺允许快速生产基质以及调整基质的石墨烯取向。在1200°C的处理温度下，产生大致以纤维取向的石墨烯堆叠。在不同温度下以及在温度处理和任选的表面硅化之后对C/C进行机械测试。热处理导致基质中石墨烯堆叠的生长和重新排列，从而导致复合材料的各向异性增强。在C/C上超过加工温度的高温测试导致石墨烯堆叠在加载方向上的机械诱导拉直。通过XRD测量证明的石墨烯结构的改进的取向导致更高的负载能力，并因此导致在0/90°纤维方向上更好的机械性能和在±70°纤维取向上降低的机械性能。当基质中的石墨烯层垂直于其取向加载时，这种效应也在横向拉伸测试中显示。此外，还提出了一种新的显微组织评价方法。
Carbon fiber reinforced carbon composites are produced by modified chemical vapor infiltration (CVI) of a textile fiber preform. The modified process called rapid CVI (r-CVI) allows a fast production of the matrix as well as the adjustment of graphene orientation of the matrix. At a processing temperature of 1200°C graphene stacks are produced which are oriented roughly in fiber orientation. Mechanical testing at different temperatures as well as after temperature treatment and optional surface siliconization was carried out on C/C. Thermal treatment leads to growth and realignment of the graphene stacks in the matrix resulting in an intensified anisotropy of the composite. High temperature tests beyond processing temperature on C/C lead to mechanically induced straightening of graphene stacks in loading direction. The improved orientation of the graphene structure which is proven by XRD measurements leads to higher loading capacity and therefore to better mechanical properties in 0/90° fiber direction and to reduced mechanical performance in ±70° fiber orientation. This effect is also shown in transverse tensile tests when the graphene layers in the matrix are loaded perpendicular to their orientation. Furthermore a new method to microstructural assessment is presented.
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DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
O. Paris;H. Peterlik
通讯作者：
H. Peterlik
流化床中沉积的热解碳的辐射引起的尺寸变化。
DOI：
--
发表时间：
1966
期刊：
影响因子：
--
作者：
J. Bokros;R. Price
通讯作者：
R. Price
碳/碳复合材料SiC涂层断裂韧性和热残余应力的微压痕法评价
DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
H. Hatta;Masayuki Mizoguchi;M. Koyama;Yuko Furukawa;T. Sugibayashi
通讯作者：
T. Sugibayashi
陶瓷纤维复合材料：机械性能的实验分析和建模
影响因子：
9.1
作者：
D. Koch;K. Tushtev;G. Grathwohl.
通讯作者：
G. Grathwohl.