Influence of Vacuum and Water on Fracture Behavior of Ceramic Precursor Type Fibers and AFM Observation of Surface Damage.
Influence of Vacuum and Water on Fracture Behavior of Ceramic Precursor Type Fibers and AFM Observation of Surface Damage.
复制标题
真空和水对陶瓷前体型纤维断裂行为的影响以及表面损伤的 AFM 观察。
DOI：
10.1299/kikaia.64.2964
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Komai
中科院分区：
文献类型：
--
作者：
K. Minoshima;Takatoshi Kano;K. Komai
本文描述了真空和水环境对三种不同类型陶瓷前驱体型纤维的拉伸断裂行为的影响：一种是氧化物陶瓷纤维，γ-Al2O3纤维，或Altex[〇！]由住友化学公司生产的R纤维，其他为SiC纤维，或Nicalon[〇！][R]由Nippon Carbon和Si-C-Ti-O纤维制成，或Tyranno[〇！][R]，由宇部工业。单纤维拉伸试验在空气、真空（Altex为2×10-4 Pa， Nicalon和Tyranno为4-5×10-3 Pa）和去离子水中进行。试验是在室温下进行的。纤维的纵向弹性模量与测试环境无关。不同纤维在真空中的强度最高，在空气中强度次之，在水中强度次之。纤维在水中的强度随位移速率的减小而减小：纤维强度随环境中含水量的增加而减小，随位移（应变）速率的减小而减小。高分辨率场发射型扫描电镜由于z方向分辨率不足，无法观察到纤维表面损伤导致纤维强度下降。与此相反，AFM具有纳米分辨率，可以识别出水和拉伸载荷协同作用造成的纤维表面损伤，并讨论了纤维的降解和断裂机制。
This paper describes the influence of vacuum and water environments on the tensile fracture behavior of three different types of ceramic precursor type fibers : one was an oxide ceramic fiber, γ-Al2O3 fiber, or Altex[○!R] fiber manufactured by Sumitomo Chemicals, and the others were SiC fiber, or Nicalon[○!R] by Nippon Carbon and Si-C-Ti-O fiber, or Tyranno[○!R], by Ube Industries. Single fiber tensile tests were conducted in air, in vacuum (2×10-4 Pa for Altex and 4-5×10-3 Pa for Nicalon and Tyranno), and in deionized water. The tests were conducted at room temperature. The longitudinal elastic modulus of the fibers were independent of testing environment. However, the fiber strength in vacuum was the highest, irrespective of fiber, and it decreased in the order of in air and in water. Moreover, the strength in water decreased with a decrease in displacement rate : the fiber strength decreased with increasing water content in an environment, and with decreasing displacement (strain) rate. The fiber surface damage that caused a decrease in fiber strength could not be observed by high-resolution, field emission type scanning electron microscopy, because the resolution in z-direction was insufficient. In contrast with this, the AFM has nanometric resolution, and the fiber surface damage caused by synergistic effects of water and tensile loading could be identified, and the degradation and fracture mechanisms of the fibers were discussed.