Processing and properties of an all-oxide composite with a porous matrix
Processing and properties of an all-oxide composite with a porous matrix
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DOI：
10.1016/s0955-2219(99)00259-9
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发表时间：
2000-01-01
影响因子：
5.7
通讯作者：
Lange, FF
中科院分区：
文献类型：
--
作者：
Haslam, JJ;Berroth, KE;Lange, FF
本文介绍了一种具有多孔基体的全氧化物纤维复合材料的工艺和力学性能。全氧化物复合材料的加工方法被开发为简单的，包括一个烧结过程。该复合材料使用多孔基体而不是冒口涂层来偏转来自纤维的裂纹。使用涉及最近开发的用于再成形和形成饱和高体积分数（> 50体积%）颗粒体的方法的加工方法来形成复合材料。获得了编织纤维丝束的良好渗透。使用在纯HCl气体气氛中的烧结来生产在加工期间没有收缩的多孔基质。烧结过程还产生粗化，这使得微结构在使用期间稳定而不致密化，从而防止形成裂纹状空隙并保持足够的孔隙率用于裂纹偏转。复合材料的层间剪切强度和强度的测量表明，通过这种加工方法生产的复合材料与使用这里使用的氧化物纤维生产的以前的全氧化物材料相当。根据断裂面上的特征合理化了机械性能。断裂过程中允许能量耗散的基质的分解是明显的，并且与材料的断裂韧性的测量相关。中度切口不敏感性被证明，在切口存在下的净截面强度为无切口强度的700%。(C)2000爱思唯尔科技有限公司版权所有。
Processing and mechanical properties of an all-oxide fiber composite with a porous matrix are presented here. The processing approach for an all-oxide composite was developed to be simple and involve one sintering process. The composite uses a porous matrix instead of riser coatings to deflect cracks from the fibers. A processing method involving recently developed methods for reshaping and forming saturated high-volume fraction (> 50 vol%) particle bodies was used to form the composite. Good infiltration of the woven fiber tows was obtained. Sintering in a pure HCl gas atmosphere was used to produce a porous matrix without shrinkage during processing. The sintering process also produced coarsening which makes the microstructure stable against densification during use and thereby prevents forming cracklike voids and retains sufficient porosity for crack deflection. Measurements of interlaminar shear strength and strength of the composite show that composite produced by this processing method is comparable to previous all-oxide materials produced using the oxide fibers used here. The mechanical properties are rationalized in terms of the features on the Fracture surfaces. Disintegration of the matrix to allow energy dissipation during fracture was apparent and correlates with the measurements of the fracture toughness of the material. Moderate notch insensitivity was demonstrated with a net section strength in the presence of a notch being 700% of the unnotched strength. (C) 2000 Elsevier Science Ltd. All rights reserved.