Preparation and characterization of continuous alumina based fiber reinforced with orientated mullite whisker
Preparation and characterization of continuous alumina based fiber reinforced with orientated mullite whisker
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DOI：
10.1016/j.cej.2014.12.101
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发表时间：
2015-05
影响因子：
15.1
通讯作者：
Haihong Zhang;Zhang Yaming;Bo Wang;Jianfeng Yang
中科院分区：
文献类型：
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作者：
Haihong Zhang;Zhang Yaming;Bo Wang;Jianfeng Yang
将单晶莫来石晶须直接添加到前驱体溶胶中，制备了定向晶须增强连续氧化铝基纤维基复合材料。在溶胶中加入莫来石晶须后，溶胶的固含量和可纺粘度范围增大，但Zeta电位降低。随着莫来石晶须含量的增加，Al齐聚物含量增加，单体和Al 13含量减少。在1250 °C下烧结后，所获得的致密纳米颗粒纤维被一致的轴向晶须增强，所述轴向晶须通过来自纺丝过程的轴向力而取向。莫来石晶须的存在不影响复合材料的相组成和致密结构，但可降低连续纺丝长度。虽然由于复合纤维的低致密化和裂纹，在高莫来石晶须含量下，单根复合纤维的拉伸强度降低，但是在莫来石晶须含量为1wt.%时，纤维断裂期间晶须桥接和拔出可能增加了强度642.6MPa。
Single crystal mullite whiskers were directly added into the precursor sols to synthesis the orientated whisker-reinforced continuous alumina based fibrous matrix composite. The solid content and spinnable viscosity range were enhanced but the zeta potential was reduced by the addition of the mullite whiskers into the sol. The Al oligomers content increased while monomer and Al13decreased with the increase of mullite whisker. After sintering at 1250 °C, the obtained compact nano grains fibers were reinforced with accordant axial direction whiskers which were orientated by the axial force derived from the spinning process. The phase composition and compact structure were not affected by the presence of the mullite whiskers, while the continuous spinning length became low. Although tensile strength of single composite fiber was decreased at a high mullite whisker content due to the low densification and cracks of composite fiber, whisker bridging and pullout during fiber fracture may have increased the strength at a mullite whisker content of 1 wt.% to 642.6 MPa.